Value Collection MSC-04489431 Tap Set 1-1/4-7 Unc Hss

Product Description

The VALUE COLLECTION MSC-04489431 is a 3-piece tap set designed for cutting 1-1/4-7 UNC internal threads in metal workpieces. Each tap in the set features a 4-flute geometry and is manufactured from high-speed steel (HSS), providing the hardness and wear resistance needed for production threading in steel, cast iron, and similar ferrous materials. The bright, uncoated finish suits general-purpose threading applications where a coating is not required. Overall length is 5.75 inches with a thread length of 2.5625 inches and an H4 thread limit for close-tolerance fits. This set is used by machinists, pipefitters, maintenance technicians, and trade professionals performing heavy threading work.

This tap set is suited for threading large-diameter holes in structural steel, machinery components, pipe flanges, and heavy equipment frames. The 1-1/4-7 UNC coarse thread profile is a common standard for large fastener applications in industrial and mechanical assembly. Right-hand thread direction matches conventional fastener orientation. The 3-piece configuration typically includes taper, plug, and bottoming taps, allowing the user to start, continue, and finish threads in through-holes or blind holes without changing tool types.

Key Features

• 1-1/4-7 UNC coarse thread form for large-diameter internal threading
• 4-flute design supports efficient chip evacuation during threading
• High-speed steel construction delivers durability in ferrous and general-purpose metals
• H4 thread limit provides close-tolerance thread fit
• Bright, uncoated finish suitable for general-purpose and lubricated threading operations
• Right-hand thread direction; 5.75-inch overall length with 2.5625-inch thread length

Compatibility

Designed as a general-purpose replacement or supplemental tap set for applications requiring 1-1/4-7 UNC right-hand internal threads in ferrous and comparable materials.

Installation Notes

Tap installation should be performed by a qualified machinist or trades professional using a properly sized tap wrench or machine tapping setup. Always secure the workpiece before threading and apply an appropriate cutting fluid to extend tool life and improve thread quality. Ensure the tap is started square to the hole to prevent cross-threading or tap breakage. Remove chips regularly during tapping, especially in blind-hole applications.