Question: What Type Of Steel Is Grade 8?

What kind of steel are Grade 8 bolts made of?

carbon alloy steelStrength Differences A325 bolts are typically manufactured from a medium carbon steel (although they can be made from an alloy) while SAE grade 8 bolts are made from a medium carbon alloy steel..

What is class 8.8 Steel?

Mechanical propertiesGrade, material & conditionNominal thread diameter size range [mm]Tensile strength (min) [MPa]Class 5.8 Low or medium carbon steel; cold worked5–24520Class 8.8 Medium carbon steel; quench and temperedUnder 16 (inc.)80017–72830Class 8.8 low carbon Low carbon boron steel; quench and tempered9 more rows

What is the strongest bolt grade?

grade 8The 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.

Are 18 8 and 304 the same?

’18/8′ is probably the most commonly used stainless steel and contains 18% chromium and 8% nickel. This steel is also known as ‘304’ (in the American AISI grade designation system) or 1.4301 in the European BS EN 10088 standard. … The chromium content is optimistically said to be 18% but is nearer 17%.

What is the hardest bolt you can buy?

BUMAX® Ultra has proven itself as the world’s strongest bolt – in various highly-demanding critical fastener applications around the world where standard fasteners are simply inadequate.

What grade is a Class 8 nut?

Class 8. This is a metric nut grading similar to the SAE grade 5 classification, which is used in conjunction with Class 8.8 bolts. This is a medium strength nut.

What does 12.9 mean on a bolt?

The minimum ultimate tensile strength of the Grade 12.9 Metric Hex Head Bolts is about 1242 Mpa or 180,000 PSI, making them the highest grade of bolts produced.In fact, the Grade 12.9 Nuts is known for their high tensile strength.

What is a Class 8 bolt?

They have a tensile strength of 120,000 PSI. Grade 8 bolts are a heat treated alloy steel that are hardened more than the Grade 5. Thus, they are stronger and can be used in more demanding situations. Grade 8 bolts have 6 evenly spaced radial lines. Grade 8 bolts have a tensile strength of 150,000 PSI.

What is the metric equivalent to Grade 8?

Approximate Equivalency Chart Metric/US Roughly Equivalent US Bolt MaterialsMetric Nut ClassSAE J429Normally UsedGrades8.8859.895+10.910or 12812.910or 12.3 more rows

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

Grade 8 / Grade G 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.

Is stainless stronger than steel?

Stainless steel has a low carbon content which cannot be hardened, and regular steel is slightly stronger than grade 2 steel, and at the same time it is significantly weaker if compared in the terms of hardness. … When compared to stainless steel, steel is magnetic.

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.

Can I weld Grade 8 bolts?

A grade 8 bolt is no longer a grade 8 bolt after being welded on. It might be this hardened zone is cracking away from the weld due to shrinkage when the thing cools. JTMcC. It’s always a problem to try and weld grade 8 bolts.

Are Grade 8 bolts brittle?

written by Brent Vandervort. In actual fact, Grade 5 bolts are often preferred over Grade 8 . A Grade 8 has a very high tensile strength, but can be brittle. … It’s often much safer to use a Grade 5 bolt which will bend, thus providing a warning, rather than a Grade 8 bolt breaking without warning.

Will Grade 8 bolts rust?

Grade 8 bolts have 6 evenly spaced radial lines on the head.” Unlike stainless steel, which is highly resistant to corrosion, steel, however reinforced, will oxidize over time and rust. Grade 8 bolts that are not galvanized or plated with yellow zinc, however, are cheaper.

Is grade C the same as Grade 8?

Grade C. Grade C is a thru-hardened medium carbon zinc plated alloy steel. No head markings (manufacturers mark may also be included). Finish is equivalent in strength to Grade 8 but without the yellow color.

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 10.9Similar to Grade 8.Metric Class 12.9The highest metric class for strength, it exceeds Grade 8.12 more rows

Is stainless harder than Grade 8?

Stainless is very soft stell with a Nickel plate, hence the “stainless” qualites. Grade 8 stuff has a very high carbon content, making it very hard and much stronger.

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.