Country/Region china
Company Torlins Oil-Gas Equipment & Technologies Co., Ltd
Categories Drilling String
Telephone 01057458586
ICP License Issued by the Chinese Ministry
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FZ series Kelly are used to connect the topmost joint of drill pipe for drill stem turning when the rotary table runs. Suitable for onshore and offshore drilling.


The FZ series kelly were developed to provide the market with more reliable technology and more hoisting performance. Used to connect the topmost joint of drill pipe for drill stem turning when the rotary table runs. Both square kelly and hexagonal kelly available. Included but not limited by the advantages mentioned, FZ series kelly might be your best choice.

General Features

Manufactured according to API 7K
Suitable for onshore or offshore rigs
Suitable for cold area and desert environment

Main Paramaters

Size: 2-1/26” (63.5 mm 152.4 mm)


Square Kelly

Kelly SizeUpper box connection(LH)Lower pin connection(RH)Driving section lengthOverall Length
inmmThreadO.D. mm ±0.8B.D. mm ±0.4Upper upset length mmThreadO.D. mm ±0.8ID. mmB.D. mm ±0.4Lower upset length mmmmmm
2.1/263.5Standard6 5/8 REG196.8186.1406.4NC2685.731.8835081128012190
2.1/263.5optional4 1/2 REG146134.5406.4NC2685.731.8835081128012190
376.2Standard6 5/8 REG196.8186.1406.4NC31104.844.4100.45081128012190
376.2optional4 1/2 REG146134.5406.4NC31104.844.4100.45081128012190
3.1/288.9Standard6 5/8 REG196.8186.1406.4NC38120.657.2116.35081128012190
3.1/288.9optional4 1/2 REG146134.5406.4NC38120.657.2116.35081128012190
4.1/4108Standard6 5/8 REG196.8186.1406.4NC46158.871.4145.25081128012190
4.1/4108Standard6 5/8 REG196.8186.1406.4NC50161.971.41545081128012190
4.1/4108optional6 5/8 REG196.8186.1406.4NC46158.871.4145.25081554016460
4.1/4108optional6 5/8 REG196.8186.1406.4NC50161.971.41545081554016460
4.1/4108optional4 1/2 REG146134.5406.4NC46158.871.4145.25081128012190
4.1/4108optional4 1/2 REG146134.5406.4NC50161.971.41545081128012190
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