Alloy Steel Threaded Knurled Thumb Nut Black Knobs Clamping Screw Grip Knob Screw

描述

1.Exceptional Mechanical Performance

Head Material:PP

Thread Material:Carbon Steel/Alloy Steel

Machined from quenched-and-tempered alloy steel, these knurled thumb nuts exhibit tensile strengths ≥900 MPa and yield strengths ≥750 MPa, with a core hardness of 35–42 HRC. A uniform black-oxide or black-zinc finish (≥8 µm thickness) provides moderate corrosion resistance while preserving precise thread engagement across standard ISO metric sizes (M4–M16).

2.Broad Application Versatility
Ideal for hand-adjustable clamping in machine tool fixtures, jigs and workholding setups, laboratory instruments, photographic and lighting rigs, electronics enclosures, and furniture assemblies. Their standardized threads ensure seamless compatibility with metric rods, studs, and threaded inserts across industrial, commercial, and DIY projects.

3.Effortless, Tool-Free Operation
Deep, precision-machined knurling and an oversized diameter deliver secure finger-tight fastening up to 5–8 Nm torque without wrenches or screwdrivers. The ergonomic grip minimises hand fatigue during repetitive adjustments, and the low-profile design prevents snagging in confined spaces.

4.Premium Quality & Reliability
Manufactured in ISO 9001-certified facilities to DIN 985 tolerances (±0.1 mm), each lot undergoes dimensional inspection, hardness testing, and finish-thickness verification. Salt-spray resistance exceeds 72 hours per ASTM B117. Full material traceability and batch-specific certificates ensure consistent performance in critical applications.