Tanım
150 ksi structural bolting for preloaded steel joints
ASTM F3125 Grade A490 Type 1 Ağır Altıgen Yapısal Cıvatalar
ASTM F3125 Grade A490 Type 1 ağır altıgen yapısal cıvatalar, köprülerdeki yüksek mukavemetli yapısal bağlantılar için ısıl işlem görmüş alaşımlı çelik bağlantı elemanlarıdır, endüstriyel platformlar, binalar ve ağır ekipman çerçeveleri.
Nedir? ASTM F3125 A490 Type 1 heavy hex bolts?
ASTM F3125/F3125M consolidates the principal North American high-strength structural bolting grades. Grade A490 Type 1 identifies quenched-and-tempered alloy or alloy-boron steel bolts with a heavy hex head and a 150 ksi minimum tensile-strength class for inch-series structural applications.
These fasteners are engineered as part of a bolting assembly. The project specification must define the bolt style, çap, uzunluk, iplik, compatible heavy hex nut, hardened washer, installation method and any permitted coating. Substituting a general-purpose hex bolt is not appropriate for a connection designed to the F3125 structural system.
Key procurement advantages
ASTM F3125 Grade A490 Type 1 Heavy Hex Structural Bolts specifications
| Product standard | ASTM F3125/F3125M, ordered edition |
|---|---|
| Seviye / tip / style | Grade A490, Tip 1, heavy hex |
| Malzeme | Quenched-and-tempered alloy steel or alloy-boron steel meeting the ordered specification |
| Strength class | 150 ksi minimum tensile-strength class for the applicable inch-size range |
| Head dimensions | Heavy hex structural bolt dimensions to ASME B18.2.6 when specified |
| Thread system | Unified threads to ASME B1.1 and the ordered F3125 requirements |
| Typical size scope | 1/2 başından sonuna kadar 1-1/2 in. for the A490 heavy hex style, subject to the ordered edition |
| Compatible nut | ASTM A563 Grade DH heavy hex nut or other assembly approved by the project specification |
| Compatible washer | ASTM F436/F436M Tip 1 hardened washer as required by the connection |
| Finish / kaplama | Plain or a coating explicitly permitted by the ordered F3125 edition and approved assembly; do not assume galvanizing |
| Dokümantasyon | EN 10204 3.1 MTC, ısı izlenebilirliği, dimensional report and mechanical-test records as ordered |
Published ranges are procurement guidance, tasarım onayı değil. The purchase order, yönetim kodu, standard edition and approved drawing control final dimensions, properties and acceptance criteria.
How to select this grade
| Seçim noktası | ASTM F3125 Grade A490 Type 1 Ağır Altıgen Yapısal Cıvatalar | When to review another grade |
|---|---|---|
| Primary use | High-strength structural steel joints | Pressure equipment, flanges or general machinery bolting |
| Design basis | ASTM F3125 structural bolt assembly | Use A193, A320, A354 or another service-specific standard |
| Strength level | 150 ksi minimum tensile-strength class | Depends on selected grade and diameter |
| Installation | Preloaded or otherwise installed to the structural connection specification | Torque or installation follows the equipment and joint design |
Matching nuts, washers and coatings
Specify the complete structural assembly. A490 Type 1 bolts are commonly paired with ASTM A563 Grade DH heavy hex nuts and ASTM F436 Tip 1 hardened washers, but the engineer must confirm the exact combination and installation procedure. Coating approval must be based on the ordered standard edition and the complete assembly, with hydrogen-embrittlement risk addressed.
Tipik uygulamalar
| Endüstri | Typical duty | Why this grade is specified |
|---|---|---|
| Bridges | Preloaded steel girder and connection assemblies | High structural strength and controlled installation |
| Industrial structures | Platforms, pipe racks and heavy steel frames | Traceable high-strength bolting system |
| Buildings | Primary structural steel connections | Heavy hex geometry and established structural practice |
| Heavy equipment | Frames and structural modules | High clamp load where the design specifies F3125 A490 |
Application examples do not replace engineering review. Confirm load, sıcaklık, basınç, environment, joint design, installation method and governing code before selection.
Denetleme, test ve dokümantasyon
SASA FLANGE can prepare a project-specific inspection and documentation package. Requirements must be agreed before manufacture so the test frequency, traceability and acceptance criteria are built into the production route.
Heat number and MTC linked to the bolt manufacturing lot.
Tensile, proof-load or wedge testing as required by size and product form.
Head, body, iplik, length and permanent grade marking checked against the order.
Nut, washer, lubrication, coating and rotational-capacity requirements confirmed when applicable.
RFQ and ordering checklist
- ASTM standard, seviye, type and required edition
- Heavy hex dimensional standard or approved drawing
- Çap, overall length and thread length
- Thread series, pitch and class of fit
- Matching nut and washer standards and grades
- Surface finish, kaplama, lubrication and color
- Servis sıcaklığı, environment and design code
- Miktar, işaretleme, packing and delivery destination
- EN 10204 MTC, mechanical, darbe, sertlik, PMI and NDE requirements
- Third-party inspection or project hold points
Sık sorulan sorular
Nedir ASTM F3125 Grade A490 Type 1 heavy hex bolt?
It is a quenched-and-tempered alloy steel structural bolt in the 150 ksi minimum tensile-strength class, supplied in the heavy hex style for engineered steel connections.
Is A490 still a valid designation after ASTM F3125?
Evet. A490 is now a grade within ASTM F3125/F3125M rather than a separate active bolt specification. Purchase documents should reference F3125 and the required A490 type and style.
Which nut and washer are used with A490 Type 1 bolts?
ASTM A563 Grade DH heavy hex nuts and ASTM F436 Tip 1 hardened washers are common. The structural design and ordered standard edition control the final assembly.
Can A490 Type 1 bolts be hot-dip galvanized?
Do not assume galvanizing is acceptable. The coating must be explicitly permitted by the ordered F3125 edition and qualified for the complete assembly, with hydrogen-embrittlement concerns addressed.
What information is needed for an A490 quotation?
Provide the F3125 edition, grade and type, çap, uzunluk, iplik, miktar, nut and washer combination, sona ermek, installation requirements, test documents and delivery destination.
Request a heavy hex bolt quotation
Standardı gönder, seviye, drawing, boyut, assembly, service condition, quantity and documentation requirements for technical review.
