ASTM A194
Grade 1
Carbon Steel Hex Nuts
Why Grade 1 Covers So Much Ground
Grade 1 is deliberately the simplest nut grade in the ASTM A194 specification — plain carbon steel, without the alloy additions, corrosion-resisting elements, or specialized heat treatments found in higher grades. That simplicity is precisely the point: the vast majority of bolted joints in general construction, machinery, and equipment don’t operate at high temperature, in corrosive environments, or under unusually high loads, and don’t need to pay for properties they’ll never use.
What Grade 1 does deliver reliably is consistent medium-range mechanical strength at a cost structure that makes it the practical default for high-volume, price-sensitive applications — general fabrication, machinery assembly, non-critical structural connections, and any bolted joint where ambient temperature and non-corrosive service are the norm.
Grade 1 is commonly specified alongside lower and medium-strength bolts such as ASTM A307 or SAE Grade 2 — a matched, cost-effective pairing rather than an over-specified one, since pairing a basic nut with an unnecessarily high-strength bolt (or vice versa) wastes cost without adding real joint performance.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade 1 nut range is manufactured and tested under our ISO 9001:2015 quality system, with full documentation on every shipment regardless of order size.
Where This Grade Genuinely Applies
Genuine Cost Efficiency
Plain carbon steel, no unnecessary alloying — the most economical nut grade in the A194 specification.
Dependable Medium Strength
Consistent mechanical properties across every batch, suited to general and non-critical bolting.
Matched Pairing With Common Bolts
Correct default counterpart for A307 and SAE Grade 2 bolting in general applications.
High-Volume Manufacturing Ready
Straightforward material and process makes Grade 1 efficient to produce at large order volumes.
Choosing Between Related Carbon & Alloy Steel Grades
Grade 1 (This Page)
Plain carbon steel, no alloy additions — the most economical, general-purpose choice in the specification.
You Are HereGrade 2
Carbon or alloy steel, quenched and tempered for higher strength — matched to ASTM A193 Grade B7 studs.
View Grade 2 → Alloy Steel, Heavy Hex, High StrengthGrade 2H
Heavy hex, higher-hardness carbon steel nut, one of the most widely specified industrial nut grades.
View Grade 2H →Grade 1 vs Grade 2 — Quick Reference
Confirming whether the joint genuinely needs higher strength before paying for a heat-treated alloy grade. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade 1 | Grade 2 |
|---|---|---|
| Base Material | Plain carbon steel | Carbon or alloy steel |
| Heat Treatment | None required | Quenched and tempered |
| Relative Strength | Medium, general purpose | Higher, structural-grade |
| Typical Matching Bolt | A307, SAE Grade 2 | ASTM A193 Grade B7 |
Grade 1 Specification Details
Nominal Composition
- Carbon Low to Medium
- Manganese Standard Range
- Sulfur/Phosphorus Controlled Limits
- Alloying Elements None Required
Typical Mechanical Range
- Proof Load Per ASTM A194 Grade 1
- Condition Hot-Forged, As Supplied
- Hardness General-Purpose Range
- Heat Treatment Not Required
Fastener Types We Manufacture
- Hex Nuts Standard & Heavy Hex
- Jam Nuts Thin Profile
- Coating Options Zinc, Black Oxide, Plain
- Custom Sizes On Request
Application Areas
Wherever ambient temperature, non-corrosive service, and general-purpose strength requirements are the norm.
General Structural Fabrication
connections, indoor use
General Machinery Assembly
ambient temperature
Agricultural & Industrial Equipment
volume production use
General Piping & Duct Support
corrosive support bolting
Standard Export Documentation
Prepared as standard practice for every Grade 1 nut shipment, regardless of order size.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Dimensional Inspection Report
Confirms thread pitch, across-flats dimension, and thickness conform to ASME B18.2.2.
Certificate of Conformance
Confirms the shipment matches the purchase order grade/size specification in full.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
Coating/Finish Report
Confirms coating thickness and type for zinc-plated or coated finish options.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
ASTM A194 Grade 2
Our quenched-and-tempered alloy steel grade, for applications needing higher strength than Grade 1 provides.
View Grade 2 →ASTM A194 Grade 2H
Our heavy hex, high-hardness carbon steel grade — one of the most widely specified industrial nut grades.
View Grade 2H →ASTM A194 Grade 8
Our stainless steel baseline, for applications needing corrosion resistance beyond carbon steel.
View Grade 8 →Stainless Steel Fasteners Manufacturer India
Our broader fastener manufacturing capability across all major carbon, alloy, and stainless grades.
View SS Manufacturer Guide →General-Purpose Nuts,
Reliable Every Batch
Tell us your size range and quantity requirements — we’ll confirm manufacturability and quote with full documentation. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in