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Technical Information
  1. General Data
  2. Specifications
  3. UN UNS UNC UNF UNEF Series Gages
  4. Cylindrical Plain Gages
  5. Metric Series Gages
  6. National Pipe Thread Gages
  7. Variable Style Gages
  8. Threaded Hole Centerline Location Gages
  9. British Standard Gages
  10. Medical Luer Fittings Gages
  11. Step Pin Gage Design Page
  12. Articles about threads mostly written by others
  13. Pg Steel Conduit Thread per DIN 40430
  14. Thread Data Charts
  15. ACME Screw Threads
  16. API American Petroleum Institute

    General Data

    1. American Gage Design (AGD) Standardized Components
    2. Dynamics of Gaging
    3. Certification of Conformance vs. Long Form Certification
    4. Gage Care Maintenance and Storage
    5. GO does not GO and NOGO does GO
    6. Minor and Major Diameter Questions
    7. Pitch Diameter
    8. Questions with no specific category
    9. Ring Gage Adjusting
    10. Ring Gage Calibration by Direct Measurement
    11. Sealing Wax
    12. Set Plug Tolerances
    13. Set Plug Usage
    14. Terminology Related to Nuts and Bolts
    15. Thread Gaging Reference Guide
    16. User's Manuals for Variable Thread Measurement Systems
    17. Why Gages Grow


    1. Authorized Resellers List
    2. AS8879 (ANSI/ASME/SAE) J-series
    3. AS71051 (ANSI/ASME/SAE) ANPT-series
    4. B1.1 (ANSI/ASME) UN-series part threads
    5. B1.2 (ANSI/ASME) UN-series thread gages
    6. B1.5 (ANSI/ASME) ACME Screw Threads
    7. B1.7M (ANSI/ASME) Screw thread nomenclature and letter symbols
    8. B1.8 (ANSI/ASME) Stub ACME Screw Threads
    9. B1.9 (ANSI/ASME) Buttress Screw Threads
    10. B1.10 (ANSI/ASME) Miniature Screw Threads
    11. B1.11 (ANSI/ASME) Microscope Objective Screw Threads
    12. B1.12 (ANSI/ASME) Interference-Fit Screw Threads
    13. B1.13M (ANSI/ASME) Metric Screw Threads
    14. B1.16M (ANSI/ASME) Metric Screw Thread Gages
    15. B1.18M (ANSI/ASME) Metric Screw Threads
    16. B1.19M (ANSI/ASME) Metric Screw Thread Gauges
    17. B1.20.1 (ANSI/ASME) American Pipe Screw Threads
    18. B1.20.3 (ANSI/ASME) Dry Seal Pipe Screw Threads
    19. B1.20.4 (ANSI/ASME) Dry Seal Pipe Screw Threads (metric version)
    20. B1.20.5 (ANSI/ASME) Dry Seal Pipe Screw Thread Gages
    21. B1.20.6M (ANSI/ASME) Dry Seal Pipe Screw Thread Gages (metric version)
    22. B1.20.7 (ANSI/ASME) Hose Connection Screw Threads
    23. B1.21M (ANSI/ASME) MJ-series Screw Threads
    24. B1.22M (ANSI/ASME) MJ-series Screw Thread Gages
    25. BS-21
    26. BS-93
    27. BS-919-3
    28. BS-2779
    29. C81.61 (ANSI/ANSLG)
    30. C81.62 (ANSI/ANSLG)
    31. C81.63 (ANSI/ANSLG)
    32. C81.64 (ANSI/ANSLG)
    33. DIN 405
    34. DIN 420
    35. DIN 513
    36. DIN-2999
    37. EN 1707
    38. EN 10226-1
    39. EN 10226-1
    40. EN 10226-2
    41. EN 10226-3
    42. EN 20241
    43. EN 20594-1
    44. ISO-7-1
    45. ISO-7-2
    46. ISO-228
    47. ISO-594/1
    48. ISO-594/2
    49. ISO-5145
    50. ISO-5356-1
    51. ISO-8185
    52. ISO-8638
    53. ISO-80369-1 Medical Small-Bore Connectors
    54. ISO-80369-3 Enteral Connectors
    55. MIL-S-7742 and How It Relates to Thread Gages
    56. MIL-S-8879 obsolete J-series
    57. SAE Numbering Paradigm
    58. Unified National Thread: ANSI vs. BS vs. ISO vs. JIS
    59. V-1 (ANSI/ASME/CGA)

    UN Series Gages

    1. 3BG Class-of-Fit
    2. Controlled Root Radius on External Screw Threads
    3. Controlled Root Radius on Internal Screw Threads
    4. N vs. UN
    5. STI Gage Before or After Inserted
    6. STI Gage Tolerances
    7. Unified National Thread: ANSI vs. BS vs. ISO vs. JIS
    8. UN vs. UNC vs. UNF vs. UNEF vs. UNS
    9. UNJ vs. UN
    10. UNR vs. UN

    Cylindrical or Plain Gages

    1. Gage Maker's Tolerance Calculator and Charts
    2. GO or NOGO or Master
    3. Nominal Size

Metric Series Gages

  1. Pitch Diameter Charts
  2. STI Gage Before or After Inserted
  3. STI Gage Tolerances

National Pipe Thread Gages

  1. Designations of American National Pipe Types
  2. Before Plate NPT Gages (National Pipe Taper)
  3. Calibrate NPT-L1 Work Plug Gage using NPT Master Ring Gage
  4. Calibrate NPT-L1 Work Ring Gage using NPT Master Plug Gage
  5. Calibrate NPTF-L1 Work Plug Gage using NPTF Master Ring Gage
  6. Gages: Pipe Plug
  7. Gages: Pipe Ring
  8. How to Use: NPT; ANPT; NPTF
  9. NPSF into NPSM (Dry Seal Combination)
  10. NPT vs. ANPT (Aeronautical National Pipe Taper)
  11. NPT vs. NGT (National Gas Taper)
  12. NPT vs. NPTF (National Pipe Taper Fuel)

Variable Style Gages

  1. MTG Catalog
  2. Snap Gages, Threaded, Knife Edge Style, Maintenance
  3. Starrett no longer sells thread comparators
  4. Starrett Technical Info
  5. Why Use Thread Snap Gages

Threaded Hole Centerline Location Gages

  1. Overview
  2. Flexible Style
  3. Solid Style
  4. Tapered Style
  5. Lead Lock Style
  6. Variable Style

British Standard Gages

  1. BS-2779
  2. BS-21
  3. BS-21 Rp into R (Dry Seal Combination)
  4. BS-21 System A vs. System B
  5. DIN-2999
  6. EN-10226
  7. ISO-7
  8. ISO-7 Rp into R (Dry Seal Combination)
  9. ISO-228
  10. ISO-228 Class A vs. Class B
  11. Rp vs. G
  12. Rs vs. G
  13. Full Form vs. Truncated or Modified
  14. ISO-7 vs. BS-21
  15. Designations of British Screw Thread Types
  16. DIN-240-1923 vs BS-84
  17. Whitworth Thread Form

Articles about threads mostly written by others

  1. Hot glue, the new sealing wax.
  2. JIS (Japanese Industrial Standard) Screw Thread Specifications
  3. Are You Beating Your Gages to Death?
  4. Screw Thread Design
  5. Cut costs on UNR threads.

ACME Screw Threads

  1. The World of ACME Screw Threads
  2. Centralizing ACME Screw Threads
  3. General Purpose ACME Screw Threads
  4. Stub ACME Screw Threads
API American Petroleum Institute
  1. API Home Page
  2. BTC Buttress Casing per API Spec 5B
  3. CSG Round Casing per API Spec 5B
  4. LP Line Pipe per API Spec 5B
  5. NC Numbered Connections per API Spec 7-2
  6. NU Non-Upset Tubing per API Spec 5B
  7. TBG (EU/EUE/EUT) External Upset Tubing per API Spec 5

Original Posting: 1999
Last Revision: 1/24/2014
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

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