USCTI Table 303-A defines dimensional standards for special extension taps used in deep-hole threading. Learn specs, applications, and custom options from Taylor Tool.
Posts from September, 2026
USCTI Table 352 Basic Thread Dimensions Guide
Complete guide to USCTI Table 352 basic thread dimensions. Learn how to read the standard, apply tolerances, and select the right tap for your threading application.
Special Acme Taps: Custom Manufacturing & Specifications
Special Acme taps for trapezoidal threads. Taylor Tool manufactures custom Acme taps to your exact specification since 1918. Fast delivery across North America.
Special Trapezoidal Taps | Custom Thread Forms | Taylor Tool
Special trapezoidal taps manufactured to your exact specification by Taylor Tool. Custom Tr, ACME, and metric trapezoidal thread taps since 1918. Fast delivery.
Special Purpose Taps: Types & Custom Threading Solutions
Discover special purpose taps for custom threading: Acme, trapezoidal, buttress, BSPT, BSPP, PG, multi-lead, and oversized threads. Custom manufacturing since 1918.
API Pipe Taps: Custom Oil & Gas Threading Tools | Taylor Tool
Taylor Tool manufactures custom API specification pipe taps for oil and gas threading. Canadian-made precision taps for BSPT, BSPP, and specialty pipe threads since 1918.
Quantum Taps: Advanced Thread Forming Technology for US Industry
Quantum taps use roll-forming technology for stronger threads in industrial applications. Taylor Tool manufactures quantum roll form taps for US aerospace, automotive, and manufacturing sectors.
Taper pipe tap thread limits and dimensions (USCTI Table 338)
Thread limits, projection tolerances, taper per foot limits, L1 lengths and tap drill sizes for NPT, ANPT and NPTF ground thread taper pipe taps from 1/16 to 4 inch.
Eccentricity tolerances of tap elements (USCTI Table 317)
USCTI Table 317 eccentricity tolerances for tap elements tested on dead centers. Covers square, shank, major diameter, pitch diameter, and chamfer for inch, pipe, and metric taps.
Optional neck and shortened thread tap dimensions (USCTI 302-A)
USCTI Table 302-A dimensions for ground thread taps with optional neck and shortened thread length, covering machine screw sizes #4 through 1 inch and metric M3 through M25.