Thread Form Profiles
Thread form accuracy is important if two connections are to make-up properly. Using a Thread Profile Gage is a quick way to check your threads for proper form and pitch.
Thread form is defined as its profile in an axial plane for a length of one pitch. Simply place the correct form into the threads and by shining a light behind the profile, it’s possible to detect any signs or symptoms of a chipped insert. A profile template that stands too far out of the threads or allows excess light to shine through can be an indication of lead error. Sweeping the profile template along the helix of the threads helps find burrs and debris. Profile gages can also be be used to detect steps, flat crested threads, stretched threads, wide first threads, or rolled over threads.
Verifying thread form is a highly recommended practice industry wide for both straight and tapered thread manufacturers.
Straight Thread Form Profile Gages
Gagemaker manufactures precision straight thread profile gages for quick identification of a straight thread form (ANSI, ISO, etc.). Specify thread type and pitch to be inspected when ordering. Special form profiles are available.
Order Example: TP-UNVI-2P, TP-UNVE-4P, TP-SA-8P, etc.
| Thread Form | External/Internal | Description | Model |
|---|---|---|---|
| ACME | External/Internal | External/Internal general purpose ACME thread form profile gage | TP-GPA-__P |
| ISO Metric | External | External ISO Metric series thread form profile gage | TP-ME-__P |
| ISO Metric | Internal | Internal ISO Metric series thread form profile gage | TP-MI-__P |
| Stub ACME | External/Internal | External/Internal Stub ACME thread form profile gage | TP-SA-__P |
| Stub ACME Modified – 1 | External/Internal | External/Internal Stub ACME Modified 1 thread form profile gage | TP-SAM1-__P |
| Stub ACME Modified – 2 | External/Internal | External/Internal Stub ACME Modified 2 thread form profile gage | TP-SAM2-__P |
| UN Series | External | External UN series thread form profile gage | TP-UNVE-__P |
| UN Series | Internal | Internal UN series thread form profile gage | TP-UNVI-__P |
| 7 X 45 Buttress | External/Internal | External/Internal 7° x 45° Buttress thread form profile gage | TP-745-__P |
Tapered Thread Form Profile Gages
Gagemaker manufactures precision tapered thread profile gages for the quick identification thread for identification for both Rotary Shouldered Connections and Tubing & Casing. When ordering, specify the connection to be inspected. Special profiles will be quoted upon request.
| Connection Type | Connection Size | TPI | TPF | Thread Form | Model |
|---|---|---|---|---|---|
| Hughes External Flush | 2⅜" – 2⅞" | 6 | 2" | V-0.032 | TP-6-2-32 |
| API Full Hole | 4" | 4 | 2" | V-0.038R | TP-4-2-38 |
| API Numbered Connections | #23 – #50 | 4 | 2" | V-0.038R | TP-4-2-38 |
| Double Streamline | 3½" – 5½" | 4 | 2" | V-0.038R | TP-4-2-38 |
| Hughes External Flush | 3½" – 4½" | 4 | 2" | V-0.038R | TP-4-2-38 |
| Hughes Xtra Hole | 2⅞" – 5" | 4 | 2" | V-0.038R | TP-4-2-38 |
| Hughes Slim Hole | 2⅜" – 4½" | 4 | 2" | V-0.038R | TP-4-2-38 |
| Internal Flush | 2⅜" – 6⅝" | 4 | 2" | V-0.038R | TP-4-2-38 |
| Wide Open | 2⅜" – 4½" | 4 | 2" | V-0.038R | TP-4-2-38 |
| API Numbered Connections | #56 – #84 | 4 | 3" | V-0.038R | TP-4-3-38 |
| API Full Hole | 2⅞", 3½", & 4½" | 5 | 3" | V-0.040 | TP-5-3-40 |
| API Regular | 2⅜" – 4½" | 5 | 3" | V-0.040 | TP-5-3-40 |
| API Regular | 6⅝" | 4 | 2" | V-0.050 | TP-4-2-50 |
| API Full Hole | 5½" & 6⅝" | 4 | 2" | V-0.050 | TP-4-2-50 |
| API Regular | 5½", 7⅝", & 8⅝" | 4 | 3" | V-0.050 | TP-4-3-50 |
| API Numbered Connections | #10, #12, #13, & #16 | 6 | 1.5" | V-0.055 | TP-6-1.5-55 |
| API Regular (Macaroni Tubing) | 1" – 1.5" | 6 | 1.5" | V-0.055 | TP-6-1.5-55 |
| P.A.C. Connections | 2⅜" – 3½" | 4 | 1.5" | V-0.076 | TP-4-1.5-76 |
| American Open Hole | 2⅜" – 4½" | 4 | 1.5" | V-0.076 | TP-4-1.5-76 |
| Hughes H-90 | 3½" – 6⅝" | 3.5 | 2" | 90-V-0.050 | TP-3.5-2-50 |
| Hughes H-90 | 7" – 8⅝" | 3.5 | 3" | 90-V-0.050 | TP-3.5-3-50 |
| Hughes Slimline H-90 | 2⅜" – 3½" | 3 | 1.25" | 90-V-0.084 | TP-3-1.25-84 |
| Connection Type | External/Internal | TPI | TPF | Thread Form | Description | Model |
|---|---|---|---|---|---|---|
| API 8-Round Casing, Tubing & Drill Pipe | External/Internal | 8 | ¾" | 8 Round | External/Internal API 8 Round thread form profile gage | TP-RTC-8R |
| API 10-Round Tubing | External/Internal | 10 | ¾" | 10 Round | External/Internal API 10 Round thread form profile gage | TP-RTC-10R |
| 8V API Line Pipe | External/Internal | 8 | ¾" | 8 V Thread | External/Internal 8V Line Pipe thread form profile gage | TP-8V |
| 11½ V API Line Pipe | External/Internal | 11½ | ¾" | 11½ V Thread | External/Internal 11½V Line Pipe thread form profile gage | TP-11-1/2V |
| 4½" – 13⅝" API Buttress Casing | External | 5 | ¾" | API Buttress | External 4½" – 13⅝" API Buttress Casing thread form profile gage | TP-5BTC75-EXT |
| 4½" – 13⅝" API Buttress Casing | Internal | 5 | ¾" | API Buttress | Internal 4½" – 13⅝" API Buttress Casing thread form profile gage | TP-5BTC75-INT |
| 16" – 20" API Buttress Casing | External | 5 | 1" | API Buttress | External 16" – 20" API Buttress Casing thread form profile gage | TP-5BTC1-EXT |
| 16" – 20" API Buttress Casing | Internal | 5 | 1" | API Buttress | Internal 16" – 20" API Buttress Casing thread form profile gage | TP-5BTC1-INT |
Other Form Profiles
Gagemaker also manufactures precision form profile gages for NPT Threads as well as Tool Grinding and Setting Gages for 60° and 90° threads. When ordering, specify the connection to be inspected. Special profiles will be quoted upon request.
| Thread Form | TPI | TPF | Thread Form | Description | Model |
|---|---|---|---|---|---|
| NPT Threads | 8 | ¾" | NPT | External/Internal NPT thread form profile gage | TP-NPT-8 |
| NPT Threads | 11.5 | ¾" | NPT | External/Internal NPT thread form profile gage | TP-NPT-11-1/2 |
| NPT Threads | 14 | ¾" | NPT | External/Internal NPT thread form profile gage | TP-NPT-14 |
| 60° & 90° Threads | – | – | 60° & 90° Threads | 60° & 90° Threads Tool Grinding & Setting Gage | TP–9060LS |