A
Anonymous
Apr 01, 2026
Rating: 5/5
Met all specifications
Verified the hardness and dimensions. Everything matches the GB6170 standard perfectly.
Description
GB6170 High-Strength Hex Nuts M39 M42 M48 M52 M56 M60 M64 M68 M72 M76 M80 M90
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Standard | GB/T 6170-2015 |
| Material | Carbon Steel 45# / 40Cr Alloy |
| Strength Grade | 8.8, 10.9, 12.9 |
| Thread Type | Metric Coarse & Fine Pitch |
| Surface Treatment | Zinc Plated, Black Oxide, Hot Dip Galvanized |
| Size Range | M39, M42, M45, M48, M52, M56, M64, M72, M80, M90 |
| Hardness | HRC 24-32 (Grade 8) |
| Certification | ISO 9001:2015 Certified |
| Packaging | Wooden Pallets or Custom Cartons |
| Country of Origin | China |
5 reviews
A
Anonymous
Mar 08, 2026
Rating: 5/5
High quality fasteners
We use these for mining equipment. No stripping issues under high torque.
A
Anonymous
Feb 28, 2026
Rating: 5/5
Reliable supplier
Third time ordering. Consistency in dimensions is excellent across batches.
A
Anonymous
Feb 12, 2026
Rating: 5/5
Perfect for heavy machinery
Ordered M56 nuts for a construction project. Threads were precise and material certs were included.
A
Anonymous
Feb 07, 2026
Rating: 4/5
Good value
Quality is solid. Shipping took a bit longer than expected but product is as described.
5 FAQ
Q: Can I get a mill test certificate?
A: Yes, we provide EN 10204 3.1 certificates upon request.
Q: Do you offer fine pitch threads?
A: Yes, both standard and fine pitch options are available.
Q: What is the lead time for M90 sizes?
A: Typically 10-15 days for large diameter stock items.
Q: Are these compatible with ISO 4032?
A: Yes, dimensions are largely compatible with ISO 4032 Hex Nuts.
Q: What is the recommended torque for Grade 10.9?
A: Torque varies by lubrication; please consult our engineering table for specifics.
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