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About
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Engineering
Not all crest designs are created equal. While traditional crest flats serve their purpose, Jarvis Cutting Tools elevates performance with a precision-ground Crest Radius—delivering built-in edge prep, dramatically extended tap life, and stronger, more reliable API threads.
INFORMATION
Jarvis Cutting Tools grinds a crest radius on the major diameter of the tap. Traditionally, taps are produced with Crest Flats. This truncated thread form works well in some applications, but Jarvis ground Crest Radius has significant advantages in a wide variety of applications, especially API threads. The Crest Radius provides an “Edge Prep” for forming taps. The rounded shoulders can dramatically increase tap life and create much stronger threads. In fact, there are many applications which now specify Jarvis’ Crest Radius because of the extra strength and performance they provide!
North & South American API Tap
| Part Numbers | ||||||
|---|---|---|---|---|---|---|
| Tap Size | A | B | C | Pitch Diameter | With Notch | Without Notch |
| 5/8-10 | .370 | .500 | .748 | .8800 | R841795T | R841798T |
| 3/4-10 | .464 | .625 | .824 | 1.0055 | R843487T | R858450T |
| 7/8-10 | .557 | .750 | .994 | 1.1305 | R843488T | R840700T |
| 1" – 10 | .600 | .875 | 1.186 | 1.3185 | R841813T | R841115T |
| 1-1/18-10 | .750 | 1.000 | 1.354 | 1.5061 | R841814T | R841828T |
Asian API Tap
| Tap Size | A | B | C | Pitch Diameter | Part Numbers |
|---|---|---|---|---|---|
| 5/8-10 | .696 | .710 | 6.693 | .8800 | R864148T |
| 3/4-10 | .696 | .926 | 6.772 | 1.0055 | R864826T |
| 7/8-10 | .696 | .926 | 6.772 | 1.1305 | R868411T |
| 1" – 10 | .696 | .946 | 6.772 | 1.3185 | R864827T |
| 1-1/18-10 | .853 | 1.104 | 7.300 | 1.5061 | R864828T |
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