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Pipe Thread Identifiers

Pipe Thread Detectives® are precise and easy to use thread identifiers for both male and female fittings. They are especially well-suited for distinguishing between similar National, British and ISO pipe threads.

CNC machined identifiers glide on wire lanyards. Permanent, easy to read size markings are laser etched into each stand-off. Shatterproof, color-coded gauge dividers allow recognition of each strand at a glance. NPT strands are color coated with black dividers. Thread Identifiers are equipped with a 3-3/8”(85mm) ruler. The ruler can be printed with your company or customer’s information for promotional use. For your convenience we provide extra-long wire rope for those hard to reach places, as well as loops for convenient hanging.

-NPT National Pipe Tapered Sizes: 1/8-27, 1/4-18, 3/8-18, 1/2-14, 3/4-14

-NPS National Pipe Straight Sizes: 1/8-27, 1/4-18, 3/8-18, 1/2-14, 3/4-14

-BSPP British Standard Parallel Pipe Sizes: 1/8-28, 1/4-19, 3/8-19, 1/2-14, 3/4-14

-BSPT British Standard Tapered Pipe Sizes: 1/8-28, 1/4-19, 3/8-19, 1/2-14, 3/4-14

-ISO International Standards Organization: M5, M8, M10, M12, M14, M16, M18, M22, M27

Coming Soon: Addition of 1" to both straight sizes listed above (Qtr 2 2019)


*For use in identifying plumbing pipe thread sizes only, including NPT/NPS/BSPT/BSPP/ISO. ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED. Do not force National style Pipe Thread Detective (NPS/NPT) on British style threads (BSPP/BSPT) or vice versa, as doing so will not properly identify and may damage threads. Do not use damaged threads for any applications, as doing so may result in personal injury, death or damage to property. Not for use in high pressure applications or applications involving hazardous materials, liquids, or gasses. Reading the instructions is highly recommended. For instructional information please visit

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NPT Pipe Thread Identifier

NPT Pipe Thread Identifier

BSPP Pipe Thread Identifier

NPT Pipe Thread Detective®/Thread Identifier

NPS Thread Detective®/Thread Identifier

BSPP Thread Detective®/Thread Identifier

BSPT Pipe Thread Identifier

ISO Pipe Thread Checker

All-In-One Pipe Thread Checker

BSPT Thread Detective®/Thread Identifier

ISO Thread Detective®/Thread Identifier

All-In-One Pipe Thread Detective®/Thread Identifier

Instructions Logo

Pipe Thread Instructions *Recommended Read*

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