Attributes

Brand	-
Category	Industrial Small Parts / Connectors and Fasteners
Origin	-
Material	Stainless Steel 304
Strength Grade	A2-70
Industrial Standard	GB 858
Compatible Nut Shape	Round Nuts
Available Diameters	M180, M200
Surface Finish	Polished and Passivated
Hardness Range	HV 250-350
Recommended Use	Robotic Base Mounting
Corrosion Resistance	High (Indoor/Outdoor)
Package Weight	Approx. 5.2 kg per unit

5 reviews

Anonymous

Mar 25, 2026

Rating: 5/5

Precise dimensions

Measured the M200 size and it fits our round nuts perfectly. No issues with alignment.

Anonymous

Mar 18, 2026

Rating: 5/5

Standard compliance

Verified against GB 858 standards. Excellent for our manufacturing line modules.

Anonymous

Feb 24, 2026

Rating: 5/5

Solid construction

These washers are exactly what we needed for our industrial robot base. The A2-70 grade holds up well under vibration.

Anonymous

Jan 30, 2026

Rating: 5/5

Durable material

Stainless steel 304 is holding up nicely in our workshop environment. No rust so far.

Anonymous

Jan 30, 2026

Rating: 4/5

Good quality, heavy shipping

The product is great, but be aware these are very heavy due to the size. Shipping cost reflected that.

5 FAQ

Q: Is bulk pricing available?

A: Please contact our sales team directly for quotes on quantities over 50 units.

Q: Are these compatible with metric round nuts?

A: Yes, these are designed specifically for metric round nuts according to GB 858.

Q: What is the inner diameter tolerance?

A: The inner diameter follows standard GB 858 tolerances for M180 and M200 sizes.

Q: Do you provide material certificates?

A: Yes, we can provide a mill test certificate upon request for bulk orders.

Q: Can these be used in high vibration environments?

A: Yes, the lock washer design helps prevent loosening under vibration typical in robot modules.

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