The reason for wanting to run the shackle with the straps on the pin comes from the fact that the stresses on the nylon straps are "better" (for lack of words) when the strap rides on the pin as opposed to the straps being bent by the radius of a typical bow shackle. This does not come into play unless you are approaching the SWL of the strap, then it becomes a concern. If I recall correctly from being involved in moving 100+ ton rolls in papermills using essentially the same straps we use for recovery offroad, we **should** be OK unless we are going above 80% of the SWL or WLL. This is why folks like Dixon-Bates make special shackles that are flat for utilizing straps .....
MUD WORKS!! Thanks Sam/Ben!!
I figured Mr. Burke had a reason.
I thinks we will be ok for now, as I plan to stay well under 80% of SWL, WLL, SWF, WTH, WTF, GFTOH, ETC.
Luckily, Crosby makes them in red...
From Crosby product description:
• All Alloy Construction.
• Design Factor of 5 to 1.
• Each shackle has a Product Identification Code (PIC) for material traceability along with a Working Load Limit and the name Crosby forged into it.
• Incorporates same ear spread and pin dimensions as conventional Crosby Shackles. Allows easy connection to pad eyes, eye bolts, and lifting lugs.
• Increased radius of bow gives wider sling bearing surface resulting in an increased area for load distribution, thus:• Increasing Synthetic Sling efficiency as compared to standard anchor and chain shackle bows and conventional eye hooks. This allows 100% of the slings rated Working Load Limit to be achieved.
• Allows better load distribution on internal fibers.
• Meets or exceeds all requirements of ASME B30 26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these shaackles meet other critical performance requirements including fatigue life, impact properties and material traceability, not addressed by ASME B30 26.
