Attributes

Brand	-
Category	Industrial Small Parts / Connectors and Fasteners
Origin	-
Material	Carbon Steel
Strength Grade	8.8
Finish	Black Oxide
Standard	GB/T 70.1
Head Type	Socket Head Cap
Drive Style	Hex Socket
Thread Pitch	Metric Coarse
Size Range	M3 to M24
Hardness	250-320 HV
Packaging	Protective Plastic Box

5 reviews

Anonymous

Apr 07, 2026

Rating: 5/5

Perfect fit

Ordered M6 and M8 sizes. They fit perfectly into standard metric taps. Very satisfied with the strength.

Anonymous

Mar 12, 2026

Rating: 4/5

Good but packaging could be better

The screws themselves are great Grade 8.8 quality. One box arrived slightly crushed but no damage to the contents.

Anonymous

Mar 04, 2026

Rating: 5/5

Fast delivery

Needed these urgently for a machine repair. Shipping was quick and the items were well organized by size.

Anonymous

Feb 20, 2026

Rating: 5/5

Standard compliance confirmed

Measured several samples with calipers. They meet GB70.1 specifications accurately. Will buy again.

Anonymous

Feb 01, 2026

Rating: 5/5

Excellent quality for the price

These screws are exactly what I needed for my CNC project. The threads are clean and the black oxide finish is uniform.

5 FAQ

Q: Are these screws suitable for outdoor applications?

A: Black oxide provides some corrosion resistance, but for outdoor use, we recommend applying oil or using stainless steel alternatives.

Q: Do you offer bulk discounts for orders over 1000 pieces?

A: Yes, please contact our sales team directly for volume pricing on large quantity orders.

Q: What Allen key size is needed for M10?

A: For M10 Grade 8.8 socket head cap screws, a 8mm hex key is typically required.

Q: Can I return unused boxes if I order too many?

A: Yes, unopened packages can be returned within 30 days according to our return policy.

Q: Is there a certificate of material included?

A: Test reports are available upon request at checkout for quality assurance purposes.

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