VÖLKEL Precision Thread Plug Gauges
Reliable GO/NO-GO inspection of internal threads according to DIN, ISO, UNC and UNF.
Why VÖLKEL Thread Plug Gauges?
From production and quality assurance to maintenance and service – achieve fast and reliable pass/fail decisions for internal threads.
Precision GO/NO-GO Testing
Clearly verify if internal threads are within tolerance using GO and NO-GO sides in one instrument.
Standards-Compliant
Inspection according to DIN, ISO, UNC, UNF – ideal for OEMs, suppliers and workshops.
Consistent Measurement Results
Clean gauges, defined test conditions and structured procedure ensure reproducible results.
Factory Calibration
Calibration on IAC thread scanners with traceable results and certificates.
Robust & Durable
Manufactured as high-accuracy measuring instruments for daily use.
For Industry & Workshops
Suitable for QA, assembly, maintenance and service environments.
How to Use a VÖLKEL Thread Plug Gauge
Simple, structured GO/NO-GO inspection of internal threads – from preparation to final assessment.
- 1. Preparation: Clean gauge + thread. Remove chips/burrs. Ensure 20°C temperature.
- 2. GO Inspection: Light fingertip pressure. Must screw in completely.
- 3. NO-GO Inspection: Must NOT screw in more than 1–2 turns.
- 4. Final Assessment: Thread is conforming if GO passes & NO-GO does not.
- 5. Care: Clean after use, apply light oil, store in protective box.
Your Benefits in Quality Assurance
Combine practical handling with metrological reliability.
Reliable Acceptance Criteria
Fast GO/NO-GO pass/fail decisions.
High Measuring Accuracy
Precisely machined thread profiles.
Traceable Calibration
Factory-calibrated on IAC thread scanners.
Reduced Scrap Risk
Detect out-of-tolerance threads early.
Long Gauge Life
Proper handling and care prolong service life.
Suitable for Mixed Use
Industry, workshops, service teams.
Typical Applications
Wherever threads must function reliably.
Production & QA
In-process inspection, SPC checks, final inspection.
Incoming Goods
Verify components meet required tolerances.
Maintenance & Repair
Check thread condition before reassembly.
Safety-Critical Components
Mechanical engineering, automotive, machinery.
Downloads & Documentation
Prefer compact information? Request application guidance or calibration details.
Application Guide
Instructions and support on using VÖLKEL thread plug gauges in production, QA and service.
Calibration Information
Learn about factory calibration on IAC thread scanners.
Frequently Asked Questions
Practical answers for everyday use in production, QA and maintenance.
Always use light fingertip pressure only. Never force the gauge.
GO must screw in fully. NO-GO must not exceed 1–2 turns.
Thread gauges and workpieces are calibrated for 20°C. Deviations affect accuracy.
Typically annually, depending on usage intensity and quality requirements.
Stop use, clean both parts, repeat test, recalibrate if necessary.