Strength of cable terminations - wire rope grips vs swaged

[Orchidius]

Hi there,

My current stays have swaged fittings, but I'd like to change to wire rope grips and thimbles. I know they weaken the stay somewhat, but I'm unsure by how much and wether it is much more than with swaged fittings...

For example:

The stay on it now has an estimated MBL of 100lb and wire rope grips lower the strengths of the stay by 20%, should that mean that I have to get a new stay with a MBL of 120lb to achieve the same strength stay?

[GordMay]

No; you'd need a new stay of 125 Lb (100 ÷ 0.80) to match (in your hypothetical).

[GordMay]

BTW: Your hypothetical (20% strength reduction) seems pretty accurate.

According to LOOS & WESCO:

“The swaged connection will exceed the rated breaking strength of the wire rope or cable when properly applied.”
➥ Rigger's Guide

"CLIPS 80% IF INSTALLED CORRECTLY."
➥ http://www.wescovan.com/catalogs/Wir...rminations.pdf

And according to University-National Oceanographic Laboratory System

“The swaged and helical terminals are rated for 100% of the cable’s rated breaking strength.
Poured sockets, compressed sleeves and mechanical fittings are rated at 95% to 100%,
while wire rope clips and open-wedge terminations are rated at 75% to 85%. Wire rope clips tend to lose their holding strength with use and must be retightened from time-to-time. “
➥ http://www.unols.org/publications/wi...rminations.pdf