RS PRO Black Multiple Lobe Clamping Knob, Two Part Polypropylene Inner Moulding, Soft Touch Thermoplastic 188-3446

RS PRO 188-3446 Black Multiple Lobe Clamping Knob is designed for demanding industrial and mechanical applications. Featuring a robust two-part construction, this knob combines a polypropylene inner moulding with a soft touch thermoplastic elastomer (TPE-39) over moulding, delivering excellent grip and ergonomic comfort in hand-operated clamping and fastening scenarios. The knob’s multiple lobe shape enables easy manual adjustment and torque application, enhancing operator efficiency in assembly and maintenance tasks.

With a threaded through hole and M8-sized brass female insert, the knob provides reliable compatibility with standard threaded shafts, bolts, and fixtures. Its 60 mm diameter offers a substantial gripping area, ensuring users can confidently tighten or loosen connections even while wearing work gloves. The black finish not only retains a professional industrial appearance but also supports visibility in varied work environments.

Engineered to stringent standards, this clamping knob is UL94, HB (1.5mm) flame retardant rated, making it suitable for environments where fire safety is critical. The material delivers a tensile strength of 11 MPa and tear strength of 30 kN/m, supporting repeated use in applications subject to frequent manual operation. High electrical resistivity (8 x 1015 ohm.cm) ensures suitability for locations with sensitive electronics and electrical installations.

Durability is further supported by water absorption at just 0.05%, abrasion resistance of 190 mm³, and moulding shrinkage of 1.8%. The knob’s elongation at break at 470% demonstrates material flexibility and resistance to mechanical stresses. Its density is 1160 kg/m³, reflecting robust composition for industrial hardware environments.

This clamping knob finds widespread use across mechanical hardware, engineering materials, and machine tools - ideal for securing panels, enclosures, jigs, fixtures, and equipment requiring frequent adjustment. Typical environments include factory maintenance, equipment assembly, laboratory setups, and installations with strict comfort, safety, and reliability requirements.

The RS PRO 188-3446 knob’s construction, performance, and compliance make it an excellent choice for manufacturers, mechanical engineers, laboratory technicians, and industrial operators. Browse more RS PRO Clamping Knobs and industrial hardware in the Hand Tools category on EnvMart.