China Square Washers Manufacturers, Supplier

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China Square Washers Manufacturers, Supplier

Nominal Bolt Size (M)	Inner Diameter (d₁) min (mm)	Inner Diameter (d₁) max (mm)	Width Across Sides (a) mm	Thickness (h) mm ±0.3	Hardness Class	Suitable Bolt Grade
M6	6.4	6.62	20	2.0 – 3.0	140 HV	≤ 8.8
M8	8.4	8.62	25	2.5 – 3.5	140 HV	≤ 8.8
M10	10.5	10.77	30	3.0 – 4.0	140 HV	≤ 8.8
M12	13	13.27	35	3.5 – 4.5	140 HV / 100 HV*	≤ 8.8
M14	15	15.27	40	3.5 – 4.5	100 HV	≤ 6.8
M16	17	17.27	45	4.0 – 5.0	100 HV	≤ 6.8
M20	21	21.33	55	4.0 – 5.0	100 HV	≤ 6.8
M24	25	25.52	65	5.0 – 6.0	100 HV	≤ 6.8
M27	28	28.52	75	5.5 – 6.5	100 HV	≤ 6.8
M30	31	31.62	80	6.0 – 7.0	100 HV	≤ 6.8
M36	37	37.62	95	7.0 – 8.0	100 HV	≤ 6.8

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Product Description

Related Products

Washers

Screw Washers

Spring Washers

Lock Washers

Neoprene Washers

Bolts Nuts and Washers

Frequently Asked Questions

● What is the primary function of industrial washers?

Industrial washers are primarily used to distribute the load of a threaded fastener, such as a bolt or nut, preventing damage to the surface being joined and reducing the risk of loosening over time.

● How do spring washers differ from standard flat washers?

Spring washers feature a unique curved or split design that provides axial flexibility and tension. This constant tension prevents fasteners from loosening due to vibrations or thermal expansion.

● What makes lock washers effective against vibration?

Lock washers are engineered to bite into the bearing surface of the nut or bolt head. Their helical or toothed structural design exerts a continuous spring force, keeping the assembly tight under dynamic loads.

● When should you choose neoprene washers?

Neoprene washers are ideal for applications requiring a tight, waterproof seal. They offer excellent resistance to weather, ozone, and oils, making them popular in plumbing, outdoor structures, and automotive projects.

● Can bolts, nuts, and washers be reused?

While some standard fasteners can be reused if they are free from wear and corrosion, high-tensile bolts and critical components like split lock washers should generally be replaced to ensure joint reliability and safety.