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Plain Washers

Plain Washers are also known as Flat washers and their work is to distribute the fastener’s load while reducing heat and friction during the tightening process. They are typically designed to spread the loan and protect the respective surface from damage. They can also be used as spacers, as is common in industrial and domestic applications. Flat washers are also called on to provide electrical insulation. Plain washers do not have a locking function, rather they are used to protect the mating surface from damage.
Plain washers can also be used when the hole is bigger than the nut. The main role of flat washers is to increase the size of a screw's bearing surface area and reduce the surface pressure applied on the fastened object. The most common type of washers is plain washers, also known as flat washers. Looseness can result when the bearing surface sinks under the surface pressure, so using a flat washer to reduce the surface pressure is very effective. Common examples of plain washers include fender washers, spherical washers, wall washers, and torque washers.


Plain & Flat Washers | IS 5369/ DIN7349 | ASTM A325/DIN 125 A


Size M1.6 M2 M2.5 M3 M3.5 M4 M5 M6 M7
d1 1.7 2.2 2.7 3.2 3.7 4.3 5.3 6.4 7.4
d2 4 5 6 7 8 9 10 12 14
s 0.3 0.3 0.5 0.5 0.5 0.8 1 1.6 1.6
Approx Count Per 50kg. 2083333 1351351 568182 420168 322581 162338 112867 49020 35971


Size M8 M10 M12 M14 M16 M18 M20 M22 M24
d1 8.4 10.5 13 15 17 19 21 23 25
d2 16 20 24 28 30 34 37 39 44
s 1.6 2 2.5 2.5 3 3 3 3 4
Approx Count Per 50kg. 27322 14006 7974 5800 4425 3401 2907 2732 1548


Size M27 M30 M33 M36 M39 M42 M48 M52
d1 28 31 34 37 40 43 50 54
d2 50 56 60 66 72 78 92 98
s 4 4 5 5 6 7 8 8
Approx Count Per 50kg. 1182 933 664 543 376 273 170 152