Hertel Ets 4-40 Insert Holding Screw Torx Drive

Product Description

The HERTEL ETS 4-40 is a Torx drive insert holding screw designed to secure indexable cutting inserts in toolholders used for boring bar and turning applications. This screw provides reliable clamping force to keep inserts seated and positioned accurately during machining operations. It is compatible with specific insert geometries and toolholder styles, making it a direct-fit fastener for tooling setups in production and job shop environments. Licensed machinists, CNC operators, and toolroom technicians are the primary users of this component.

The ETS 4-40 is suited for use in C Series and Trigon G Series toolholder configurations. It is specified for insert inscribed circle sizes of 0.25 inches and 0.375 inches, covering common triangular and trigon insert families including TD6P and TP series designations. This screw is a standard hardware item within indexable tooling assemblies and is typically stocked in multiples to support ongoing insert changes across a fleet of toolholders.

Key Features

• Torx drive design for positive engagement and reduced cam-out during tightening
• Compatible with C Series and Trigon G Series toolholder styles
• Fits insert inscribed circle sizes of 0.25 inches and 0.375 inches
• Designed for use with TD6P and TP series indexable insert families
• Functions as a direct-fit insert holding screw for boring bar applications
• Minimum order quantity of 10 units supports bulk toolroom stocking

Compatibility

Compatible with C Series and Trigon G Series toolholder styles. Fits indexable inserts in the TD6P and TP series families with inscribed circle sizes of 0.25 inches and 0.375 inches, including complete insert compatibility designations TD6P.., TP..2.., and TP..32.

Installation Notes

Insert holding screws should be installed and torqued by a qualified machinist or toolroom technician using a calibrated Torx key of the appropriate size. Always index or replace the cutting insert with the machine powered down and the spindle fully stopped. Do not overtighten, as this can strip the screw threads or damage the toolholder pocket. Replace the screw if thread wear, corrosion, or deformation is observed.