KELLYS - Products & Services - Beijing Olymtech Development Co., Ltd

Kellys can be made from 4145H modified alloy steel in accordance with API Spec.7-1 latest edition, which are quenched and tempered along full length. A hardness range of 285 to 341 BHN and a minimum impact value of 54 Joules as per ASTM A 370 Charpy-V, these values are guaranteed one inch below the surface. SFMC kelly bars are inspected by an ultrasonic unit over their full length and full section. The wall thickness of each flat of the drive section is verified ultrasonically. All kellys’ connectons are fitted with pressed steel thread protectors on both ends and each kellys would be shipped with steel scabbard for marine transportation.

Specification for Square Kelly

Nom Size
(in)

Lengths
(ft)

Top Upset Joint

Bottom Upset

Bore

Drive Section

Weight
(kg)

Standard

Optional

LH
Connection

OD C

LH Connection

OD C

RH Connection

OD D

Standard

Optional

(in)

2 1/2

40
46

37
43

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC26
(2 3/8 IF)

3 3/8

1 1/4

3 1/4

2 1/2

410
465

360
420

40
46

37
43

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC31
(2 7/8 IF)

4 1/8

1 3/4

3 7/8

495
560

450
515

3 1/2

404654

37
43
51

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC38
(3 1/2 IF)

4 3/4

2 1/4

4 3/7

3 1/2

600
670
780

555
630
730

4 1/4

404654

37
43
51

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC46(4 IF)orNC50(4 1/2 IF)

6or6 3/8-6 1/2

2 4/5

5 1/2

4 1/4

825
940
1070

780
890
1040

5 1/4

40
46
54

37
43
51

6 5/8 Reg

7 3/4

NC50or
5 1/2 FH orNC56

3 1/4

6 3/4

5 1/4

1250
1430
1670

40
46
54

37
43
51

6 5/8 Reg

7 3/4

6 5/8 FH

3 1/2

7 5/8

1670
1920
2250

Specification for Hex kellys

Nom Size
(in)

Lengths
(ft)

Top Upset Joint

Bottom Upset

Bore

Drive Section

Weight
(kg)

Standard

Optional

LH
Connection

OD C

LH Connection

OD C

RH Connection

OD D

Standard

Optional

(in)

40
46

37
43

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC26
(2 3/8 IF)

3 3/8

1 1/4

3.375

450
500

400
555

3 1/2

40
46
54

37
43
51

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC31
(2 7/8 IF)

4 1/8

1 3/4

3.937

3 1/2

580
670
780

535
620
730

4 1/4

404654

37
43
51

6 5/8 Reg

7 3/4

4 1/2 Reg

5 3/4

NC38
(3 1/2 IF)

4 3/4

2 1/4

4.781

4 1/4

750
840
980

700
800
940

5 1/4

40
46
54

37
43
51

6 5/8 Reg

7 3/4

NC46(4 IF)orNC50(4 1/2 IF)

6or6 3/8-6 1/2

2 13/16or3 1/4

5.9

5 1/4

1020
1170
1350

40
46
54

37
43
51

6 5/8 Reg

7 3/4

NC50or
5 1/2 FH orNC56

3 1/2

6.812

1320
1500
1770

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