Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Washers
Origin	-
Material Grade	Grade 12.9 High-Strength Steel
Surface Finish	Black Oxide Coating
Type	Split Spring Lock Washer (GB93 Standard)
Available Sizes	M3, M4, M5, M6, M8, M10, M48
Hardness	HRC 39-44
Tensile Strength	≥ 1220 MPa
Application	Automotive, Machinery, Structural Assembly
Corrosion Resistance	Moderate (Indoor/Dry Environments)
Package Type	Bulk Box or Plastic Bag
Origin Standard	Compliant with GB93 Specification

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good quality, fast shipping

The black oxide finish looks professional and the steel feels very solid. Only giving 4 stars because the packaging was a bit crushed upon arrival, but the parts were fine.

Anonymous

Mar 16, 2026

Rating: 5/5

Industrial strength

Using these for industrial conveyor belt assembly. The elasticity is excellent and they maintain tension even after thermal cycling. Highly recommended for heavy machinery.

Anonymous

Mar 14, 2026

Rating: 5/5

Exactly as described

Needed specific GB93 standard washers for a machine repair. These matched the specs perfectly. The split tension is consistent across all pieces in the box.

Anonymous

Mar 11, 2026

Rating: 3/5

Good but be careful with sizing

The quality is high, but make sure you double-check the inner diameter before ordering. I accidentally ordered M5 instead of M6. My mistake, but the product itself is solid.

Anonymous

Mar 06, 2026

Rating: 5/5

Perfect for high-torque applications

These washers are incredibly tough. I used the M8 size on my off-road vehicle suspension and they held up perfectly under heavy vibration without loosening.

Anonymous

Mar 05, 2026

Rating: 5/5

Great value for Grade 12.9

Hard to find genuine 12.9 grade washers at this price point. They don't strip easily when tightened down. Will definitely order the M10 size next time.

5 FAQ

Q: Is this compatible with ISO 7090 standards?

A: This product strictly follows the GB93 standard. While dimensions are similar to ISO 7090, there may be slight variations in thickness or outer diameter. We advise checking your specific engineering requirements.

Q: Can these be reused after removal?

A: Spring lock washers are generally designed for single-use applications. Reusing them may result in reduced locking force and compromised tension, so we recommend replacing them during disassembly.

Q: Are these washers suitable for outdoor use in rainy conditions?

A: While the black oxide coating offers some protection, these are best suited for indoor or dry environments. For prolonged outdoor exposure, we recommend stainless steel or zinc-plated alternatives.

Q: Do you sell these in individual counts or only by weight?

A: We sell them by piece count in standardized boxes (e.g., 100pcs, 500pcs) as well as by kilogram for bulk orders. Please select your preferred quantity option on the product page.

Q: What is the exact hardness range for the M6 size?

A: All sizes in this Grade 12.9 series, including M6, have a hardness range of HRC 39-44, ensuring consistent performance across different diameters.

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