Tool Joint Threads – Dimensions and Strength Data
(All types—API and Hydril joints)
| Size, Inches | TYPE | O.D. (Std.) Inches | I.D. (Std.) Inches | Pin Length Inches | Thds. Per Inch | Pitch Diameter at Gage Point Inches | O.D. of Pin at Base Inches | JOINT STRENGTH |
Recommended Make-Up Torque Ft. Lbs. | |
|---|---|---|---|---|---|---|---|---|---|---|
| Min. Tensile Yield Strength (Calc.) Lbs. | Torsional Ultimate Strength (Experimental) Ft. Lbs. | |||||||||
| 2 3/8 | API “IF” Hydril “IF” API Regular Hydril “F” | 3 3/8 3 3/8 3 1/8 2 7/16 | 1 3/4 1 3/4 1 1 | 3 3 15/16 3 2 9/16 | 4 3 5 4 | 2.668 – 2.365 – | 2.876 2.806 2.625 1.926 | 337,000 384,000 391,100 207,000 | 9,500 12,500 7,500 5,000 | 2,700 3,800 2,200 1,600 |
| 2 7/8 | API “IF” Hydril “IF” API Regular Hydril “SH” Hydril “F” | 4 1/8 3 7/8 3 3/4 3 3/8 2 15/16 | 2 1/8 2 3/32 1 1/4 1 3/4 1 1/4 | 3 1/2 3 15/16 3 1/2 3 15/16 3 9/16 | 4 3 5 3 4 | 3.183 – 2.740 – – | 3.391 3.181 3.000 2.806 2.367 | 478,340 460,000 514,250 384,000 366,000 | 17,500 17,500 21,000 12,500 9,000 | 5,400 5,400 5,400 4,300 2,700 |
| 3 1/2 | API “IF” Hydril “IF” Hydril “Extra Hole” Hydril “EIU” API Full Hole API Regular Double Streamline Hydril “SH” Hydril “F” | 4 3/4 4 1/2 4 3/4 4 5/8 4 5/8 4 1/4 3 7/8 3 7/8 3 9/16 | 2 11/16 2 11/16 2 7/16 2 7/16 2 7/16 1 1/2 1 13/16 2 3/32 1 1/2 | 4 3 15/16 3 1/2 4 1/4 3 3/4 3 3/4 4 3 15/16 4 | 4 3 4 3 5 5 4 3 3 | 3.808 – 3.604 – 3.734 3.240 3.119 – – | 4.016 3.837 3.812 3.741 3.994 3.500 3.327 3.181 2.806 | 627,000 613,000 608,900 670,000 690,000 727,400 561,120 460,000 463,000 | 20,000 28,000 24,000 30,000 22,000 22,000 14,000 17,000 16,000 | 6,500 6,500 6,500 6,500 6,500 6,500 5,400 5,400 4,300 |
| 4 | API “IF” Hydril “EIU” API Full Hole Double Streamline Hydril “SH” Hydril “F” | 5 3/4 5 9/16 5 1/4 4 1/2 4 1/2 4 1/16 | 3 1/4 3 1/8 2 13/16 2 3/8 2 9/16 2 | 4 1/2 4 5/16 4 1/2 4 3 15/16 3 15/16 | 4 3 4 4 3 3 | 4.626 – 4.072 3.678 – – | 4.834 4.661 4.280 3.886 3.837 3.337 | 957,050 950,000 757,500 689,620 678,000 593,000 | 43,000 51,000 31,000 32,000 31,000 28,000 | 11,400 11,400 6,500 6,500 6,500 5,400 |
| 4 1/2 | API “IF” Hydril “IF” Hydril “Extra Hole” Hydri; “EIU” API Full Hole API Regular Double Streamline Hydril “SH” Hydril “F” | 6 1/18 6 6 5 3/4 5 3/4 5 1/2 5 5 4 9/16 | 3 3/4 3 3/4 3 1/4 3 5/32 3 2 1/4 2 11/16 2 11/16 2 3/8 | 4 1/2 4 4 1/2 4 7/16 4 4 1/4 4 1/2 4 1/8 3 15/16 | 4 3 4 3 5 5 4 3 3 | 5.042 – 4.626 – 4.532 4.365 4.072 – – | 5.250 5.201 4.834 4.739 4.792 4.625 4.280 4.191 3.837 | 999,000 1,025,000 957,050 997,000 1,017,000 1,262,000 817,500 814,000 853,000 | 50,000 60,000 43,000 55,000 45,000 40,000 31,000 39,000 35,000 | 11,400 11,400 11,400 11,400 11,400 11,400 8,700 8,700 6,500 |
