This specification covers two types of quenched and tempered steel heavy hex bolts in metric and imperial sizes for structural purpose. Metric size bolts are produced from M12 to M36 as per ASTM A325M & imperial size bolts are produced from 1/2" to 1-1/2" as per ASTM A325. These boltings are intended for used in structural connections. FerroBend manufactures and supplies ASTM A325 Type 1 & Type 3 heavy hex bolts with EN 10204 Type 3.1 Certification.
| Grade | Class | |||||
|---|---|---|---|---|---|---|
| Type 1 | Carbon Steel, Carbon Boron Steel, Alloy Steel or Alloy Boron Steel | |||||
| Type 2 | Withdrawn | |||||
| Type 3 | A | B | C | D | E | F |
| Element | Type 1 % | Type 3 % | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Carbon Steel | Carbon Boron Steel | Alloy Steel | Alloy Boron Steel | A | B | C | D | E | F | |
| Carbon | 0.28 - 0.55 | 0.28 - 0.55 | 0.28 - 0.55 | 0.28 - 0.55 | 0.31 - 0.42 | 0.36 - 0.50 | 0.14 - 0.26 | 0.14 - 0.26 | 0.18 - 0.27 | 0.19 - 0.26 |
| Manganese | 0.57 min | 0.57 min | 0.57 min | 0.57 min | 0.86 - 1.24 | 0.67 - 0.93 | 0.76 - 1.39 | 0.36 - 1.24 | 0.56 - 1.04 | 0.86 - 1.24 |
| Phosphorus | 0.048 max | 0.048 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
| Sulfur | 0.058 max | 0.058 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max |
| Silicon | 0.13 - 0.32 | 0.08 - 0.32 | 0.13 - 0.37 | 0.13 - 0.37 | 0.13 - 0.37 | 0.25 - 0.55 | 0.13 - 0.37 | 0.20 - 0.55 | 0.13 - 0.37 | 0.13 - 0.37 |
| Boron | -- | 0.0005 - 0.003 | -- | 0.0005 - 0.003 | -- | -- | -- | -- | -- | -- |
| Copper | -- | -- | -- | -- | 0.22 - 0.48 | 0.17 - 0.43 | 0.17 - 0.53 | 0.27 - 0.53 | 0.27 - 0.63 | 0.17 - 0.43 |
| Nickel | -- | -- | -- | -- | 0.22 - 0.48 | 0.47 - 0.83 | 0.22 - 0.53 | 0.47 - 0.83 | 0.27 - 0.63 | 0.17 - 0.43 |
| Chromium | -- | -- | -- | -- | 0.42 - 0.68 | 0.47 - 0.83 | 0.27 - 0.53 | 0.45 - 1.05 | 0.55 - 0.95 | 0.42 - 0.68 |
| Vanadium | -- | -- | -- | -- | -- | -- | 0.010 min | -- | -- | -- |
| Molybdenum | -- | -- | -- | -- | -- | 0.07 max | -- | 0.11 max | -- | -- |
| Titanium | -- | -- | -- | -- | -- | -- | -- | 0.06 max | -- | -- |
ASTM A325M Mechanical Properties |
||||
| Nominal Diameter, mm | Tensile Strength, min, Mpa | Yield Strength, min, Mpa | Elongation in 4D, min, % | Reduction in Area, min, % |
|---|---|---|---|---|
| M12 to M36, Inclusive | 830 | 660 | 14 | 35 |
| Bolt Size, mm | Bolt Length, mm | Brinell | Rockwell C | ||
|---|---|---|---|---|---|
| Min | Max | Min | Max | ||
| M12 to M24, inclusive | Less than 2D 2D and over |
253 -- |
319 319 |
25 -- |
34 34 |
| M25 to M36, Inclusive | Less than 3D 3D and over |
253 -- |
319 319 |
25 -- |
34 34 |
| Bolt Type and Finish | Nut Class & Finish Specification | Washer Finish |
|---|---|---|
| Plain (Non Coated) | ASTM F563/F563M Grade 8S or 8S3, Plain (Non Coated) | ASTM F436/F436M, Plain (Non Coated) |
| Zinc Coated | ASTM F563/F563M Grade 10S, Zinc Coated | ASTM F436/F436M, Zinc Coated |
| Coated in accordance with ASTM F1136M, Grade 3 | ASTM F563/F563M Grade 10S, Coated in accordance with ASTM F1136 | ASTM F436/F436M, Coated in accordance with ASTM F1136 |
| Plain | ASTM F563/F563M Grade 8S3, Plain | ASTM F436/F436M, Plain |
| Grade | Marking Details |
|---|---|
| Type 1 | Type 1 bolts shall me marked "A325M" and "8S". In addition, bolts marked "8.8S" shall be an acceptable marking provided they also meet the requirements of ISO 7412. |
| Type 3 | Type 1 bolts shall me marked "A325M" and "8S3". In addition, bolts marked "8.8S" shall be an acceptable marking provided they also meet the requirements of ISO 7412. The use of additional distinguishing marks to indicate the bolts are weathering steel shall be the manufacturer's discretion. |