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TRU-POS - HELI-COIL - Tapped Hole Location Gages (Inch)

TRU-POS - HELI-COIL - Tapped Hole Location Gages (Inch)

Starting at $130.00

The Most Accurate and Efficient Way to Measure the True Position of a Tapped Hole

  • Designed to be used BEFORE the HeliCoil insertion.
  • An essential complement of any CMM Package, TRU-POS™ Locators are the only correct way to determine the true position of tapped holes. 
  • ANSI specifies, "Each tolerance of orientation or position and datum reference specified for a screw thread applies to the axis of the thread derived from the pitch cylinder.” 
  • Complies with ANSI Y14.5M-1994 and meets correct geometric tolerances every time.

Some items may have Limited Quantity or may no longer be available and will therefore require a special quote

Additional Information +
Click here for METRIC sizes
Item No. THREAD SIZE Type Our Price QTY
HTP0256 2 - 56 UNC - (HTP0256) Helicoil $135.00
HTP0348 3 - 48 UNC - (HTP0348) Helicoil $135.00
HTP0440 4 - 40 UNC - (HTP0440) Helicoil $135.00
HTP0632 6 - 32 UNC - (HTP0632) Helicoil $135.00
HTP0640 6 - 40 UNF - (HTP0640) Helicoil $180.00
HTP0832 8 - 32 UNC - (HTP0832) Helicoil $135.00
HTP0836 8 - 36 UNF - (HTP0836) Helicoil $135.00
HTP1024 10 - 24 UNC - (HTP1024) Helicoil $135.00
HTP1032 10 - 32 UNF - (HTP1032) Helicoil $130.00
HTP2520 1/4 - 20 UNC - (HTP2520) Helicoil $150.00
HTP2528 1/4 - 28 UNF - (HTP2528) Helicoil $150.00
HTP3118 5/16 - 18 UNC - (HTP3118) Helicoil $150.00
HTP3124 5/16 - 24 UNF - (HTP3124) Helicoil $150.00
HTP3716 3/8 - 16 UNC - (HTP3716) Helicoil $150.00
HTP3724 3/8 - 24 UNF - (HTP3724) Helicoil $160.00
HTP4314 7/16 - 14 UNC - (HTP4314) Helicoil $200.00
HTP4320 7/16 - 20 UNF - (HTP4320) Helicoil $160.00
HTP5013 1/2 - 13 UNC - (HTP5013) Helicoil $150.00
HTP5020 1/2 - 20 UNF - (HTP5020) Helicoil $150.00
HTP5612 9/16 - 12 UNC - (HTP5612) Helicoil $200.00
HTP7510 3/4 - 10 UNC - (HTP7510) Helicoil $200.00
HTP8714 7/8 - 14 UNF - (HTP8714) Helicoil $400.00


Spec Sheet


  • Finely ground threads are sized to .0001" (.0025mm) under a Class 2B Go thread gage, with a -.0003" (.0075mm) tolerance
  • The diameter is concentric to the thread pitch diameter .0002" TIR (.005mm)
  • Certificate of Calibration is available to provide documentation of actual tolerance

Frequently Asked Questions:

Why use a locator to determine the location of a threaded hole?

Inspection methods must ensure that your parts meet or exceed specifications. Checking the hole location with gage pin, steel ball, a screw with a machined head, or a probe tip is inaccurate since the pitch diameter is not referenced per ANSI Spec Y14.5M-1982.

If my threaded hole is oversize will Tru-Pos function properly?

Yes! When the locator is seated, the upward force exerted against the thread flank causes the locator to position itself on the centerline of the tapped hole.

 Are Tru-Pos locators difficult to use?

NO! Tru-Pos locators are ground .0001" under your go-gage size for easy finger tight insertion, thereby improving productivity while eliminating sore fingers. The knurled surface is placed at the top of the locator which makes it easier to grip. Tru-Pos is ground to the base of the locator providing a more accurate measurement of the tapped hole, since the CMM probe will be closer to the surface.

Why aren't these locators split like other designs?

Material fatigue, excessive installation force, etc./ play a vital role in the repeatability of locating gages. Tru-Pos was designed to provide a reliable method in which repeatability is constant. Competitors who offer split designs do not offer the split design throughout their range of thread sizes.

There are 2 designs: Square shoulder and tapered. Why?

Tru-Pos was originally designed with a square shoulder to be used where the gage could be seated against a clean and square surface. In many applications such as castings or irregular surfaces etc. the gage cannot be properly seated, Tapered gages were designed for this condition. 

Are special sizes or configurations available?

Special sizes and configurations can be made to meet your unique requirements.
Simply call for a quote.

Are Certifications available?

Yes! Certificates of Compliance or Certificates of Calibration are available. Please specify at time of order.

I already own Tru-Pos locators. Is a recalibration service offered?

Yes! Upon return to the factory, they can provide a certificate of calibration to verify the gage is within specifications.  We cannot however, repair gages that are worn, nicked, damaged etc.

Are HeliCoil locators designed for use before or after HeliCoil insertion?

The HeliCoil series of locators are designed to be used before the HeliCoil insertion.