Fastener Grades API ASTM Fastener Grades Norsok M-630 Fastener Grades BS EN ISO 3506 A2-50, 70, 80 BS EN ISO 3506 A4-50, 70, 80 BS EN ISO 898-1 Grade 8.8, 10.9 & 12.9 Contact our material specification experts to discuss your needs. We look forward to collaborating with you. Contact Us