External Diameter & Thread Inspection

Ring Gauges

Precision gauges to check the external diameter of shafts, bolts, and threaded components on the GO / NO-GO principle — verifying whether a component meets specified tolerance limits for reliable quality control.

Overview

About Ring Gauges

Ring Gauges are precision inspection gauges used to check the external diameter of shafts, bolts, and threaded components. They operate on the GO / NO-GO principle to verify whether a component meets specified tolerance limits. Ring gauges are widely used in automotive, aerospace, engineering, and manufacturing industries for accurate dimensional inspection and quality control.

At Size Gauge, we manufacture high-precision Plain Ring Gauges, Thread Ring Gauges, and GO NO GO Ring Gauges using high-grade hardened tool steel and advanced grinding processes to ensure durability, accuracy, and long service life.

Technical Specifications

Material
High Grade Tool Steel / Carbide
Hardness
58 – 62 HRC
Standards
ISO / DIN / ANSI / IS
Surface Finish
Precision Ground
Marking
Laser Marked — Size, Pitch & Tolerance
Calibration
Certificate available on request
Range
1 mm to 500 mm (standard)
Need a Custom Ring?

We manufacture special gauges as per your drawings and specifications.

Contact Our Team
Product Range

Types of Ring Gauges We Manufacture

Thread Ring Gauge

Used to check external threads on bolts, screws, and threaded components.

Range
1 mm to 200 mm
Types
Metric (ISO), UNC, UNF, UNEF, BSP, BSPT, NPT, NPTF, BSW, BSF, BA, ACME, Trapezoidal, PG
Tolerance
4g, 5g, 6g, 7g, 6h, 7h — as per ISO / ANSI / DIN standards
Thread Ring Gauge specification visual

Thread Ring Gauge

Plain Ring Gauge

Used to check the external diameter of cylindrical components to ensure they meet specified tolerance limits.

Range
3 mm to 500 mm
Material
Hardened Tool Steel / Carbide
Tolerance
h6, h7, h8, h9, h10, h11, h12 — as per ISO / DIN standards
Plain Ring Gauge specification visual

Plain Ring Gauge

Wear Check Ring Gauge

high-precision gauges used as reference standards for calibration and setting of measuring instruments.

Range
3 mm to 200 mm
Types
Metric, UNC, UNF, BSP, NPT, ACME, Trapezoidal
Tolerance
As per calibration standards / ISO / NABL requirements
Wear Check Ring Gauge specification visual

Wear Check Ring Gauge

Carbide Plain Ring Gauge

Manufactured with tungsten carbide inserts to provide excellent wear resistance and long service life in high-volume production environments.

Range
3 mm to 100 mm
Material
Tungsten Carbide Insert
Types
As per Requirement
Tolerance
4g, 5g, 6g, 7g or as per customer specification
Carbide Plain Ring Gauge specification visual

Carbide Plain Ring Gauge

Air Ring Gauge

Used to check external diameters of shafts and cylindrical components using air gauging systems.

Range
3 mm to 200 mm
Types
As per Requirement
Tolerance
h6, h7, h8, h9 — as per ISO standards
Air Ring Gauge specification visual

Air Ring Gauge

Special Ring Gauge

Custom-manufactured according to specific customer drawings or special inspection application.

Range
As per drawing
Types
Any international thread standard available
Tolerance
As required by customer specification
Special Ring Gauge specification visual

Special Ring Gauge

Industries

Industries We Serve

  • Automotive Manufacturing
  • Aerospace Industry
  • Precision Engineering
  • Machine Tool Industry
  • Fastener Manufacturing
  • Oil & Gas Industry
  • General Engineering
  • Defence Industry
Why Us

Why Choose Size Gauge

  • High precision and dimensional accuracy on every gauge
  • Manufactured using advanced grinding technology
  • Long service life and excellent wear resistance
  • Custom gauges manufactured as per drawings
  • Strict quality inspection before dispatch
  • Competitive pricing with reliable delivery

Size Gauge is a trusted Ring Gauge Manufacturer in India, specialising in precision Plain Ring Gauges, Thread Ring Gauges, and GO NO GO Ring Gauges for industrial inspection. We provide gauges in a wide range of sizes, thread standards, and tolerance grades as per ISO, DIN, ANSI, and customer specifications.