A Plain Cylindrical Plug Gauge is a precision Hole Inspection Gauge used for accurate checking of internal holes and bores. It is designed for quick and repeatable dimensional inspection in production and quality-control operations.

Purpose: Used to check internal diameter, bore size, and dimensional conformity of plain holes.

Efficiency: Provides quick GO/NO-GO inspection, reducing inspection time and operator-dependent measurement variation.

Strength: Typically manufactured from hardened tool steel with 58–62 HRC hardness, precision-ground gauging surfaces, and wear-resistant construction.

A Thread Plug Gauge is a precision Thread Inspection Gauge used to verify internal threads for size, pitch, profile, and functional fit. It provides a reliable method for checking tapped holes against specified thread requirements.

Purpose: Used to inspect internal threads for correct size, pitch, and functional engagement.

Efficiency: Provides fast functional thread inspection without requiring separate measurement of every thread characteristic.

Strength: Typically manufactured from hardened tool steel with 58–62 HRC hardness and precision-finished thread surfaces for improved wear resistance.

A Progressive Plug Gauge incorporates multiple gauging sections in a progressive arrangement to check dimensional conditions sequentially. It is designed to improve inspection speed during repetitive production operations.

Purpose: Used for progressive checking of specified internal dimensions and tolerance conditions.

Efficiency: Combines multiple checking functions into one gauge, reducing gauge handling and inspection time.

Strength: Typically manufactured from hardened gauge steel with 58–62 HRC hardness, precision-ground sections, and wear-resistant gauging surfaces.

A Taper Plug Gauge is a precision inspection gauge used to check internal tapered holes, sockets, and fittings. It verifies taper conformity and proper seating according to the specified dimensional requirements.

Purpose: Used to check internal taper, taper angle, size, and seating condition.

Efficiency: Provides direct and rapid verification of taper conformity without complex measurement procedures.

Strength: Typically manufactured from hardened tool steel with 58–62 HRC hardness and precision-ground taper surfaces for dimensional stability.

A Pin Gauge is a precision cylindrical gauge used for checking small holes, slots, and close-tolerance internal dimensions. It is commonly supplied individually or as Pin Gauge Sets for accurate dimensional comparison.

Purpose: Used to verify small internal diameters and close-tolerance dimensions.

Efficiency: Allows quick dimensional comparison using a precisely controlled reference diameter.

Strength: Typically manufactured from hardened gauge steel with 58–62 HRC hardness, precision-ground surfaces, and controlled dimensional accuracy.

A Spline Plug Gauge is a specialized precision gauge used to inspect internal spline profiles and grooved bores. It verifies the dimensional and functional condition of spline features.

Purpose: Used to inspect internal spline profile, tooth dimensions, and functional fit.

Efficiency: Enables functional inspection of the complete spline profile in a single gauging operation.

Strength: Typically manufactured from hardened tool steel with 58–62 HRC hardness and precision-machined spline surfaces for repeated engagement.

A GO Plug Gauge is manufactured to the specified GO limit and is designed to enter the acceptable bore under prescribed inspection conditions. It provides a fast functional check of the hole's dimensional condition.

Purpose: Used to confirm that the hole is not undersize beyond the specified GO limit.

Efficiency: Provides rapid functional inspection without direct numerical measurement.

Strength: Typically manufactured from hardened gauge steel with 58–62 HRC hardness and precision-ground gauging surfaces for repeated use.

A NO-GO Plug Gauge is manufactured to the specified NO-GO limit and is designed not to enter the bore beyond the permitted amount. It is generally used together with a GO gauge for complete limit inspection.

Purpose: Used to confirm that the hole has not exceeded the specified dimensional limit.

Efficiency: Provides a quick acceptance check without requiring detailed dimensional measurement.

Strength: Typically manufactured from hardened gauge steel with 58–62 HRC hardness and precision-ground surfaces for improved wear resistance.

A Double-Ended or Combination Plug Gauge combines the GO and NO-GO members on opposite ends of one handle. This configuration provides a convenient solution for repetitive Go / No-Go Gauge inspection.

Purpose: Used to perform both GO and NO-GO inspection with a single gauge.

Efficiency: Reduces tool changing, handling time, and operator movement during repetitive inspection.

Strength: Typically manufactured with 58–62 HRC hardened gauging members, precision-ground surfaces, and a robust handle configuration for repeated use.