Parlec 028-905 Insert Screw T7 Torx M2.5 Thread Boring

Product Description

The PARLEC 028-905 is a Torx-drive insert screw designed to secure indexable carbide inserts in boring toolholders and similar indexable cutting tool assemblies. It uses an M2.5 thread and a T7 Torx drive socket, providing the precise clamping torque needed to hold inserts securely during cutting operations. The screw measures 7.50 mm (0.2953 inches) in overall length with a head diameter of 0.1378 inches, making it a compact fastener suited for small-bore tooling. Licensed HVAC machinists, CNC operators, and tool crib technicians regularly stock these screws as consumable hardware alongside their insert inventory.

This insert screw is used primarily in indexable boring operations on CNC lathes, machining centers, and manual boring equipment. It is a direct-fit clamping fastener for a defined set of CCMT and TCMT insert geometries with inscribed circle sizes of 0.218 inches and 0.250 inches. It is not intended for milling or drilling insert systems that use different drive standards or thread sizes. Shops running high-volume turning operations typically keep a supply on hand to replace screws that show thread wear or Torx socket damage from repeated cycling.

Key Features

• M2.5 thread size engineered for indexable insert clamping pockets in boring toolholders
• T7 Torx drive reduces cam-out risk compared to hex drives at small fastener sizes
• 7.50 mm overall length fits compact boring tool screw pockets without protrusion
• Compatible with both CCMT and TCMT insert families across multiple geometry codes
• Lightweight at 0.01 pounds, stocked in minimum quantities of 5 per order

Compatibility

Confirmed compatible inserts include: CCMT 061615C2P, CCMT 061615TTP, CCMT 061620C2G, CCMT 063115C2P, CCMT 063115TTP, TCMT 110815TTP, TCMT 110823TEG, TCMT 111600ASP, TCMT 111600C2G, TCMT 111600C2P, TCMT 111600PCD, TCMT 111615C2P, TCMT 111615C7P, TCMT 111615CMP, TCMT 111615CTP, and TCMT 111615SNG. Applicable inscribed circle sizes are 0.218 inches and 0.250 inches.

Installation Notes

Installation is performed by machinists or tool crib personnel using a calibrated T7 Torx driver or torque screwdriver. Always power down and lock out the machine spindle before seating or removing insert screws. Inspect the screw threads and Torx socket for wear before each insert change, as a damaged screw can allow insert movement under cutting load. Do not substitute a metric hex screw of similar head diameter, as thread engagement and clamping geometry differ.