A
Anonymous
Apr 11, 2026
Rating: 5/5
Precise threading
Threads engage smoothly without cross-threading. Very satisfied with the quality and finish.
Description
Grade 12.9 High-Strength Hex Socket Screws, Cylinder Head Bolts, 10mm Full Thread Cup Head Screws M3 M4 M5 M6 M10
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel |
| Strength Grade | 12.9 |
| Surface Finish | Black Oxide |
| Thread Standard | ISO Metric Coarse |
| Head Style | Cylindrical Cap |
| Drive Type | Hex Socket |
| Thread Coverage | Full Thread |
| Hardness | 39-44 HRC |
| Min Tensile Strength | 1200 MPa |
| Package Quantity | 100 Pieces |
5 reviews
A
Anonymous
Apr 06, 2026
Rating: 5/5
Professional grade
We use these in our workshop daily. Consistent quality across batches and good value.
A
Anonymous
Apr 01, 2026
Rating: 4/5
Good but strict torque
Great screws but be careful not to overtighten as high strength steel can be brittle.
A
Anonymous
Mar 06, 2026
Rating: 5/5
Fast delivery
Arrived well organized in a plastic case. Exactly what I needed for my project.
A
Anonymous
Feb 04, 2026
Rating: 5/5
Excellent for machinery
Used these for assembling a motor mount. The strength is genuine 12.9 grade and they hold torque well.
5 FAQ
Q: Are they rust proof for outdoor use?
A: Black oxide provides limited corrosion resistance, not suitable for wet environments.
Q: Is this material stainless steel?
A: No, this is alloy steel with a black oxide coating for strength.
Q: Do you sell matching nuts separately?
A: Yes, please check our store for Grade 12.9 compatible nuts.
Q: What hex key size is needed for M5?
A: M5 socket cap screws typically require a 4mm hex key.
Q: Is the head height standard ISO?
A: Yes, dimensions follow ISO 4762 standards for socket cap screws.
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