Precision Thread Plug Gauge (Tol. 4H) - M 3 x 0.5

A thread plug gauge is essential for anyone who requires precision in their manufacturing. This gauge stands out due to:

• Easy to Use: With just one tool, you check both the minimum and maximum dimensions of a thread. The go end checks that the thread is not too small, and the no-go end checks that it's not too large.
• High Precision: The 4H tolerance class stands for a very tight fit. It's typically used for high-quality, precise connections where even the smallest deviations matter.
• Clear Identification: The red ring on the no-go end ensures a quick and safe distinction.
• Quality Assurance: Checking against strict tolerances ensures your manufactured parts meet quality requirements.

A thread plug gauge is easy to use if you follow these steps:

1. Step 1: Check the go end. The go end of the thread plug gauge must screw into the thread cut into a part by hand (without using excessive force).
   • If it doesn't screw in: The thread is too small. It does not meet the requested standards (=scrap).
2. Step 2: Check the no-go end. The scrap side of the thread plug gauge must not be able to be manually turned more than two turns into the cut thread (without using excessive force).
   • If it can be screwed in further: The thread is too large. It does not meet the requested standards (=scrap).

Important Note: The reference temperature for parts and gauges is 20° Celsius for a correct measurement.

• Thread Type: Metric ISO Thread
• Tolerance: 4H
• Nominal Size: M 3 x 0.5
• EAN: 4022835174264
• Item Number: 17426

Q: What is a thread plug gauge and why do I need one?

A: A thread plug gauge is a precision measuring tool for the quick inspection of internal threads. It has a go and a no-go side, ensuring the thread is neither too tight nor too loose, and guaranteeing compliance with tolerances.

Q: What does the 4H tolerance mean?

A: The 4H tolerance is a very tight thread fit. It is used for high-precision applications where minimal play between the threaded parts is required.

Q: Why is the 20°C reference temperature so important?

A: Metals expand when heated and contract when cooled. A standardized reference temperature of 20°C ensures that measurement values are consistent and comparable, regardless of the ambient temperature during the inspection.

Q: What does the red ring on the gauge signify?

A: The red ring marks the no-go end of the gauge. If this end fits into the thread more than two turns, the part is defective and must be scrapped.

Q: Can I get a calibration certificate for this gauge?

A: Yes. VÖLKEL will issue a factory calibration certificate upon request. The calibration is performed according to specified standards in our independent measurement laboratory using IAC thread scanners.