How Can You Tell A Grade 8 Nut?

What does ASTM a193 mean?

ASTM A193 is the standard specification for alloy-steel and stainless steel bolts used in high-temperature or high-pressure environments or other special-purpose applications..

What is a Grade 8 nut?

A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch.

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 stainless harder 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.

What is the hardest grade bolt?

Bolt Grade Markings and Strength ChartGrade and MaterialMechanical PropertiesProof Load (psi)Class 8.8 Medium carbon steel, quenched and tempered600Class 10.9 Alloy steel, quenched and tempered830Class 12.9 Alloy steel, quenched and tempered97014 more rows

What grade is a case hardened bolt?

Grade 5 bolts are commonly found in many automotive applications that call for a hardened bolt but not as brittle as fully hardened. 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.

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.

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 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 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 color is a Grade 8 bolt?

ColoryellowHead StyleHexManufacturer GradeGrade 8MaterialSteelMeasurement SystemInch10 more rows

What is Grade b7 steel?

Grade B7 is a heat-treated chromium-molybdenum alloy steel with minimum tensile requirement of 100 ksi, yield of 75 ksi and maximum hardness of 35 HRC. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment, recommended nuts-washers for Grade B7 fasteners.

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%.

Are titanium bolts stronger than steel?

When alloyed with other metals such as aluminium or vanadium, titanium becomes dramatically stronger than many steels. In terms of sheer strength, the best titanium alloys beat low to medium grade stainless steels. However, the highest grade of stainless steel is stronger than titanium alloys.

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 type of steel is Grade 8?

carbon alloy steelGrade 8 bolts are comprised of carbon alloy steel, thus giving them a high psi rating. Zinc or yellow zinc grade 8 bolts are available to resist corrosion.

What is a Grade 8 bolt made of?

Strength 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.

Is b7 the same as Grade 8?

With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. It is also quenched and tempered at 800 F leading to its strength.

What is the hardest bolt you can buy?

BUMAX® Ultra – the world’s strongest bolt Since its launch in 2014, the BUMAX® Ultra range has proven that it is capable of exceeding tensile strengths of between 1 500 to 1 700 MPa on various applications, with good corrosion resistance and an operating range of between -50 and 400°C.

Are Grade 8 bolts hardened?

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.