Alloy Steel Knurled Thumb Screw-SS18-8 Shoulder Bolt Grip Knob Fastener

description

1.Superior Mechanical Performance
Machined from quenched-and-tempered alloy steel, these knurled thumb screws feature tensile strengths ≥900 MPa, yield strengths ≥750 MPa and core hardness of HRC 36–44. The precision-machined knurling ensures consistent torque transfer, while a durable black-oxide (or optional zinc) finish (≥8 μm) provides moderate corrosion resistance and smooth thread engagement.

2.Versatile Application Spectrum
Designed for tool-free fastening, positioning and pivoting in machine-tool fixtures, jigs and assembly lines, robotics and automation, lab instruments, electronics enclosures, camera rigs, sliding covers and furniture hardware. Available in standard metric threads (M4–M12) with shoulder lengths from 5 mm to 20 mm to suit a wide range of spacing and bearing-surface requirements.

3.Effortless, Tool-Free Operation
The oversized, deeply knurled head allows secure finger-tightening up to 6–8 Nm of torque without tools. Low-profile head designs prevent snagging in confined spaces, and the smooth shoulder surface minimizes friction during repeated adjustments and clamp-release cycles.

4.Premium Quality & Durability
Manufactured in ISO 9001-certified facilities to DIN tolerances (±0.05 mm), each lot undergoes dimensional inspection, hardness testing and finish-thickness verification. Black-oxide coatings resist ≥72 h salt spray per ASTM B117. Full material traceability and batch-specific certificates ensure consistent, long-lasting performance in demanding industrial environments.