A Plug Gauge is a precision inspection tool used to quickly and accurately verify the dimensional accuracy and tolerance compliance of holes and bores. Engineered for reliability and ease of use, plug gauges are indispensable for quality control in machining, assembly, and inspection processes across industries.

Key Features:

✅ High-Grade Tool Steel or Carbide:
Manufactured from hardened alloy steel (typically 58–62 HRC) or solid carbide for exceptional wear resistance, long service life, and dimensional stability.

✅ Go/No-Go Design:
Typically supplied in pairs—Go ends verify the minimum acceptable diameter, while No-Go ends confirm the maximum limit, enabling fast pass/fail checks.

✅ Precision Ground Tolerances:
Bores are ground and lapped to exacting tolerances (often within ±0.001 mm), ensuring consistent and repeatable measurements.

✅ Clear Identification:
Laser-marked size, tolerance class, gauge type (Go/No-Go), and serial numbers provide easy identification and traceability.

✅ Handle Options:
Supplied with knurled, insulated, or color-coded handles to improve grip, operator comfort, and prevent thermal expansion from hand heat.

✅ Calibration Certificate:
Delivered with a calibration certificate traceable to national or international standards (ISO, DIN, ASME), supporting quality management systems.

Applications:

• Checking hole diameters in machined, drilled, reamed, or molded parts
• In-process and final inspection in automotive, aerospace, and precision engineering industries
• Acceptance checks on supplied components
• Reference standards in metrology labs

Benefits:

🔹 Quick Verification:
Allows fast Go/No-Go checks for high-volume production parts.

🔹 Consistent Accuracy:
Ensures parts comply with tight dimensional tolerances and fit requirements.

🔹 Reduced Rework:
Early detection of out-of-tolerance parts prevents assembly issues.

🔹 Long Service Life:
Wear-resistant materials maintain accuracy through thousands of inspections.

Typical Specifications (Example):

Marking: Laser-engraved identification

Material: Hardened tool steel or solid carbide

Size Range: 1 mm – 200 mm (custom sizes available)

Tolerance Class: ISO IT6, IT7, IT8, or custom tolerances

Roundness: ≤1 µm deviation

Surface Finish: Ra ≤0.2 µm