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What Does 307a Mean on a Bolt?

FAQs Jackson Bowman July 21, 2022

ASTM A307 Class A Carbon steel fittings with a minimum tensile strength of 60 ksi. ASTM A307 Grade A is a grade specification for carbon steel fittings for use in general service. This class includes hex head screws, studs, threaded rods or other screws with a minimum tensile strength of 60 ksi.

What are 307a bolts used for?

Grade A307

Heavy duty hex head bolts and studs for flange connections in piping systems with cast iron flanges. Headless anchor bolts, either curved or straight, for structural anchoring purposes.

What is bolt grade A307?

ASTM A307 Class A is a standard material specification for medium strength carbon steel fasteners, particularly screws, studs and threaded rods for general applications. Grade A is a heat treated carbon steel fastener material with a minimum tensile strength of 60 ksi and a hardness range of 121 to 241 BHN.

Are A307 bolts high strength?

A307 bolts are not considered high strength bolts. For example, in wood applications, A307 screws are typically used. Class B A307 bolts can have higher strength and are used for various applications. Typically, this type of bolt is used in piping systems intended for cast iron flanged connections.

What do the letters on top of bolts mean?

The markings can identify the standard to which the screw was made. For example, if a bolt head contains three radial lines, it is a grade 5 bolt. If it contains five radial lines, the bolt is grade 8.

What size bolt is 307A?

These 307A grade zinc plated screws are threaded 5/16-18 and are 4″ long with threads running through.

What grade steel is A307?

ASTM A307 Class A Carbon steel fittings with a minimum tensile strength of 60 ksi. ASTM A307 Grade A is a grade specification for carbon steel fittings for use in general service. This class includes hex head screws, studs, threaded rods or other screws with a minimum tensile strength of 60 ksi.

Is A307 the same as Grade 2?

You will often hear that grade A307 and grade 2 screws are equivalent. Although the differences are small, they are all referred to as “low-carbon” fasteners. A307 is an ASTM (Industrial) specification while Class 2 is a SAE J429 Class 2 (Automotive) specification.

Is A307 stainless steel?

ASTM A307 carbon steel screws and bolts, 60,000 psi tensile strength. ASTM A320 Alloy steel and stainless steel bolting materials for low temperature service. ASTM A325 Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. Superseded by ASTM F3125.

Is A307 a Grade 5?

ASTM A307 Self-Tapping Screw: For use in drilled and tapped full-length threaded holes. Used in place of a bolt and nut. Class-5 Threaded Bolts: Used to mount motors to machines; also popular in car and truck repair.

Is Grade 5 stronger than A307?

Basically they are the same. There are variations in hardness, size, thread as well as ASTM between them.

What is the difference between A307 Grade A and B?

ASTM A307 is a specification covering mild steel fasteners. There are two classes within the ASTM specification. A307 Class A covers general purpose bolts, while A307 Class B covers heavy duty hex bolts and studs for cast iron flanges.

What is the yield strength of A307 bolts?

What do the numbers and letters on bolts mean?

Each variety has a specific screw strength. Regardless of which system is used to classify the bolts, the higher the number, the stronger the bolt. For most home and automotive applications, all you need is a bolt strength of class 8 or metric class 10.9.

How do I identify my bolt manufacturer?

Manufacturer’s identifier, e.g. B. “X” (on the head of bolts and screws and on one end of studs and studs). Identification mark of the manufacturer, e.g. B. “X” applied on the head (raised or recessed at the manufacturer’s choice).

How do you read a bolt?

References:

  1. https://www.portlandbolt.com/technical/specifications/astm-a307/
  2. https://boltport.com/specifications/astm-a307-grade-a/
  3. https://engineerexcel.com/compared-a307-vs-a325/
  4. https://www.mudgefasteners.com/news/2021/1/24/deciphering-bolt-head-markings
  5. https://www.amazon.com/Full-Thread-307A-Head-16-18/dp/B07NTNQLRQ
  6. https://boltport.com/products/astm-bolts/astm-a307-grade-a/
  7. https://www.bayoucitybolt.com/hex-bolts-a307-a307b.html
  8. https://www.portlandbolt.com/technical/specifications/
  9. http://www.fasnetdirect.com/refguide/CapScrewtapbolts.pdf
  10. https://engineerboards.com/threads/how-are-a307-bolts-discontinued-what-are-grade-5-bolts.29173/
  11. https://www.sunflexmetal.com/carbon-steel-pipe-fittings-astma234-fittings/carbonsteel-bolts-type-astma307-carbonsteel-anchor-bolts.html
  12. https://www.portlandbolt.com/technical/strength-requirements-by-grade/
  13. https://www.homedepot.com/c/ab/grades-of-bolts/9ba683603be9fa5395fab90189731df8
  14. https://idot.illinois.gov/Assets/uploads/files/Doing-Business/Manuals-Guides-&-Handbooks/Highways/Materials/Metals/fasteneridentificationguide.pdf
  15. https://www.youtube.com/watch?v=78R1QXL9ijM

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