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. 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. The SAE marking standard starts with grade 2, indicated by a bolt head with no markings whatsoever. A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less. Tensile strength is the amount of pull the bolt can withstand before breaking.

bolts: metric standards. Standards for metric bolts are promulgated by the ISO, . The number before the first decimal point is approximately one-hundredth of the nominal minimum tensile strength of the bolt in newtons per square millimeter (or megapascals, which is the same thing). Jul 27, 2015 I heremend grade 5 when someone asks me about using a grade 8 bolt. I didn't know there was a grade 8+. Yes, the question was why do the metric ratings go higher on the chart. 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) Min. Yield Strength . Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties ; Proof Load

Each metric standard is product specific. For example DIN 931 is for partially threaded coarse thread . 10.9 structural bolt. Metric Thread The metric screw thread is identified by the capital letter M, followed by the nominal diameter. Metric . tolerance grade . Capital letters indicate internal thread (nut) tolerance. Your shopping cart is empty. Subtotal: $0.00 Quick Add Cart / Checkout: Quick Add 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.

A 1/2 - 24 UNF bolt is an American standard bolt 1/2-inch in nominal diameter, 24 threads per inch, with a united national fine thread. For both metric and standard bolts, the head size is the distance across the flats. For standard bolts, the head size is measured in inches or fractions of an inch.