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.

What does a Grade 6 bolt mean?

Available grades run from 2 to 8, with 8 the strongest. Higher grade numbers almost always mean increased strength (an exception is that some grade 6 bolts were stronger than grade 7).

What is a Grade 4 bolt?

ASTM A194 Grade 4 Specification for high tensile nuts and other internally threaded fasteners, made from heat treated carbon molybdenum steel. ASTM A194 Grade 4 is a standard material specification for high tensile nuts and other internally threaded fasteners, made from carbon molybdenum steel.

What does the grade of bolts mean?

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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Are Grade 6 bolts strong?

Bolt Grade Markings and Strength Chart

Head Marking Grade and Material Mechanical Properties
Proof Load (psi)
3 Radial Lines Grade 5 Medium carbon steel, quenched and tempered 85,000
6 Radial Lines Grade 8 Medium carbon alloy steel, quenched and tempered 120,000

What is a Grade 5 bolt?

Grade 5 Bolts and fasteners are made of medium strength carbon steel and are specified under the Society of Automotive Engineers (SAE). If your application calls for heavier materials, you may need Grade 8 Bolts because they are the hardest and are often used in heavy manufacturing applications.

What grade is the strongest bolt?

Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.

Is Grade 8 or 12.9 stronger?

Special markings on screw heads and nuts identify the fastener’s grade. Replace a graded fastener with same or higher grade (don’t replace a Grade 8 fastener with a Grade 5 or 2).

Table 1.

Grade/Class Strength
Metric Class 12.9 The highest metric class for strength, it exceeds Grade 8.

What is a 6 8 in a grade?

Answer: 6 out of 8 can be expressed as 75%.

Is there a grade 10 bolt?

Class 10. This is a metric nut grading similar to the SAE grade 8 classification, which is used in conjunction with Class 10.9 bolts. This strength of nut is used in automotive, and structural industries, as well as in high temp applications.

What is a Grade 7 bolt?

A194 grade 7 nuts are commonly used nuts for both high temperature and low temperature applications, and is commonly paired with bolts made to either A193 or A320. … When that charpy test passes, the nuts are marked with an “L” to show that they have been tested.

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What are Grade 5 bolts used for?

These bolts are generally used for non-critical joints and applications. A grade 5 bolt is distinguished by 3 radial lines and promises tensile strengths between 105,000 and 120,000 psi. They are most commonly found in automotive applications.

What do numbers on bolts mean?

The first number in each size is the nominal or root (minor) diameter (mm) and the second number is the thread pitch (mm). NOTE: Remember that the nominal bolt diameter is the measurement of the bolt diameter as taken from the bottom of the threads NOT the top (which would be major diameter).

What does 8.8 mean on the head of a bolt?

So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.

What grade is a stainless steel bolt?

Stainless commonly comes in grades 18.8 (304) or T316. 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).