Carbon Steel Plain Washer PTFE Coated in Blue
The plain washer is also callled flat washer, mainly stamped out of
an iron plate, is generally shaped as a flat washer with a hole in
the middle.
The Basic knowledge of plain washer:
Plain washers are usually thin parts of various shapes used to
reduce friction, prevent leakage, isolate, prevent loosening or
disperse pressure. Such parts are found in many materials and
structures and are used to perform a variety of similar functions.
Threaded fasteners by the material and process limitations, bolts
and other fasteners are not large support surface, so to reduce the
compressive stress on the bearing surface to protect the surface of
the connected parts, its use of washers. To prevent the connection
of the vice of the loose spring washers and multi-tooth lock
washers, round nut stop washers and saddle, waveform, conical
elastic washers.
Plain washers are mainly used to reduce the compressive force, when
there are parts of the tightening axial force is very large, easy
to make the gasket pressed into the disc, then you can change the
material and improve the hardness to solve.
US standard for flat washer:
Specification | Minor Diameter | Outside Diameter | Thickness Tolerance | Thickness Tolerance
Disintegration |
|
USS 3/16 | 6.22～6.73 | 14.15～14.66 | 0.91～1.65 | 0.91～1.40 |
1.40～1.65 | | | | |
USS 1/4 | 7.80～8.31 | 18.47～19.02 | 1.30～2.03 | 1.30～1.65 |
1.65～2.03 | | | | |
USS 5/16 | 9.40～9.91 | 22.05～22.99 | 1.63～2.64 | 1.63～2.20 |
2.20～2.64 | | | | |
USS 3/8 | 11.00～11.51 | 25.22～26.16 | 1.63～2.64 | 1.63～2.20 |
2.20～2.64 | | | | |
USS 7/16 | 12.57～13.08 | 31.57～32.51 | 1.63～2.64 | 1.63～2.20 |
2.20～2.64 | | | | |
USS 1/2 | 14.15～14.60 | 34.75～35.69 | 2.18～3.35 | 2.18～2.70 |
2.70～3.00 | | | | |
3.00～3.35 | | | | |
USS 9/16 | 15.75～16.26 | 37.13～38.07 | 2.18～3.35 | 2.18～2.70 |
2.70～3.00 | | | | |
3.00～3.35 | | | | |
USS 5/8 | 17.30～18.24 | 44.27～45.21 | 2.74～4.06 | 2.74～3.20 |
3.20～3.60 | | | | |
3.60～4.06 | | | | |
USS 3/4 | 20.45～21.39 | 50.62～51.56 | 3.10～4.50 | 3.10～3.60 |
3.60～4.20 | | | | |
4.20～4.50 | | | | |
USS 7/8 | 23.65～24.58 | 56.97～57.91 | 3.45～4.88 | 3.45～4.00 |
4.00～4.30 | | | | |
4.30～4.88 | | | | |
USS 1 | 26.80～27.74 | 63.32～64.26 | 3.45～4.88 | 3.45～4.00 |
4.00～4.30 | | | | |
4.30～4.88 | | | | |
USS 11/8 | 31.57～32.51 | 69.67～70.61 | 3.45～4.88 | 3.45～4.00 |
4.00～4.30 | | | | |
4.30～4.88 | | | | |
USS 11/4 | 34.75～35.69 | 76.02～76.96 | 3.45～4.88 | 3.45～4.00 |
4.00～4.30 | | | | |
4.30～4.88 | | | | |
USS 13/8 | 37.85～39.24 | 82.30～83.69 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
USS 11/2 | 41.02～42.42 | 88.65～90.04 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
USS 15/8 | 44.20～45.59 | 95.00～96.39 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
USS 13/4 | 47.37～48.77 | 101.35～102.74 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
USS 17/8 | 50.55～51.04 | 107.70～109.09 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
USS 2 | 53.72～55.12 | 114.05～115.44 | 3.89～5.41 | 3.89～4.40 |
4.40～5.00 | | | | |
5.00～5.41 | | | | |
The role of the plain washer:
1. Increase the contact area between the bolt and the machine.
2.To eliminate the damage to the surface of the machine when the
spring washer is unloading the screw. When using must be a spring
washer a plain washer, the plain washer next to the machine
surface, the spring washer between the plain washer and the nut.
Application Range:
1. Machines, auto industry, roads,
2. Bridges, tunnels, urban railway systems,
3. High speed railways, watercrafts, thermal power,
4. Wind power, nuclear power, petrochemical, aerospace,
5. Steel roof constructions and so on.
Photos:
