Iscar 4390045 Insert Screw Indexable Milling T490 Sm

Product Description

The ISCAR 4390045 is an insert screw designed to secure indexable inserts in milling toolholders. This small but critical fastener keeps cutting inserts locked in position during milling operations, maintaining edge geometry and preventing insert movement under cutting loads. It belongs to the Helitang series and is compatible with T490 SM toolholder styles. Installation requires a BLD T15/S7 key or driver. The part weighs approximately 0.01 pounds, reflecting its compact form factor. Licensed machinists and toolroom technicians are the primary users of this hardware during insert changeovers on milling setups.

This insert screw is used in indexable milling applications where T490 SM style toolholders are in service. It is a direct replacement screw for maintaining toolholder hardware on Helitang series milling bodies. Typical install scenarios include production floor insert changes, toolholder refurbishment, and preventive hardware replacement to avoid screw wear-related insert seating failures. It is sold individually but must be ordered in multiples of 10.

Key Features

• Fits T490 SM toolholder style for indexable milling applications
• Part of the Helitang series insert hardware line
• Requires BLD T15/S7 key or driver for installation and removal
• Secures indexable inserts including T490 LNAR and T490 LNHT and T490 LNMT insert families
• Minimum order quantity of 10 units supports bulk toolroom stocking

Compatibility

Compatible with the following indexable inserts: T490 LNAR 1306PN-R, T490 LNAR 1306PN-R-P, T490 LNHT 1306PN-R PL, T490 LNHT 1306PNTL, T490 LNHT 1306PNTR, T490 LNMT 1306PNTR, and T490 LNMT 1306PNTR-CS. Designed for use with T490 SM style toolholders in the Helitang series.

Installation Notes

Installation and removal should be performed with the machine powered off and the spindle fully stopped. Use only the specified BLD T15/S7 key or driver to avoid stripping the screw head. Inspect the screw threads and toolholder pocket threads for wear or damage before reinstalling an insert. Worn or cross-threaded insert screws should be replaced rather than reused, as a loose screw can cause insert ejection during a cut.