En74-1

TG20:13 Design Guide, section 5.9 refers to the Structural properties and design criteria for couplers.
5.15 is a tabulation of working loads for couplers on steel or aluminium.

Right angle 90 class A = 6.1kN in slip
Right angle 90 class B = 9.1kN in slip

Swivel class A = 6.1kN in slip
Swivel class B = 9.1kN in slip

B&P = 6.1kN in slip
 
Alan as an Old GB man what is the slip load of the old SGB MARK A double ?
while im at it what about the DH ?
Knowledge is Power ;)
 
happyhugenoet said:
Alan as an Old GB man what is the slip load of the old SGB MARK A double ?
while im at it what about the DH ?
Knowledge is Power ;)
Click to expand...

The old MK3a was a 1.25Ton/12.5kN fitting (believe you can still buy them new)
The DH was was a Putlog Coupler which was also suited for Brace coupler the fitting had to be capable of restraining 127kgf/1.25kN.
The first thing I did when I arrived at Bow was to sell their entire stock of DH's never been a fan.
 
Why do most people I've worked with including myself always thought a right angle coupler was 6.2 kn ?
 
The double used to be 6.25 kN in BS 5973 but changed to 6.1 kN for EN74 & TG 20.
 
scaface said:
Why do most people I've worked with including myself always thought a right angle coupler was 6.2 kn ?
Click to expand...

As Biffo indicates they were typically 0.625t and are referred to in BS5973 table 17 as a 6.3kN for a type A rightangled coupler and 9.4kN for a type B.
Over and above these was the SGB Mk3a which was 1.25t

The same couplers are now covered in TG20:13 Table 5.15
Type A Coupler 6.1kN
Type B Coupler 9.1kN
Band & Plate 6.1kN
 
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