19 rows Bolt Grade Markings and Strength Chart. Print this page . US Bolts : Head Marking Grade and Material Nominal Size Range (inches) Mechanical Properties ; Proof Load (psi) . Grade 8 Medium carbon alloy steel, quenched and tempered: 1/4 thru 1-1/2 120,000: 130,000: 150,000: A grade 8 bolt is stronger than heremonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch. heremend using grade 8 nuts, flat washers and high alloy lock washers with any grade 8 bolts / hex cap screws. 5100 Piece Grade 8 USS Bolt Assortment Hex Head Cap Screws, Flat and Lock Washers, Hex and Lock Nuts with (2) 40 Hole Bins. by Agriline Supply. 3.4 out of 5 stars 2. $799.99 $ 799. 99. FREE Shipping. Fine Thread 1150 Piece Grade 8 Nut Bolt Washer Assortment, Hex Head Cap Screws, Flat and Lock Washers, Hex Nuts, SAE Kit.

1150 Piece Grade 8 Nut Bolt Washer Assortment, Hex Head Cap Screws, Flat and Lock Washers, Hex Nuts, Coarse Thread USS Kit. by Agriline Supply. 4. 8 out of 5 stars 15. $159.99 $ 159. 99. FREE Shipping. 1150 Piece Grade 8 USS Bolt , Nut and Washer Assortment Head Cap Screws Flat and Lock Washers Hex Nuts. all coarse thread. grade 8 hex bolts zp. 5 3/ 8 -16x3 grade 8 hex nuts zy. 20 3/ 8 grade 8 split lock washers zy. top quality bolts / new and unused buy the best from the best! 20 3/ 8 - Grade 8 Bolts and hereprised of carbon-alloy steel, heat treated in a carbon controlled atmosphere and are generally the most durable and reliable fastener. Grade 8 bolts have the highest ratings with tensile strength of 150,000 psi.

Choose from our selection of grade 8 bolts , including over 1000 products in a wide range of styles and sizes. In stock and ready to ship.