Iscar 3800112 Threading Toolholder Internal Left Hand Sil

Product Description

The ISCAR 3800112 is an indexable threading toolholder designed for internal threading operations on CNC lathes and turning centers. Built in a left-hand orientation, it accepts a P 16 insert held in place by a screw-clamp method, delivering repeatable insert positioning for consistent thread form. The shank measures 0.75 inches wide by 0.75 inches tall with a shank length of 6.375 inches and an overall length of 7 inches. Minimum bore diameter is 0.75 inches. This toolholder belongs to ISCARs SIL series and is installed by CNC machinists and tool-room technicians working in production or job-shop threading applications.

This toolholder is suited for internal threading on bore diameters starting at 0.75 inches. The left-hand configuration positions the cutting edge for specific spindle-direction and approach requirements common in Swiss-type, gang-tool, and conventional slant-bed turning setups. The head length and maximum depth of cut are both 1.5 inches, and the back-of-bar to cutting edge measures 0.75 inches, with a center-to-cutting-edge offset of 0.45 inches. No through-coolant or external coolant port is incorporated in this configuration.

Key Features

• Left-hand internal threading configuration for SIL series turning applications
• Screw-clamp insert holding method for secure, repeatable P 16 insert seating
• 0.75 inch minimum bore diameter suits a wide range of internal thread diameters
• 7 inch overall length with 6.375 inch shank length for extended reach into bores
• Square 0.75 x 0.75 inch shank fits standard tool block and quick-change holders
• No coolant-through design simplifies setup where coolant delivery is not required

Compatibility

Designed for use with P 16 series threading inserts in ISCAR SIL series internal threading toolholder applications. Verify insert inscribed circle size of 3/8 inch when selecting replacement inserts.

Installation Notes

Installation is performed by qualified CNC machinists or toolroom technicians. Secure the shank in a compatible tool block or turret station rated for a 0.75 x 0.75 inch shank before powering the machine. Confirm spindle direction and tool orientation match the left-hand designation before running. Torque the insert clamping screw to the insert manufacturers specification using the correct Torx or hex key; do not overtighten.