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 and fasteners 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. Many use the term grade 8 bolts and grade 8 hex cap screws interchangeably, but their is a big difference… tolerance. Grade 8 hex cap screws are made to a much higher precision than grade 8 bolts . Grade 8 bolts are designated as a 150 ksi.

15 rows Inch fasteners —heremonly used in North America—will have a grade or ASTM rating. … 4 SAE J429 Grade 8 , ASTM A354 Grade BD, ASTM A490, ASTM A193 B7 heremon examples of alloy steel fasteners . Stainless Steel Stainless steel is a family of iron-based alloys that must contain at least 10.5% chromium. TorqBolt Inc. is india’s leading Astm F568 Grade 8.8 Fasteners Suppliers, bolts stockist, bolts suppliers, bolts exporters and importer , bolts dealers, stockholders, indentor, bolts manufacturers, retailers, wholesaler, bolts distributors, traders, specialized in delivering consignments on time by means of Express Courier Services DHL,