Accutek 87921320B ER32 Type Z Balanced 40x12.4mm Slotted Steel Hex Nut (6 Pcs)

This listing is for a set of six (6) new Accutek part number 87921320B ER32 Type Z balanced clamping nuts, measuring 40 mm outer diameter × 12.4 mm height, with a slotted hex perimeter for use with a spanner or hook wrench. The Type Z designation indicates a precision-balanced nut design engineered for high-speed CNC machining center applications, where rotational imbalance at elevated RPM causes vibration, reduced tool life, and poor surface finish; balancing is confirmed by the "BALANCED NUT" and "ER 32 BALANCED" markings visible on the nuts in the photos. The specified tightening torque is 136 Nm / 100 ft-lbs, stamped directly onto each nut, ensuring repeatable collet clamping force when used with standard ER32 collet chucks conforming to DIN 6499 / ISO 15488. These steel nuts accept the full range of ER32 collets (clamping range 3–20 mm) and are compatible with ER32 toolholders in CAT, BT, HSK, and straight-shank configurations. The slotted hex outer profile accommodates standard ER32 hook-and-pin spanner wrenches for secure torque application.

Product Specifications