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

Anonymous

Apr 01, 2026

Rating: 5/5

Met all specifications

Verified the hardness and dimensions. Everything matches the GB6170 standard perfectly.

Anonymous

Mar 08, 2026

Rating: 5/5

High quality fasteners

We use these for mining equipment. No stripping issues under high torque.

Anonymous

Feb 28, 2026

Rating: 5/5

Reliable supplier

Third time ordering. Consistency in dimensions is excellent across batches.

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.

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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