Precision Thread Plug Gauge (Tol. 2B) - UNF 1/2 x 20 | VÖLKEL
Precision Thread Plug Gauge (Tol. 2B) - UNF 1/2 x 20
Use this gauge when you need quick, repeatable thread inspection on the shop floor, with minimal interpretation.
Use a clean, lightly oiled gauge and a consistent feel, because contamination can create false rejects. UNC, UNF, and related UN designations describe Unified inch thread series used on equipment built to inch based fastener standards.
- Inspect threads by limit gauging, with a clear go and no go decision.
- Use in production checks, incoming inspection, and maintenance verification.
- Suitable when you need fast pass fail confirmation without measurement equipment.
- Process: manual driving or assisted driving depending on your holder and machine setup
- Use: thread cutting, re tapping, and thread cleaning depending on condition
- Use stable workholding, because movement during the start often causes oversize threads.
Note Keep the gauge clean and lightly protected, because dirt and dents can change the feel.
- Fast pass fail assessment without measurement interpretation
- Suitable for routine checks close to the production process
- Supports consistent inspection when many operators are involved
- Helps detect tool wear and process drift through repeated checks
Drawbacks
- Limited by work material hardness and by the stability of your clamping setup
- Requires careful handling to avoid edge damage in busy shop environments
- Clean the thread and remove burrs, chips, and heavy lubricant.
- Identify the go and no go sides on the gauge body.
- Apply a light protective film and align the gauge to the thread axis.
- Turn the go side with a consistent, low effort feel until it seats or reaches the specified engagement length.
- Apply the no go side with the same straight alignment and stop at the first resistance without forcing.
- Record the result according to your inspection plan and protect the gauge after use.
- 1 piece Precision Thread Plug Gauge (Tol. 2B) - UNF 1/2 x 20
- Product type: Thread Plug Gauge
- Inspection principle: Limit gauging with go and no go acceptance
- Thread designation: UNF
- How do you select the correct thread designation for this product
- Match the thread designation in the product name to the mating fastener or component standard, then confirm that your workpiece material and process setup suit the tool type. If you work with mixed standards, separate your tooling by thread family to avoid mix ups.
- How do you use the gauge without forcing
- Align the gauge to the thread axis and turn with a consistent, low effort feel. The go side should pass under normal hand force. The no go side is intended to stop early, so stop at first resistance and do not force it.
- What does a go no go result tell you
- It tells you whether the thread is within the acceptable tolerance limits for assembly. It does not provide a measured size. Use it to screen parts quickly and to monitor process drift through repeated checks.
- How do you reduce the risk of misalignment
- Start the tool with the axis visually aligned, then guide it through the first turns with low torque. Use stable workholding and avoid side load. If a thread feels tight early, remove the tool, clean chips, and inspect the entry.
- How do you handle gauge wear
- Avoid dropping the gauge and keep it free of dirt. Use light protection against corrosion and store it in a protective case. If results become inconsistent, replace the gauge or recalibrate according to your quality system.
- Where can you find the full VÖLKEL catalog section for this product family
- VG 23 catalog as PDF
Do you need help selecting or using the product?
Use the contact form.
