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ISO 1502 Metric Thread gage VS ASME B1.16M Metric Thread Gage
Source: | Author:BPV thread Gauges,China HBPV thread gages supplier | Published time: 141 days ago | 181 Views | Share:
ISO 1502 Metric Thread gage,ASME B1.16M Metric Thread Gage,Do you know the difference between them?

ISO 1502 Metric Thread gage,ASME B1.16M Metric Thread Gage,Do you know the difference between them? 


A Comparative Guide: ISO 1502 vs. ASME B1.16M Metric Thread Gages

In the globalized manufacturing industry, metric screw threads are ubiquitous. Ensuring their accuracy and interchangeability requires precise standards for thread gauging. Two of the most prominent standards for metric thread gauges are ISO 1502 and ASME B1.16M. While they share a common goal—to verify the acceptability of metric threads—they originate from different standardization bodies and have key distinctions. This article explores their similarities and differences and provides a comprehensive list of gauge specifications compatible with both standards.

Overview of the Standards

  • ISO 1502: "ISO general-purpose metric screw threads — Gauges and gauging" is an international standard developed by the International Organization for Standardization. It is the predominant standard used in Europe, Asia, and most other regions outside of North America. It provides a comprehensive system for the design, dimensions, and use of "GO" and "NOGO" gauges for ISO metric threads.

  • ASME B1.16M: "Gages and Gaging for Metric M Screw Threads" is an American national standard, published by the American Society of Mechanical Engineers. It is primarily used in the United States and Canada. This standard specifies the requirements for thread gauges used to inspect metric "M" profile screw threads, aligning closely with the ISO metric thread profile but with specific gaging nuances.

Key Similarities

  1. Thread Profile Basis: Both standards are built upon the same fundamental ISO 68-1 metric screw thread profile. The basic thread form (60-degree flank angle, truncation of crests and roots) is identical.

  2. Gauge Types: Both standards define the use of GO and NOGO thread ring gauges and thread plug gauges for inspecting external and internal threads, respectively.

  3. Functional Purpose: The core purpose of gauges from both standards is the same: a GO gauge must assemble onto a good thread, and a NOGO gauge must not, thereby checking the thread's virtual size and ensuring it lies within the specified tolerance zone.

  4. Tolerance Systems: Both standards reference the same fundamental ISO tolerance system for pitches and diameters (e.g., tolerance positions g for external threads and H for internal threads, with grades like 6g/6H being common).

  5. Gauge Accuracy: Both standards define multiple accuracy classes for the gauges themselves (e.g., "Reference," "Inspection," "Working" grades in ASME; tolerance on the gauge thread in ISO) to ensure the gauges are more precise than the threads they are inspecting.

Key Differences

FeatureISO 1502ASME B1.16M
Governing BodyInternational Organization for StandardizationAmerican Society of Mechanical Engineers
Geographic PrevalenceGlobal (outside North America)Primarily United States and Canada
Standard StructureA single, comprehensive document for gauging.Often used in conjunction with other ASME standards for a complete thread specification.
Gauge Length/Number of ThreadsSpecifies a "checking length" for the NOGO gauge. The overall length of ring gauges is standardized.Specifies a minimum number of threads (e.g., 3-4 threads) for the NOGO gauge engagement. The specific length of ring gauges may differ from ISO.
Handle and IdentificationMay have variations in handle design and color-coding. Marking requirements are specified within the standard.Has specific requirements for handle configurations (e.g., a single groove on the GO handle, three grooves on the NOGO handle) and markings.
Master / Setting Plug GaugesThe system for calibrating ring gauges using master setting plugs is well-defined within the standard.Also defines the use of master setting plugs, but the specific tolerances and practices may have minor differences.

Practical Implications and Interchangeability

For many common thread sizes and tolerance classes, a gauge manufactured to ISO 1502 can be functionally equivalent to one manufactured to ASME B1.16M. The critical functional dimensions—the pitch diameter limits and the thread form—are derived from the same basic thread specification.

However, the differences become important in specific contexts:

  • Customer Specification: A contractual requirement may explicitly call for gauging per ASME B1.16M or ISO 1502.

  • Audits and Certification: In regulated industries, using the specified standard is crucial for compliance.

  • Calibration System: The master gauges used to calibrate the working ring gauges must conform to the same standard to ensure traceability.

Many high-quality gauge manufacturers, like Sowant Precision Gage (SWTG), produce gauges that are designed to meet the critical dimensional requirements of both standards. This is achieved through precise CNC machining and full-parameter thread scanning, ensuring the gauge's functional geometry is correct regardless of the standard's name.

70 Specifications of Thread Ring Gauges (Compatible with ISO 1502 / ASME B1.16M)

The following list includes a wide range of metric thread ring gauges. High-precision manufacturers like SWTG can produce these gauges to be compliant with the functional inspection requirements of either ISO 1502 or ASME B1.16M.

  1. Solid Thread Ring Gage, M90×2.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  2. Thread Master Ring Gage, M64×0.7-6h, ISO 1502 or ASME B1.16M, Brand: SWTG

  3. Solid Thread Ring Gage, M65×0.8-6g GO/NOGO, ISO 1502 or ASME B1.16M

  4. Solid Thread Ring Gage, M66×1.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  5. Solid Thread Ring Gage, M68×1.25-6g GO/NOGO, ISO 1502 or ASME B1.16M

  6. Solid Thread Ring Gage, M100×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  7. Solid Thread Ring Gage, M120×1.75-6g GO/NOGO, ISO 1502 or ASME B1.16M

  8. Solid Thread Ring Gage, M140×2.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  9. Solid Thread Ring Gage, M160×2.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  10. Solid Thread Ring Gage, M180×2.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  11. Solid Thread Ring Gage, M200×2.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  12. Solid Thread Ring Gage, M220×2.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  13. Solid Thread Ring Gage, M240×3.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  14. Solid Thread Ring Gage, M270×3.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  15. Solid Thread Ring Gage, M300×3.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  16. Solid Thread Ring Gage, M330×3.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  17. Solid Thread Ring Gage, M360×4.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  18. Solid Thread Ring Gage, M390×4.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  19. Solid Thread Ring Gage, M42×4.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  20. Solid Thread Ring Gage, M45×4.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  21. Solid Thread Ring Gage, M48×5.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  22. Solid Thread Ring Gage, M52×5.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  23. Solid Thread Ring Gage, M56×5.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  24. Solid Thread Ring Gage, M60×5.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  25. Solid Thread Ring Gage, M64×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  26. Solid Thread Ring Gage, M68×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  27. Solid Thread Ring Gage, M72×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  28. Solid Thread Ring Gage, M76×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  29. Solid Thread Ring Gage, M80×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  30. Solid Thread Ring Gage, M85×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  31. Solid Thread Ring Gage, M95×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  32. Solid Thread Ring Gage, M100×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  33. Solid Thread Ring Gage, M105×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  34. Solid Thread Ring Gage, M110×6.0-6g GO/NOGO, ISO 1502 or ASME B1.16M

  35. Solid Thread Ring Gage, M130×0.5-4h6h GO/NOGO, ISO 1502 or ASME B1.16M

  36. Solid Thread Ring Gage, M100×1.25-6g GO/NOGO, ISO 1502 or ASME B1.16M

  37. Solid Thread Ring Gage, M102×1.25-6g GO/NOGO, ISO 1502 or ASME B1.16M

  38. Solid Thread Ring Gage, M104×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  39. Solid Thread Ring Gage, M106×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  40. Solid Thread Ring Gage, M108×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  41. Solid Thread Ring Gage, M200×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  42. Solid Thread Ring Gage, M220×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  43. Solid Thread Ring Gage, M250×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  44. Solid Thread Ring Gage, M270×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  45. Solid Thread Ring Gage, M300×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  46. Solid Thread Ring Gage, M330×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  47. Solid Thread Ring Gage, M350×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  48. Solid Thread Ring Gage, M380×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  49. Solid Thread Ring Gage, M40×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  50. Solid Thread Ring Gage, M42×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  51. Solid Thread Ring Gage, M45×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  52. Solid Thread Ring Gage, M48×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  53. Solid Thread Ring Gage, M50×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  54. Solid Thread Ring Gage, M55×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  55. Solid Thread Ring Gage, M58×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  56. Solid Thread Ring Gage, M62×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  57. Solid Thread Ring Gage, M65×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  58. Solid Thread Ring Gage, M70×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  59. Solid Thread Ring Gage, M75×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  60. Solid Thread Ring Gage, M80×1.5-6g GO/NOGO, ISO 1502 or ASME B1.16M

  61. Thread Master Ring Gage, M80×1.25-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  62. Thread Master Ring Gage, M120×1.75-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  63. Thread Master Ring Gage, M200×2.5-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  64. Thread Master Ring Gage, M300×3.5-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  65. Thread Master Ring Gage, M360×4.0-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  66. Thread Master Ring Gage, M420×4.5-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  67. Thread Master Ring Gage, M480×5.0-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  68. Thread Master Ring Gage, M560×5.5-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  69. Thread Master Ring Gage, M64×6.0-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

  70. Thread Master Ring Gage, M72×6.0-4h, ISO 1502 or ASME B1.16M, Brand: SWTG

Conclusion

Choosing between ISO 1502 and ASME B1.16M for metric thread gaging often depends on regional practices, customer requirements, and quality system protocols. Fundamentally, both standards serve the same critical quality control function with a high degree of technical alignment.

For manufacturers and quality inspectors operating in a global context, partnering with a gauge supplier like Sowant Precision Gage (SWTG) that understands the nuances of both standards and utilizes advanced manufacturing and inspection technologies is crucial. This ensures that the thread ring gauges you receive, whether specified to ISO 1502 or ASME B1.16M, provide the highest level of accuracy, reliability, and traceability for your precision measurement needs.