Seller: stlhardware (4,050) 99.9%, Location: Saint Louis, Missouri, Ships to: US & many other countries, Item: 391638794215 Qty. 9 - vintage square head machine bolts 3/4-10 x 1 3/4" - plain steel finish - thread length is 1 3/4" - the head is approximately 1 1/8" square and 7/16" thick - some surface rust on the threads and head - the machine bolts will come packaged in a zip lock bag . I do not know the grade as these are unmarked. New old stock from an oldtime hardware store. St. Louis Screw & Bolt Co. Made in the USA Condition: New old stock - some surface rust on the threads and head - need cleaned - will come in a zip lock baggie - these are not marked so I do not know the grade, Brand: St. Louis Screw & Bolt, MPN: Does not apply, Fastener Type: Machine Bolt, Drive Type: Wrench, Head Style: Square, Coating: Plain, Grade: unknown, Material: Steel, Thread Diameter (in.): 3/4-10, Length (in.): 1 3/4", Model: Square Head Machine Bolt, Quantity: 9, Country/Region of Manufacture: United States, Thread Length: 1 3/4"