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Kelly bar

Product No.：16
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KELLY BAR

Kelly bars are key components in the execution of boreholes by hydraulic rotary

drilling rigs. They transfer the torque of the rotary drive and the crowd pressure of the

crowd system concurrently to the drilling tool. A kelly bar consists of 2 – 5 telescopic

tubular sections with a system of drive keys and lock recesses, welded onto their

outer surfaces. Standard kelly bars are fabricated with a total of 6 drive keys on each

section. The tubular kelly sections are manufactured from high-tensile seamless steel

tube to ensure minimum weight at adequate strength.

Locking system

Standard kelly bars are delivered as fully lockable system with a mechanical locking mechanism

between each element and between outer bar and rotary drive, 4-element kelly bars can be supplied as non-lockable friction kellies as option.

Our Kelly bars can be suitable for variety of hydraulic rotary drilling rigs such as BAUER, IMT , SOILMEC etc., the high quality steels and components together with quality system ISO 9001 make our Kelly bars have the highest reliability.

Main features of Kelly bars:

● 2 to 6 elements telescopic Kelly bars for Piling

● The depth range is from 10m to 110m

● Torque transfers capacity from 80kNm to 500kNm

● Interlocking Kelly bar

● Friction Kelly bar

● High quality seamless steel pipes

● 6 cams and drive ribs made of special steel materials

● Top flange for connecting Kelly bar to Kelly swivel

● Upper or lower spring shock absorber

● Drive pipe that transfers torque and crowd force to the Kelly bar

● Standard or customized square Kelly box for connecting all types of drilling tools
Plant:

Frictions Kelly bar

Outer Diameter (mm)	Elements	Maximum drilling depth (m)	Retracted length (m)
298	4 or 5	32.50 to 50	7.5 to 11.00
324	4	25.50 to 32.50	8.00 to 9.00
340	4	32 to 56	9.00 to 16.00
355	4 or 5	19 to 55	6.00 to 12.00
368	3 or 4	18 to 52	7.00 to 15.00
377	4 or 5	31 to 60	8.50 to 13.00
394	3 or 4	21 to 64	9.50 to 18.50
406	4 or 5	32 to 77	9.00 to 16.50
419	4 or 5	25.70 to 67.50	7.50 to 14.50
440	3 or 5	18 to 72	7.50 to 15.50
470	4 or 6	32 to 90	9.00 to 19.00
483	4 or 5	37 to 77	10.50 to 16.50
508	4 or 5	32 to 75	9.50 to 16.00

Mechanical interlocking Kelly bar

Outer Diameter (mm)	Elements	Maximum drilling depth (m)	Retracted length (m)
254	2 or 3	10 to 30	6.45 to 11.45
292	2 or 3	15 to 42	9.35 to 18.20
298	3	15 to 33	7.35 to 13.35
305	3 or 4	12 to 36	5.75 to 10.50
343	3 or 4	15 to 48	7.30 to 14.15
355	4	18 to 43	6.00 to 13.00
368	3 or 4	18 to 52	8.40 to 15.40
377	4	40 to 48	11.00 to 15.00
394	3 or 4	21 to 64	9.70 to 18.70
406	4	29 to 62	8.50 to 16.50
419	3 or 4	24 to 68	10.70 to 19.70
440	2 or 4	18 to 65	13.00 to 15.00
470	3 or 4	24 to 64	10.70 to 19.25
483	4	31 to 67	10.50 to 16.50
508	4	25 to 53	7.50 to 14.50
559	3 ro 4	30 to 72	13.75 to 21.75