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Coefficients of Friction for Steel - The Physics Factboo

Materials and Material Combinations: Coefficient of Friction: Clean: Lubricated: Steel: 0.74: 0.16: Copper-lead alloy: .22-Phosphor-bronze: .35-Aluminum-bronz The coefficient of friction is required in calculating tightening torques and resulting bolt tensile forces and stress and in calculating the resulting friction between the connected surfaces. Below are provided a small number of values showing approximate values of friction coefficients to be used for steel screw fastened connections

Coefficient of Friction Engineering Librar

Static Friction Coefficients. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion. It should be noted that there can be significant differences between static friction (typically higher) and kinetic (sliding) friction Friction coefficient table of solid lubricants, metals, plastics and anti-friction materials Friction coefficient table for various material pairs in atmosphere and vacuum (see the definition of friction coefficient) is shown below. The data was collected from various sources [1,2,3]. Material C. Static friction is friction between two or more solid objects that are not moving relative to each other. For example, static friction can prevent an object from sliding down a sloped surface. The coefficient of static friction, typically denoted as μ s, is usually higher than the coefficient of kinetic friction

Friction coefficients for steel to steel contact surfaces

  1. Coefficient of friction (COF) is a dimensionless number that is defined as the ratio between friction force and normal force (Eqn (2.1)).Materials with COF smaller than 0.1 are considered lubricous materials. COF depends on the nature of the materials and surface roughness
  2. The static and kinetic friction coefficient values reference table shown in this article will be helpful for finding the COF values of commonly used materials. Static and Kinetic coefficient of friction . Fig.1: Showing the Concept of Coefficient of Friction . Image Source: Wik
  3. The coefficient of friction depends on the materials used; for example, ice on steel has a low coefficient of friction, while rubber on pavement has a high coefficient of friction. Coefficients of friction range from near zero to greater than one
  4. coefficients. Example - Friction Force The friction force of a 100 lb wooden crate pushed across a concrete floor with friction coefficient of 0.62 can be calculated as: Ff = 0.62 (100 lb) = 62 (lb) 1 lb = 0.4536 kg Example - Car Stopping Distance A car with mass 2000 kg drives with speed 100 km/h on a wet road with friction coefficient 0.2
Lined Pipes and Pressure Drop

It is recommended that the coefficient of static friction for concrete cast on steel plate and grout cast below steel plate should be taken as 0.65 for a wet interface with normal compressive stress levels between 20 and 100 psi (0.14 and 0.6 MPa). For dry interface, the coefficient of static friction should be taken as 0.57 Friction Factor Calculations The Darcy-Weisbach equation, for calculating the friction loss in a pipe, uses a dimensionless value known as the friction factor (also known as the Darcy-Weisbach friction factor or the Moody friction factor) and it is four times larger than the Fanning friction factor Friction and Friction Coefficients - The friction theory and friction coefficients at different conditions for various of materials like ice, aluminum, steel, graphite and other common materials and materials combinations; Fuel Consumption - Calculate liter/km - Estimate fuel consumption in liter per km - consumption chart and calculato COEFFICIENT OF FRICTION: The following friction coefficients shall be considered in calculating the sliding friction forces : Concrete to Soil / Rock: 0.30: Concrete to Steel : 0.45: Steel to Steel : 0.30: Steel to Teflon Plate: 0.10 : Brick Masonry on moist clay: 0.33: Brick Masonry on dry clay: 0.50: Brick Masonry on sand: 0.40. Coefficient of Friction Definition For instance, if the contact between two steel substrates results in a friction force, then energy loss due to friction will be high. Depending on the normal force, this could also result in a higher coefficient of friction

Hello, we provide concise yet detailed articles on Steel Choices: Coefficient Of Friction Steel On Steel Lubricated topic. The information here is sourced well and enriched with great visual photo and video illustrations. When you find the article helpful, feel free to share it with your friends or colleagues The friction coefficient depend on several factors: contact pressure, surface roughness, temperature, sliding velocity, type of lubricant and level of contamination. Static coefficients of friction are higher than the dynamic or kinetic values RE: Coefficient of friction for steel base plate to concrete BridgeSmith (Structural) 14 Nov 18 17:26 For our installations with leveling nuts (which is all of our overhead sign structures and high mast light towers), we keep the distance from the bottom of the leveling nut to the concrete less than the bolt diameter and ignore bending, per the AASHTO bridge design spec Although the coefficient of friction is usually specified for material pairs, there are other factors that are involved such as temperature, velocity, atmosphere, shape, etc. Thermoplastics such as nylon, HDPE and PTFE are often used for low friction bearings as their coefficient of friction declines with increasing loads

This coefficient of rolling resistance is generally much smaller than the coefficient of sliding friction. [1] Any coasting wheeled vehicle will gradually slow down due to rolling resistance including that of the bearings, but a train car with steel wheels running on steel rails will roll farther than a bus of the same mass with rubber tires running on tarmac POLYURETHANE COEFFICIENT OF FRICTION Surface = Polished Steel DUROMETER (HARDNESS) Friction Coefficient WET DRY 70A 0.26 0.71 75A 0.25 0.66 85A 0.28 0.77 90A 0.26 0.70 95A 0.29 0.68 55D 0.27 0.60 Table 1 Polyurethane Coefficient of Friction on Polished Steel 7. How is Coefficient of Friction Measured? 8 The coefficient of friction is a dimensionless scalar value which describes the ratio of the force of friction between two bodies. The coefficient of friction of the film surface depends on the adhesive property (surface tension and crystallinity), application of additives (slip additive, pigment, etc.), and surface polishing condition Experiments were performed to determine the coefficient of friction between concrete and steel. The nominal normal stress varied from 1 P.S.I. to 68,000 P.S.I. The coefficient of friction was found to be nearly constant with an average value of 0.47 Friction between elements. There may be a requirement to know the coefficient of friction between elements in contact, for example precast units resting on a concrete corbel or structural steel members on a concrete support. Values are not included in design codes such as BS 8110 (now withdrawn) and Eurocode 2

Title Author €Ö¬ Subject Keywords: ¼ø Created Date: T The coefficient of friction is strictly related to the two surfaces in contact and depends on many variables including the bulk material properties, the surface roughness, atmospheric dust, presence of oxide or other films on the surface, temperature, humidity and degree of contamination, amongst others [4] The coefficient of friction when large R-roller chain rotates on rails (rail material: steel) is shown in Table 2.4. Table 2.3 Friction Coefficients for Top Plate and Guide Rails Friction Coefficient The coefficient of friction is sensitive to contact pressure (unlike, for example, steel on steel, for which it is essentially independent of contact pressure), and increases at low pressure. It increases as sliding speed increases, although, within the range of sliding speeds expected in a non-seismic application, the sensitivity is not great The Friction coefficient, definition, formula,static friction, kinetic friction, Coefficient of Friction, table different materials, wood,steel,rubber,ic

Coefficient for Static Friction of Steel Char

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  2. Friction coefficient and wear rate of different steel materials are investigated and compared in this study. In order to do so, a pin on disc apparatus is designed and fabricated
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Coefficients Of Friction - Roy Mec

Reducing the friction coefficient . Achieving as low a friction coefficient as possible is advantageous when it comes to preventing wear, since this is associated with a higher abrasion resistance of the material. In order to reduce the friction coefficient of stainless steel and, at the same time, increase the wear resistance, stainless steel. Determining the Coefficient of Friction - Succeed in Physical Science materials have a very low coefficient of friction. Coefficient of Friction Surfaces Static Friction Kinetic Friction Steel on steel (dry) 0.6 0.4 Steel on steel (greasy) 0.1 0.05 Teflon on steel 0.041 0.04 Brake lining on cast iron 0.4 0.3 Rubber tires on dry pavement 0.9 0. Friction coefficient and wear volume as a function of sliding distance in uniaxial Kevlar 49-epoxy composite sliding against 52100 steel (three different orientation of the fiber) Graphs removed for copyright reasons. See Figure 6.10 in [Suh 1986]. 2

Friction Coefficient Tests of 416 Stainless Steel on Cartridge Brass by Dick Hatfield 1/30/04. Test Objective and Geometry. The objective of this test series was to measure the Friction Coefficient or Coefficient of Friction between 416 Stainless Steel and Cartridge Brass for various surface finishes on the Stainless Steel Coefficient of Friction Values for Greased Surfaces: Engineering laboratories have measured the coefficient of friction for a number of materials that are lubricated by grease and have tabulated the results. These coefficient of friction values apply only to sliding hard surfaces against each other Of course increasing surface roughness lead to increase the Coefficient of friction and also the value of surface roughness depended on field of applications for steel pair at dry friction A coefficient of friction is a value that shows the relationship between two objects and the normal reaction between the objects that are involved. It is a value that is sometimes used in physics to find an object's normal force or frictional force when other methods are unavailable.. The coefficient of friction is shown by =.In that equation, is the frictional force, is the coefficient of. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion. It should be noted that there can be significant differences between static friction (typically higher) and kinetic (sliding) friction

The friction coefficient of brake pads is divided into different levels. These levels are as follows:-EE class 0.25-0.35: This friction coefficient level is ideal for American and European cars. These brake pads are large and have a low friction coefficient Table Data Material Angle,(θ) Time, (s) Acceleration, (a) Static Friction Coefficient, μs Kinetic Friction Coefficient, μ k Block Slider Stainless Steel Zinc 25 1.34 0.512 0.466 0.408 Stainless Steel Aluminium 25 0.88 1.188 0.466 0.332 Plastic Zinc 30 0.97 0.977 0.577 0.462 Plastic Aluminium 30 1.32 0.528 0.577 0.515 Aluminiu m Zinc 25 1.43 0.449 0.466 0.415 Aluminiu m Mild Steel 25 1.13 0. DESIGN COEFFICIENT TABLES Hazen-Williams Friction Factor (C) Pipe Material Values for C Range High/Low Average Value Typical Design Value Plastic, PVC, Polyethylene pipe or tubing 160/150 150-155 150 Cement or mastic lined iron or steel pipe 160/130 148 140 Copper, brass, lead, tin or glass pipe or tubing 150/120 140 13

Relative roughness and friction factors for new, clean pipes for flow of 60°F (15.6°C) water (Hydraulic Institute Engineering Data Book, Reference 5) (1 meter 39.37 in = 3.28 ft). Where: f = friction factor D = Diameter (inches) ∈/ D = Relative Roughnes The coefficient of friction is incorporated in the static calculation 1:1. It is therefore necessary to determine the friction coefficients on site and verify them. The coefficient of friction, also called friction values (formula symbol μ), is a dimensionless measure of the frictional force in relation to the pressure force between two objects I work for a steel structure constructor. We are currently trying to improve our loading method on train and the main idea of the project is to find a material who can provide a high coefficient of friction with steel. For now, we are using hardwood block with a COF of 0.2 Friction is a force which holds back the movement of a sliding object. We can find friction everywhere in our surroundings. This force acts in the opposite direction to the way an object wants to slide. Besides, the coefficient of friction is a very important term here 344 coefficient friction plastic steel products are offered for sale by suppliers on Alibaba.com, of which machining accounts for 1%. A wide variety of coefficient friction plastic steel options are available to you, such as cutting. There are 21 suppliers who sells coefficient friction plastic steel on Alibaba.com, mainly located in Asia

Coefficients Of Friction

In this case, the friction coefficient would be .4. Note that the COF is a dimensionless number. Experience tells us that if we replace the wooden block with a 5 kg rubber block, it will take a greater force to drag the rubber block (say, 6 kgs force). The measured coefficient of friction (rubber/steel) would be 1.2 In the case of the PTFE sliding bearing, the coefficient of friction being considered is that between PTFE and polished stainless steel. Here again, a mistake is often made asking what the coefficient of friction of PTFE is. There is no such thing as a stand-alone value for coefficient of friction for any material Coefficient of Sliding Friction. by Ron Kurtus (17 July 2019) The coefficient of sliding friction is a number that indicates how much sliding friction there is between two object for a given normal force pushing them together.. There are two coefficients of sliding friction, depending on whether the objects are static or stationary of if they are kinetic or moving with respect to each other Friction is All Around Us. Whenever two objects in contact move against each other, friction is involved—sometimes more, sometimes less. For example, to make ball bearings work effectively, the coefficient of friction, often symbolized by the Greek letter μ, must be as low as possible, typically 0,0015. A CoF of 0,005 - 0,03 is what makes ice skaters slide over a frozen lake Static friction is a force that must be overcome for something to get going. The force of static friction increases with the applied force acting in the opposite direction, until it reaches a maximum value and the object just begins to move. After that, the object experiences kinetic friction

Coefficient of Friction Tester HZ-1007 is designed for static and kinetic coefficient of friction tests of plastic films, sheets, rubber, paper, PP woven bags, fabric style, etc. With the material smoothness testing, users can control and adjust material quality technical indexes to meet application demands Alibaba.com offers 608 friction coefficient steel products. About 2% of these are steel pipes, 1% are machining. A wide variety of friction coefficient steel options are available to you, such as aisi, astm, and jis

Supporting: 3, Mentioning: 50 - Friction Coefficient of Steel on Concrete or Grout - B. G. Rabbat, H. G. Russel Calculate the coefficient of friction. Calculate the coefficient of friction using the normal force and net horizontal force. FAQ. What is a coefficient of friction? A coefficient of friction is a term in physics use to describe the resistant force acting on an object due to it's normal force and the two surfaces that are in contact The force of kinetic friction is otherwise known as sliding friction, and it describes the resistance to motion caused by the interaction between an object and the surface it's moving on. You can calculate the kinetic friction force based on the specific coefficient of friction and the normal force friction coefficient is 0.27 and after that it incr eases very steadily up to 0.35. Over a duration of 22 minutes, friction coefficient becomes steady and for the rest of the experimental time it remains constant. Friction is low at the early stage of rubbing because of a layer of foreign material on copper disc D2534 Test Method for Coefficient of Kinetic Friction for Wax Coatings. D2714 Test Method for Calibration and Operation of the Falex Block-on-Ring Friction and Wear Testing Machine. D3108/D3108M Test Method for Coefficient of Friction, Yarn to Solid Material. D3412/D3412M Test Method for Coefficient of Friction, Yarn to Yar

L = friction factor (a number without dimension) p = density of water in kg/m3; V = flow rate in m/s; D = pipe diameter in m; L = pipe length in m; The expression above shows that calculations of pressure losses rest entirely on the determination of the coefficient L Mean Coefficient of Friction 0.145 0.145 0.138 Mean - 3σ .125 0.129 0.122 Mean + 3σ .165 0.160 0.155 Figure 7 Friction coefficient result summary. Test Articles/ Ra Static Coefficient of Friction Steel-on-steel,a=0.16S prn 0.14S Steel-on-Nitrided Steel, Ra=0.344 0.14S Steel-on-Superfinished Nitrided Steel, Ra= 0.065 0.13 Coefficient of friction between Steel on Steel, Steel On Aluminum, Steel On Cast Iron, Cast Iron On Cast Iron can be found on the following table. The connected surfaces depends on the material of the connected parts, roughness, surface treatment and degreasing of the connected surfaces

For example, clean dry steel sliding on steel has a coefficient of friction of μ = 0.78, but if the surface has oxidized, the coefficient changes to μ = 0.27. Likewise, clean dry copper sliding on copper has a coefficient of μ = 1.21, while oxidized copper has a value of μ = 0.76. Need to know surface condition Is anyone aware of a standard coefficient of friction between this fiberboard and base? I am assuming a coefficient for fiberboard to soil would work to. Or if worst comes to worst, a coefficient for steel to the base. Thanks Coefficient of Friction (COF) is defined as the friction force opposing sliding motion divided by the force normal to the surface. People walk differently (most people demand a consistent COF of between 0.25 - 0.3 walking normally) Long fast strides demand a higher friction carbidedepot.co

Friction Coefficients - Alloys and Metal

D1894-14 Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting kinetic coefficient of friction~ static coefficient of friction~ plastic films~ plastic sheets What is the coefficient of friction between steel and asphalt? An easy way to determine the coefficient of friction is to do a simple test with the actual materials. In your case, place a piece of steel (any size) on a board coated with asphalt. N.. Friction coefficients between different wheel/tire materials and concrete . You can find good background information on friction here.. Here is an excellent discussion on friction coefficients, plus a comprehensive table of friction coefficients.. Figure 1: Static vs dynamic friction Friction coefficients of thermoplastics against steel of friction of 0. 2 for steel bearing on steel, 0 .1 for steel bearing on self-lubricating bronze plate, and O. 06 for polytetrafluorethylene (PTFE) on PTFE or stainless steel. For rocker-type bearings, they suggest that the force be calculated based on a 20 percent friction coefficient but reduced in propor

Water Flow in Copper Tubes - Pressure Loss due to FrictonSteel Pipes Schedule 80 - Friction loss and Velocity DiagramsAdhesion railway - Wikipedia

Aims: To compare the frictional coefficients between the stainless steel and B-titanium arch wire liga-tured to the stainless steel bracket via different ligatures. Materials and Methods: calculate the coefficient of friction which is: µ= p w ∕ 2 f h, were µ=coefficient of friction, p = friction (load cell reading Variations in Dry Sliding Friction Coefficients with Velocity . James Moran1,*and Thawan Sucharitakul2. 1,2Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, . Chiang Mai, 50200 Thailand * Corresponding author: james@dome.eng.cmu.ac.t Dry wear experiments provide an insight detail on how severely contacting surfaces change under unlubricated sliding condition. The theory of dry sliding wear is used for understanding mixed-lubrication regime in which asperity interactions play a significant role in controlling of the friction coefficient (f).The purpose of this work is to study the tribological behavior of AISI 304 steel in.

Friction Coefficient Tables in Air and Vacuum About

The coefficient of friction factor depending upon the supporting interface (i.e, the junction between Top of Steel and Bottom of Pipe or Bottom of Shoe/Cradle) shall be applied at all vertical restraints (+Y or Y supports) locations as mentioned below. But if ITB for any project provides separate data then those data shall be considered The coefficient of friction for ball style carriages is 0.002-0.003. Roller style carriages have a coefficient of friction of .001-.002. In light load applications seal drag, lubrication viscosity, preload, and other factors affect the total actuation force

Online reference tool for mechanical designers. Includes engineering data tables, material info, manufacturing methods, design guides and more! The objective of this article is show an easy way to measuring both dynamic and static friction factor between two solid surfaces, using Tilted plane method. The measuring process is developed by means of moving plane made of the material we want t

Coefficient of Friction Equation and Table Chart

today friction to share about linear guide: linear guide is made up of steel ball rolling guide, therefore the friction can be reduced to 1/50 of the traditional sliding sliding guide, especially quiet small friction coefficient, and the kinetic friction not big difference, so not happen idling skid phenomenon and can realize the movement precision of micron grade: in general, the friction. A stainless steel ball was pressed on to the skin with at a pre-set load and then moved across the skin at a constant velocity of 5 mm/min. The UMT continuously monitored the friction force of the skin and the normal force of the ball to calculate the friction coefficient in real-time If the friction coefficient and the mass of an object are known, then the required frictional force can be calculated mathematically. Thus, for the example: m F = μ x m N = 0.4 x 200 kg = 80 kg. If the friction resistance and the friction coefficient are known, then the mass can be calculated: m N = m F / μ = 80 kg / 0.4 = 200 k the coefficient of friction and temperature were obtained on specimens from austenitic and martensitic steels and severe adhesive wear (seizure) conditions were resulted [4] (Tarassov and Kolubaev, 1999). Measurements of friction coefficients made in dry sliding pin-on-disc tests with steel specimens reveale We conducted experiments in which steel and silicon or quartz are clamped together. Even with the smallest tangential forces we could apply, we always found reproducible sliding motions on the nanometer scale. The velocities we study are thousands of times smaller than in previous investigations. The samples first slide and then lock up even when external forces hold steady

Friction Losses in Pipe Fittings Resistance Coefficient K (use in formula hf = Kv²/2g) Fitting LD Nominal Pipe Size ½ ¾ 1 1¼ 1½ 2 2½-3 4 6 8-10 12-16 18-24 K Value Angle Valve 55 1.48 1.38 1.27 1.21 1.16 1.05 0.99 0.94 0.83 0.77 0.72 0.6 2.2.2: Following procedure is to verify the force required parallel to an inclined plane to move a body up the plane corresponds to the friction coefficient already found. First of all set the stainless steel plane horizontally at 10 slope. Place the towing cord and weight hanger in position to pull the tray up to the plane by placing any material tray at the lower end of plane

Coefficient of Friction - an overview ScienceDirect Topic

We recognize that relationship when we divide friction force by normal force - and identifying the quotient as the coefficient of friction. Amontons' paper De la résistance causée dans les machines was published in 1699 in Memoires de l'Académie des Sciences Table 2: Friction coefficients, m, from German Standard DIN 4421 (Ref 4) and prEN 12812 (Ref 3) Building material combination Friction coefficient, m Maximum Minimum 1 wood / wood (rubbing surfaces parallel to grain or at right 1.0 0.4 angles to grain) 2 wood / wood (one or both rubbing surfaces at right angles to 1.0 0. Where g is the gravitational acceleration, v is the initial velocity when the brakes are applied and f r is the rolling resistance coefficient and was assume to be equal to 0.013. A common value for K, for production car, is 0.0000658 s 2 /m 2; e is the Euler number and is equal to 2.718281828 The coefficient of friction is equal to tan(θ), where θ is the angle from the horizontal where an object placed on top of another starts to move. For a flat surface, you can pull an object across the surface with a force meter attached. Divide the Newtons required to move the object by the object's mass to get the coefficient of friction P. Andersson et al.:Static friction measurements on steel against uncoated and coated cast iron 6 TRIBOLOGIA - Finnish Journal of Tribology 1-2 vol 34/2016 in which mechanical energy is transferred under partly static and partly kinetic (sliding

Static and Kinetic Coefficient of Friction Reference Table

The friction coefficient for the bolted joint has a high influence of the tightening torque needed. This is however not always a factor that can be predicted, if not the right precautions are taken. Furthermore can the friction coefficient vary from fastener to fastener, even though the same material and surface treat-ment are used When designing friction grip bolted connections, engineers need to ensure that the Coefficient of Friction between the connecting surfaces exceeds 0.35. It is possible for hot dip galvanized structural steel to meet this coefficient of friction requirement, provided the connecting surfaces are treated appropriately Rolling Friction - Coefficient, Formula and Examples of Rolling Friction Sir Isaac Newton once wondered why apples on the trees fall to the ground. Trying to find an answer to this question, he proposed the laws of gravity in 1687 and gave an answer to his own question friction coefficients with various surface conditions which could be used at the base foundations. The tests show the average friction coefficients of 0.145, 0.121 and 0.108 for friction between steel-oil layer-steel plates, plastic-oil layer-plastic plates, and steel-oil layer-plastic plates, respectively use in buried pipe design. Residual friction coefficients for free-draining coarse-grained soils were between 0.15 and 0.5, whereas values were between 0.05 and 0.20 for fine-grained soil and coarse-grained soil having significant fines content. Peak friction coefficient was observed to increase with normal stress

This episode is sponsored by Audible. Try Audible: http://audible.com/crashcourse Why is it hard to move a heavy bookcase across a carpeted floor? And why is.. Limiting friction is just the maximum static friction force (if you go over that point static friction becomes kinetic friction).Let f = frictional force,c = coefficient of frictionN = Normal.

Trapezoidal Lead Screws - BT Precision

How to Calculate the Coefficient of Friction. If we are moving a 10,000# load of material with a steel base plate (steel) across a concrete floor (concrete) the force needed would be: COF X Weight of the load = Force. By looking at the table we can see the COF for steel on concrete is 0.6 The friction coefficient is higher because of the speed limit in Germany. HHH: 0.55-0.65 brake pads are used to allow the friction coefficient to change at a high temperature. Generally, the friction coefficient increases and decreases by 0.08 at a time of 100 degrees, and then decreases by 0.14 at 350 degrees The aim of the study was to determine the changes in the sliding friction coefficient and wear mechanism of PP impregnated by oils with respect to the unmodified PP under dry sliding conditions. The study showed that the impregnation of the PP clearly influenced the wear rate of PP and its friction coefficient. During the test, the wear behavior of the unmodified and impregnated polypropylenes.

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