Quick Answer: What Grade Is A 12.9 Bolt?

Is a 10.9 Bolt stronger than Grade 8?

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.

A low carbon steel for general use..

What is the highest grade of bolt?

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.

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.

What is stronger Grade 5 or 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.

How strong is a grade 12.9 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.

How can you tell if a bolt is Grade 5?

Grade 5 bolts are case hardened, meaning the bolt has been heated enough to hardened the outside of the bolt but not enough to harden the inside portion. Grade 5 bolts are identified by 3 evenly spaced radial lines on the head.

Are stainless steel bolts stronger than Grade 8?

Stainless commonly comes in grades 18.8 (304) or T316. Stainless steel bolts are rated for corrosion resistance. … 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.

What grade is a bolt with 6 marks?

Bolt Grade Markings and Strength ChartHead MarkingGrade and MaterialMechanical PropertiesProof Load (psi)3 Radial LinesGrade 5 Medium carbon steel, quenched and tempered74,0006 Radial LinesGrade 8 Medium carbon alloy steel, quenched and tempered120,000Grade A325 Carbon or Alloy Steel with or without Boron85,00014 more rows

Is 304 or 316 stainless better?

When it comes to 304 stainless steel vs. 316 stainless steel, while both are good for corrosion resistance, strength, welding, and heat resistance, 316 stainless steel gets the slight edge in all these categories due to variation in alloying elements.

How can you tell a Grade 8 nut?

Grade 5 auts shall be marked with three circumferential dashes equally spaced 120° apart. Grade 8 nuts shall be marked with six circumferential dashes equally spaced 60° apart.

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.

What is the difference between a 10.9 and 12.9 Bolt?

For most applications, property class 10.9 fasteners gives the best compromise between strength and brittle fracture risk. … (For example the fatigue endurance strength of a typical 12.9 fastener is the same as that for a 10.9 or an 8.8 fastener.)

What is the hardest bolt grade?

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 does 12.9 mean on a 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.

Are higher grade bolts more brittle?

Stronger bolts are often harder and so tend to be more brittle. Rather than stretch as required for situations the equipment’s manufacturer had selected the original bolt to meet, the higher grade fastener snaps off.

What does 10.9 on a bolt head mean?

The grade 8.8 refers to the tensile strength which is generally 116,000 psi, grade 10.9 is generally 150,000 and grade 12.9 is generally 175,000 psi.

What grade bolt means?

Bolts are made of different grades of steel. The grade of a bolt determines the maximum amount of stress (tensile strength) that the bolt can handle. Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is also dependent upon the grade of the bolt.

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.

How hard is a 10.9 bolt?

Used in automotive applications and for bolting large and forged parts, metric 10.9 bolts exhibit high tensile strength and good wear resistance. Our metric grade 10.9 bolts meet ASTM A324 grade BD and SAE J429, grade 8 standards. The yield strength of the bolts is 940 and the tensile strength is 1040 MPa.

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.

Is a 12.9 Bolt stronger than Grade 8?

A quick internet search shows that Class 8.8 has a yield strength of 660 MPa while Class 12.9’s yield strength is 1100 MPa.