API Gages Working & Master Gages - Hemco
AMERICAN PETROLEUM INSTITUTE (API) Gages are On Sale at Gaging.com LLC!
The American Petroleum Institute (A.P.I.) establishes a controlled gaging program to insure API thread form specifications are met in the production of oil field equipment, tools and pipe. A.P.I. requires that those manufacturers using the A.P.I. monogram inspect these components with working gages set to A.P.I. master gages. Our supplier HEMCO, is licensed by the Institute to use the A.P.I. monogram on all the API Spec 5B, Spec 7-2 and Spec 11B Master gages we sell.
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| API Specification & Other Connections | ||||
| Specification | Type | Size Range | Threads per Inch (TPI) | Taper per Foot |
| SPEC 5B | Buttress Casing (BUTTRESS CSG) | 4-1/2 thru 13-3/8 | 5 | 3/4" Taper |
| External Upset (UP TBG) | 1.050 thru 1.900 | 10 | ||
| External Upset (UP TBG) | 2-3/8 thru 4-1/2 | 8 | ||
| Non-Upset Tubing (TBG) | 1.050 thru 3-1/2 | 10 | ||
| Non-Upset Tubing (TBG) | 4", 4-1/2" | 8 | ||
| Round Casing (CSG) | 4-1/2 thru 13-3/8 | 8 | ||
| Standard Line Pipe (LP) | 1/8 thru 12 | 27 through 8 TPI | ||
| SPEC 7-2 | Numbered Connections | NC23 through NC50 | 4 | 2" taper |
| Numbered Connections | NC56 through NC70 | 4 | 3" taper | |
| Regular Rotary (left hand also) | 6-5/8" | 4 | 2" taper | |
| Regular Rotary (left hand also) | 5-1/2, 7-5/8, 8-5/8 | 4 | 3" taper | |
| Regular Rotary (left hand also) | 2-3/8 thru 4-1/2 | 5 | 3" taper | |
| Regular Rotary (left hand also) | 1", 1-1/2" | 6 | 1-1/2" taper | |
| Full Hole | 5-1/2, 6-5/8 | 4 | 2" taper | |
| SPEC 11B | Sucker Rods | 5/8" thru 1-1/8" | 10 | Not Tapered |
| Spec 11AX | B Connection | 178 | 11.5 | 3/8" taper |
| B Connection | 225, 275 | 11.5 | 3/4" taper | |
| L Connection | 3/8, 1/2, 3/4 | 18, 14, 14 | 3/4" taper | |
| Spec 6A | Non-Upset Sharp Vee (VR Threads) | 1-1/2 thru 3" | 11.5 | 3/4" taper |
| Other Connections | Buttress Tubing (Improved) | 2-3/8, 2-7/8, 3-1/2 | 8 | 3/4" taper |
| Extra Hole | 2-7/8 & 3-1/2 | 4 | 2" taper | |
| Full Hole | 2-7/8, 3-1/2, 4-1/2 | 5 | 3" taper | |
| Full Hole (left hand) | 5-1/2, 6-5/8 | 4 | 2" taper | |
| Internal Flush (left hand also) | 5-1/2, 6-5/8 | 4 | 2" taper | |
| PAC Tools | 2-3/8, 2-7/8 | 4 | 1-1/2" taper | |
| Regular H90 | 3-1/2 thru 8-5/8 | 3.5 | 2" taper | |
| Slimiline H90 | 2-3/8, 2-7/8, 3-1/2 | 3 | 1-1/4" taper | |
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