A. Design structural bolted connections as “slip-critical.” Use ASTM A325, Type 1, high-strength bolts for painted connections, and Type 3 bolts for unpainted weathering steel connections.
B. Do not use ASTM A490 bolts unless approved by the SDO or DSDO.
C. Non-high-strength bolts may conform to ASTM A307.
D. Bolt diameters of 3/4, 7/8, 1, or 1 1/8-inch typically should be used. Larger bolts may be used with prior approval by the Department. One size bolt should be used for all structural connections on any given structure. See the SDM Chapter 14.