Internal Hex Bolts
We take an M10×1.5 at grade 12.9 as an example. The recommended torque is 60-70 N·m. The break torque is ≥110 N·m. The size range is M3 to M16. Carbon steel grades cover 8.8, 10.9, and 12.9. Grade 8.8 has tensile strength ≥800 MPa and yield ≥640 MPa. Grade 10.9 has tensile ≥1000 MPa and yield ≥900 MPa.
Hide Bolt Heads with Our Internal Hex Bolts
Do you need a flush surface? The bolt head cannot stick out. Our Internal Hex Bolts have a cylindrical head. They fit into a countersink hole. The surface stays flat after installation. They also transfer more tightening torque than external hex bolts. We are a Shanghai factory. We have supplied fasteners for 20 years.
Check Our Torque Data and Strength Grades
We take an M10×1.5 at grade 12.9 as an example. The recommended torque is 60-70 N·m. The break torque is ≥110 N·m. The size range is M3 to M16. Carbon steel grades cover 8.8, 10.9, and 12.9. Grade 8.8 has tensile strength ≥800 MPa and yield ≥640 MPa. Grade 10.9 has tensile ≥1000 MPa and yield ≥900 MPa. Grade 12.9 has tensile ≥1200 MPa and yield ≥1080 MPa. This meets ISO 898-1. Thread tolerance is 6g. The hexagon drive size precision is ±0.05 mm. This ensures a tight tool fit. The head bearing surface has a verticality ≤0.1 mm to the thread axis. The load spreads evenly when you tighten. We offer stainless steel SUS304, SUS316, SUS410 and carbon steel SWRCH35K, SCM435, SCM440. Surface finish includes black oxide, cleaning, zinc plating, or Dacromet. Zinc plating comes in white or yellow. Salt spray test lasts 48-72 hours. Dacromet gives 500+ hours for high corrosion areas.
|
Parameter |
Standard / Value |
|
Recommended Torque (M10, 12.9) |
60-70 N·m |
|
Break Torque (M10, 12.9) |
≥ 110 N·m |
|
Tensile Strength (12.9 grade) |
≥ 1200 MPa (ISO 898-1) |
|
Fatigue Life (10.9 grade) |
≥ 5,000,000 cycles (ISO 3800) |
Why Our MOQ and Sample Policy Support You
Cold headed parts start at 50,000 pieces. Machined parts depend on the size. Free samples are ready for stock items. Mass production takes 2-3 weeks for standard parts. Custom products take 4 weeks. Repeat orders are even faster. We pack with cartons. Inside we use plastic bags or boxes for separation. Payment is 30% deposit and 70% balance. We take US dollars. People use these bolts for mold making, machine assembly, automation equipment, bikes, and power tools.
The entire product line is fully customizable.
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