Active Member
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[China]
Address: Handan Yongnian
Contact name:
Handan city Yongnian District Maide Fasteners Co. Ltd |
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Round Carbon Steel Heavy Duty Flat Metal Washers Palte Hot Dip Galvanized
Product Description
Flat washers are usually thin pieces of various shapes to reduce
friction, prevent leaks, isolate, prevent loosening, or distribute
pressure. This material is used in many materials and structures to
perform a variety of similar functions. Due to the limitations of
the material and process of the threaded fasteners, the bearing
surfaces of the fasteners such as the bolts are not large, so that
the surface of the parts to be joined is protected to reduce the
compressive stress of the bearing surface, and washers are used. In
order to prevent loosening of the connection pair, loose-proof
spring washers and multi-tooth lock washers, round nut stop washers
and saddle-shaped, corrugated, conical elastic washers are used.
Flat washers are mainly used to reduce the pressure. When some
parts are tightened with large axial forces, the washers are easily
pressed into a dish shape. In this case, the material can be
changed and the hardness can be improved.
The Role of Flat Mat
1. Increase the contact area between the screw and the machine.
2. Eliminate damage to the surface of the machine when the spring
pad is unloaded. When used, it must be a spring pad and a flat pad.
The flat pad is facing the surface of the machine. The spring pad
is between the flat pad and the nut.
Flat pad standard
National standards are different.
Here is the United States flat pad standard:
| 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 |
