OEM Retention Knobs — Extra Strong
Premium grade pull studs supplied to OEM machine-tool builders. Higher tensile strength, tighter form tolerances, traceable material certification, and proof-test data per piece.
OEM Customers Served
Listed builders use PTP CNC retention knobs as OEM-spec replacement / spare items. Contact PTP CNC for builder-specific drawing numbers and proof-test certificates.
Material
Premium high-alloy carburizing steel, builder-specified grade. Hardness HRc 56-62 case, core ductile.
Inspection
100% MPT (magnetic-particle) testing. Proof-tested at ≥ 2.5× clamping force. Each piece serial-marked with traceability.
Form Accuracy
Tight cone-tolerance grade matched to OEM drawings. Pre-balanced G6.3 @ 15,000 rpm. Optional fine-balance G2.5 @ 25,000 rpm.
Catalogue Reference Pages 38-41
OEM Retention Knobs — Extra Strong (1/4)
Need an OEM-spec pull stud?
Send us your machine model + spindle taper + drawbar pull-force range. We'll match an OEM-equivalent retention knob with full proof-test certification.