What does FMI mean on a bolt?
What does FMI mean on a bolt?
Russian. Excellence through Precision. Femico (FMI) is a leading manufacturer of nuts, bolts, screws and other specialty bolts.
What do the letters on top of bolts mean?
The markings can identify the standard to which the bolt was made. For instance, if a bolt head contains three radial lines, then it’s a Grade 5 bolt. If it contains five radial lines, then the bolt is Grade 8.
How do I identify my bolt manufacturer?
Manufacturer’s identification mark, e.g., “X” ( on head of bolts and screws and on one end of studs and stud bolts). Manufacture’s identification mark, e.g., “X”, applied to head (raised or depressed at option of manufacturer).
What do hash marks on a bolt mean?
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. The higher the grade, the stronger the bolt.
What do the numbers and letters mean on bolts?
What does B on a bolt head mean?
ASTM A307 Grade B Grade B bolts and studs have a tensile strength between 60 ksi and 100 ksi.
What are the markings on a Grade 8 bolt?
Bolt Grade Markings and Strength Chart
| Head Marking | Grade and Material | Mechanical Properties |
|---|---|---|
| Min. Tensile Strength (psi) | ||
| 3 Radial Lines | Grade 5 Medium carbon steel, quenched and tempered | 120,000 |
| 105,000 | ||
| 6 Radial Lines | Grade 8 Medium carbon alloy steel, quenched and tempered | 150,000 |
What are the different bolt grades?
The most common grading system used for bolts in the U.S. is the SAE system, but you can find metric grading systems as well. There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength.
In what way are an standard steel bolts identified?
AN standard steel bolts are marked with either a raised dash or asterisk; corrosion resistant steel is indicated by a single raised dash; and AN aluminum alloy bolts are marked with two raised dashes. Additional information, such as bolt diameter, bolt length, and grip length may be obtained from the bolt part number.
