16 EACH BOLT_STUD, NOMINAL DIAMETER: 1-5/8 IN, THREAD TYPE: 8UNC, LENGTH: 345 MM, STUD MATERIAL: ASTM A320 GR.L7M, NUT MATERIAL: ASTM A194 GR.7M, NO.OF NUTS: 2 (HEAVY HEXAGONAL NUTS), DIMENSION STANDARD: ASME B18.2.1/2.2, THREAD STANDARD: ASME B1.1 2A/2B, MATERIAL TEST CERTIFICATE: EN 10204-3.1, MANUFACTURER: STUDBOLT MANUFACTURING, ADDITIONAL FEATURES: TEST REQUIREMENTS: IMPACT TESTING AS PER ASTM A320 LINE CLASS: 6R3BS PIPING SYMBOL: P29F09-004.