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The lead gage inspects thread lead using contact points that seat in the threads of a part. Thread lead is the distance between threads, measured on a plane parallel to the centerline of the threaded part. A thread’s pitch determines the diameter of the required contact points.
Thread Lead Gages inspect both internal and external thread lead for a variety of thread forms and provide dimensional verification of product print data on the integrity of your threads. Gagemaker has both two-point and three-point system lead gages that are designed to accurately inspect lead for ACME, Stub ACME, UN, and API threads.
The LG-6001 and the LG-6002 use a two-point system to inspect thread lead for straight and tapered threads. The LG-6002 inspects both external and internal threads, while the LG-6001 inspects external threads. The two point system allows for a sweeping action to obtain the measurement. Both gages are available with higher resolution indicators.
The LG-5003 uses the three-point system to inspect internal and external thread lead. Two fixed contact points at the rear of the gage and one moveable contact point at the front of the gage provide complete stability when taking thread lead measurements. This unique design does not require sweeping to obtain measurements.
| Number of Contact Points | Thread Length Range | External/Internal | Minimum Bore | Indicator Travel | Indicator Resolution | Contact Point Spacing | Description | Model |
|---|---|---|---|---|---|---|---|---|
| 2 | ½” – 2” (12.7 mm – 50.8 mm) | External | 2.750” | .100" | .0005” | .200” | 2-point external lead gage | LG-6001 |
| 2 | ½” – 2”(12.7 mm – 50.8 mm) | External | 2.750” | .025” | .0001” | .200” | 2-point external lead gage, ¼” travel, .0001” resolution | LG-6001-1 |
| 2 | ½” – 4” (0 mm – 101.6 mm) | Internal | 1.450” | .100" | .0005” | .200” | 2-point internal lead gage | LG-6002 |
| 2 | ½” – 4” (0 mm – 101.6 mm) | Internal | 1.450” | .025” | .0001” | .200” | 2-point internal lead gage, ¼” travel, .0001” resolution | LG-6002-1 |
| 2 | ½” – 4” (0 mm – 101.6 mm) | Internal | 1.450” | 5 mm | .01 mm | .200” | 2-point internal lead gage with metric indicator | LG-6002-M |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.340” | .100" | .0005” | .500” | 3-point external/internal lead gage | LG-5003 |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.340” | .025” | .0001” | .500” | 3-point external/internal lead gage, ½” travel, .0001” resolution | LG-5003-1 |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.340” | .100" | .0005” | .193” | 3-point external/internal lead gage | LG-5003-J |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.340” | .025” | .0001” | .193” | 3-point external/internal lead gage, ½” travel, .0001” resolution | LG-5003-1J |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 34 mm | 5 mm | .01 mm | 12.7 mm | 3-point external/internal lead gage with metric indicator | LG-5003-M |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.500” | .100" | .0005” | .167” | Load to load 3-point external/internal lead gage | LG-5003-L |
| 3 | ½” – 4” (0 mm – 101.6 mm) | External/Internal | 1.500” | .100" | .0005” | .167” | Stab to stab 3-point external/internal lead gage | LG-5003-S |
Gagemaker’s precision lead gage setting standards are manufactured in accordance with ANSI Specifications, API Specification 5B, and API Specification 7-2. Lead gage standards are used to set the gage prior to inspection.
| Connection | Pitch | TPI | TPF | Thread Form | Description | Model |
|---|---|---|---|---|---|---|
| 8 Round & 10 Round | - | 8 & 10 | ¾” | EUE, NUE, LTC, STC | Lead standard for all 8 Round casing, tubing & drill pipe; 10 Round tubing | LS-1001 |
| Straight | 6-18 | 6-18 | - | Straight | Lead standard for straight threads, 6-18 pitch, 4” length, .375” width | LS-1002 |
| 11½ Pitch "V" Threads | - | 11½ | ¾” | Line Pipe & NPT | Lead standard for 11½ Pitch "V" Threads | LS-1003 |
| Straight & NPS | 11½ | 11½ | - | Straight & NPS | Lead standard for straight threads, NPS threads | LS-1004 |
| 4½” - 13⅜” Buttress | - | 5 | ¾” | Buttress | Lead standard for ¾” Buttress | LS-1005 |
| 16” & Larger Buttress | - | 5 | 1” | Buttress | Lead standard for 1” Buttress | LS-1006 |
| Hughes External Flush 2⅜” - 2⅞” | - | 6 | 2” | V-0.032 | Lead standard for 6 TPI, 2” TPF, V-0.032 | LS-1007 |
| API Full Hole 4”, 5½” & 6⅝” ; API Numbered Connections #23 - #50; API Regular 6⅝” ; Double Streamline 3½” - 5½”; Hughes Slim Hole 2⅜” - 4½”; Hughes Xtra Hole 2⅞” - 5”; Hughes External Flush 3½” - 4½”; Internal Flush 2⅜” - 6⅝” ; Wide Open 2⅜” - 4½” | - | 4 | 2” | V-0.038R & V-0.050 | Lead standard for 4 TPI, 2” TPF, V-0.038R, & V-0.050 thread forms | LS-1007 |
| API Numbered Connections #56 - #84 & API Regular 5½”, 7⅝”, & 8⅝” | - | 4 | 3” | V-0.038R & V-0.050 | Lead standard for 4 TPI, 3” TPF, V-0.038R, & V-0.050 thread forms | LS-1008 |
| API Full Hole 2⅞”, 3½”, & 4½” & API Regular 2⅜” - 4½” | - | 5 | 3” | V-0.040 | Lead standard for 5 TPI, 3” TPF, V-0.040 thread forms | LS-1009 |
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