Master Link, Sub-Assemblies and Hardware size requirements when fabricating directly into links, rings, and other hardware

Here are a couple of pointers for anyone who needs to quote or design a synthetic bridle sling. The most important aspect is to select the proper hardware size to meet the sling capacity. Other than the obvious criteria of hardware CAPACITY you have to take into consideration the hardware STOCK diameter.

  1. All Uni-Web® slings can be used with any hardware stock diameter of at least 3/8” diameter. YOU decide on matching capacities as customers sometimes want weird combinations (e.g. a 16,500 lbs sling into an 7,000 lbs master link, rated for that master link).
  2. Uni-Path® Round Slings need hardware minimum stock diameters as indicated in the tables on this page.
    These stock diameters are the one’s listed in the 2010 WSTDA Specification, page 23. If your customer needs to connect to smaller than the listed (round) stock diameters the sling needs to be downrated acc. to WSTDA 4.7.1.1 If your are not familiar with such calculations do NOT attempt to calculate this yourself but ask Unirope.
  3. Note: ASTM B30.9 Chapter 5, 9-5.4 stipulates that “The design factor for web (and round) slings shall be a minimum of 5”. By definition the term “sling” also includes all FITTINGS which are part of a web sling hence, all FITTINGS attached to “web/round slings” MUST also have a Design Factor of 5:1. Therefor, if you use grade 80/100 fittings connected to a web/round sling that fitting MUST have a capacity rating based on a Design Factor of 5:1 instead of 4:1 (as applied to alloy chains).
  4. All Twin-Path® slings made from K-Spec® fibers require hardware sizes which at least matches the sling capacity.
       
WSTDA rated UNI-Path® DF 5:1
Stock No.		 WSTDA Size / # Colour Code lbs Vertical UR Legacy rated UNI-Path® DF 5:1
Stock No.		 Colour Code lbs Vertical Minimum required stock diameter according to WSTDA inch
UPD 26 1 Purple 2,600 UPD 300 Purple 3,000 7/16
UPD 40 — Black 4,000 UPD 400 Black 4,000 1/2
UPD 53 2 Green 5,300 UPD 600 Green 6,000 5/8
UPD 84 3 Yellow 8,400 UPD 900 Yellow 9,000 3/4
UPD 106 4 Tan 10,600 UPD 1200 Tan 12,000 7/8
UPD 132 5 Red 13,200 UPD 1400 Red 14,000 1
UPD 168 6 White 1 16,800 UPD 1700 Orange 17,000 1-1/8
UPD 212 7 Blue 21,200 UPD 2300 Blue 23,000 1-3/16
UPD 250 8 Orange 25,000 UPD 2600 Orange 26,000 1-1/4
UPD 310 9 Orange 2 31,000 UPD 3200 Gray 32,000 1-1/2
UPD 400 10 Orange 40,000 UPD 4000 Orange 40,000 1-5/8
UPD 530 11 Orange 53,000 UPD 5000 Orange 50,000 2
UPD 660 12 Orange 66,000 UPD 6000 Orange 60,000 2-1/8
UPD 7000 Orange 70,000 2-3/8
UPD 800 — Orange 80,000 UPD 8000 Orange 80,000 2-3/8
UPD 900 13 Orange 90,000 UPD 9000 Orange 90,000 2-1/2
UPD 10000 Orange 100,000 2-3/4
1) White or Orange
2) Orange or Grey – depending on availability at time of order.