What is the hardness of a Grade 5 bolt?
SAE Bolts / Sockets
| Grade | Material | Hardness |
|---|---|---|
| Grade 2 | Carbon Steel | B80-B100 |
| Grade 5 | Carbon Steel | C25-C34 |
| Grade 8 | Alloy Steel | C33-C39 |
| Sockets | Alloy Steel | C38-C45 |
What does SAE J429 mean?
SAE J429 is a Society of Automotive Engineers specification for fasteners. SAE J429 covers fasteners sizes up to 1-1/2″ inclusive. Used in automotive and related industries, these fasteners can be found in small quantities in automotive and home improvement stores.
What is SAE Grade 5?
SAE steel bolts – grades ranging grade 1 to 8.2 – proof and tensile strength
| SAE Grade | Size Range (in) | Minimum Tensile Strength (103 psi) |
|---|---|---|
| 2 | 1/4 – 3/4 7/8 – 1 1/2 | 74 60 |
| 5 | 1/4 – 1 1 1/8 – 1 1/2 | 120 105 |
| 5.2 | 1/4 – 1 | 120 |
| 7 | 1/4 – 1 1/2 | 133 |
What is harder Grade 5 or Grade 8 bolts?
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.
What is the difference between Grade 2 and Grade 5 bolts?
Grade 2 is a standard hardware grade steel. This is the most common grade of steel fastener and is the least expensive. Except a possible manufacturer’s mark,Grade 2 bolts have no head marking. Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications.
What does J429 stand for?
Grade 8 (SAE J429) is a medium carbon alloy steel with one of the highest tensile strengths available. With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7.
Are Grade 5 bolts rust proof?
Many other grades exist but are used far less often. Grade 2, 5, and 8 are usually plated with a slightly blue-ish or yellow zinc coating, or are galvanized, to resist corrosion.
How is a Grade 5 bolt identified?
Grade 5 bolts are case hardened, meaning the bolt has been heated enough to hardened the outside of the bolt but not enough to harden the inside portion. Grade 5 bolts are identified by 3 evenly spaced radial lines on the head.
What are the grades for SAE J429 fasteners?
SAE J429 covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in sizes to 1-1/2” inclusive.Below is a basic summary the most common grades. SAE J429 covers a number of other grades and grade variations not covered in this summary, including 4, 5.1, 5.2, 8.1, and 8.2.
Which is the SAE grade for tensile strength bolts?
Tensile Strength Bolts Grade Identification Mark SAE J429 standard covers specifications to chemical, mechanical and other material requirements for inch-series carbon and alloy steel bolts, screws, studs, and U-bolts, used in automotive and related industries in sizes up-to 1-1/2 inch, inclusive. SAE J429 Grades
What are the requirements for a J429 bolt?
J429 Mechanical Properties. Grade 2 requirements for sizes 1/4″ thru 3/4″ apply only to bolts 6″ and shorter, and to studs of all lengths. For bolts longer than 6″, Grade 1 requirements shall apply.
What is the chemical composition of SAE J429?
SAE J429 Chemical Composition Grade Material C % S % 1 Low or medium carbon steel 0.55 max 0.025 max 2 Low or medium carbon steel 0.15 – 0.55 0.025 max 4 Medium carbon steel 0.28 – 0.55 0.13 max 5 Medium carbon steel 0.28 – 0.55 0.025 max (4)