Materials · Carbon and alloy steels
Carbon and alloy steel fasteners
HAGUE FASTENERS makes carbon steel fasteners and alloy steel bolting to order in the UK: bolts, studs, nuts and machined parts in EN8 to EN26, 42CrMo4, ASTM B7, L7 and B16, and Durehete high temperature steels, in strength classes 8.8 to 14.9.
8.8 to 14.9
Strength classes, quenched and tempered
B7 / L7 / B16
ASTM A193 and A320 bolting grades
Up to 570°C
Durehete 1055 high temperature bolting
UK, EU, US
Mill origin of every bar we use
Why carbon and alloy steels
The backbone of special bolting
Carbon steel fasteners and alloy steel bolting make up the core of the non-standard parts we make. They give high strength at a sensible cost, respond well to heat treatment, and cover most structural, pressure and machinery joints, from plain mild steel to chromium-molybdenum bolting steels and aerospace-released grades.
Where a joint runs hot, we use creep resisting steels such as B16 and Durehete. For sub-zero duty, L7 is tested for impact toughness at low temperature. Finishes such as zinc flake, zinc nickel or phosphate add corrosion protection.
Grades we use
- Mild steel and 080M40 (EN8)
- 605M36 (EN16), 708M40 (EN19)
- 817M40 (EN24), 826M40 (EN26)
- Classes 8.8, 10.9, 12.9 and 14.9
- ASTM A193 B7, B16 and B5; A320 L7
- BS 4882 B16A
- Durehete 900, 950 and 1055
- Esshete 1250 and Jethete X19
- 42CrMo4, 24CrMo5 and 21CrMoV5-7
Composition
BS 970: 1955 chemical composition
| BS 970: 1955 | C % | Si % | Mn % | Ni % | Cr % | Mo % | S % | P % |
|---|---|---|---|---|---|---|---|---|
| EN3B | 0.25Max | 0.35Max | 1.0Max | – | – | – | 0.06Max | 0.06Max |
| EN1A | 0.07/0.15 | 0.10Max. | 0.80/1.20 | – | – | – | 0.20/0.30 | 0.07Max |
| EN8 | 0.35/0.45 | 0.05/0.35 | 0.60/1.00 | – | – | – | 0.06Max | 0.06Max |
| EN9 | 0.50/0.60 | 0.05/0.35 | 0.50/0.80 | – | – | – | 0.06Max | 0.06Max |
| EN16 | 0.30/0.40 | 0.10/0.35 | 1.30/1.80 | – | – | 0.20/0.35 | 0.05Max | 0.05Max |
| EN19 | 0.35/0.45 | 0.10/0.35 | 0.50/0.80 | – | 0.90/1.50 | 0.20/0.40 | 0.05Max | 0.05Max |
| EN24 | 0.35/0.45 | 0.10/0.35 | 0.45/0.70 | 1.30/1.80 | 0.90/1.40 | 0.20/0.35 | 0.05Max | 0.05Max |
Equivalents
Equivalent designations
| BS 970 1991 | BS 970 1955 EN | AISI/SAE | Werkstoff |
|---|---|---|---|
| 070M20 | EN3B | 1020 | 1.0402 |
| 220M07 | EN1A | 1113 | 1.0711 |
| 230M07 | EN1A | 1213 | 1.0715 |
| 080M40 | EN8 | 1040 | 1.1186 |
| 080A42 | EN8D | 1042 | – |
| 070M55 | EN9 | 1055 | 1.0535 |
| 605M36 | EN16 | – | – |
| 708M40 | EN19 | 4140 | 1.7225 |
| 817M40 | EN24 | 4340 | 1.6582 |
High temperature
High temperature bolting steels
For hotter service still, see A286 (A453 660), Nimonic 80A and Inconel 718.
| Grade | Name | Werkstoff number | ASTM | BS | Temperature use |
|---|---|---|---|---|---|
| Durehete 900 T22 | 42CrMo5.6 | 1.7233 | – | BS1506 631-850 | Up to 480°C |
| Durehete 950 T31 | 40CrMoV4.6 | 1.7711 | ASTM A193 B16 | BS1506 671-850 | Up to 510°C |
| Durehete 1055 T41 | 20CrMoVTiB4.10 | 1.7729 | – | BS1506 681-820 | Up to 570°C |
| 25CrMo4 | – | 1.7218 | – | – | Up to 400°C |
| 21CrMoV5.7 | – | 1.7709 | – | – | Up to 540°C |
| 42CrMo4 | – | 1.7225 | ASTM A193 B7 | BS1506 630-860 | Up to 450°C |
Mechanical properties
ISO 898-1 bolting: mechanical properties
| Grade | Material | Size range | Tensile strength MPa min. | Proof strength MPa min. | Core Rockwell hardness min. | Core Rockwell hardness max. | Yield strength MPa min. |
|---|---|---|---|---|---|---|---|
| 4.6 | Low or Medium Carbon Steel | M5 to M39 3/16” to 1-1/2” |
400 | 225 | B67 | B99.5 | 240 |
| 8.8 | Medium Carbon Steel Q+T | M5 to M16 3/16” to 5/8” M18 to M39 11/16” to 1-1/2” |
800 830 |
580 600 |
C22 C23 |
C32 C34 |
640 660 |
| 10.9 | Alloy Steel Q+T | M5 to M39 3/16” to 1-1/2” |
1040 | 830 | C32 | C39 | 940 |
| 12.9 | Alloy Steel Q+T | M1.6 to M39 #0 to 1-1/2” |
1220 | 970 | C39 | C44 | 1100 |
The data on this page is for information only and may be revised without notice. It is believed to be accurate, but HAGUE FASTENERS LIMITED gives no warranty as to its accuracy or completeness, and nothing here guarantees a product for a particular use.
What we make
Carbon steel fasteners and components
Studs and studbolts
Stud bolts, engineer studs, waisted studs and tie bars
Bolts and screws
Hexagon, 12-point, fitted and special head bolts
Nuts
Hex, heavy hex, jam, flange and special nuts
Washers
Plain, machined, spherical and tab washers
Socket screws
Non-standard cap, set, shoulder and countersunk screws
Turned and milled parts
Plugs, pins, bushes and components to drawing
Proving the material
Certified from mill to final release
Every bar comes from an approved UK, EU or US mill with its certificate, and the heat number is carried through to release. Heat treatment, from normalising to quench and temper, stress relief and hydrogen de-embrittlement baking, is carried out by approved partners with furnace charts on request. Independent UKAS-accredited testing and EN 10204 3.1 or 3.2 certificates are supplied as your order requires. See quality and testing.
- Mill certificates and heat traceability
- Quench and temper with furnace charts
- Proof load, wedge, tensile and Charpy impact testing
- Hardness and decarburisation checks
- Zinc flake, zinc nickel and phosphate finishes
Questions
Frequently asked questions
What is the difference between B7 and grade 8.8?
B7 is an ASTM A193 chromium-molybdenum bolting grade for pressure and temperature service; 8.8 is an ISO 898-1 property class for general engineering. B7 is specified by material, 8.8 by minimum properties.
Can you make carbon steel fasteners to a drawing?
Yes. Most of our carbon steel fasteners are made to customer and OEM drawings, in any quantity from one part to several hundred.
Which steel bolts are used for high temperature?
B16 and the Durehete range are the usual choice above the limit of B7. Durehete 1055 is rated for use up to 570°C, as shown in the table above.
Which bolting grade is used for low temperature?
ASTM A320 L7 is the usual alloy steel grade for low temperature service, because it is impact tested at low temperature. Austenitic B8 and B8M are used where colder duty or corrosion resistance is needed.
Do you plate or coat steel bolts?
Yes. Zinc flake, zinc and zinc nickel, phosphate, electroless nickel and PTFE coatings are applied by approved partners and certified batch by batch.
Steel bolting enquiry?
Send us your drawing or specification
Tell us the grade or property class, sizes, quantity and documentation you need, and we will come back to you quickly.