A
Anonymous
Apr 06, 2026
Rating: 5/5
Great Quality
Strong steel, no stripping during tightening. The zinc plating looks uniform across all units.
Description
High-Strength Grade 8.8 Zinc-Plated/Black Oxide Hex Nut GB6170, M5-M27
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Carbon Steel |
| Strength Grade | 8.8 |
| Thread Type | Metric Coarse |
| Surface Finish | Zinc Plated |
| Alternative Finish | Black Oxide |
| Manufacturing Standard | GB6170 |
| Size Range | M5 to M27 |
| Hardness | 22-32 HRC |
| Package Weight | Varies by Quantity |
| Country of Origin | Mainland China |
5 reviews
A
Anonymous
Mar 30, 2026
Rating: 5/5
Reliable
Standard industrial quality as described. Will order again when we run out of stock.
A
Anonymous
Mar 04, 2026
Rating: 5/5
Bulk Order OK
Consistent quality across 1000 units. We use these for general assembly and have had no failures.
A
Anonymous
Feb 05, 2026
Rating: 5/5
Perfect Fit
Threads aligned perfectly with my bolts. Used them for a machinery repair project and they held torque well.
A
Anonymous
Jan 27, 2026
Rating: 4/5
Good Value
Slightly slower delivery but product is good. Prices are competitive compared to local hardware stores.
5 FAQ
Q: Do you have M30 size available?
A: Currently we stock up to M27. Please contact us for custom larger size inquiries.
Q: Is the black oxide finish durable?
A: It provides corrosion resistance and a specific look, but zinc is generally better for rust protection.
Q: Can I use these outdoors?
A: Zinc plated offers mild corrosion resistance but is best for indoor use. Consider stainless steel for outdoors.
Q: Are these metric or imperial sizes?
A: These are metric standard nuts ranging from M5 to M27.
Q: What torque should I use for M10?
A: Please consult a Grade 8.8 torque chart for specific values based on your application.
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