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Handan city Yongnian District Maide Fasteners Co. Ltd Galvanized Hex Bolts，Fully Threaded Hex Bolts，Galvanized Hex Nut
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Narrow Round Metal Washers M4 M5 , Thin Flat Washers DIN BSW ANIS Standard

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Narrow Round Metal Washers M4 M5 , Thin Flat Washers DIN BSW ANIS Standard

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Brand Name : MAIDE

Model Number : M3-M56

Certification : ISO

Place of Origin : Yongnian，Hebei,China

MOQ : 1TON

Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram

Delivery Time : 7-30work days

Packaging Details : Bags (25kg)

Material : Iron

Size : M3-M52

Grade : 4.8 8.8 12.9

Color : White & Yellow

Standard : DIN BSW ANIS

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Hot Dip Galvanized Narrow Flat Metal Washers M4 M5 , Thin Flat Washers DIN BSW ANIS

Standard

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.

Flat Metal Washers, which is mainly punched out with an iron plate, is generally a flat washer with a hole in the middle. There is a calculation formula in the “Compound Encyclopedia of Standard Fasteners” published by China Standards Publishing House. The formula is: Thousand pieces weight m=0.00785×{3.1416/4×washer height×(single circle diameter-square of inner hole diameter) }

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 　　 　　 　　 　　

Narrow Round Metal Washers M4 M5 , Thin Flat Washers DIN BSW ANIS Standard


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