Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Washers
Origin	-
Material	Carbon Steel
Grade	8.8
Standard	GB97
Finish	Black Oxide
Type	Flat Washer (Enlarged & Thickened)
Available Sizes	M2, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M30, M36, M42, M45
Hardness	HRC 22-32
Application	Machinery, Automotive, Construction, DIY Projects
Package Contents	Assorted Kit or Bulk Pack (Select Option)
Corrosion Resistance	Moderate (Suitable for indoor use; oil coating recommended for outdoor)

6 reviews

Anonymous

Mar 22, 2026

Rating: 5/5

Perfect for heavy-duty applications

These thickened washers are exactly what I needed for my automotive project. The black finish looks professional and the Grade 8.8 rating gives me confidence in the durability.

Anonymous

Mar 22, 2026

Rating: 5/5

Excellent enlarged size

I specifically needed the enlarged outer diameter to cover larger holes in my fabrication work. These GB97 standards are spot on. Highly recommended.

Anonymous

Mar 19, 2026

Rating: 4/5

Solid hardware

Very strong washers. The black oxide finish seems durable enough for indoor machinery. Took off one star only because shipping took a bit longer than expected.

Anonymous

Mar 18, 2026

Rating: 5/5

Exactly as described

If you need a thick, high-grade flat washer, look no further. The M12 size handled high torque without deforming. Will buy again.

Anonymous

Mar 04, 2026

Rating: 5/5

Great value for bulk purchase

Bought the M6 and M8 mix for our workshop. The consistency in thickness is impressive. No bent or defective pieces in the batch of 200.

Anonymous

Mar 03, 2026

Rating: 4/5

Good quality, slightly oily

The washers are very sturdy and fit perfectly. They arrived with a light oil coating which is normal for this type of steel, but just be prepared to wipe them down before use.

5 FAQ

Q: Do you sell individual sizes or only kits?

A: We offer both options. You can select specific sizes in bulk quantities (e.g., 100 pcs of M6) or choose our assorted variety kits that include a range of sizes from M2 to M12.

Q: What is the exact thickness of the M10 washer?

A: For the GB97 Enlarged and Thickened series, the M10 washer typically has a thickness of 3mm, which is greater than the standard DIN125 specification. Please check the specific size chart in the product images for precise tolerances.

Q: Can these handle high-torque bolting?

A: Yes, being Grade 8.8 hardened steel, these washers are designed to distribute load effectively under high-torque conditions and resist deformation better than standard soft steel washers.

Q: Is the black coating prone to flaking?

A: The black oxide finish is chemically bonded to the steel and is generally resistant to flaking under normal installation. However, excessive scratching or bending after installation may expose the underlying metal.

Q: Are these washers suitable for outdoor use without additional treatment?

A: While the black oxide finish offers some protection, we recommend applying oil or using them in conjunction with rust-inhibiting measures for prolonged outdoor exposure to prevent corrosion.

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