Apr 10, 2021 · Let’s walk through how to decipher metric bolt and screw grades, plus their head markings, using one ISO standard and its following property classes as examples: ISO 898-1 Property Class 8.8 Metric Bolt and Screw Head Marking

These charts helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength bolts.

Metric steel bolts, screws and studs - proof and tensile strength.

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Yield Strength: The maximum load at which a material exhibits a specific permanent deformation. Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.

Apr 10, 2021 · Screw and bolt head markings identify the manufacturer of the fastener and the standard to which the fastener was made. Below, we’ll explore both of those concepts, then connect them together with a few examples.

Nov 5, 2019 · Printable Chart for easy comparison between Metric Bolt Classes and US grades equivalents. Most common stainless. Similar to 304 / 18-8. Chart for easy comparison of US / Metric screws and bolts. It is always a bit unusual to compare them as they use different measurement systems (PSI vs. Mpa).

Feb 15, 2019 · Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face. The below diagram shows examples of English and …

Jun 9, 2022 · Metric markings combine two numbers separated by a dot. The number markings are engraved on the top or side of the bolt head. Common metric classes are 5.8, 8.8, 10.9, and 12.9. The higher the numbers are, the stronger the material of the fastener is.

Metric socket head cap screws are offered in more than one strength level (unlike inch sizes that only come in one strength level). Metric socket heads are most commonly stocked in the Property Class 12.9 strength level and require a manufacturer’s marking.

Bolt Grades and Head Markings (Inch & Metric) Bolt Grades and Head Markings – US Inch and Metric Visit our online store for product availability Identification Grade Mark Specification Description Material Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) SAE J429 Grade 5 ASTM A449 Bolts, Screws,Studs Medium Carbon Steel