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 alternative for LA-8740 bolt
@Hermant- Apologies, but we are not familiar with LA 8740 bolts. If you had more information, we would be happy to look into it.
May I know if A193 B7 M48 bolt is a rolled or cut thread type?
@Hilmi- threads can be produced by either method, so you will need to check with your supplier and find out how they are producing theirs. If we were to manufacture a bolt of that size (albeit in an imperial equivalent size), we would cut thread them.
According to ASTM A163 GradeB7 (ASTM F1554 Grade 105) minimum specified yield strength 0.2 percent offset, fya is 105,000 psi (724 Mpa) and for ISO 898-1 Class 8.8. has 92,800 psi (640Mpa). Can you still please confirm equivalence betwen ASTM A163 GradeB7 (ASTM F1554 Grade 105) and ISO 898-1 Class 8.8 (Source ICC-ES Report ESR-3187 Table 3). Thank you!
@Milos- We can confirm that the two grades (ASTM A193 B7 and ISO 898-1 Gr.8.8) share many similarities, and in many cases can be substituted for one another. We cannot say however, that they are exactly equivalent, only similar.
Hi
Looking for 10.9 imperial bolts or Caterpillar bolts do you keep these bolts
@Heinrich- Apologies, we do not stock any 10.9 or standard Caterpillar bolts. We specialize in custom construction anchor bolt. We can make specials for the OEM industry, and would be happy to quote if you are needing something nonstandard, but it isn’t our primary niche.
Hi Dane
Is an ISO 898-1 grade 5.6 equivalent to ASTM 307 Grade B?
I’ve noticed in the above table 5.6 is not mentioned (either 4.6 or 5.8)
Thanks in advance!
@Alejandro- ISO 898-1 class 5.6 is a valid property class. It appears to be very similar to 5.8, but with slight variations in the required chemistry and mechanicals. It also requires a charpy impact test. We would say that it is similar to A307B in that it is mild steel and lower in strength, but it is not an identical crossover.