Strength Requirements by Grade
| Specification | Material and Treatment | Mechanical Properties |
|---|---|---|
| Yield Strength Min (ksi) | ||
| A307 Grade C | Low or Medium Carbon Steel | 36 |
| F1554 Grade 36 | Low or Medium Carbon Steel | 36 |
| F1554 Grade 55 | Low or Medium Carbon Steel | 55 |
What is a high strength bolt?
High strength bolts or structural bolts are made to be used with heavy hex nuts to connect structural members. To be considered a structural connection, it has to conform to specific ASTM standards; specifically, ASTM A563 or ASTM A194. Structural bolts are also categorized by grades.
How strong is Grade A307?
60,000 psi
Governing StandardsA307 Covers the mechanical and material requirements for inch series fasteners in diameters from 1/4″ through 4″, made of carbon steel having a minimum tensile strength of 60,000 psi.
What does 307 on a bolt mean?
ASTM A307 Grade A Carbon Steel Bolting with minimum tensile of 60 ksi. ASTM A307 Grade A is grade specification in carbon steel bolting for use in general purpose application. This grade covers hex headed bolts, stud bolts, threaded rods or any other bolting having a minimum tensile strength of 60 ksi.
What strength is a Grade 5 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 grade of bolt is stronger?
grade 8
Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
Is A307 a Grade 5?
A307 is basically an ungraded bolt and A325 is grade 5 or so.
What grade is a 307A bolt?
Grade 1
307A bolts are a Grade 1 equivalent that is used in low-strength application. It has lower hardness and tensile requirement than grade 2 bolts. It is generally used in low-pressure, standard or normal temperature applications and is made of low carbon steel.
What are the grades of ASTM A307 bolts?
MD Exports LLP manufacturing these A307 bolts in two grades, A and B. Grade A – headed bolts, threaded rods and bent bolts with a minimum tensile strength of 60 ksi for a wide range of general-purpose applications.
Which is a better bolt A307 or A325?
Today, F1554 is the recommended specification for anchor bolts. There are 3 grades of F1554: Gr. 36, Gr. 55, and Gr. 105. An A307 bolt has material strengths similar to F1554 Gr.36. The A307 bolts may be OK.
What’s the difference between A307 Grade A and B anchors?
A307 grade A covers bolts for general applications, while A307 grade B covers heavy hex bolts and studs for cast iron flanges. There used to be an A307 grade C specification covering anchor bolts, but it was eliminated in 2007 and subsequently replaced by F1554 grade 36.
What are the names of the high strength bolts?
The high strength bolts are ASTM A325 and ASTM A490. The non-high strength bolt is ASTM A307. New with the SCM 14th addition is the introduction of bolt “Groups” in SCM J3.1 for high strength bolts.
