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Set Size: 26-Piece Set — Essential

26-Piece Set — Essential
44-Piece Set — More Sizes

Description

Stop Guessing, Start Fixing

Identify nut and bolt thread sizes with a simple test fit. Choose from 26-piece and 44-piece boxed sets to make hardware sorting and replacement selection easier.

Inch & Metric Color-Coded Gauges Case Included

Choose Your Set

The 26-piece set offers a practical selection for everyday projects. The 44-piece set includes all 26 sizes plus 18 additional sizes for a wider range of fasteners.

Feature 26-Piece Set 44-Piece Set
Inch Gauges 14 23
Metric Gauges 12 21
Total Gauges 26 44
Carrying Case Included Included

Easy-to-Read, Color-Coded Sizes

Blue gauges identify inch sizes, while red gauges identify metric sizes. Size markings help you locate the gauge you need and read the matching thread specification.

Each gauge checks both nuts and bolts using its internal and external threads.

Red metric gauges and blue inch gauges

Organize Your Loose Hardware

Sort mixed nuts and bolts by thread size, label your storage bins, and make matching hardware easier to find. Return each gauge to its place in the case when the job is done.

Sorting nuts and bolts by thread size

Ready for Garage and Home Projects

Keep the set close for DIY projects, vehicle maintenance, and workshop repairs. Match an unknown fastener to one of the included sizes before selecting replacement nuts or bolts.

Thread checking for workshop and repair projects

Full Size Specifications

26-Piece Boxed Set

Package includes: 26 thread gauges and 1 carrying case.

Inch Sizes — 14 Gauges

6-32 8-32 10-24 10-32 1/4-20 1/4-28 5/16-18 5/16-24 3/8-16 3/8-24 7/16-14 7/16-20 1/2-13 1/2-20

Metric Sizes — 12 Gauges

M4 × 0.7 M5 × 0.8 M6 × 1.0 M7 × 1.0 M8 × 1.0 M8 × 1.25 M10 × 1.0 M10 × 1.25 M10 × 1.5 M12 × 1.25 M12 × 1.5 M12 × 1.75

44-Piece Boxed Set

Package includes: 44 thread gauges and 1 carrying case.

Inch Sizes — 23 Gauges

6-32 6-40 8-32 10-24 10-32 1/4-20 1/4-28 5/16-18 5/16-24 3/8-16 3/8-24 7/16-14 7/16-20 1/2-13 1/2-20 9/16-12 9/16-18 5/8-11 5/8-18 3/4-10 3/4-16 1-8 1-12

Metric Sizes — 21 Gauges

M3 × 0.5 M4 × 0.7 M5 × 0.8 M6 × 1.0 M7 × 1.0 M8 × 1.0 M8 × 1.25 M10 × 1.0 M10 × 1.25 M10 × 1.5 M12 × 1.25 M12 × 1.5 M12 × 1.75 M14 × 1.5 M14 × 2.0 M16 × 1.5 M16 × 2.0 M20 × 1.5 M20 × 2.5 M24 × 2.0 M24 × 3.0

Piece counts refer to the thread gauges. Each set also includes one carrying case.

Check Threads in Three Simple Steps

  1. Select a gauge close to the fastener's diameter.
  2. Gently thread the bolt into the gauge, or the nut onto the gauge's threaded post.
  3. Check for a smooth fit and read the size marking.

Use finger pressure only. If the threads bind, stop and try another size. Do not force the gauge onto damaged or mismatched threads.

Frequently Asked Questions

Which set should I choose?
Choose the 26-piece set if its listed sizes cover your projects. Choose the 44-piece set for all of those sizes plus 9 additional inch sizes and 9 additional metric sizes.
Do both sets include a carrying case?
Yes. Each set includes a carrying case with individual spaces to keep the gauges organized and easy to carry.
Can it check both nuts and bolts?
Yes. Use the internal threads to check bolts and the external threads to check nuts. The gauges identify matching thread sizes; they do not repair damaged threads.