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China Square Kelly hexagonal kelly API standard for well drilling manufacturer


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Square Kelly hexagonal kelly API standard for well drilling 

Price: 500.0~5000.0 USD 
Payment Terms: T/T,L/C 
Place of Origin: Shaanxi, China (Mainland) 
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Product Detail

Model No.: Top-Square kelly-01
Production Capacity: 10pcs/month
Delivery Date: 15 days
Use: Well Drilling
Material: AISI4145H
Processing Type: Forging
Length: 40ft
Means of Transport: Ocean,Land,Air
Packing: Scabboard
Size: 2 1/2"-5 1/4"
Brand: ZZ Top
Standard: API
Package: Shipping scabboard
Working space: 37ft

square kelly and Hexagonal Kellys are the drive section of the whole drill stem 3.2-1/2", 3", 3-1/2", 4-1/4", 5-1/4" 40ft,scabboard package

Standard Square Kelly is made from AISI 4145H alloy steel according to API Spec7-1. We can offer Square Kelly and Hexagonal Kelly. Kelly's ends drive cross-section and joint are all processed and tested in terms of API Spec7-1.

 It is formed through hot forging and fully heat-treated by intermediate frequency induction heat treatment or 20m horizontal optical resistance furnace. Threads can be phosphated, copperized or cold worked. 


1.  We can manufacture square kelly and hexagonal kelly as per requirements of customers.

2.  They are made of AISI 4142H-4145H forged or rolled alloy structural steel. Quenching plus tempering thermal treatment will be conducted over the whole length. Its Brinell hardness can reach 285-341 on the basis of such thermal treatment. Charpy impact energy: 54J. The formulated process can ensure that the misalignment of the hole reaches the standard wall thickness.


Upper box connectionLower pin connectionI.D.Driving section
mminType(LH)O.D.ThreadO.D.Cross flatFor square kellyCross corner for hexa kelly
63.52 1/212.196 5/8REG4 1/2REG196.8146.0NC2685.731.863.583.3
76.2312.196 5/8REG4 1/2REG196.8146.0NC31104.844.476.2100.085.7
88.93 1/212.196 5/8REG4 1/2REG196.8146.0NC38120.657.288.9115.1100.8
108.04 1/412.96 5/8REG4 1/2REG196.8146.0NC46158.871.4108.0141.3122.2
6 5/8REG4 1/2REG196.8146.0NC50161.971.4108.0141.3122.2
133.45 1/412.96 5/8REG196.85 1/2FH177.882.6133.3175.4151.6
6 5/8REG196.8NC56177.882.6133.3175.4151.6

Process procedure



When ordering Please specify:

1. Kelly type (square or hexagonal);

2. Nominal size and overall length;

3.Upper and lower Connections.

Ms. Elaine
skype Ms. Elaine

Tel: 86-29-81779342
Mobile: 136 2920 7466
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Company Info

XI'AN ZZ TOP OIL TOOLS CO.,LTD [China (Mainland)]

Business Type:Manufacturer, Distributor/Wholesaler, Service
City: Xi'an
Province/State: Shaanxi
Country/Region: China (Mainland)

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