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Xi'an TianRui Petroleum Machinery Equipment Co., Ltd.
Xi'an TianRui Petroleum Machinery Equipment Co., Ltd. Providing Cost-Effective Solids Control Solutions
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ASTM A370 API Oilfield 4145H Kelly Pipe Drill Spare Parts

Xi'an TianRui Petroleum Machinery Equipment Co., Ltd.
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ASTM A370 API Oilfield 4145H Kelly Pipe Drill Spare Parts

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Brand Name : TR Solids Control

Model Number : TRFZG

Certification : API 7-1, ISO 9001

Place of Origin : Xi'an China

MOQ : 1 pc

Price : Negotiable

Payment Terms : L/C, D/A, D/P, T/T, Western Union

Supply Ability : 100000 pcs Per Month

Delivery Time : 15 days

Packaging Details : Pallet or wooden case

Size : 2-1/2" ~ 6"

Processing Type : Forging

Steel Grade : 4145H

Color : Blue, Black

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Oilfield Drilling Tools Drill Kelly Pipe Hex Kelly / Square Kelly

Product Overview


Kelly is located in the top of the drill string, with square and hexagonal. In rotary drilling, when it is drilling, kelly connected with square bushing and rotary bushing, transfer the ground rotary torque to drill pipe and to drive the drill bit,bearing the weight of the drill string.In the drilling of the turbine and screw, the weight of the drill string and the counter torque are supported.

Square drill kelly are made from AISI 4145H alloy bars that are quenched and tempered full length. A hardness range of 285 to 341 BHM and a minimum impact value of 54 Joules as per ASTM A 370 are maintained one inch bellow the surface at room temperature. To improve resistance to galling, all connections are phosphate-coated with an API thread compond. Each bar used to manufacture kellys has been examined with magnetic partice inspections and ultrsonic inspections.

Package & Shipment
Package: Seaworthy package (or as customer require)
MOQ: 1 Pieces
Delivery: 30 days (can be short if we have stock)
Payment: 30%T/T in advanced+70% balanced;irrevocable L/C at sight
Remarks: All-risk insurance and accept the third party test
Port: Tianjin/Qingdao/Shanghai

Key Specialities of Square & Hexagonal Kelly

  1. Ends and drive section,IDs and connections machined and inspected to API specification.
  2. Shipped in a protective steel -cased scabbard.
  3. Ultrasonic inspection is performed on all section.
  4. Manufactured from AISI4145H-modified, fully heat-treated alloy steel with a Brinell hardness range of 285-341BHN and a minimum average Charpy impact value of 40ft-Ibs.

Technical Parameters of Our Square & Hexagonal Kelly

Kelly size 63.5 76.2 88.9 108 108 133.4 133.4
2 1/2 3 3 1/2 4 1/4 4 1/4 5 1/4 5 1/4
Lengthdrive Section LD Standard 11280 11280 11280 11280 11280 11280 11280
LD optional 15540 15540 15540 15540
Lengthoverall L Standard 12190 12190 12190 12190 12190 12190 12190
L optional 16460 16460 16460 16460
Length Drive Section DFL Across flate 63.5 76.2 88.9 108 108 133.4 133.4
DC Across cornere 83.3 100 115.1 141.3 141.3 175.4 175.4
DCC Across flate 82.55 98.43 122.7 139.7 139.7 171.45 171.45
RC Radlue 7.9 9.5 12.7 12.7 12.7 15.9 15.9
RCC Radlue 41.3 49.2 56.4 69.9 69.9 85.7 85.7
Wall thickness eccentric bore 11.43 11.43 11.43 12.07 12.07 15.88 15.88
Upper box connection Thread size and style LF Standard 6 5/8 REG 6 5/8 REG 6 5/8 REG 6 5/8 REG 6 5/8 REG 6 5/8 REG 6 5/8 REG
Optional 4 1/2 REG 4 1/2 REG 4 1/2 REG 4 1/2 REG 4 1/2 REG
OD Du Standard 196.9 196.9 196.9 196.9 196.9 196.9 196.9
Du Optional 146.1 146.1 146.1 146.1 146.1
Bevel diameter Lu 406.4 406.4 406.4 406.4 406.4 406.4 406.4
DF Standard 186.1 186.1 186.1 186.1 186.1 186.1 186.1
DF Optional 134.5 134.5 134.5 134.5 134.5
Lower pin connection Label NC26 NC31 NC38 NC46 NC50 5 1/2 FH NC56
Outsize diameter 85.7 104.8 120.7 158.8 161.9 177.8 177.8
LL 508 508 508 508 508 508 508
DF Bevel diameter 82.9 100.4 116.3 145.3 154 170.7 171.1
Inside diameter 31.8 44.5 57.2 71.4 71.4 82.6 82.6

ASTM A370 API Oilfield 4145H Kelly Pipe Drill Spare Parts

Our Service

1. We possess a 24 hr response system to provide convenient, fast, and effective pre-sale, during sale and after-sale service.
2. Our promise: Any equipment sold by Dongying Robust at any place in the world, we will provide after-sale service promptly and efficiently. Any equipment component damaged by manufacturing defect or quality problem during the warranty period, Dongying Robust will bear the direct cost of the damaged parts.
3. Warranty period: 18 months from the day that the unit leaves factory or 12 months from the date that the unit is put into use (choose the earliest one which comes to an end as the calculation standard).

Competitive Advantages


1. We offer high quality products at competitive price.
2. Shortest delivery time.
3. Flexible payment terms.
4. Timely after-sale service.
5. Most of our equipment can be replaceable with international brands.
6. Our products have been exported to Argentina, Egypt, US, Australia, Romania, Pakistan, Dubai, Abu Dhabi, Iran, India, Indonesia, Vietnam, Malaysia and many other countries.


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