Bolts Spec Table
Bolts are the most widely used fasteners in mechanical and construction applications. Different head types — hex bolts (KS B 1002), socket cap screws, flat-head screws, and tapping screws — suit different applications. Strength grades (4.8, 8.8, 10.9, 12.9) significantly affect allowable load. Carbon steel is standard; stainless steel (A2/A4) or special-plated versions are used for outdoor, food, or medical environments.
Hex Bolt
Hex Bolt · 16 sizes
Socket Head Cap Screw
Socket Head Cap Screw · 11 sizes
Countersunk Bolt
Countersunk Bolt · 8 sizes
Pan Head Screw
Pan Head Screw · 5 sizes
Set Screw
Set Screw · 7 sizes
Eye Bolt
Eye Bolt · 7 sizes
U-Bolt
U-Bolt · 9 sizes
Wing Bolt
Wing Bolt · 5 sizes
Tapping Screw
Tapping Screw · 8 sizes
Threaded Rod
Threaded Rod · 9 sizes
Unified Thread
Unified Thread · 10 sizes
Hex Flange Bolt
Hex Flange Bolt · 7 sizes
Frequently Asked Questions
What is the clearance hole size for an M10 bolt?
For M10 bolts, 11mm drill is standard. Loose fit: 11.5mm, medium: 11mm, close: 10.5mm.
What is the difference between a hex bolt and a socket head cap screw?
Hex bolts have a hexagonal head tightened with a spanner. Socket head cap screws have a hex socket driven by an Allen key. Socket screws take less space and give a cleaner appearance.
What do bolt strength grades (4.8, 8.8, 10.9) mean?
First digit × 100 = tensile strength (MPa); full value × 10 = yield strength (MPa). Example: grade 8.8 means 800 MPa tensile, 640 MPa yield.