Square Kelly hexagonal kelly API standard for well drilling

Price: 500.0~5000.0 USD
Trade Term: FOB
Payment Terms: T/T,L/C
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Basic Info.
  • Size: 2 1/2"-5 1/4" 
  • Use: Well Drilling 
  • Brand: ZZ Top 
  • Material: AISI4145H 
  • Standard: API 
  • Processing Type: Forging 
  • Package: Shipping scabboard 
  • Length: 40ft 
  • Working space: 37ft 
  • Model No.: Top-Square kelly-001 
  • Place of Origin: Shaanxi  
  • Min.Order: 1 Piece/Pieces
  • Means of Transport: Ocean, Air, Land
Supply Capacity
  • Production Capacity: 10pcs/month
  • Packing:Scabboard
  • Delivery Date: 15days

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 5/8REG
5 1/2FH177.882.6133.3175.4151.6
6 5/8REG

Process procedure



When ordering Please specify:

1. Kelly type (square or hexagonal);

2. Nominal size and overall length;

3.Upper and lower Connections.

Send message to this supplier
Ms. Kathy (sales)
Tel: 86-29-81779342
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Contact Method
RM22808,SHANGPIN INTERNATIONAL,NO.88GAOXIN ROAD,HI-TECH ZONE, Xi'an, Shaanxi, China (Mainland) / 710065
Fax: 86-29-81779342
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