VAM API Buttress 2.5 – English Buttress 2.5

Threading inserts – Buttress

Threading buttress – The buttress thread form, also called the breech-lock thread form, refers to two different thread profiles. The first one is a type of leadscrew and the second one is a type of hydraulic sealing thread form. The leadscrew type finds application in machinery while the sealing type is often used in oil fields. The asymmetric thread form allows the thread to have less friction. It also withstands greater loads than other forms in one direction.

Buttress thread in machinery

Buttress threads finds use in the construction of artillery, particularly with the screw-type breechblock. It generates minimal disengagement force when tightened in the normally loaded direction.

Buttress thread in oil field tubing

In oil field tubing, buttress thread is designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread. High torque and longitudinal force is transmitted almost parallel to the axis. The thread is about the same strength as standard v threads.

VAM – API BUTTRESS 2.5

Threading buttress - VAM - API BUTTRESS 2.5

Threading inserts - VAM - API BUTTRESS 2.5Threading inserts - VAM - API BUTTRESS 2.5
Helix
Part No.
Dimensions in mm
Tool holder
Anvil
TPI
right-hand
B
l
d
t
l3
External
5
22ER 5BUT2.5

2.59

22

12.70
2.5
2.2

CER/L 22

NX 22-0
Internal
5
22NR 5BUT2.5
2.63

22

12.70
2.1
2.0
CNR/L 22

NX 22-0

Threading buttress - ENGLISH BUTTRESS 2.5

ENGLISH BUTTRESS 2.5

Helix
Part No.
Dimensions in mm
Tool holder
Anvil
mm
right-hand
l
d
t
l3
External
2.5
22ER 2.5 Butt

22

12.70

3.0
2.0

CER/L 22

NX 22-0
Internal
2.5
22NR 2.5 Butt

22

12.70

2.5
2.4

CNR/L 22

NX 22-0
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