Durable galvanized connector pins with included hitch clip, available in multiple sizes. Hitch clips and flat washers also sold separately.

F-PIN34: For Residential and Standard hardware. 
(3/4" x 4" HDG Pin and Clip)

F-PIN36: For Heavy Duty hardware. 
(3/4" x 6" HDG Pin and Clip)

Separate Hitch Clip: F-HC16 HDG.