American Standard High Precision Thread Ring Gauge

Ensure flawless thread accuracy with this American Standard High Precision Thread Ring Gauge. Designed for professional machinists, quality control engineers, and manufacturers who demand exacting tolerances, this gauge set provides reliable, repeatable verification of external thread dimensions across a wide range of common thread sizes.

Available Thread Size Options

Select the exact thread size you need from the following options:

4-3/4 – 4
4-3/4 – 6
4-3/4 – 8
4-3/4 – 12
4-3/4 – 16
4-7/8 – 4
4-7/8 – 6
4-7/8 – 8
4-7/8 – 16
5 – 4
5 – 6
5 – 8
5 – 12
5 – 16
5-1/8 – 6
5-1/8 – 8

Key Features

High Precision Calibration: Manufactured to tight tolerances for accurate GO/NO-GO thread inspection.
American Standard Thread Profile: Fully compliant with ANSI/ASME thread standards for consistent results.
Wide Size Range: Covers 16 popular thread sizes from 4-3/4" to 5-1/8" in various thread pitches.
Durable Construction: Made from high-quality hardened steel for long-lasting performance in demanding workshop environments.
Professional Grade: Ideal for QC labs, manufacturing floors, and precision engineering applications.

Specifications

Standard: American Standard (ANSI/ASME)
Type: Thread Ring Gauge (GO / NO-GO)
Material: Hardened alloy steel
Electronic: No
Country of Origin: Made in China

Why Thread Ring Gauges Matter

Thread ring gauges are the industry-standard tool for verifying external (male) threads on bolts, studs, and machined parts. Using a calibrated ring gauge ensures your threaded components meet dimensional specifications before assembly — reducing rejection rates and costly rework. Learn more about measurement standards and metrology at the National Institute of Standards and Technology (NIST).

Frequently Asked Questions

Q: What is a thread ring gauge used for?

A: A thread ring gauge is a precision measurement tool used to verify the dimensional accuracy of external (male) threads on machined parts such as bolts, screws, and shafts. It comes in GO and NO-GO versions — the GO gauge should pass over the thread, while the NO-GO gauge should not — confirming the thread is within acceptable tolerance limits.

Q: Which thread standard do these gauges conform to?

A: These gauges conform to the American Standard thread specification (ANSI/ASME), making them suitable for use in industries across North America and wherever American Standard threads are specified in engineering drawings.

Q: How do I choose the right thread size option?

A: Select the option that matches the nominal diameter and threads-per-inch (TPI) of the external thread you need to inspect. For example, "5 – 8" means a 5-inch nominal diameter with 8 threads per inch. Refer to your engineering drawing or part specification for the correct designation.

Q: Is this gauge suitable for workshop and QC lab use?

A: Yes. This high precision thread ring gauge is designed for professional use in quality control laboratories, manufacturing facilities, and precision machining workshops where repeatable and accurate thread inspection is essential.