Plug Gauges / Screw Gauges

Precision Inspection Tools for Thread & Hole Measurement

Plug gauges and screw gauges are precision measuring instruments used to inspect internal diameters, hole tolerances, and thread accuracy in machined components. They ensure parts conform to dimensional standards and play a critical role in quality control, machining inspection, and mass production environments.

Types of Plug Gauges / Screw Gauges

• Thread Plug Gauge: Used to check internal threads for pitch, diameter, and tolerance using GO/NO-GO inspection.
• Thread Ring Gauge: Verifies external thread accuracy on bolts and shafts.
• Limit Plug Gauge: Confirms hole size is within specified upper and lower limits.
• Thread Pin Gauge: Measures small threaded holes and fine pitch threads with high accuracy.
• Standard Thread Gauge: Used for quick identification and verification of thread profiles.

Key Specifications & Selection Criteria

• Nominal Size & Pitch (P): Must match the thread standard being inspected
• Workpiece Type: Steel, aluminum, or special alloys
• Accuracy Class: Determines inspection precision for production or reference use
• GO / NO-GO Design: Ensures reliable pass/fail judgement during inspection

Applications Across Industries

Plug gauges and screw gauges are widely used in automotive manufacturing, tool rooms, CNC workshops, and inspection labs where dimensional accuracy and repeatability are critical.

Reliable Quality from Trusted Brands

Leading brands such as DAIICHISOKUHAN, EISEN, and MORIMOTO_SHAFT offer high-precision gauges with excellent wear resistance and long service life, supporting consistent inspection performance in demanding production environments.

Designed for accuracy, durability, and ease of use, Plug Gauges / Screw Gauges are indispensable tools for maintaining machining quality and production standards.