Bolts and Screws

Stripper Bolt

We take a φ10 h7 size as an example. The actual diameter is 10.000 to 9.985 mm. When it fits with a linear bearing or bushing, the gap is very even. Tolerance is h6 or h7 level. That is ±0.005 mm to

Torch Slot Self-tapping Screws

We take an M5×20 trilobular screw into 2 mm thick SPCC steel as an example. The pre-drilled hole is φ4.5 mm. The driving torque is only 1.5-2.5 N·m. This is 20-30% lower than a regular trilobular

Phillips Head Hex Bolt Combination Screws

The washer has a anti-fall design. The axial pull-out force is ≥50 N. The parts will not separate during shipping or vibration. We take an M8×1.25 size at grade 8.8 as an example. The recommended

Square Washer Combination Screws

We take an M3×6 size as an example. The square washer has a side length of 6.5 mm. It fits a square hole on a switch or terminal block. The washer will not rotate. This avoids scratching the wire or

Torch Slot Combination Screws

We take an M6 Torx (T30) as an example. The maximum transfer torque is ≥25 N·m. This is much higher than a Phillips slot (PH3) at ≤12 N·m. We follow DIN 34800 for repeated tightening. After 100

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

External Hex Bolts

We take an M10×1.5 at grade 8.8 as an example. The recommended torque is 40-50 N·m. It creates about 15-18 kN of preload force. This is enough to lock most mechanical structures. The size range is M4

Expansion Bolts

We take an M10×100 mm expansion bolt in C30 concrete as an example. The embedment depth is 50 mm. The ultimate pull-out force is at least 8 kN. This follows ASTM E488. The ultimate shear force is at

Set Screws

We take an M8×1.25 cup point set screw as an example. You tighten it to the recommended torque of 15 N·m on a shaft. It makes at least 500 N of axial clamping force. This is enough to hold a gear

Welding Screws

We weld an M6 welding screw on a 1.5 mm thick SPCC steel sheet. We follow AWS C1.1 for torque testing. The break torque is ≥20 N·m. The failure mode is sheet tearing, not weld spot failure. This