Iscar 3800027 Threading Toolholder 3/4 X 3/4 Inch Shank

Product Description

The ISCAR 3800027 is an external, right-hand indexable threading toolholder designed for precision thread-cutting operations on CNC lathes and manual turning machines. Built to the SER series standard, it accepts a K 16 insert with a 3/8-inch inscribed circle, held securely in place by a screw clamping mechanism. The shank measures 3/4 inch wide by 3/4 inch tall and runs 5 inches in overall length. This toolholder is intended for machinists and tooling technicians performing external threading passes on ferrous and non-ferrous workpieces. It does not include through-coolant capability.

The 3800027 is suited for external threading applications in production and job-shop turning environments. Its right-hand cutting orientation makes it compatible with standard lathe spindle rotation when threading toward the chuck. The 3/4 x 3/4 inch shank fits common tool post and turret block configurations found on mid-size CNC and manual lathes. No coolant supply lines are required at the toolholder, simplifying setup. This holder is intended for single-point threading operations where repeatable insert indexing and rigid clamping are essential for consistent thread form and dimensional accuracy.

Key Features

• External threading geometry, right-hand cut orientation
• SER series toolholder style for standardized insert compatibility
• Screw-clamp insert holding method for positive, repeatable seating of K 16 inserts
• 3/4 x 3/4 inch square shank fits standard tool post and turret blocks
• 5-inch overall length provides rigidity and clearance in typical lathe setups
• No through-coolant required, reducing setup complexity

Compatibility

Designed for use with K 16 threading inserts with a 3/8-inch inscribed circle, held by screw clamping. Compatible with tool posts and turret blocks accepting a 3/4 x 3/4 inch square shank.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the lathe spindle before mounting or indexing inserts. Seat the toolholder fully in the tool post or turret block and verify shank clamping torque per the machine manufacturer's specification before cutting. Inspect insert seating and clamping screw condition at each index to maintain thread form accuracy.