8140 Fractional Tap, 7/16-20 NF Thread, 4-Flute HCS

The Irwin 8140 fractional tap is a hand threading tool designed for routine maintenance, repair work, and rethreading applications where high accuracy and tight tolerance are not critical. This tap features a solid high carbon steel (HCS) construction that withstands heavy-duty threading tasks in a wide variety of materials. The 7/16-20 National Fine thread size makes it ideal for creating consistent fine threads across many projects and materials.

With four straight flutes ground specifically for rapid chip removal, this tap delivers efficient threading action. The straight flute design is optimized for hand threading work in various materials. Whether you are restoring threads on existing fasteners, preparing new holes, or performing general maintenance, this fractional tap produces a Class 2B thread suitable for non-critical applications.

Features and Benefits

• Straight Flute Design: Four flutes are ground to provide rapid chip evacuation, enabling efficient threading action.
• High Carbon Steel Construction: Solid HCS material delivers durability and reliability for heavy-duty hand threading work.
• 7/16-20 National Fine Thread: This fractional size is widely used for routine maintenance and rethreading in many applications.
• Class 2B Thread Production: Produces standard Class 2B threads suitable for non-critical applications where precision fit is not essential.
• Hand Threading Optimized: Designed specifically for hand operation across various materials.

Specifications

• Brand: Irwin
• Model: 8140
• Thread Size: 7/16-20 National Fine (NF)
• Flutes: 4 straight flutes
• Material: High Carbon Steel (HCS)
• Thread Class: 2B
• Recommended Drill Bit: 25/64 inch
• Type: Plug tap

How to Use

Prepare the hole using a 25/64 inch drill bit for optimal hole preparation before tapping.