MACHINE TAP Series 101 Size Chart

Order by Item from our size chart below, by SET SKU or customize your own set.

Always in STOCK!  Ships Same-Day PST!

Use any standard machine (ANSI) or Pipe (npt) Tap and/or Metric conversion, provided the tap square and tap shank dimensions match with our stock sizes published below.


Each Extension is precision machined in America (using only USA steel sources) and guaranteed against defects in material and workmanship.  Why Its Different.


Available in 2", 4", 6", 8" and 12" lengths and now offering 2-1/2", 3", 3-1/2", 5" and 7" lengths in select tap sizes shown below. Customize a set by individual sizes and lengths or choose for our SET SKU below.

Important: Self-Locking feature requires the dimensions of your Tap Square and Shank match with the Size Chart Dims indicated for the Tap Shank (B) and Square (C) Accepted.

Why it's different - Tap Associates





Ext Length

Order #





Max Extension DIA


Max Tap Shank Accepted


Max Tap Square Accepted


Length of Sm Shank Ext. 


Did of SM Shank Ext.


SQ Shnk of Extension


ANSI (metric) TAP SETs 

Purchase individually, by SET SKU or customize your own set.  Contact your Distributor or select from our Roster for a QUOTE


Set Includes Tap Sizes 

Extension Length


P.O. Box 1405 Yerington, NV 89447

  • Twitter - White Circle
  • YouTube - White Circle



1-888-605-5222 FAX

M-F Open 7am - Pacific

© 2009-2018 Tap Associates, Inc.     Web Site Terms and Conditions

Accessibility Statement

Tap extension, Smallest OD, ANSI, Metric, Long Tapping, self-locking, threaded tap, tap extensions, hand tapping, threading, Close tapping