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Tru-Pos Frequently Asked Questions


Why use Tru-Pos™ to determine the location of a threaded hole?

Inspection methods must ensure that your parts meet or exceed specifications. Checking the hole location with a 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.

The ASME Y14.5 Standard, Section 2.9 Screw Threads states, “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. Where an exception to this practice is necessary, the specific feature of the screw thread (such as “Major Dia." or “Minor Dia.”) shall be stated beneath the feature control frame, or beneath or adjacent to the datum feature symbol, as applicable.” In other words, the standard, the geometric tolerances and/or datum references apply to the pitch cylinder diameter unless otherwise specified.

Tru-Pos™ locators are ideally suited for locating the true position of threaded holes.

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 center-line 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 your 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 only offer a limited range of thread sizes.

You offer to 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 Tru-Pos™ locators were designed for this condition.

Are special sizes or configurations available?

Special sizes and configurations can be made to meet your unique requirements. No minimum quantity is required.
Simply c
omplete a design request form or simply call for a quote.


Are Certifications available?

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


 We already own Tru-Pos™ locators. Is recalibration available?

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


We already use locators from a competitor. Why use Tru-Pos?

It's simple:

  ♦ Over 300 sizes IN STOCK
  ♦ Over 12 configurations (English, Metric, Heli-Coli® Etc.)
  ♦ Quantity Discounts available - combine sizes!
  ♦ Custom configurations: any quantity - NO minimum.


What about UNJ locators?

Tru-Pos™ locators designed for UN series threads are automatically designed to match the pitch of your UNJ series internal thread. This is a result of the fact that equivalent UN series and UNJ series threads have the same specified minimum pitch diameter.


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.


What happened to the original manufacturer of Tru-Pos™ locators?

MW Industries acquired LaVezzi Precision, Inc. for its medical manufacturing capabilities. The company now directs its focus on the manufacture of critical medical machined components.  


Can I get a current price list of your entire product line?

Our Price List can be downloaded here.  


Have a comment or a suggestion? We would love your feedback.

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