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API Thread Connections Guide

The document discusses different types of thread connections used in the oil and gas industry, including single shoulder connections like Regular (REG) and Internal Flush (IF), and double shoulder connections like XT and Hi-Torque (HT) that provide increased torque capacity. It also lists common thread sizes at a particular rig with color codes and provides details on API Regular, Internal Flush/Numbered Connection, Hi-Torque, Extreme Torque, and thread identification processes.

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Hadirah Dunglah
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700 views2 pages

API Thread Connections Guide

The document discusses different types of thread connections used in the oil and gas industry, including single shoulder connections like Regular (REG) and Internal Flush (IF), and double shoulder connections like XT and Hi-Torque (HT) that provide increased torque capacity. It also lists common thread sizes at a particular rig with color codes and provides details on API Regular, Internal Flush/Numbered Connection, Hi-Torque, Extreme Torque, and thread identification processes.

Uploaded by

Hadirah Dunglah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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THREAD CONNECTIONS

API (AMERICAN PETROLEUM INSTITUTE) PREMIUM


Single shoulder connections: they only have one Double shoulder connections: they have an extra
torque shoulder on both pin and box. Examples: torque shoulder in the nose of the pin and in the
REG (Regular) bottom of the box. This provides a bigger shoulder
IF (Internal Flush) area, thus allowing a higher makeup torque.
NC (Number Connection) Examples:
FH (Full Hole) XT (Grant Prideco)
DSTJ (Tenaris)
Vam Eis (Vam)
MT (DP Master)

COMMON THREADS AT T-203 RIG WITH COLOUR CODES


3 IF / NC38
4 IF
4 IF / NC50
XT39
HT55
4 REG
6 5/8 REG
7 5/8 REG

DIFFERENT TYPES OF THREAD CONNECTIONS


Thread form: V-0.050
First generation double-shouldered
connection providing approximately 40%
more torque capacity than API connections of
equivalent dimensions
Not interchangeable with API connections
Secondary internal shoulder on nose of pin
Primary external shoulder
Has an extended pin base, pin nose, box
counterbore
HI-TORQUE CONNECTION (HT)

Thread form: V-0.042R


EXTREME TORQUE CONNECTION (XT)
Second generation double-shouldered
connection providing approximately 65%
more torque capacity than API connections
of equivalent dimensions
Not interchangeable with API connections
Primary differences exist between HT and
XT connections are XT has a shallow taper
and a fatigue-resistant thread form
API REGULAR (REG)

Thread form:
V-0.040 (4 REG)
V-0.050 (6 5/8 REG & 7 5/8 REG)
Single rotary shouldered connection
Main purpose: bit connection

Thread form: V-0.065 INTERNAL FLUSH (IF) / NUMBERED


Single rotary shouldered connection CONNECTION (NC)
Thread form: V-0.038R
NC connection No. is the pitch diameter in inches
of the pin thread at the gauge point, expressed
in units of 0.1 in
Interchangeable with IF style having the same
pitch diameter
Only differ in thread form

THREAD IDENTIFICATION PROCESS

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