China Side Lock Tool Clamping Factories & Factory

Side lock toolholders (Weldon shank according to DIN 1835-B) incorporate a heavy set screw that locks directly against the precision flat ground into the cutting tool shank. In contrast to collet chucks which rely purely on radial friction, the side lock mechanism creates an unyielding physical mechanical stop. This entirely eliminates tool pull-out or rotational slipping during high-torque, heavy-chip roughing of difficult materials like hardened alloy steels, titanium, and forged iron.

Traditional side lock holders suffer from inherent runout due to the clamping screw pushing the shank against one side of the bore. We counteract this through sub-micron bore tolerance control (held to ISO H4/H5 limits via precision diamond honing), compensated centerline boring, and high-precision CNC cylindrical grinding of the spindle taper. As a result, our side lock holders achieve repeatable runouts under 0.003 mm to 0.005 mm at 3D tool overhang.

All MPM side lock holders and CNC tool bodies are forged from premium 20CrMnTi or SCM420H carburizing alloy steel. Components undergo controlled vacuum carburizing to a depth of 0.8–1.2 mm, followed by cryogenic sub-zero quenching (-196°C) and low-temperature stress relief. This yields a surface hardness of HRC 58-62 for exceptional wear and scratch resistance, while maintaining a ductile core (HRC 32-38) to absorb heavy shock cutting impacts.

Yes. Our in-house engineering team provides complete OEM and ODM design services. We frequently customize gauge lengths (standard, extended, stubby), internal coolant delivery channels (DIN 69871 Form AD+B), dual-flat clamping configurations, and hybrid taper connections (BT30/40/50, HSK63A/100A, CAT40/50). Detailed CAD/CAM models and 2D inspection drawings are submitted for customer sign-off prior to batch production.

Holders undergo dynamic pre-balancing on computerized dynamic balancing equipment. Because a side lock holder is inherently asymmetric due to the clamping screw hole, our holders feature precision engineered counterweights and counter-bored balancing pockets to achieve dynamic balancing grades of G2.5 at 20,000 to 25,000 RPM, preventing spindle bearing fatigue and harmonic chatter.

Standard catalog products ship within 7–15 days, while custom OEM production runs generally take 30–45 days depending on metallurgical heat treatment cycles. All tooling components are degreased, coated in high-performance VCI anti-corrosion oil, vacuum sealed in polyethylene blisters, and packed in reinforced export-grade plywood crates suitable for transoceanic maritime or air freight.