Best answer: What is Bolt number?

Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt. For most home and automotive applications, you won’t need anything more than a grade 8 bolt strength or metric class 10.9.

What does #8 bolt mean?

Their size is described as diameter, number of threads per inch (if used with a nut or in a threaded hole), and length in inches. … In all cases, the larger the number, the larger the size. Consequently a #8 screw is larger than a #4 screw, just as a 3 inch bolt is larger than a 2 inch bolt.

What is bolt identification?

Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only).

How do I know if my bolts are metric or standard?

Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric.

What are bolt grades?

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.

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What do screw numbers mean?

Screw sizes are designated by a number that indicates the diameter and the length of the screw in inches (Table 10-2). The smallest diameter screw is 0, and the largest commonly available is 24. For bench work, the most useful sizes are 4 through 12. Of those sizes, 6, 8, and 10 are probably used more than any others.

What does M14 mean on a bolt?

M14 means it is metric with a 14mm outside diameter.

What does M6x20 mean?

M6x20 is a 6mm bolt 20mm long. That only works for metric. Different from a standard bolt designation like a 1/4×20, which is the diameter and thread pitch instead of length.

What is the meaning of 4.6 grade bolt?

The specification Class 4.6 Threaded Rod is a standard that covers fasteners manufactured from either Low carbon steel or medium carbon steel. … The ultimate material strength of Grade 4.6 Threaded Rod is 40 Mpa while its yield strength or the proof stress is 60% that of the ultimate strength.

Whats stronger Grade 8 or Grade 5 bolt?

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. Grade G is roughly equivalent to Grade 8.

What does 4.8 mean on a bolt?

For example, a bolt with a performance grade of 4.8 means:

The nominal tensile strength of bolt material is 400 MPa. The yield-strength ratio of bolt material is 0.8. The nominal yield strength of bolt material is 400 x 0.8=320 MPa.

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How do I know if I have a M8 bolt?

The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that’s slightly under 8mm which means that the bolt should fit through an 8mm hole.

How can you tell if a bolt is zinc plated?

Hot dip galvanising or zinc plating can be used on anything from small nuts and bolts to large beams for buildings. The steel is put in a big bath, where the coating is applied. If it’s galvanised, it will be dull grey and a little rough. A zinc plated product will be shiny and smooth.