Quick Answer: What Does 9.8 Mean On A Bolt?

Is code for 8.8 grade bolt?

i) Bolts of property class 8.8 and 19.9 as covered in IS 3757 : 1958 ‘High strength structural bolts ( second revision )’ have been specified.

ii) In addition to friction type joints, joints subjected to tensile force only in the direction of the bolt axis and bearing type joints have been covered..

What is the meaning of 8.8 grade in a bolt?

8.8- This type of grade is often referred to as the structural grade for bolts. … When a bolt has a grading of S, it means that it can withstand a stress of 45 to 49.9 metric tonnes per 6.45 cm². This grading, which is typically stamped on the head of the bolt, has the same tensile strength as a grade 8.8 bolt.

Is 1367 a bolt grade?

IS 1367, Part 14: Stainless steel threaded fasteners. This standard covers the requirements of bolts, screws, studs and nuts made from austenitic, ferritic and martensitic grades of corrosion – resistant stainless steels for nominal thread diameters from 1.6 up to 39 mm.

What is the hardest bolt you can buy?

The world’s strongest bolts are stainless. 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 are M sizes bolts?

The “M” designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres (e.g., an M6 screw has a nominal outer diameter of 6 millimetres).

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.

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.

What do the letters on bolts mean?

The lines on the head of a bolt indicate its grade. SAE J429 (Society of Automotive Engineers) bolts have radial lines, whereas ASTM (American Society for Testing and Materials) uses a combination of letters and numbers to indicate the grade.

Is Grade 8 or 10.9 stronger?

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 does a triangle on the head of a bolt mean?

The Triangle means it is a Close Tolerance bolt .

What size is a 9.8 Bolt?

Metric steel bolts, screws and studs – proof and tensile strengthProperty ClassSize Range (mm)Minimum Tensile Strength (106 Pa)8.8M1.6 – M368309.8M1.6 – M1690010.9M5 – M36104012.9M1.6 – M3612203 more rows

What is a Grade 9 bolt?

Grade 9 Hardware. … Grade 9 bolts are made with a 8640 Alloy steel which is the ultimate in high strength steel. The Grade 8 counterpart has a tensile strength of 150,000psi whereas Grade 9 hardware has a tensile strength of 180,000psi.

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

Is 800 a steel code?

IS 800 is an Indian Standard code of practice for general construction in steel. The earlier revision of this standard was done in year 1984 and the latest revision of 2007 was released on 22 February 2008. It is written for use in India.

What type of bolt is the strongest?

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.

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 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.