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
3/8-12 RH 2G ACME TANDEM 4FL Default 37089 Call for Quote
3/8-16 H3 4FL LH TAP Plug 31353 Call for Quote
3/8-16 H3 4FL LH TAP Bottom 31354 Call for Quote
3/8-16 H3 4FL LH TAP Taper 31352 Call for Quote
3/8-16 +.003 4FL TAP Plug 36456 Call for Quote
3/8-16 +.003 4FL TAP Bottom 36457 Call for Quote
3/8-16 +.003 4FL TAP Taper 36455 Call for Quote
3/8-16 +.005 4FL TAP Plug 36460 Call for Quote
3/8-16 +.005 4FL TAP Bottom 36461 Call for Quote
3/8-16 +.005 4FL TAP Taper 36459 Call for Quote
3/8-16 +.010 4FL TAP Plug 36464 Call for Quote
3/8-16 +.010 4FL TAP Bottom 36465 Call for Quote
3/8-16 +.010 4FL TAP Taper 36463 Call for Quote
3/8-16 H3 3FL STI SPPT TAP Default 31222 Call for Quote
3/8-16 H3 4FL 6 OAL TAP Plug 36470 Call for Quote
3/8-16 H3 4FL 6 OAL TAP Bottom 36471 Call for Quote
3/8-16 H3 4FL 6 OAL TAP Taper 36469 Call for Quote
3/8-16 H3 4FL 8 OAL TAP Plug 36474 Call for Quote
3/8-16 H3 4FL 8 OAL TAP Bottom 36475 Call for Quote
3/8-16 H3 4FL 8 OAL TAP Taper 36473 Call for Quote
3/8-16 H3 4FL CARBIDE TAP Plug 38255 Call for Quote
3/8-16 H3 4FL CARBIDE TAP Bottom 38256 Call for Quote
3/8-16 H3 4FL CARBIDE TAP Taper 38254 Call for Quote
3/8-16 H3 4FL DBLD TAP Plug 36467 Call for Quote
3/8-16 H3 4FL DBLD TAP Bottom 36468 Call for Quote
3/8-16 H3 4FL DBLD TAP Taper 36466 Call for Quote
3/8-16 H3 4FL STI TAP Plug 31083 Call for Quote
3/8-16 H3 4FL STI TAP Bottom 31084 Call for Quote
3/8-16 +.003 3FL SPPT Default 36458 Call for Quote
3/8-16 +.005 3FL SPPT Default 36462 Call for Quote
3/8-16 H3 3FL 6 OAL SMSH SP PL Default 36472 Call for Quote
3/8-16 H3 3FL CARBIDE SPPT Default 38237 Call for Quote
3/8-16 H3 4FL 10 OAL TAP Plug 36477 Call for Quote
3/8-16 H3 4FL 10 OAL TAP Bottom 36478 Call for Quote
3/8-16 H3 4FL 10 OAL TAP Taper 36476 Call for Quote
3/8-16 H4 3FL STI SPPT TAP Default 31223 Call for Quote
3/8-16 H4 4FL STI TAP Plug 31085 Call for Quote
3/8-16 H4 4FL STI TAP Bottom 31086 Call for Quote
3/8-18 H3 4FL TAP Plug 36033 Call for Quote
3/8-18 H3 4FL TAP Bottom 36034 Call for Quote
3/8-18 H3 4FL TAP Taper 36032 Call for Quote
3/8-18 NPT 4FL TAP Default 62124 Call for Quote
3/8-18 NPT LH TAP Default 31309 Call for Quote
3/8-19 55 DEGREE MOD BSPP RH Default 31539 Call for Quote
3/8-19 55 DEGREE MOD BSPT RH Default 31530 Call for Quote
3/8-20 H3 4FL TAP Plug 36037 Call for Quote
3/8-20 H3 4FL TAP Bottom 36038 Call for Quote
3/8-20 H3 4FL TAP Taper 36036 Call for Quote
3/8-24 H3 4FL LH TAP Plug 31356 Call for Quote
3/8-24 H3 4FL LH TAP Bottom 31357 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