INSIZE Thread Plug Gauge GO/NO-GO M2.5x0.45 6H (MPN 4130-2D5)

INSIZE Thread Plug Gauge GO/NO-GO M2.5x0.45 6H is a precision gauging tool designed to inspect internal metric threads with nominal size M2.5 and pitch 0.45 mm. The gauge set contains two ends: the GO end, which verifies that a thread meets the minimum acceptance limits, and the NO-GO end, which checks that the thread does not exceed the maximum material condition. Manufactured for routine quality control, the gauge provides a direct, tactile method to confirm thread form and dimensional compliance in production and maintenance environments.

Advantages

The INSIZE GO/NO-GO thread plug gauge offers rapid pass/fail assessment without the need for power or complex instrumentation, enabling immediate decisions on threaded part conformity. Its hard-wearing material and precision-ground thread profiles deliver repeatable measurements and long service life under normal inspection conditions. The simple two-ended design reduces operator training time and supports consistent quality control workflows across machining, assembly, and repair operations.

Suitable for

• Incoming inspection of small internal metric threaded components (M2.5 x 0.45)
• In-process quality checks on production lines for fasteners and threaded parts
• Maintenance and repair tasks where quick verification of internal threads is required
• Toolrooms and small-batch manufacturing where manual gauging is preferred

When it may not be suitable

This plug gauge is specific to internal metric threads of nominal size M2.5 with 0.45 mm pitch and 6H tolerance; it is not suitable for external thread measurement or for other thread sizes and pitches. For applications that require quantitative measurements, surface finish assessment, or digital data logging, dedicated measuring instruments such as thread micrometers, optical comparators, or CMMs should be used instead.

Key specifications

• Thread size and pitch: M2.5 x 0.45
• Tolerance class: 6H (internal thread tolerance)
• Type: GO/NO-GO two-ended thread plug gauge
• Function: GO end verifies acceptance limit; NO-GO end checks maximum material condition
• Intended use: Inspection of internal metric threads

How to use

Clean the threaded hole and the gauge before inspection to remove chips, debris, and lubrication that could affect fit. Insert the GO end into the thread and apply gentle rotation; the GO end should enter and turn freely to indicate the thread meets the minimum internal dimensions. Then try the NO-GO end; it should not fully engage if the thread is within the maximum material limit. Record pass/fail results according to your quality procedures and store the gauge in a protective case to avoid damage.

What to consider before purchase

• Verify that the nominal thread size (M2.5 x 0.45) and tolerance class (6H) match the threads you need to inspect
• Decide if a simple GO/NO-GO check is sufficient or if you need quantitative measurement capability
• Consider environmental factors and handling procedures to preserve gauge accuracy (cleaning, storage, and temperature stability)

Usage recommendations

Use the gauge at ambient temperature and follow a regular calibration and inspection schedule to ensure continued accuracy. Handle the tool carefully, avoid dropping, and keep it free of contaminants. Combine GO/NO-GO checking with occasional reference measurements using calibrated instruments if traceable dimensional data is required.