Thread Height，Gagemaker manufactures thread height gages for both external and internal threaded connections for a variety of forms and sizes (tapered or straight)
From detecting a chipped tool to preventing a connection from pulling apart under critical loads, inspecting thread height is valuable. Gagemaker manufactures thread height gages for both external and internal threaded connections for a variety of forms and sizes (tapered or straight). These gages provide immediate feedback on the integrity of your threads. Our thread height gages are designed for various thread types, forms, and sizes.
Thread height is the distance between the crest and the root of the thread, normal to the axis of the thread. Several issues are easily detected by simply inspecting thread height.
Proper thread height maximizes the performance of any threaded connection. Thread height inspection is required by API. Thread height affects the interchangeability and the integrity of the threaded assembly.
External Thread Height Gages
Gagemaker manufactures many models of external thread height gages. Specify the type of thread when ordering.
Some gages require a setting standard, see below for standards.
Contact point listed in description (e.g. T072) is included, but may specify other.
| Connection | Min. Bore | Indicator Travel | Indicator Resolution | Dial Type | Included Contact Point* | Standard required | Description | Model |
|---|---|---|---|---|---|---|---|---|
| USS Improved Buttress | 2.950” | .250” | .001” | 0-25-0, Balanced | TBR | Yes | External Thread Height Gage for USS Improved Buttress, 0-25-0, T500C-USS | TH-3000-USS |
| ¾” TPF Buttress | 2.930” | .250” | .0005” | 0-25-0, Balanced | T072 | Yes | External Thread Height Gage, 0-25-0, T072 | TH-3002B** |
| ¾” TPF Buttress | 3.730” | .500" | .0001” | 0-10-0, Balanced | T072 | Yes | External Thread Height Gage, 0-10-0, .0001” Resolution Indicator, T072 | TH-3002B-1 |
| ¾” TPF Buttress | 2.930” | 5 mm | .01 mm | 0-50-0, Balanced | T072 | Yes | External Thread Height Gage, 0-50-0, Metric Indicator, T072 | TH-3002B-M** |
| 1” TPF Buttress | 2.930” | .250” | .0005” | 0-25-0, Balanced | T072 | Yes | External Thread Height Gage with Step Base, 0-25-0, T072 | TH-3003B |
| 1” TPF Buttress | 3.730” | .250” | .0001” | 0-10-0, Balanced | T072 | Yes | External Thread Height Gage with Step Base, 0-10-0, .0001” Resolution Indicator, T072 | TH-3003B-1 |
| 8 Round | 3.400” | .185” | .001” | 0-100 Continuous | T501 | No | External Thread Height Gage, 0-100, T501 | TH-3001R |
| 8 Round | 4.25” | .190” | .0001” | 0-5-0, Balanced | T501 | Yes | External Thread Height Gage, 0-5-0, .0001” Resolution Indicator, T501 | TH-3001R-1 |
| 8 Round | 3.400” | .162”/4.1 mm | .01 mm | 0-10-0, Balanced | T501 | Yes | External Thread Height Gage, 0-10-0, Metric Indicator, T501 | TH-3001R-M |
| 8 Round & 10 Round | 3.400” | .162” | .001” | 0-50-0, Balanced | T501 | Yes | External Thread Height Gage, 0-50-0, T501 | TH-3002R |
| 8 Round & 10 Round | 4.25” | .500" | .0001” | 0-10-0, Balanced | T501 | Yes | External Thread Height Gage, 0-10-0, .0001” Resolution Indicator, T501 | TH-3002R-1 |
| 8 Round & 10 Round | 3.400” | 5 mm | .01 mm | 0-50-0, Balanced | T501 | Yes | External Thread Height Gage, 0-50-0, Metric Indicator, T501 | TH-3002R-M |
| Rotary Shouldered Connections, Tool Joints | 2.930” | .250” | .0005” | 0-25-0, Balanced | T072 | Yes | External Thread Height Gage, 0-25-0, T072 | TH-3000-RSC |
| Rotary Shouldered Connections, Tool Joints | 3.730” | .250" | .0001” | 0-25-0, Balanced | T072 | Yes | External Thread Height Gage, 0-25-0, .0001” Resolution Indicator, T072 | TH-3000-RSC-1 |
| Rotary Shouldered Connections, Tool Joints | 2.930” | 5 mm | .01 mm | 0-50-0, Balanced | T072 | Yes | External Thread Height Gage, 0-50-0, Metric Indicator, T072 | TH-3000-RSC-M |
| UN/UNJ/UNR, ACME, Stub ACME, Stub ACME Modified 1, Stub ACME Modified 2, Metric M & MJ, 7° X 45° Buttress, Line Pipe, and General Purpose Pipe Threads | 2.930" | .196” | .001” | 0-100, Continuous | T500C | No | External Thread Height Gage, 0-100, T500C | TH-3001V |
| UN/UNJ/UNR, ACME, Stub ACME, Stub ACME Modified 1, Stub ACME Modified 2, Metric M & MJ, 7° X 45° Buttress, Line Pipe, and General Purpose Pipe Threads | 3.730” | .500" | .0001” | 0-10-0, Balanced | T500C | Yes | External Thread Height Gage, 0-10-0, .0001” Resolution Indicator, T500C | TH-3001V-1 |
| UN/UNJ/UNR, ACME, Stub ACME, Stub ACME Modified 1, Stub ACME Modified 2, Metric M & MJ, 7° X 45° Buttress, Line Pipe, and General Purpose Pipe Threads | 2.930” | .250" | .0005” | 0-10-0, Balanced | T500C | Yes | External Thread Height Gage, 0-10-0, .0005” Resolution Indicator, T500C | TH-3001V-5 |
| UN/UNJ/UNR, ACME, Stub ACME, Stub ACME Modified 1, Stub ACME Modified 2, Metric M & MJ, 7° X 45° Buttress, Line Pipe, and General Purpose Pipe Threads | 2.930” | 5 mm | .01 mm | 0-10-0, Balanced | T500C | Yes | External Thread Height Gage, 0-10-0, Metric Indicator, T500C | TH-3001V-M |
| Line Pipe, Tool Joints | 2.930” | .250” | .001” | 0-50-0, Balanced | T500C | Yes | External Thread Height Gage, 0-50-0, T500C | TH-3002V |
| Line Pipe, Tool Joints | 3.730” | .500" | .0001” | 0-10-0, Balanced | T500C | Yes | External Thread Height Gage, 0-50-0, .0001” Resolution Indicator, T500C | TH-3002V-1 |
*TH-3002B and TH-3002B-M also serve as an external thread addendum (shave) gage, THS-1014S standard required
Gagemaker also manufactures several models of internal thread height gages. Please specify the type of thread when ordering.
Some gages require a setting standard, see below for standards.
Contact point listed in description (e.g. T072) is included, but may specify other.
| Connection | Min. Bore | Indicator Travel | Indicator Resolution | Dial Type | Included Contact Point* | Standard required | Description | Model |
|---|---|---|---|---|---|---|---|---|
| Line Pipe | 1.50” | .250” | .0005” | 0-25-0, Balanced | T500C | Yes | Internal Thread Height Gage, 0-25-0, T500C | TH-3004 |
| Line Pipe | 1.50” | .250” | .0001” | 0-25-0, Balanced | T500C | Yes | Internal Thread Height Gage, 0-25-0, .0001” Indicator Resolution, T500C | TH-3004-1 |
| Line Pipe | 1.50"/38.1 mm | 10 mm | .01 mm | 0-50-0, Balanced | T500C | Yes | Internal Thread Height Gage, 0-50-0, Metric Indicator | TH-3004-M |
| 8 Round & 10 Round | 1.50” | .105” | .0005” | 0-25-0, Balanced | T502 and T503 | Yes | Internal Thread Height Gage, 0-25-0, T502 and T503 | TH-3006 |
| 8 Round & 10 Round | 1.50” | .105” | .0001” | 0-25-0, Balanced | T502 and T503 | Yes | Internal Thread Height Gage, 0-25-0, .0001” Indicator Resolution, T502 and T503 | TH-3006-1 |
| 8 Round & 10 Round | 1.50”/38.1 mm | 10 mm | .01 mm | 0-50-0, Balanced | T502 and T503 | Yes | Internal Thread Height Gage, 0-50-0, Metric Indicator | TH-3006-M |
| 8 Round & 10 Round | 1.575” | .500” | .0005” | 0-25-0, Balanced | T502 and T503 | Yes | Internal Thread Height Gage, 0-25-0, T502 and T503 | TH-3008 |
| ¾” TPF Buttress | 1.50” | .250” | .0005” | 0-25-0, Balanced | T072 | Yes | Internal Thread Height Gage, 0-25-0, T072 | TH-3009 |
| Rotary Shouldered Connections | 1.50” | .250” | .0005” | 0-25-0, Balanced | T072 | Yes | Internal Thread Height, 0-25-0, 1" Base Length, T072 | TH-3009-RSC |
| Rotary Shouldered Connections | 1.50” | .250” | .0001” | 0-10-0, Balanced | T072 | Yes | Internal Thread Height, 0-25-0, .0001” Indicator Resolution, 1" Base Length, T072 | TH-3009-RSC-1 |
| UN/UNJ/UNR, ACME, Stub ACME, Stub ACME Modified 1, Stub ACME Modified 2, Metric M & MJ, 7° X 45° Buttress, Line Pipe, and General Purpose Pipe Threads | 1.50” | .250” | .001” | 0-100 Continuous | T500C | No | Internal Thread Height, 0-100, 1" Base Length (TPD), T500 | TH-3010 |
| USS Improved Buttress | 1.50” | .250” | .001” | 0-25-0, Balanced | T500C-USS | Yes | Internal Thread Height, T500C-USS | TH-3010-USS |
| ¾” - 2" NPT, AMT | .750" | .250” | .005” | 0-25-0, Balanced | T500C | Yes | Internal Thread Height Gage, 0-25-0 | TH-3012 |
| ¾” - 2" NPT, AMT | .750" | .500” | .0001” | 0-10-0, Balanced | T500C | Yes | Internal Thread Height Gage, 0-25-0, .0001” Indicator Resolution | TH-3012-1 |
Tubing & Casing Standards
| Connection | TPF | Description | Thread Form | Model |
|---|---|---|---|---|
| 8 Round & 10 Round | ¾” | Thread Height Standard, 8 & 10 Round | EUE, NUE, LTC, STC | THS-1014 |
| 8 & 11½ Pitch "V" Threads | ¾” | Thread Height Standard, 8 & 11½ Pitch "V" Threads | Line Pipe & NPT | THS-1015 |
| 13⅜” & Smaller Buttress | ¾” | Thread Height Standard, ¾” Buttress | Buttress | THS-1017 |
| 16” & Larger Buttress | 1” | Thread Height Standard, 1” Buttress | Buttress | THS-1018 |
| USS Improved Buttress | ¾” | Thread Height Standard, USS Buttress | USS Improved Buttress | THS-10409 |
| Connection Type | Connection Size | TPI | TPF | Thread Form | Required Contact Point | Model |
|---|---|---|---|---|---|---|
| Hughes External Flush | 2⅜” - 2⅞” | 6 | 2” | V-0.032 | T034 | THS-10322-RS |
| API Numbered Connections | #23 - #50 | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Double Streamline | 3½” - 5½” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| API Full Hole | 4” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Hughes Slim Hole | 2⅜” - 4½” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Hughes External Flush | 3½” - 4½” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Hughes Xtra Hole | 2⅞” - 5” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Internal Flush | 2⅜” - 6⅝” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| Wide Open | 2⅜” - 4½” | 4 | 2” | V-0.038R | T072 | THS-10382-RS |
| API Numbered Connections | #56 - #84 | 4 | 3” | V-0.038R | T072 | THS-10383-RS |
| API Regular | 2⅜” - 4½” | 5 | 3” | V-0.040 | T034 | THS-10403-RS |
| API Full Hole | 2⅞”, 3½”, & 4½” | 5 | 3” | V-0.040 | T034 | THS-10403-RS |
| API Regular | 6⅝” | 4 | 2” | V-0.050 | T044 | THS-10502-RS |
| API Full Hole | 5½” & 6⅝” | 4 | 2” | V-0.050 | T044 | THS-10502-RS |
| API Regular | 5½”, 7⅝”, & 8⅝” | 4 | 3” | V-0.050 | T044 | THS-10503-RS |
| API Numbered Connections | #10, #12, #13, #16 | 6 | 1.5” | V-0.055 | T072 | THS-10551.5-RS |
| API Regular (Macaroni Tubing) | 1” - 1.5” | 6 | 1.5” | V-0.055 | T072 | THS-10551.5-RS |
| American Open Hole | 2⅜” - 4½” | 4 | 1.5” | V-0.076 | T044 | THS-10761.5-RS |
| P.A.C. Connections | 2⅜” - 3½” | 4 | 1.5” | V-0.076 | T044 | THS-10761.5-RS |
| Hughes H-90 | 2⅜” - 3½” | 3.5 | 2” | 90-V-0.050 | T072 | THS-10H90-2 |
| Hughes H-90 | 7” - 8⅝” | 3.5 | 3” | 90-V-0.050 | T072 | THS-10H90-3 |
| Hughes Slimline H-90 | 2⅜” - 3½” | 3 | 1” | 90-V-0.084 | T072 | THS-SL-H90 |
| Connection | Min. Bore | Indicator Travel | Indicator Resolution | Dial Type | Required Contact Point* | Standard required | Description | Model |
|---|---|---|---|---|---|---|---|---|
| 8 Round | 2.930” | .250” | .0005” | 0-25-0, Balanced | T072 | TAS-1014 | External Addendum Gage, 0-25-0, T072 | TA-3002 |
| 10 Round | 2.930” | .250” | .0005” | 0-25-0, Balanced | T057 | TAS-1014 | External Addendum Gage, 0-25-0 | TA-3002 |
| 8 Round | 3.730” | .500" | .0001” | 0-10-0, Balanced | T072 | TAS-1014 | External Addendum Gage, 0-10-0, .0001” Resolution Indicator, T072 | TA-3002-1 |
| 10 Round | 3.730” | .500" | .0001” | 0-10-0, Balanced | T057 | TAS-1014 | External Addendum Gage, 0-10-0, .0001” Resolution Indicator | TA-3002-1 |
| 8 Round | 2.930” | 5 mm | .01 mm | 0-50-0, Balanced | T072 | TAS-1014 | External Addendum Gage, 0-50-0, Metric Indicator, T072 | TA-3002-M |
| 10 Round | 2.930” | 5 mm | .01 mm | 0-50-0, Balanced | T057 | TAS-1014 | External Addendum Gage, 0-50-0, Metric Indicator | TA-3002-M |
| 8 Round | 0.750" | .250” | .0005” | 0-25-0, Balanced | T072 | TAS-1014 | Internal Addendum Gage, 0-25-0, T072 | TA-3012 |
| 10 Round | 0.750" | .250” | .0005” | 0-25-0, Balanced | T057 | TAS-1014 | Internal Addendum Gage, 0-25-0 | TA-3012 |
*T072 is included with every TA-3002. A T057 for 10 Round is sold separately.
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