Roller Calliper Gauge

S.G. Prittie manufactures a large range of thread roller calliper gauges to Australian and International Standards. We manufacture standard or special thread forms to order. All our gauges are made from hardened tool steel to ensure long life. They are supplied with a manufacturers certificate of conformance (COC) and a storage case.

Product options

NATA Calibration – ISO 17025
Modified tolerances, example plating allowance

Applicable standards

I.S.O.   A.S.
B.S.   A.N.S.I.

Why this product is used

Thread roller calliper are an efficient way to check external thread conformance. Simply apply the Go rollers, they should go over the thread. Then apply the Nogo rollers, they should not go over the thread. This condition indicates a conforming part. Thread roller callipers are especially suited for long threads because they can be quickly applied to any section of the part.

  • Customisation

    Customisation is offered on most gauges. We can add a new feature to a standard gauge, manufacture a revised design based on a standard gauge, or design a new gauge to suit your application.

  • Support

    We offer design and technical support for all our gauges, as well as support for measurement and calibration inquiries. Contact us via phone or email.

  • Delivery

    We offer express or economy delivery and can send products to local, interstate and overseas locations. We’re also happy to use your own delivery supplier.

  • Manufacturing

    We are an Australian business located in Airport West Victoria. Quality is a priority and we have ISO 9001 and ISO 17025 management systems in place.


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Thread type Range in stock Range manufactured
ISO Metric Coarse M2 – M36 M2 – M260
ISO Metric Fine M2 – M36 M2 – M260
UNC No.1 - 12 and 1/4” - 1 1/4” No.1 - 12 and 1/4” - 10”
UNF No.1 - 12 and 1/4” - 1 1/4” No.1 - 12 and 1/4” - 10”
BSW Made to order 1/8” - 10”
G Series (formally BSPF) Made to order 1/8” - 6”
Acme Made to order 1/8” - 10”
Trapezodial Made to order M6 – M260


What are the pros and cons of a thread roller calliper gauge?


Very quick way to gauge thread conformance.

Ability to gauge very long threads quickly, no need to screw on a ring gauge.

Can gauge RH and LH threads with the same gauge.


Thread is only checked at two points, roundness is not checked.

Needs to be applied with light force, high force applied may accept oversize parts.

How often do I need to calibrate my gauge?

There is no fixed time, calibration frequency is based on how often the gauge is used and the conditions that the gauge is exposed to. Frequent use and abrasive materials will require more frequent calibration, low use in a clean environment will allow less frequent calibration. Usually the user determines the calibration frequency.

Can a gauge be made to my own specification?

Yes, we can design special thread forms and create gauges for your manufacturing process.

If you need assistance selecting the correct gauge or have technical questions please contact us.

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