Irwin 1911ZR Bsp Pipe Tap 1/8-28 Bspt 4 Flute

Product Description

The IRWIN 1911ZR is a straight-flute British Standard Pipe Taper tap designed for cutting internal BSPT threads in pipe fittings, valves, and threaded port connections. Built from carbon steel with a bright, uncoated finish, this tap cuts a 1/8-28 BSPT thread profile using a right-hand, plug-chamfer geometry across four flutes. The plug chamfer provides a gradual thread lead-in suitable for through-hole and moderate-depth blind-hole applications. It is a standard tool for plumbers, pipefitters, and machinists working on low-pressure pipe systems that require British Standard tapered thread connections.

This tap is suited for residential and light commercial plumbing, instrumentation, and pneumatic applications where BSPT threaded fittings are specified. The 1/8-28 size is commonly encountered in small-diameter pipe connections, sensor ports, and hydraulic or pneumatic manifold work. Because BSPT is a tapered thread standard used widely in international plumbing and fluid-power systems, this tap sees regular use in service and repair work on imported equipment as well as new fabrication requiring metric-adjacent thread forms.

Key Features

• 1/8-28 BSPT thread size for British Standard tapered pipe connections
• 4-flute straight-flute design for controlled chip evacuation in ferrous and non-ferrous materials
• Plug chamfer provides gradual thread engagement, reducing tap breakage risk
• Right-hand thread direction for standard clockwise tapping operation
• Carbon steel construction offers adequate hardness for general-purpose pipe tapping
• Bright, uncoated finish suitable for use with standard tapping fluids

Compatibility

Designed for cutting 1/8-28 BSPT internal threads in pipe fittings, valve bodies, manifolds, and threaded ports that require British Standard Pipe Taper thread form.

Installation Notes

Tapping operations should be performed by a qualified plumber, pipefitter, or machinist. Always secure the workpiece before tapping and use an appropriate cutting fluid to extend tap life and improve thread quality. Apply consistent, moderate pressure with periodic back-off strokes to break chips and prevent tap binding or breakage. Verify that the drilled pilot hole matches the correct tap drill diameter for 1/8-28 BSPT before beginning the threading operation.