Precision Thread Plug Gauge - NPT 1/8 x 27

• Combined GO/NO-GO plug gauge
• Accurate verification of NPT 1/8 x 27 female threads
• Reference temperature: 20 °C
• Calibration in an independent lab with IAC thread scanners
• Factory calibration certificate available on request

Use the GO side to confirm dimensional conformity; the NO-GO side must not fully engage. This ensures fit and function per drawing and standard.

1. Conditioning: Stabilize workpiece and gauge at 20 °C.
2. Cleaning: Thoroughly clean internal thread and gauge.
3. GO test: Start GO side straight and screw in by hand only.
4. Evaluate GO: GO must seat within the permitted depth (per drawing/standard).
5. NO-GO test: Start NO-GO by hand; it must not fully engage. Do not force.
6. Documentation: Record result, date, operator, gauge ID and ambient temperature.

• Product type Precision thread plug gauge
• Thread NPT 1/8 x 27 (female)
• Design Combined: GO / NO-GO
• Reference temperature 20 °C
• Standards DIN, ISO, ANSI (per specimen specification)

Calibration is performed in a measurement laboratory separate from VÖLKEL using IAC thread scanners, following the defined specifications and standards (DIN, ISO, ANSI) for the respective specimen. A factory calibration certificate can be issued upon request.

Q1: What does GO and NO-GO mean?
A: GO verifies that the thread is within tolerance; NO-GO ensures the upper tolerance is not exceeded (must not fully engage).

Q2: Why 20 °C reference temperature?
A: Dimensions vary with temperature. 20 °C ensures comparable, standards-compliant results.

Q3: Can I use tools to drive the gauge?
A: No. Always insert by hand to avoid damage and false results.

Q4: Both GO and NO-GO engage fully—what now?
A: The thread is oversize/out of tolerance. Quarantine the part and rework or recheck.

Q5: How often should I calibrate?
A: Typically annually or condition-based when deviations occur.

Q6: NPT vs. NPTF—what’s the difference?
A: NPT typically needs sealant; NPTF is a dryseal design and may seal without additional sealant. Follow drawing/standard.