ASTM A563 Carbon Steel Nuts are high-quality carbon and alloy steel nuts designed for use with bolts, studs, and other externally threaded fasteners in structural and mechanical applications. Manufactured according to ASTM A563 / ASME SA563, these nuts are available in different grades to meet requirements for general fastening, high-strength structural connections, and atmospheric corrosion-resistant applications.
We manufacture and supply ASTM A563 Nuts in hex, heavy hex, and other configurations, with dimensions commonly manufactured to ASME B18.2.2. Depending on the grade, these nuts can provide high proof-load strength, controlled hardness, and reliable performance in demanding bolted assemblies.
Our range includes ASTM A563 Grade A Nuts, ASTM A563 Grade B Nuts, ASTM A563 Grade C Heavy Hex Nuts, ASTM A563 Grade D Nuts, ASTM A563 Grade DH Heavy Hex Structural Nuts, and ASTM A563 Grade DH3 Corrosion Resistant Weathering Nuts.
What Are ASTM A563 Carbon Steel Nuts?
ASTM A563 Carbon Steel Nuts are carbon and alloy steel nuts manufactured to ASTM A563 requirements for general structural and mechanical applications. They are available in grades such as A, B, C, D, DH, C3 and DH3, with different strength, hardness, material and corrosion-resistance requirements. Grade DH is commonly used for high-strength structural bolting, while DH3 is intended for atmospheric corrosion-resistant applications.
Table of Contents
- ➤ What Are ASTM A563 Carbon Steel Nuts?
- ➤ ASTM A563 Nuts Types and Grades
- ➤ ASTM A563 Carbon Steel Nuts Specifications
- ➤ ASTM A563 Carbon Steel Nuts Chemical Composition
- ➤ ASTM A563 Nuts Mechanical Properties
- ➤ ASTM A563 Nuts Dimensions and Standards
- ➤ ASTM A563 Nuts Weight Chart
- ➤ ASTM A563 Equivalent Grades Chart
- ➤ ASTM A563 Carbon Steel Nuts Manufacturing Process
- ➤ ASTM A563 Nuts Surface Finishes
- ➤ ASTM A563 Carbon Steel Nuts Applications
- ➤ Why Choose Us for ASTM A563 Carbon Steel Nuts?
- ➤ ASTM A563 Nuts Supplier in India
ASTM A563 Nuts Types and Grades
ASTM A563 covers multiple nut grades, allowing the nut to be selected according to the bolt grade, strength requirement, size and service environment. The principal grades include O, A, B, C, C3, D, DH and DH3.
ASTM A563 Grade A Nuts
Grade A nuts are low-carbon steel nuts intended for general fastening applications. They are available in hex and heavy hex configurations and are commonly used with lower-strength structural and anchor-bolt assemblies.
ASTM A563 Grade B Nuts
ASTM A563 Grade B Nuts provide higher strength than Grade A and are available in hex and heavy hex styles. They are suitable for applications requiring greater load-carrying capability.
ASTM A563 Grade C Heavy Hex Nuts
Grade C nuts are medium-carbon steel nuts and are generally supplied as heavy hex nuts. They are suitable for higher-strength structural applications where increased proof-load capability is required.
ASTM A563 Grade D Nuts
Grade D is a higher-strength carbon steel grade that may be quenched and tempered. It is supplied primarily in heavy hex form for demanding mechanical and structural applications.
ASTM A563 Grade DH Heavy Hex Structural Nuts
ASTM A563 Grade DH Heavy Hex Structural Nuts are quenched-and-tempered high-strength nuts designed for structural bolting applications. Grade DH offers a minimum proof load of approximately 175 ksi for the applicable coarse-thread heavy hex configuration.
ASTM A563 Grade DH3 Corrosion Resistant Weathering Nuts
ASTM A563 Grade DH3 Corrosion Resistant Weathering Nuts are high-strength atmospheric corrosion-resistant nuts. Grade DH3 is intended for applications where weathering-steel characteristics are required, including exposed structural connections. ASTM states that DH3 has atmospheric corrosion resistance and weathering characteristics comparable to weathering steels covered by A242/A242M, A588/A588M and A709/A709M.
ASTM A563 Carbon Steel Nuts Specifications
| Property | Details |
|---|---|
| Product | Carbon Steel Nuts |
| Standard | ASTM A563 / ASME SA563 |
| Nut Types | Hex, Heavy Hex, Structural Heavy Hex |
| Grades | A, B, C, DH, DH3 |
| Dimensions | ASME B18.2.2 |
| Thread | UNC, UNF and project-specific |
| Manufacturing | Cold Forged / Hot Forged / Machined, as applicable |
| Surface Finish | Plain, Zinc Plated, Hot Dip Galvanized and other options |
| Application | Construction, structural, industrial, machinery and infrastructure |
ASTM A563 Carbon Steel Nuts Chemical Composition
| Element | Grades O, A, B & C | Grade D | Grade DH |
|---|---|---|---|
| Carbon, C | 0.55% max | 0.55% max | 0.20–0.55% |
| Manganese, Mn | — | 0.30% min | 0.60% min |
| Phosphorus, P | 0.12% max | 0.04% max | 0.04% max |
| Sulfur, S | 0.15% max* | 0.05% max | 0.05% max |
ASTM A563 Nuts Mechanical Properties
| Grade | Nut Style | Approx. Size Range | Minimum Proof Load, Plain* | Hardness Range |
|---|---|---|---|---|
| A | Hex | 1/4–1-1/2 in | 90 ksi | 116–302 HB |
| A | Heavy Hex | 1/4–4 in | 100 ksi | 116–302 HB |
| B | Heavy Hex | 1/4–1-1/2 in | 105–120 ksi** | 121–302 HB |
| C | Heavy Hex | 1/4–4 in | 144 ksi | 143–352 HB |
| D | Heavy Hex | 1/4–4 in | 150 ksi | 248–352 HB |
| DH | Heavy Hex | 1/4–4 in | 175 ksi | 248–352 HB |
| DH3 | Heavy Hex | 1/4–4 in | 175 ksi | 248–352 HB |
ASTM A563 Nuts Dimensions and Standards
The dimensional requirements for ASME B18.2.2 ASTM A563 Nuts cover common inch-series hex and heavy hex nut configurations. Heavy hex nuts have greater width across flats and thickness than standard finished hex nuts, providing a larger bearing surface for structural applications.
We can supply nuts according to the required dimensional standard, thread form, nominal diameter, nut style and customer drawing.
Common dimensional and manufacturing standards include:
- ASTM A563 / A563M – Material and performance requirements
- ASME SA563 – ASME-listed equivalent specification
- ASME B18.2.2 – Inch-series square and hex nut dimensions
- ASME B1.1 – Unified inch screw threads
- Customer drawings and project specifications
ASTM A563 Nuts Weight Chart
| Nominal Size | Approx. Weight / 100 Nos. |
|---|---|
| 1/2" | 6.54 lb / 2.97 kg |
| 5/8" | 11.90 lb / 5.40 kg |
| 3/4" | 19.30 lb / 8.75 kg |
| 7/8" | 29.70 lb / 13.47 kg |
| 1" | 42.50 lb / 19.28 kg |
| 1-1/8" | 59.20 lb / 26.85 kg |
| 1-1/4" | 78.60 lb / 35.65 kg |
| 1-3/8" | Approx. 102 lb / 46.27 kg |
| 1-1/2" | Approx. 131 lb / 59.42 kg |
| 1-3/4" | Approx. 204 lb / 92.53 kg |
| 2" | Approx. 299 lb / 135.62 kg |
ASTM A563 Equivalent Grades Chart
| ASTM A563 Grade | Commonly Associated Fastener / Application |
|---|---|
| Grade A | A307 / F1554 Grade 36 & 55 applications |
| Grade B | A307 Grade B / A449 applications |
| Grade C | Higher-strength structural applications |
| Grade D | A449 / A354 BC type applications |
| Grade DH | High-strength structural bolting |
| Grade C3 | Weathering structural applications |
| Grade DH3 | High-strength weathering structural applications |
| ASME SA563 | ASME designation for ASTM A563 material |
ASTM A563 Carbon Steel Nuts Manufacturing Process
ASTM A563 Nuts Surface Finishes
Depending on the application and project requirements, ASTM A563 nuts can be supplied in different finishes, including:
- Plain / black finish
- Zinc plated
- Hot-dip galvanized
- Mechanical galvanized
- Other customer-specified protective coatings
For galvanized assemblies, thread dimensions and overtapping requirements should be considered so that the finished nut properly engages with the mating bolt.
ASTM A563 Carbon Steel Nuts Applications
ASTM A563 nuts are used where reliable threaded fastening and appropriate mechanical strength are required. Typical applications include:
- Structural steel fabrication
- Steel bridges and infrastructure
- Construction projects
- Industrial equipment
- Machinery and mechanical assemblies
- Anchor-bolt connections
- Towers and heavy structures
- Transportation infrastructure
- Outdoor structural connections
- Weathering-steel structures
- General engineering applications
Grade DH and DH3 are particularly relevant to high-strength structural connections, while Grade DH3 is selected when atmospheric corrosion resistance and weathering characteristics are required.
Why Choose Us for ASTM A563 Carbon Steel Nuts?
We supply ASTM A563 Carbon Steel Nuts with attention to material grade, dimensions, thread accuracy and application requirements. Our focus is on providing fasteners that match the required specification rather than simply supplying a generic carbon steel nut.
What We Offer
- ASTM A563 Grade A, B, C, D, DH and DH3 nuts
- Heavy hex structural nuts
- Weathering-steel DH3 nuts
- Inch and metric requirements as applicable
- ASME B18.2.2 dimensional compliance
- Plain and coated finishes
- Bulk and project quantities
- Mill test certificates and inspection documentation
- Third-party inspection support when required
- Customized packaging and marking
- Export-oriented supply
ASTM A563 Nuts Supplier in India
As an ASTM A563 Nuts Supplier in India, we support manufacturers, fabricators, EPC contractors, construction companies and industrial buyers with specification-based nut requirements.
Whether you require ASTM A563 Grade A Nuts for general fastening, Grade C Heavy Hex Nuts for structural applications, ASTM A563 Grade DH Heavy Hex Structural Nuts for high-strength bolting, or Grade DH3 weathering nuts for exposed structures, we can help you select and source the appropriate grade.
For a quotation, share the ASTM grade, nut style, nominal diameter, thread specification, quantity, finish and delivery requirement with our team.
ASTM A563 Carbon Steel Nuts FAQs
Request a Quote for ASTM A563 Carbon Steel Nuts
