Table of Contents
What do letters on bolts mean?
The three-letter code is the manufacturer code (for example, HKT stands for Hau Kwang Enterprises) and the numbers (if metric) or radial lines (if SAE) refer to the bolts’ strength. If there are no numbers or lines present, assume the bolt is no better than a grade 2 (low strength).
What does letters on bolt head 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.
What do the numbers on top of bolts mean?
The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head.
What does HT mean in bolts?
[′hī ‚ten·səl ′bōlt] (engineering) A bolt that is adjusted to a carefully controlled tension by means of a calibrated torsion wrench; used in place of a rivet. Also known as high-tension bolt.
What does 48 mean on a bolt?
For instance, a UTS bolt labelled #3-48 is a gauge 3 bolts or screw with 48 threads per inch, and a 1/4-20 screw has a 1/4 inch diameter and 20 threads per inch.
What are Grade 2 bolts used for?
Grade 2 hex head bolts are made from low to medium strength carbon steel and offer a tensile strength of 60,000 to 74,000 psi, depending on the diameter. Contractors, designers, OEMs and maintenance staff turn to grade 2 steel fasteners for non-critical joints and applications, mainly because of affordability.
Is code for HT bolt?
Search HS Code
| HSN Code | Product Description |
|---|---|
| 7318 | Screws, bolts, nuts, coach- screws, screw hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles, of iron or steel |
| 73181500 | Other screws and bolts whether or not with their nuts or washers |
| 73181900 | Other |
What is a grade 2 bolt?
The SAE marking standard starts with grade 2, indicated by a bolt head with no markings whatsoever. A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less. Tensile strength is the amount of pull the bolt can withstand before breaking.
What are bolt grade markings?
The grade of a bolt determines the maximum amount of stress (tensile strength) that the bolt can handle. The SAE marking system uses raised dashes on the bolt head to indicate strength. Metric Bolt Grades—Metric grades are set according to rules set by the ISO (International Standards Organization).
What does the grade on an English bolt mean?
English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade.
What is a proof load on a hex bolt?
Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set. Forgot password? Lost password? Not registered yet?
How can you tell the strength of a bolt?
You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength.
What do the radial lines on a bolt head mean?
English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head. A grade 8 bolt will have 6 radial lines on its head.