China Square Washers Manufacturers, Exporter

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

Product Description

Related Products
Bolts Nuts and Washers
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Bolts Nuts and Washers

Nylon Washers
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Nylon Washers

Spring Washers
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Spring Washers

Lock Washers
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Lock Washers

Neoprene Washers
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Neoprene Washers

Fender Washer
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Fender Washer

Frequently Asked Questions
? What is the primary function of a washer in fastening systems?
Washers are primarily used to distribute the load of a threaded fastener, prevent damage to the surface being joined, and stop leakage or looseness caused by vibration.
? When should I choose Nylon Washers over metal ones?
Nylon washers are excellent for electrical insulation, dampening noise and vibration, and resisting corrosion. They are lighter and ideal for lighter-duty applications compared to metal options.
? How do Spring Washers and Lock Washers prevent loosening?
Spring washers provide tension that keeps the assembly tight against minor vibration, while lock washers feature teeth or split rings that physically bite into the bearing surface to resist rotational movement.
? What is the benefit of a Neoprene Washer?
Neoprene washers offer superior weather and moisture resistance, creating a flexible, watertight seal when compressed. They are widely used in plumbing and outdoor structural assemblies.
? What makes a Fender Washer different from standard flat washers?
Fender washers have a significantly larger outer diameter compared to their inner diameter. This design spreads the load over a wider surface area, making them perfect for soft materials or oversized holes.

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