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Bolt specification for metric bolt is Grade 10
Sizes 7/16 inch and above are hot dip galvanized
and 150 metric ton shackles are all hot dip galvanized bows and the bolts are Dimetcoted and painted red) Sizes 3/8 and below are mechanically galvanized
Charges for proof testing and certification available when requested at the time of order
3-1/4" A-342 Alloy Master Link A-336 Bolt specification for metric boltAlloy Steel Quenched and Tempered. Individually Proof Tested to values shown, with certification. Proof Tested with special fixtures sized to prevent localized point loading. See foot notes, and reference page 276. Forgings have a Product Identification Code (PIC) for material traceability, along with the size, the name Crosby and USA in raised lettering. Selected sizes designated with W in the size column have enlarged inside dimensions to allow