**Contents**show

## What is a Grade 1 bolt?

Grade 1 – SAE J429

Bolts, Screws and Studs. Low or medium carbon steel. 1/4″ – 1-1/2″ 33,000.

## What is tensile strength of bolts?

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. The grades are indicated on top of the bolts as raised numbers or dashes. There are three main systems of bolt classification: SAE, Metric and ASTM.

## How strong is a 1 inch bolt?

Proof Load

Nom Bolt Size (in) | Grade | |
---|---|---|

2 | 8 | |

1 1/4 | 32000 | 116300 |

1 3/8 | 38100 | 138600 |

1 1/2 | 46400 | 168600 |

## What is the tensile strength of a steel bolt?

Bolt Grade Markings and Strength Chart

Head Marking | Grade and Material | Mechanical Properties |
---|---|---|

Min. Tensile Strength (psi) | ||

Class 10.9 Alloy steel, quenched and tempered | 1040 | |

Class 12.9 Alloy steel, quenched and tempered | 1220 | |

Usually Stamped A-2 or A-4 | A-2 & A-4 Stainless Steel alloy with chromium and nickel | 500 Min. 700 Typical |

## What do you mean by tensile strength?

tensile strength, maximum load that a material can support without fracture when being stretched, divided by the original cross-sectional area of the material. … When stresses less than the tensile strength are removed, a material returns either completely or partially to its original shape and size.

## How do you calculate tensile strength?

a) the tensile strength, also known as the ultimate tensile strength, the load at failure divided by the original cross sectional area where the ultimate tensile strength (U.T.S.), σ _{max} = P _{max} /A _{} , where P _{max} = maximum load, A _{} = original cross sectional area.

## 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. |

## How do you measure tensile strength?

Tensile strength is often referred to as ultimate tensile strength and is calculated by dividing the peak tension force the sample withstands by its cross sectional area. A tensile tester is used to measure tensile strength. A load cell is fitted to the tensile tester to measure tensile force.

## How much weight can a bolt support?

For example, an eye bolt with a 1/4 inch shank can typically hold up to 600 pounds at a straight pull (no angle). However, at a 15 degree angle, the maximum weight capacity drops to 480 pounds (80% of the “straight pull” weight capacity).

## How much weight can a Grade 8 1/2 inch bolt hold?

The tensile strength of a grade 8 bolt is 150,000 pounds per square inch. Tensile strength is the maximum load in tension (stretching) that a part can carry without breaking.

## How much torque does a 1/2 inch bolt have?

US Recommended Bolt Torque

Size | Recommended Torque | |
---|---|---|

Grade 2 | 18-8 S/S | |

1/2″ | 37 | 45 |

9/16″ | 53 | 63 |

5/8″ | 73 | 104 |

## What grade are high tensile bolts?

High tensile steel bolts

Grade 8.8 high tensile steel is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc. It can be plated in many other coatings.

## What is a 12.9 grade bolts?

Grade 12.9 Hex Bolts are high strength bolts with 1100MPa minimum yield strength and 1220MPa minimum tensile strength. … The Grade 12.9 Material is quenched and tempered to provide hardness and strength to the bolts.

## What is the tensile strength of steel?

The tensile strength for structural steel is 400 megapascals (MPa) and for carbon steel it is 841 MPa. Tensile strength values are different for different densities of steel. There are three types of tensile strength: Yield strength – The stress a material can withstand without permanent deformation.