Value Collection JY9039702 Straight Flute Tap 1-20 Unef Hss

Product Description

The VALUE COLLECTION JY9039702 is a straight flute tap designed to cut internal 1-20 UNEF threads in a left-hand direction. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers consistent thread form in a range of ferrous and non-ferrous materials. The plug chamfer style provides a gradual lead-in, distributing cutting forces across several threads for controlled engagement. With a thread length of 2.5 inches and an overall length of 5.125 inches, it is sized for through-hole and moderately deep blind-hole applications where straight flute geometry is appropriate.

This tap is suited for machine shop, maintenance, and tool-room applications where left-hand 1-20 UNEF threads are required. Left-hand threads are commonly used in assemblies where rotation of the fastener under load would otherwise loosen a right-hand thread. The 4-flute straight flute configuration provides good chip control in short-chipping materials. Machinists, toolmakers, and industrial maintenance technicians are the primary users of this tap.

Key Features

• 1-20 UNEF thread form with left-hand thread direction for specialty fastening applications
• High-speed steel construction provides hardness and wear resistance for threading operations
• Plug chamfer with gradual lead-in distributes cutting load across multiple thread starts
• 4-flute straight flute design supports chip evacuation in short-chipping materials
• Bright, uncoated finish — no coolant-through requirement
• H4 thread limit for close tolerance thread production

Compatibility

Designed for use in standard tap holders and tapping attachments that accept the shank diameter appropriate for a 1-inch nominal tap; verify machine taper or straight shank compatibility with your toolholder before use.

Installation Notes

Installation and use of this tap should be performed by a qualified machinist or toolmaker familiar with tapping feeds, speeds, and cutting fluid selection for the workpiece material. Secure the workpiece firmly and ensure the tap is aligned perpendicular to the hole axis before engagement. Power down and lock out any machine tool before changing or inspecting the tap. Do not exceed the recommended feed rate for the material being threaded, as HSS taps are susceptible to breakage under excessive torque or misalignment.