Galvanized drop machine bolts (or square head bolts) can be used in both marine and treated wood applications due to the heavy galvanization applied to the bolts. Machine bolts can be used for many of the same applications as Timber bolts but require the need for a washer on the bolt head end as well as the nut end..
Machine Bolt Sizes
We carry machine bolts (square head bolts) in both 5/8" and 3/4" diameters with lengths starting at 6" all the way up to 36" in length. No matter your application we have the timber bolt size for you. We also carry a full collection of square washers, square curved washers, round washers and coil lock washers.
| SC8806 | Bolt, square head machine, 5/8" x 6" w/ square nut - HDG | $1.10 |
| SC8808 | Bolt, square head machine, 5/8" x 8" w/ square nut - HDG | $1.15 |
| SC8810 | Bolt, square head machine, 5/8" x 10" w/ square nut - HDG | $1.25 |
| SC8812 | Bolt, square head machine, 5/8" x 12" w/ square nut - HDG | $1.45 |
| SC8814 | Bolt, square head machine, 5/8" x 14" w/ square nut - HDG | $1.60 |
| SC8816 | Bolt, square head machine, 5/8" x 16" w/ square nut - HDG | $1.70 |
| SC8818 | Bolt, square head machine, 5/8" x 18" w/ square nut - HDG | $2.05 |
| SC8820 | Bolt, square head machine, 5/8" x 20" w/ square nut - HDG | $2.15 |
| SC8822 | Bolt, square head machine, 5/8" x 22" w/ square nut - HDG | $2.35 |
| SC8824 | Bolt, square head machine, 5/8" x 24" w/ square nut - HDG | $2.75 |
| SC8826 | Bolt, square head machine, 5/8" x 26" w/ square nut - HDG | $3.00 |
| BS8908 | Bolt, square head machine, 3/4" x 8" w/ square nut - HDG | $1.75 |
| SC8910-NN | Bolt, square head machine, 3/4" x 10" NO nut - HDG | $2.00 |
| SC8910 | Bolt, square head machine, 3/4" x 10" w/ square nut - HDG | $2.25 |
| SC8912 | Bolt, square head machine, 3/4" x 12" w/ square nut - HDG | $2.70 |
| SC8914 | Bolt, square head machine, 3/4" x 14" w/ square nut - HDG | $3.00 |
| SC8916 | Bolt, square head machine, 3/4" x 16" w/ square nut - HDG | $3.15 |
| SC8918 | Bolt, square head machine, 3/4" x 18" w/ square nut - HDG | $3.70 |
| SC8920 | Bolt, square head machine, 3/4" x 20" w/ square nut - HDG | $4.00 |
| SC8922 | Bolt, square head machine, 3/4" x 22" w/ square nut - HDG | $4.50 |
| SC8924 | Bolt, square head machine, 3/4" x 24" w/ square nut - HDG | $4.75 |
Washers
 H.D. Galvanized Square and Curved Square Washers |
 H.D. Galvanized Lock Washers |
 H.D. Galvanized Dock Washers |
 H.D. Galvanized Ogee Washers |
| SC6821 | Washer, curved square, 2-1/4" x 3/16", for 5/8" bolt - HDG | $0.35 |
| SC6829 | Washer, curved square, 4" x 4" x 1/4", for 7/8" bolt - HDG | $1.00 |
| SC1074 | Washer, flat square, 2" x 1/8" for 5/8" bolt - HDG | $0.25 |
| WSFG8902 | Washer, flat square, 2" x 3/16" for 3/4" bolt - HDG | $0.30 |
| SC1076 | Washer, flat square, 2-1/4" x 3/16" for 3/4" bolt - HDG | $0.40 |
| SC1075 | Washer, flat square, 2-1/4" x 3/16" for 5/8" bolt - HDG | $0.40 |
| SC1079 | Washer, flat square, 3" x 1/4" for 3/4" bolt - HDG | $0.75 |
| SC1078 | Washer, flat square, 3" x 3/16" for 3/4" bolt - HDG | $0.80 |
| SC1080 | Washer, flat square, 4" x 3/16" for 3/4" bolt - HDG | $0.90 |
| SC139 | Washer, lock, 5/8" - HDG | $0.19 |
| WDG88 | Washer, NY dock, 3'' x 1/4" for 5/8" bolt - HDG | $0.70 |
| WDG89 | Washer, NY dock, 3'' x 1/4" for 3/4" bolt - HDG | $0.75 |
| WDG91 | Washer, NY dock, 3-1/4" x 1/4" for 1" bolt - HDG | $0.85 |
| WDG91 | Washer, NY dock, 3-1/4" x 1/4" for 1" bolt - HDG | $0.85 |
| WDG93 | Washer, NY dock, 3-1/4" x 1/4" for 1-1/4" bolt - HDG | $0.85 |
| WOGG88 | Washer, ogee for 5/8" bolt - HDG | $0.70 |
| WOGG89 | Washer, ogee for 3/4" bolt - HDG | $0.90 |
| WOGG91 | Washer, ogee for 1" bolt - HDG | $1.60 |
| WRGT8802.5 | Washer, round, 2-1/2'' x 1/4'' for 5/8'' bolt - HDG | $0.50 |
| WRG8902.5 | Washer, round, 2-1/2" x 1/8" for 3/4" bolt - HDG | $0.40 |
| WRG8802.5 | Washer, round, 2-1/2" x 1/8" for 5/8" bolt - HDG | $0.45 |
| WRG9103 | Washer, round, 3" x 3/16" for 1" bolt - HDG | $0.50 |
