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Square Kelly hexagonal kelly API standard for well drilling

Country/Region china
Company Xi'an ZZ Top Oil Tools Co.,Ltd
Categories Other APIS
Telephone 86-29-81779342
ICP License Issued by the Chinese Ministry
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Square Kelly hexagonal kelly API standard for well drilling

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Square Kelly hexagonal kelly API standard for well drilling
Model No:Top-Square kelly-001
Place of Origin:Shaanxi,China (Mainland)
Size:2 1/2"-5 1/4"
Use:Well Drilling
Brand:ZZ Top
Processing Type:Forging
Package:Shipping scabboard
Working space:37ft

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Product Description

Payment & Shipping TermsSupply Capacity
Unit Price:500.0~5000.0 USDProduction Capacity:10pcs/month
Trade Term:FOBPacking:Scabboard
Payment Term:L/C, T/TDelivery Date:15days
MOQ:1 Piece/Pieces
Means of Transport:Land, Ocean, Air

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.

Category: Kelly

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