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.     Thread Data Charts

14.     ACME Screw Threads

15.     API American Petroleum Institute

General Data

1.        American Gage Design (AGD) Standardized Components

2.        Dynamics of Gauging

3.        Calibration/Recalibration Frequency Intervals

4.        Certification of Conformance vs. Long Form Certification

5.        Deep Hole Thread Measurement

6.        Gage Care Maintenance and Storage

7.        GO does not GO and NOGO does GO

8.        Minor and Major Diameter Questions

9.        Pitch Diameter

10.     Questions with no specific category

11.     Ring Gage Adjusting

12.     Ring Gage Calibration by Direct Measurement

13.     Ring Gage Solid vs Adjustable Styles

14.     Sealing Wax

15.     Set Plug Tolerances

16.     Set Plug Usage

17.     Terminology Related to Nuts and Bolts

18.     Thread Gauging Reference Guide

19.     User's Manuals for Variable Thread Measurement Systems

20.     Why Gages Grow

21.     Out of Business and/or Sold Screw Thread Gage Makers

Specifications

1.        Authorized Resellers List

2.        A-A 59158 (STI) Unified Screw Thread Inserts

3.        AS8879 (ANSI/ASME/SAE) J-series

4.        AS71051 (ANSI/ASME/SAE) ANPT-series

5.        B1.1 (ANSI/ASME) UN-series part threads

6.        B1.2 (ANSI/ASME) UN-series thread gages

7.        B1.5 (ANSI/ASME) ACME Screw Threads

8.        B1.7M (ANSI/ASME) Screw thread nomenclature and letter symbols

9.        B1.8 (ANSI/ASME) Stub ACME Screw Threads

10.     B1.9 (ANSI/ASME) Buttress Screw Threads

11.     B1.10 (ANSI/ASME) Miniature Screw Threads

12.     B1.11 (ANSI/ASME) Microscope Objective Screw Threads

13.     B1.12 (ANSI/ASME) Interference-Fit Screw Threads

14.     B1.13M (ANSI/ASME) M-series Metric Screw Threads

15.     B1.16M (ANSI/ASME) M-series Metric Screw Thread Gages

16.     B1.20.1 (ANSI/ASME) American General-Purpose Pipe Screw Threads - Parts and Gages

17.     B1.20.2M (ANSI/ASME) American General-Purpose Pipe Screw Threads - Parts and Gauges (metric version)

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 R-series British Standard Pipe Tapered (BSPT)

26.     BS-93 BA-series British Association Screw Threads

27.     BS-919-3 Screw gauge limits and tolerances - Part 3: Specification for gauges for screw threads of ISO metric form

28.     BS-1580-1 Unified Screw Threads; Part 1; 1/4" and larger

29.     BS-1580-2 obsolete

30.     BS-1580-3 Unified Screw Threads; Part 3; smaller than 1/4"

31.     BS-2779 obsolete

32.     C81.61 (ANSI/ANSLG) Electric Lamp Bases

33.     C81.62 (ANSI/ANSLG) Electric Lamp Holders

34.     C81.63 (ANSI/ANSLG) Electric Lamp Bases and Lampholders

35.     C81.64 (ANSI/ANSLG) Guidelines and General Information for Electric Lamp Bases, Lampholders, and Gauges

36.     DIN 405 Rd-series Knuckle Screw Threads

37.     DIN 420 Whitworth Screw Threads (same as BS-84)

38.     DIN 513 S-Series 3°/30° Metric Buttress Screw Threads

39.     DIN-2999 withdrawn

40.     DIN-6063-1 Threads, mainly for plastic containers - Part 1: Buttress threads, dimensions

41.     DIN 40430 Pg-series Steel Conduit Thread

42.     EN 1707 Luer Connections for Needles and Syringes

43.     EN 10226-1 British Standard Pipe (R-external to Rp-internal)

44.     EN 10226-2 British Standard Pipe (R-external to Rc-internal)

45.     EN 10226-3 R-series British Standard Pipe Gages

46.     EN 10241 Steel Threaded Pipe Fittings DN6 to DN150

47.     EN 13544-2 Respiratory Therapy Tubing and Connectors

48.     EN 20594-1 Luer Connections for Needles and Syringes

49.     GB 8335 Chinese Gas Cylinder Neck and Valve

50.     HIMA MD 70.1 expired

51.     ISO-7-1 R-series British Standard Pipe Screw Threads

52.     ISO-7-2 R-series British Standard Pipe Screw Thread Gages

53.     ISO-228 G-series British Standard Pipe Screw Threads

54.     ISO-594/1 Luer Connections for Needles and Syringes - Cone

55.     ISO-594/2 Luer Connections for Needles and Syringes - Threads

56.     ISO-2853 Stainless Steel Threaded Couplings for the Food Industry

57.     ISO-5145 Cylinder Valve Outlets for Gases and Gas Mixtures

58.     ISO-5356-1 Anesthetic and Respiratory Equipment – Conical Connectors

59.     ISO-5408 Screw Thread Vocabulary

60.     ISO-8185 Humidifiers for Medical Use

61.     ISO-8638 Cardiovascular Implants and Extracorporeal Systems

62.     ISO-18250-1 Medical Reservoirs

63.     ISO-18250-3 Enteral Reservoirs

64.     ISO-80369-1 Medical Small-Bore Connectors

65.     ISO-80369-3 Enteral Connectors

66.     ISO-80369-6 Neuraxial Connectors

67.     ISO-80369-7 Connectors with 6% (Luer) taper for intravascular or hypodermic applications

68.     ISO-80369-20 Common Test Methods for ISO 80369

69.     MIL-S-7742 and How It Relates to Thread Gages

70.     MIL-S-8879 obsolete J-series

71.     MIL-T-21309 obsolete Screw Thread Inserts (STI)

72.     SAE Numbering Paradigm

73.     Unified National Thread: ANSI vs. BS vs. ISO vs. JIS

74.     V-1 (ANSI/ASME/CGA) Compressed Gas Cylinder Valve Outlet and Inlet Connections

UN Series Gages

1.        2AG Class-of-Fit

2.        3BG Class-of-Fit

3.        Controlled Root Radius on External Screw Threads

4.        Controlled Root Radius on Internal Screw Threads

5.        N vs. UN

6.        STI Gage Before or After Inserted

7.        STI Gage Tolerances

8.        Unified National Thread: ANSI vs. BS vs. ISO vs. JIS

9.        UN vs. UNC vs. UNF vs. UNEF vs. UNS

10.     UNJ vs. UN

11.     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 many steps should a Pipe Gage have?

9.        How to Use: NPT; ANPT; NPTF

10.     NPSF into NPSM (Dry Seal Combination)

11.     NPT vs. ANPT (Aeronautical National Pipe Taper)

12.     NPT vs. NGT (National Gas Taper)

13.     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.        User's Manuals for Variable Thread Measurement Systems

6.        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.        Gage Certifications do NOT Match the Gage Specification.

8.        ISO-7

9.        ISO-7 Rp into R (Dry Seal Combination)

10.     ISO-228

11.     ISO-228 Class A vs. Class B

12.     Rp vs. G

13.     Rs vs. G

14.     Full Form vs. Truncated or Modified

15.     ISO-7 vs. BS-21

16.     Designations of British Screw Thread Types

17.     DIN-240-1923 vs BS-84

18.     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