Similarly, grade 12.9, heremon in metric circles, has as its only ASTM mechanical equivalent , A574. A574, however, is a socket head cap screw standard, so studs and hex bolts are left out and do not have a direct equivalent . Metric bolt conversion data for industrial bolts /rods, machine screws and small diameter fasteners from Elgin Fastener Group includes metric to standard bolt conversions. The chart below shows metric bolt conversions and DIN numbers for fasteners. SAE vs. Metric bolt strength. No need to hereplicated.if you do the proper resarch you will find these approximate equivalents : US Grade 2 = approx metric property class 5. 8 US Grade 5 = approx metric property class 8 . 8 US Grade 8 = approx metric property class 10.9

Understanding Fastener Grades and Classes. Strength is similar to Grade 8 . Use with ASTM A325 structural bolts . Grade 2: Low strength. Grade 2H Nuts: . Metric Class 8 . 8 : Similar to Grade 5. Metric Class 10.9: Similar to Grade 8 . Metric Class 12.9: The highest metric class for strength, it exceeds Grade 8 . english/ metric bolt substitution table equivalent metric bolt substitution – astm grade bolt sizes f - 568 class 4.6 f - 568 class 8 . 8 f - 588 class 8 . 8 .3 f - 568 class 9. 8 f - 568 class 10.9 a - 325m type 1 or 2 a - 325m type metric english 3 (mm) (inches) hole diam (mm) english - astm grade specified a - 449 type 1 a - 354 grade bd U- Bolt -It supplies high quality metric bolts to all industries, including metric grade 8 . 8 bolts . We stock a full line of metric 8 . 8 bolts , and work with the top manufacturers in the industry to provide the highest quality bolts for our clients.

Steel Bolts - Metric Grades Steel Bolts - SAE Grades For metric bolts strength is according ISO 898 Mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with designations 4.6, 4. 8 , 5. 8 , 8 . 8 , 9. 8 , 10.9 and 12.9. 19 rows Unit Conversion ; Tap and Drill Sizes; Other Useful Information; Bolt Grade Markings and …