Seco 00018930 Differential Screw 5/16-24 Thread Indexable

Product Description

The SECO 00018930 is a differential screw designed for indexable turning toolholders. It uses a 5/16-24 thread and features opposing right-hand and left-hand thread sections that work together to draw and lock cutting inserts securely in place during turning operations. The overall length is 1.25 inches, with each threaded section measuring 0.50 inches. This type of fastener is a consumable component in precision turning setups and is typically replaced by CNC machinists and toolroom technicians during insert changes or when thread wear affects clamping force.

This differential screw is intended for use in indexable turning applications where precise insert clamping is critical to surface finish and dimensional accuracy. It is compatible with MTFN-style toolholders and works with clamp hardware designated CL-12. Typical installation environments include CNC turning centers and manual lathes running TNMG 543 inserts. This screw is sold individually per package, with a minimum order quantity of 10 units, making it suitable for stocking in toolcrib or maintenance inventory.

Key Features

• 5/16-24 thread size for use with MTFN-style indexable turning toolholders
• Dual opposing thread design: 0.50-inch right-hand thread and 0.50-inch left-hand thread for differential clamping action
• Overall length of 1.25 inches for compact fitment in standard turning toolholder pockets
• Compatible with CL-12 clamp hardware and TNMG 543 inserts
• Sold per unit with a minimum order quantity of 10, suitable for toolcrib stocking

Compatibility

Compatible with MTFN-style indexable turning toolholders, CL-12 clamp hardware, and TNMG 543 cutting inserts. Industry standard number 18930.

Installation Notes

Installation is performed by machinists or toolroom technicians during routine insert indexing or replacement. Always ensure the toolholder pocket and clamp seating surfaces are clean and free of chips before installing a new differential screw. Use the correct torque driver or hex key specified by the toolholder manufacturer to avoid stripping the thread. Do not substitute standard single-thread screws in differential-screw toolholder designs, as this will result in improper clamping force.