With a fully threaded design

and outdoor construction

3/4-10 x 2 1/4 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (25)

1 1/2-6 x 7 A307A Hex Bolt Plain Steel

Note - there is no single standard for coupling nut dimensions

#10-32 x 5/8 Socket Head Cap Screws Thermal Black Oxide Alloy Steel Domestic USA - Bulk (5000) M20-2.50 Hex Cap Screws DIN 933 18-8 Stainless Steel (A2) With a fully threaded design#10 32 x 5 8 Socket Head Cap Screws Thermal Black Oxide Alloy Steel Domestic USA Bulk (5000) Socket Cap Screws with Thermal Black Oxide finish are made in the USA from durable alloy steel for superior strength and reliability. Featuring a hex drive and corrosion resistant coating, ideal for high performance and structural applications.