FREE PDF · 8 PAGES · 2026 EDITION
Thread Gauge Selection Guide & Tolerance Chart
Pick the right GO/NO-GO thread gauge every time: metric 4H–7H and 6g/6e classes with fundamental deviations, unified 2A/2B vs 3A/3B, gauges by standard (ISO, UN, BSP, NPT, ACME, DIN 513), use and calibration, plus an ordering checklist.
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What’s Inside
- Gauge types: plug vs ring, setting plugs, taper pipe gauges, sets
- Metric tolerance chart: 4H–7H, 6G, 4h–8g with fit and typical use
- Fundamental deviations: e, f, g, h values for common pitches
- Unified threads: 1A–3A / 1B–3B classes, UNC/UNF/UNEF/UNS/UNJ
- Gauges by standard: ISO 1502, ASME B1.2, ISO 228, ISO 7, NPT L1, ACME, Tr, DIN 513
- Use & calibration: correct gauging, storage, typical calibration intervals
- Ordering checklist: what to send for a fast, correct quote
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Who It’s For
Quality Engineers
Specify the correct gauge class for every drawing.
Incoming Inspection
Check threaded parts from suppliers with confidence.
Machine Shops
Match gauges to tapped holes and turned threads.
Buyers & Purchasing
Order the right gauges first time — no returns.
Prefer to read online? See the thread tolerance classes chart, go/no-go gauge guide and thread charts.