Greenfield Threading, Straight Flute Hand Tap, Bright, HSS, 1/4-28NF HTGP H3 4FL GP

The Greenfield Threading Straight Flute Hand Tap, model HTGP, is a high-speed steel (HSS) threading tool designed for precision and durability. Featuring a 1/4"-28 UNF thread size, it is ideal for cutting threads in materials such as cast iron (K), stainless steel (M), non-ferrous metals like aluminum (N), and steel (P).

This hand tap has a bright finish, ensuring smooth chip removal and reducing material buildup during threading. Its 4-flute straight flute design allows for efficient cutting in through or blind holes. The tap includes a bottoming chamfer, suitable for applications requiring threads close to the bottom of a hole, and complies with USCTI Table 302 standards for construction and quality.

With a thread pitch of 28 and a tap limit of H3, it offers precise thread tolerances for 2B class fits. The overall length measures 2.5000" (63.50mm), with a 1.0000" (25.40mm) thread length, providing reliable reach and engagement. The straight shank, measuring 0.2550" (6.48mm) with a square end feature, ensures a secure grip and compatibility with standard tap wrenches.

Capable of achieving a depth of cut up to 2xD, this versatile hand tap is a reliable choice for general-purpose threading tasks across various material types.