China Factory Suppliers of API-1 Square and Hexagonal Kellys for Durable Drilling Operations
100% non-destructive testing (NDT) of critical stress areas
Threads undergo cold rolling for enhanced fatigue resistance
Each kelly is traceable via heat number and serialized documentation
Compliance with API Spec 7, ISO 9001, and regional safety standards
Kellys are made from AISI 4145H modified alloy bars which are quenched and tempered to full length. A hardness range of 285 to 341 BHN and a minimum impact value of 40 ft-lbs. All ends and center drive sections are machined. The kellys are precision-trepanned to provide true bores.
| Nom. Size (in) |
Top Connection(LH) | Bottom Connection | I.D. (in) | Drive Section | ||||
| (in) | ||||||||
| Standard O.D.(in) |
Optional O.D.(in) |
Square O.D.(in) |
Hex. O.D.(in) |
Square | Hex. | A | B | |
2 1/2 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC26 |
|
1 1/4 |
|
3 2/7 |
|
3 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC31 4-1/8 |
NC26 3-3/8 |
1 3/4 |
1 1/4 |
4 |
3 3/8 |
3 1/2 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC38 4-3/4 |
NC31 4-1/8 |
2 1/4 |
1 3/4 |
4 1/2 |
4 |
4 1/4 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC46 6-1/4 |
NC38 4-3/4 |
2 4/5 |
2 1/4 |
5 4/7 |
4 4/5 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC50 6-3/8 |
NC38 4-3/4 |
2 4/5 |
2 1/4 |
5 4/7 |
4 4/5 |
|
5 1/4 |
6-5/8REG 7-3/4 |
|
5-1/2FH 7 |
NC46 6-1/4 |
3 1/4 |
3 |
7 |
6 |
6-5/8REG 7-3/4 |
|
NC56 7 |
NC50 6-3/8 |
3 1/4 |
3 1/4 |
7 |
6 |
|
6 |
6-5/8REG 7-3/4 |
|
|
5-1/2FH 7 |
|
3 1/2 |
|
6 4/5 |
6-5/8REG 7-3/4 |
|
|
NC56 7 |
|
3 1/2 |
|
6 4/5 |
|
| Connection | Hole Size | Fishing Neck | ID | OAL | Fishing Neck length | Blade Length | Blade Width |
8-5/8 REG Box x pin |
42" |
11" |
3" |
118-130" |
32" |
24" |
6.5" |
7-5/8 REG Box x pin |
36" |
9.5" |
3" |
110-120" |
30" |
22" |
6.5" |
7-5/8 REG Box x pin |
28" |
9.5" |
3" |
100-110" |
30" |
20" |
4" |
7-5/8 REG Box x pin |
26" |
9.5" |
3" |
100-110" |
30" |
20" |
4" |
7-5/8 REG Box x pin |
24" |
9.5" |
3" |
100-110" |
30" |
20" |
4" |
7-5/8 REG Box x pin |
22" |
9.5" |
3" |
100-110" |
30" |
20" |
4" |
7-5/8 REG Box x pin |
17 1/2" |
9.5" |
3" |
90-100" |
30" |
18" |
3.5" |
7-5/8 REG Box x pin |
16" |
9.5" |
3" |
90-100" |
30" |
18" |
3.5" |
6-5/8 REG Box x pin |
12 1/2" |
8" |
2 13/16" |
79-90" |
30" |
18" |
3" |
7-5/8 REG Box x pin |
12 1/4" |
8" |
2 13/16" |
79-90" |
30" |
18" |
3" |
4 1/2 IF Box x pin |
8 1/2" |
6 3/4" |
2 13/16" |
65-72" |
28" |
16" |
2.25" |
3-1/2 IF Box x pin |
6" |
4 3/4" |
2 1/4" |
60-66" |
28" |
16" |
2" |