Products

Solar Panel Fixing Screws

We follow ASTM B117 for neutral salt spray testing. SUS304 with passivation gives ≥720 hours with no red rust. SUS316 with passivation gives ≥1000 hours with no red rust. Without passivation, SUS304

Unique Seat Screws

We take an M8×1.25, grade 12.9 seat screw as an example. The proof load is ≥30 kN. The failure load is ≥36 kN. We follow GB/T 11557 or FMVSS 207 for seat impact testing. Under a 20g acceleration

Slotted Shaft

We take a φ10 mm, 40Cr material, HRC 35 slotted shaft as an example. The double shear failure load is ≥25 kN. This force is enough for excavator links or hydraulic cylinder ears. The outer diameter

Drilled Shaft

We take a φ10×50 mm drilled shaft with a φ3 mm hole as an example. We use a φ3 mm cotter pin. The axial pull-out force is ≥1.5 kN. We use a φ3×30 mm spring pin. The axial pull-out force is ≥2.5 kN.

Shaft Spacer Sleeve

We take a φ20×φ16×20 mm (OD×ID×length) spacer sleeve as an example. The outer diameter φ20 h7 is 20.000 to 19.985 mm. The inner diameter φ16 H8 is 16.000 to 16.027 mm. The length tolerance is ±0.1

Internal and External Threaded Copper Nut

We take an M8 outer / M6 inner brass nut as an example. The outer thread tightening torque is 15 N·m. The inner thread bolt torque is 10 N·m. The nut body does not deform or crack. Brass has an

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

Weldnut

We weld an M6 hex weldnut on a 1.5 mm thick SPCC steel sheet. We follow AWS C1.1 for torque testing. The break torque is ≥25 N·m. The failure mode is sheet tearing or thread stripping, not weld spot

Hex Head Security Bits

We take an S2 material T30 Torx bit as an example. The hardness is HRC 58-62. The minimum break torque is ≥30 N·m. This follows ISO 1173. In real use, you can safely put out 20-25 N·m of torque. This

Shaft Retaining Rings

We make our Shaft Retaining Rings from 65MN high carbon spring steel. We also offer 304 and 316 stainless steel for wet or coastal areas. The 65MN steel has a hardness of HRC 44-51. It meets the ISO

High Tensile Spring Washer

We take an M10 size as an example. We press the washer flat. It still gives at least 150 N of recovery force. We also did a transverse vibration test. It follows the ISO 16130 standard. The residual