Walter-prototyp 7427638 Thread Forming Tap 10-24 Unc

Product Description

The WALTER-PROTOTYP 7427638 is a thread forming tap designed for cutting 10-24 UNC internal threads in blind holes and through-holes. Part of the TC410 Advance series, it forms threads by displacing material rather than cutting chips, which produces stronger thread walls and eliminates chip-related tap breakage. The tap is manufactured from High-Speed Steel-E (HSS-E) and carries a Titanium Nitride (TiN) coating that reduces friction and extends tool life in production environments. The 2BX class of fit delivers the thread tolerance required for fastener engagement in precision assemblies. Overall length is 2.756 inches with a 0.512-inch thread length and a tapping depth of 0.984 inches.

The 7427638 is suited for machine tapping operations in both blind-hole and through-hole configurations on ferrous metals, cast irons, non-ferrous alloys, and certain exotic materials, consistent with its P, M, K, N, and S material application codes. The modified bottoming chamfer with 2-3 chamfered threads allows threading close to the bottom of blind holes, making it a practical choice for tight-tolerance machined components in general manufacturing, toolroom work, and production environments where a semi-bottoming tap is required.

Key Features

• Thread forming (chipless) design strengthens thread walls by cold-forming material
• TiN coating reduces friction and increases wear resistance for extended tool life
• Modified bottoming chamfer with 2-3 chamfered threads for threading near the bottom of blind holes
• HSS-E construction provides toughness for a wide range of workpiece materials
• 5 oil grooves support lubrication distribution during forming operations
• No coolant-through design - suitable for standard tapping with cutting fluid applied externally

Compatibility

Designed for use in 10-24 UNC applications across material groups P, M, K, N, and S, including steels, stainless steels, cast irons, non-ferrous alloys, and high-temperature alloys, in both blind-hole and through-hole threading operations.

Installation Notes

Thread forming taps must be installed in a rigid tapping holder or a synchronized tapping attachment to prevent axial force mismatch that can cause tap failure. Ensure the correct pilot hole diameter for form tapping is used, as the required hole size differs from cut tapping and is specified by the tap manufacturer for the given material and class of fit. Apply appropriate tapping fluid or cutting oil before and during the operation. Power down the machine and secure the workpiece before changing or inspecting the tap.