Taps & Dies

Popular Special Taps (Inches)

WESTport stocks one of the industry's largest inventories of Popular Special Inch Taps. Custom manufactured to your blueprint or sample with fast turnaround for production, maintenance, and OEM applications.

Why WESTport?

  • Custom-ground to your exact specs
  • All thread standards: UNC, Metric, NPT, ACME, API
  • HSS, Cobalt, Powder Metal, Carbide options
  • Made in USA — 30+ years of precision manufacturing
  • Same-day quoting on standard requests
  • Matched tap & die sets available
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Call for Quote

To order, contact us with the part number and your desired quantity.

Size
Style
Chamfer

Part #:31187

Features

  • One of the industry's largest inventories of tap blanks
  • Fast turnaround on custom special taps
  • Manufactured from customer blueprints or samples
  • Precision-ground thread geometry
  • High-Speed Steel (HSS), cobalt, and powdered metal options
  • Standard and modified inch thread sizes
  • Premium wear-resistant coatings available
  • CNC and manual machining applications
  • Prototype through production quantities
More Details View full details

Available Sizes & Part Numbers

SizeStyleChamferSKUPrice
1/2-14 NPT 15º SPIRAL 4FL TAP Default 36553 Call for Quote
1/2-14 NPT 6 OAL 4FL TAP Default 36554 Call for Quote
1/2-14 NPT 8 OAL 4FL TAP Default 36556 Call for Quote
1/2-16 H3 4FL TAP Plug 36073 Call for Quote
1/2-16 H3 4FL TAP Bottom 36074 Call for Quote
1/2-16 H3 4FL TAP Taper 36072 Call for Quote
1/2-18 H3 4FL TAP Plug 36576 Call for Quote
1/2-18 H3 4FL TAP Bottom 36577 Call for Quote
1/2-18 H3 4FL TAP Taper 36575 Call for Quote
1/2-20 H3 4FL LH TAP Plug 31368 Call for Quote
1/2-20 H3 4FL LH TAP Bottom 31369 Call for Quote
1/2-20 H3 4FL LH TAP Taper 31367 Call for Quote
1/2-20 +.003 4FL TAP Plug 36579 Call for Quote
1/2-20 +.003 4FL TAP Bottom 36580 Call for Quote
1/2-20 +.003 4FL TAP Taper 36578 Call for Quote
1/2-20 +.005 4FL TAP Plug 36582 Call for Quote
1/2-20 +.005 4FL TAP Bottom 36583 Call for Quote
1/2-20 +.005 4FL TAP Taper 36581 Call for Quote
1/2-20 H3 3FL STI SPPT TAP Default 31232 Call for Quote
1/2-20 H3 4FL 6 OAL TAP Plug 36586 Call for Quote
1/2-20 H3 4FL 6 OAL TAP Bottom 36587 Call for Quote
1/2-20 H3 4FL 6 OAL TAP Taper 36585 Call for Quote
1/2-20 H3 4FL CARBIDE TAP Plug 38270 Call for Quote
1/2-20 H3 4FL CARBIDE TAP Bottom 38271 Call for Quote
1/2-20 H3 4FL CARBIDE TAP Taper 38269 Call for Quote
1/2-20 H3 4FL STI TAP Plug 31103 Call for Quote
1/2-20 H3 4FL STI TAP Bottom 31104 Call for Quote
1/2-20 H4 3FL STI SPPT TAP Default 31233 Call for Quote
1/2-20 H4 4FL STI TAP Plug 31105 Call for Quote
1/2-20 H4 4FL STI TAP Bottom 31106 Call for Quote
1/2-20 +.005 3FL SPPT TAP Default 36584 Call for Quote
1/2-20 H3 3FL 6 OAL SPPT Default 36588 Call for Quote
1/2-24 H3 4FL TAP Plug 36077 Call for Quote
1/2-24 H3 4FL TAP Bottom 36078 Call for Quote
1/2-24 H3 4FL TAP Taper 36076 Call for Quote
1/2-27 H3 4FL TAP Plug 36593 Call for Quote
1/2-27 H3 4FL TAP Bottom 36594 Call for Quote
1/2-27 H3 4FL TAP Taper 36592 Call for Quote
1/2-28 H3 4FL TAP Plug 31250 Call for Quote
1/2-28 H3 4FL TAP Bottom 31251 Call for Quote
1/2-28 H3 4FL TAP Taper 31249 Call for Quote
1/2-28 H3 3FL SPPT TAP Default 36595 Call for Quote
1/2-32 H3 6FL TAP Plug 36081 Call for Quote
1/2-32 H3 6FL TAP Bottom 36082 Call for Quote
1/2-32 H3 6FL TAP Taper 36080 Call for Quote
1/2-40 H2 6FL TAP Plug 36085 Call for Quote
1/2-40 H2 6FL TAP Bottom 36086 Call for Quote
1/2-40 H2 6FL TAP Taper 36084 Call for Quote
9/16-12 H3 4FL LH TAP Plug 31371 Call for Quote
9/16-12 H3 4FL LH TAP Bottom 31372 Call for Quote
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Product Details

WESTport's Popular Special Taps – Inches are designed to provide manufacturers with quick access to many of the most frequently requested non-standard inch thread sizes while maintaining the flexibility to produce fully custom tooling when required. Unlike standard catalog taps, these special taps are available in popular inch sizes, pitches, and configurations that are commonly requested by machine shops, OEMs, maintenance departments, repair facilities, and production manufacturers. WESTport maintains one of the industry's largest inventories of tap and die blanks, allowing for exceptionally fast turnaround on custom specials manufactured from your blueprint or sample.

Every WESTport Popular Special Inch Tap is precision manufactured using premium High-Speed Steel (HSS), cobalt, powdered metal, or other high-performance tool materials selected to match the application. Precision grinding produces highly accurate thread geometry, smooth cutting performance, and excellent dimensional consistency throughout the life of the tool. Whether your application requires a modified pitch, special diameter, custom chamfer, unique thread length, oversize limits, or another engineering modification, WESTport's manufacturing capabilities allow us to produce tooling tailored specifically to your requirements.

These taps are widely used across aerospace, automotive, defense, heavy equipment, hydraulic systems, energy, medical manufacturing, industrial machinery, and general machining operations. By maintaining a large inventory of tap blanks and utilizing efficient manufacturing processes, WESTport helps customers reduce downtime caused by long lead times while ensuring the precision required for demanding thread-cutting applications.

Whether you require a single replacement tap, prototype tooling, or production quantities, WESTport works directly with customers to provide dependable thread-cutting solutions backed by technical expertise and responsive customer support. Since 1989, WESTport has supplied precision quality assurance products and custom manufacturing solutions to customers throughout North America and worldwide.

Benefits

  • Faster delivery than typical custom tooling
  • Accurate, repeatable internal threads
  • Excellent dimensional consistency
  • Reduced production downtime
  • Long tool life
  • Custom-engineered solutions for difficult applications
  • Reliable performance across a wide variety of materials
  • Supported by experienced technical assistance

Typical Applications

  • Aerospace manufacturing
  • Automotive components
  • Industrial machinery
  • Hydraulic equipment
  • Oil and gas equipment
  • Tool and die manufacturing
  • Maintenance and repair operations
  • OEM production
  • Precision machine shops
  • General industrial manufacturing

Technical Information

WESTport Popular Special Inch Taps are manufactured for many of the most commonly requested non-standard inch thread sizes and pitches. When a standard configuration is not available, WESTport can manufacture custom taps directly from customer blueprints or sample parts. This capability allows manufacturers to obtain precision tooling for both legacy equipment and newly engineered components while minimizing production delays.

Why Choose WESTport?

Since 1989, WESTport has been a trusted supplier of precision thread gages, metrology equipment, hardness testing products, calibration services, and custom threading solutions. Our extensive inventory of tap blanks, precision manufacturing capabilities, and commitment to customer service enable us to deliver high-quality custom inch taps with exceptional turnaround times. Whether your requirement involves a single prototype or a large production order, WESTport provides the precision, reliability, and technical expertise manufacturers have depended on for more than 35 years.

Have a Custom or Special Application?

Need a tap or die ground to a non-standard spec, print, or unique thread form? Submit a custom quote request and our engineering team will review it.

Request a Custom Quote