BoltsLag Bolts Posted on January 21, 2016April 21, 2016 by admin001 21 Jan Lag bolts are made of steel and can be used for decking or to attach wood to concrete and masonry. Standard Specification Lag Bolts: ASTM A307 GRADE A HEX LAG BOLT ASME B18.2.1 1996 IFI-7 Carriage Bolts