Parlec S20-77TA2 Tapping Chuck 2 in Straight Shank

Product Description

The PARLEC S20-77TA2 is a tension-compression tapping chuck designed for precision thread-tapping operations on machining centers and CNC equipment. It features a 2 inch straight shank for direct spindle mounting and accommodates a tap capacity range from M3.5 (No. 6) to M36 (1-5/8 inches), making it suitable for a wide range of threading work in production and job-shop environments. The 2.75 inch projection positions the tap at the correct working depth without interference. Tension travel measures 0.56 inches and compression range spans 0.00 to 0.25 inches, allowing the chuck to compensate for minor feed-rate variation and protect taps during the cut.

This tapping chuck is used in vertical and horizontal machining center setups where rigid or floating tap holders are required for threaded-hole production. It handles both standard and pipe tap applications, with a maximum pipe tap capacity of 1-1/4 inches and a minimum pipe tap capacity of 1/16 inch. It is suited for general metalworking, mold-and-die, and production machining environments where repeatable, damage-free tapping is a priority. Machinists and CNC tool-setup technicians are the primary users of this toolholder.

Key Features

• Tension-compression float compensates for minor spindle feed mismatch, extending tap life
• 2 inch straight shank for direct machine spindle mounting
• Wide tap capacity range: M3.5 to M36 (No. 6 to 1-5/8 inches)
• 2.75 inch projection provides clearance for most standard workpiece setups
• Pipe tap capacity from 1/16 inch to 1-1/4 inches
• Non-quick-change design for secure, stable toolholder retention

Compatibility

Designed as an OEM-style tapping chuck for use with machining center spindles accepting a 2 inch straight shank modular toolholder connection.

Installation Notes

Installation and tool changes should be performed by a qualified CNC machinist or toolroom technician with the machine spindle fully powered down and the tool-change interlock engaged. Follow the machine tool builder guidelines for drawbar torque and shank seating when mounting straight-shank toolholders. Verify tap adapter collet retention and axial float travel before running the first part. Inspect tension-compression mechanism for free movement prior to each setup.