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 |
Hi,
Could you please give me the equivalent din material number for ASTM F 1554 Grade 36- 55-105 ?
Thanks.
@Aidin- Apologies, I do not know what those equivalents are.
what is the equivalent ASTM bolt for DIN-933 and DIN-6914. is it possible to change A325 and A490 bolts with these DIN Bolts. is there reference for the same.
@Ranjith- Thank you for your question, but we are unfamiliar with the DIN standards, so cannot help in this case. Apologies.
First off thank you for all the technical information Portland Bolt has brought together and made available to the public. I find myself here almost every work day.
Is it acceptable to use the A193 GR B8 and B8M as a rough equivalent for metric 304 and 316 stainless steel bolts? Also, does the A449 have to be used or is it acceptable to use SAE J429 Gr 5 as a material specification for plain carbon steel metric bolts. I just want to avoid creating issues for our procurement team by using the wrong spec?
@Michael- B8 and B8M is 304 and 316, respectively. As long as you convert the diameter units, using B8/B8M should be fine. As for A449/gr.5, neither will be available (as far as I know) in metric. The approximate metric equivalent to A449/gr.5 is ISO 898 gr.8.8. Those should be pretty easily obtainable.
Hi,
Is heat treatment is required for 6.8 grade.
Thanks.
@Parminder – Apologies, but we are not familiar with any grade 6.8, do you have any more information?
We want to go for Anchor bolts with SI system. For that i found A563M-04 for Nuts, F436M-93 for washers, but F1554 for anchor bolts is available only with FPS system. What shall be refered for its SI equivalent. I failed to found it. Requested to give your openion.
@Vasant – I am not aware of any direct metric equivalent for F1554. That said, if you can find a manufacturer who can manufacture to metric dimensions, there is no reason they cannot just make bolts to meet the chemical and mechanical requirements of F1554, but with metric dimensions.