Question: Which Bolts Are The Strongest?

What is the difference between a 10.9 and 12.9 Bolt?

12.9 grade steel has 120% of the tensile strength of 10.9 grade steel.

The “12” prefix indicates a tensile strength of X100 N/mm^2 and the “9” suffix indicates a multiplier.

Both 12.9 and 10.9 have the same multiplier, so the comparison is straightforward: 12 to 10..

Are Grade 8 bolts brittle?

A Grade 8 has a very high tensile strength, but can be brittle. In applications such as suspensions, a very high number of load/unload cycles can produce work hardening, which produces an immediate, or catastrophic failure.

Are stainless steel bolts stronger than Grade 8?

Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.

Is a 10.9 Bolt stronger than Grade 8?

A tempered medium carbon steel. Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8.

Is a 12.9 Bolt stronger than Grade 8?

Property class (often just “class”) specifies metric fasteners. Special markings on screw heads and nuts identify the fastener’s grade….Table 1.Grade/ClassStrengthMetric Class 8.8Similar to Grade 5.Metric Class 10.9Similar to Grade 8.Metric Class 12.9The highest metric class for strength, it exceeds Grade 8.11 more rows

What grade are Home Depot bolts?

It’s virtually identical in terms of chemical and physical strengths and properties as an SAE Grade 5 bolt. No matter the types of bolts you need for your home or mechanical project, The Home Depot has the bolts, washers and nuts you need for a secure fit.

Is 304 or 316 stainless better?

The most basic difference between grade 304 and grade 316 stainless steels is that 316 tends to have more nickel and a bit of molybdenum in the mix. … Though the stainless steel 304 alloy has a higher melting point, grade 316 has a better resistance to chemicals and chlorides (like salt) than grade 304 stainless steel.

What grade of bolt is stronger?

The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.

What is the difference between 8.8 and 12.9 grade bolts?

The mechanical difference between the 12.9 and 8.8 is yield strength (roughly 90% of 1200 MPa vs 80% of 800 MPa). That means the 12.9 can be stretched further (i.e. torqued to some higher value) before it yields, which of course increases the clamp force.

What grade is a 12.9 bolt?

The 12.9 is the Class head marking under ASTM F568M standard for Bolts of a high grade (1220 MPa), being Alloy steel, quenched and tempered. ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications.

What is the strongest metal for bolts?

The world’s strongest bolts are stainlessBUMAX® Ultra – the world’s strongest bolt. … Nobel Prize winning technology. … Demanding applications. … Replacing carbon steel fasteners in critical applications.

What is the strongest stainless steel bolt?

BUMAXBUMAX IS BUFAB’S REGISTERED TRADEMARK, KNOWN AS THE STRONGEST STAINLESS STEEL FASTENER IN THE WORLD. BUMAX IS MANUFACTURED IN BUFAB’S OWN PLANTS IN SWEDEN AND MEETS THE REQUIREMENTS OF HIGH DEMANDING CUSTOMERS.

What grade of stainless steel is best?

Austenitic stainless steels generally provide the most corrosion resistance because of their high amounts of chromium. This makes grade 304 an excellent choice when corrosion resistance is important.

What is the difference between Grade 5 and Grade 8 bolts?

Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head.

What grade bolt has the highest shear strength?

12.9 Bolt Shear Capacity12.9 Bolts. A 12.9 bolt is one of the highest grade of bolts produced. Known for their high tensile strength, they are built with both hex and Torx heads and are available in zinc or chrome finishes. … 12.9 Shear Strength. The minimum tensile strength of a 12.9 bolt is 1220 MPa.