What is the standard grade for bolts?
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.
What are SAE Grade 5 bolts?
Grade 5. Manufactured from medium carbon steel and hardened for greater strength and durability, 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 or those that require medium strength.
What does SFC mean on a bolt?
Safety critical fasteners for the oil and gas Industries. SFC has extensive capabilities for machined components.
What is the strongest bolt grade?
grade 8
Grade 9 Bolts 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.
What are ASTM grades?
What are ASTM Grades.. ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by “Grade”.
What does 10.9 mean on top of a bolt?
Property Class 10.9 bolts have a minimum tensile strength of 1040 MPa for all sizes. As you can see, they’re slightly stronger than the nominal value in the property class designation. Property Class 10.9 bolts are considered high-strength parts.
What is ASTM F3125?
ASTM F3125 is a standard material specification covering chemical, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel in inch dimensions, in two strength grades, two types and two styles.
How do I choose a bolt grade?
This is how you choose the right bolt for the joint:
- First, identify the load case.
- Determine the necessary clamping force in the joint.
- Choose the smallest bolt diameter that can support the clamp load.
- Choose an effective bolt securing method.
- Decide on the most appropriate tightening method.
Will a Grade 5 bolt rust?
This is a stainless alloy that is harder than 18-8 stainless steel, but it’s less resistant to corrosion. Steel fasteners are available in grade 2, grade 5, grade 8, and alloy steel and are usually plated with a slightly bluish or yellow zinc coating, or are galvanized to resist corrosion.
Is stainless stronger than Grade 8?
A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.
What does SC mean on a bolt?
“SC” signifies a slip-critical connection where the bolts are not being used in shear, but instead, the tension from the connection resists the shearing force. You simply require the same standard A325 heavy hex structural bolt but will be using them in three different connection types. SC. Slip-critical connection.
What do the ASTM numbers mean?
ASTM’s designation system for metals consists of a letter (A for ferrous materials) followed by an arbitrary sequentially assigned number. These designations often apply to specific products, for example A548 is applicable to cold-heading quality carbon steel wire for tapping or sheet metal screws.