Osg 1658502008 Bspt Pipe Tap 1/4-19 3 Flute Hss

Product Description

The OSG 1658502008 is a British Standard Pipe Taper (BSPT) hand tap designed for cutting 1/4-19 internal pipe threads in a range of materials. Built from high-speed steel (HSS) with a V-coat finish, this tap delivers clean thread formation in carbon steel, stainless steel, aluminum, and hardened steel. The 3-flute geometry provides good chip clearance in through and blind hole applications. With an overall length of 3.94 inches and a thread length of 0.748 inches, the 1658502008 is sized for standard pipe tap holders and wrenches used by machinists, pipefitters, and plumbing fabricators working to BSP standards.

This tap is intended for applications requiring BSPT tapered threads, commonly found in fluid and gas line fittings, hydraulic components, and pipe assemblies governed by British Standard specifications. The right-hand thread direction suits standard tapping operations on benchtop machines or hand-driven tap wrenches. It is a practical choice for shops and field fabricators cutting pipe threads in metric-adjacent systems, particularly in industrial, marine, and import-equipment repair contexts where BSP thread forms are specified.

Key Features

• Thread size: 1/4-19 BSPT tapered pipe thread form
• High-speed steel construction rated for carbon steel, stainless steel, aluminum, and hardened steel
• 3-flute design for efficient chip evacuation during tapping
• V-coat finish reduces friction and extends tool life
• Right-hand thread direction for use with standard tap wrenches and tapping heads
• No coolant-through requirement — suitable for hand and machine tapping with conventional cutting fluid

Compatibility

Designed for use in standard tap holders and wrenches accepting a 0.56-inch shank diameter with a 0.42-inch square drive. Suitable for cutting 1/4-19 BSPT threads per British Standard Pipe Taper specifications in the listed material types.

Installation Notes

This tap should be installed and operated by a machinist, pipefitter, or qualified tradesperson familiar with thread-cutting procedures. Secure the workpiece fully before tapping, and apply an appropriate cutting fluid for the material being threaded. Start the tap squarely to avoid cross-threading, and back off periodically to break chips. Never force a tap that meets resistance — back out to clear chips before continuing.