Both ASTM F568M and ISO 898-1 outline several grades of metric fastener, from low carbon/low strength, up to high strength/heat treated alloy grades. The equivalents listed below should be only considered as rough equivalents. Special care should be taken before substituting grades to make sure that an acceptable substitute is being used. For example, grade 8.8 has the same mechanical requirements all the way up to M80 (3-1/8”), however the ASTM equivalent, A449, lowers its mechanical requirements as the diameter increases, necessitating a conversation between the purchaser and manufacturer to decide the best way of satisfying the necessary mechanical requirements. Similarly, grade 12.9, where as common in metric circles, has as its only ASTM mechanical equivalent, A574. A574, however, is a socket head cap screw standard, so studs and hex bolts are left out and do not have a direct equivalent.
Portland Bolt is happy to help if you have specific questions or needs. We cannot manufacture metric sizes or bolts to metric grades, and we are not able to make recommendations, but we can work with you to determine what is feasible and cost effective if a substitution is allowed.
As always, an engineer should be consulted before grade substitutions are made.
| Diameter Range | Metric Grade | Approximate ASTM Equivalent | 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 / F3125 Grade A325 | 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 |
what is the youngs modukus value for ASTM A574 material?
@Dinesh- We are sorry, but we don’t have that information.
for A307A how its measurement mention in MTC ..? in inch or Metric ,why..?
suppose if mention in metric(eg:M12x100) in mtc its is acceptable..? please replay
@Nisa- We are sorry, but are unsure of what you are asking. We sell and can manufacture inch-dimensioned products. We do not handle metrics nor do we know much about them.
Dear,
Can you please advise for below alternative Bolts/Nuts material. Application is Deaerator Columns, for bolting Columns to module structure:
1. ASTM A325M T-1 in place of Gr. 8.8 for Bolts
2. A194 Gr 2H in place of ASTM A563 Gr. DH for Nuts
@Bilal- For the bolts, those grades are very similar from a chemical and mechanical standpoint, but any substitution should approved by the project engineer as there are subtle differences between the two. For the nuts, A194 2H is an allowable substitution per ASTM.
is it possible to use 10.9 as equivalent to a193 b7?
as I know, A193 B7 bolt is low alloy steel fit to high temprature service up to around 400 C, while all bolts manufactured to iso 898 (such like 10.9) is normally applicable to be used only under 150 C.
So Im worry that 10.9 cannot replace B7 bolt in high temprature service.
@Abdelaziz- You are correct, 10.9 should not be substituted for A193 B7 without an engineer’s approval. B7 is formulated for high temperature applications, whereas 10.9 is for general purpose use.
is that ok to use material C1015 to produce the item which requires grade 5.8?
kindly ask you to reply, thank you
@Leon- As long as the C1015 material you chose to use meets the mechanical and chemical requirements of 5.8, then you can use it. C1015 is typically furnished as chemicals only, so you may need to test it to assure the proper mechanical requirements are met.