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ASTM A307 Heavy Hex Bolts

ASTM A307 Bolts are specified to have carbon steel and in the range of ¼ inches to 4 inches of diameter. There are three major grades as A, B and C in this specification often made from the A36 round bars. BRK Industries is a leading manufacturer and supplier of the different types of the Astm A307 Threaded Rod in the different types. The different types are specified with tensile strength, configuration and the different application types. The mechanical properties vary for the different application requirements.

  • ASTM A703
  • Materials – Carbon Steel Bolts in ASTM A307 (Grades A and B)
  • Size: M24 to M36
  • Finish: BZP, HOT DIP GALV. & BLACK
  • Thread: METRIC

ASTM A307

The Astm A307 Grade A Bolts is headed bolt, threaded rod and bent bolt type for general purpose applications. The grade B is heavy hex bolts and studs for flanged joints. The astm a307 hex bolt can be used with tools and applied high torque force to tighten it in place. The type C bolts are non-headed anchor bolts. These can be bent or straight and are intended for structural usages. The A307 Anchor Bolt is painted green for identification. This part will project out from the concrete structure. Depending on the customer requirements, some of the anchor bolts are marked permanently. The A307 Thru Bolt and others in the grade A come with 60ksi minimum tensile strength while grade B can range from 60 to 100ksi and grade C from 58 to 80ksi minimum tensile strength values. The astm a307 stud bolt is used with applications where the stud is needed. The material has carbon, manganese, phosphorus and sulfur in the composition.

ASTM A307 Bolts Mechanical Properties

Grade

Tensile strength – ksi

Elongation % min

A

60 min

18

B

60 – 100

18

Chemical Properties Of A307 Thru Bolt

Element

Grade A % max

Grade B % max

Carbon

0.29

0.29

Manganese

1.20

1.20

Phosphorus

0.04

0.04

Sulfur

0.15

0.05

Astm A307 Bolt Equivalent Grade

Diameter Range Metric Grade Approximate ASTM Equivalent grade Description Tensile, min Yield, min
Mpa ksi Mpa ksi
All 4.6 A307A Low or medium carbon steel 400 58 240 35
through 1″ (M24) 5.8 – Cold worked low or medium carbon steel 520 75 420 61
through 1″ (M24) 8.8 A449 Heat treated medium carbon steel 830 120 660 96
above 1″ (M24) 8.8 A193B7/A354BC or F1554G105 Heat treated medium carbon steel 830 120 660 96
through 1-1/2″ (M36) 8.8.3 A325 Type 3 / A449 Type 3 Heat treated medium carbon weathering steel 830 120 660 96
All 10.9 A490/A354BD Heat treated medium carbon alloy steel 1040 151 940 136
through 1-1/2″ (M36) 10.9.3 A490 Type 3 Heat treated medium carbon alloy weathering steel 1040 151 940 136
All 12.9 A574 Heat treated alloy steel 1220 177 1100 160

Recommended Nuts And Washers For A307 Anchor Bolt

Bolt

Nut

Washer

  Grade A  – 1/4 inch to 11/2 inches

    A563A Hex

F844

  Grade A  – 11/2 inches to 4 inches

    A563A Heavy hex

F844

  Grade B  – 1/4 inch to 4 inches

    A563A Heavy hex

F844

A307 Bolt Grade

A Headed bolts, threaded rods and bent bolts intended for general applications.
B Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
C Nonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. *As of August 2007, grade C has been replaced by specification F1554 grade 36.
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