ASTM A194
Grade 8NA
Strain-Hardened Nuts
Why 8NA Stacks Two Strategies Together
Nitrogen alloying and cold working raise strength through genuinely independent mechanisms — nitrogen is a composition-level addition, cold working is a mechanical process applied after annealing, and neither interferes with the other. That’s the same principle behind our Grade 8MA and 8TA pages, where a corrosion-focused composition change (molybdenum, titanium) stacks cleanly with strain hardening. Grade 8NA follows the identical logic, with nitrogen’s strength-focused role standing in for those corrosion-focused elements.
That makes 8NA the highest proof-load option in this specific line of grades — nitrogen alloying provides one increment of strength above plain Grade 8, and cold working adds a further, genuinely additive increment on top of that, without requiring either a different base alloy or accepting the trade-offs that come with grades like 8F.
Because Grade 8N itself is a genuinely less common designation, and 8NA is its strain-hardened derivative, we recommend confirming the exact base alloy and proof-load requirement against the current ASTM A194 standard text or your project specification before finalizing an order — the same caution that applies to our Grade 8N and 8P pages applies here as well.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and we’re glad to manufacture to this specification once the exact composition and property requirements are confirmed, verified under our ISO 9001:2015 quality system.
An Honest Note on This Specific Grade
Grade 8NA inherits the same specificity as its Grade 8N baseline — a considerably less commonly specified designation than our core Grade 8, 8M, and 8C family, with limited published reference material on its precise base alloy. We manufacture to this specification when a customer provides the exact composition and property requirements — either from the current ASTM A194 standard text or a project-specific data sheet — rather than relying on general description alone. If you’re specifying this grade, please share the governing document with your inquiry so we can confirm manufacturability accurately.
Where This Grade Genuinely Applies
Genuine Combined Strength
Nitrogen and cold working stack additively, giving the highest proof load in this specific grade line.
Correct Default Pairing With B8NA Studs
Matched material and mechanical properties for straightforward assembly compatibility.
Project-Specific Specification
Typically called out by name on a specific project drawing or governing specification.
Verified Against Your Governing Document
We manufacture to the composition and property requirements you provide, confirmed before production.
Choosing Between Related Nitrogen-Strengthened Grades
Grade 8N
Same nitrogen-alloyed base as this page, without the added strength from cold working.
View Grade 8N →Grade 8NA (This Page)
Grade 8N’s nitrogen alloying plus cold working’s strain hardening — both benefits genuinely combined.
You Are HereGrade 8MA
The same combined-benefits pattern applied to 316’s molybdenum instead of nitrogen alone.
View Grade 8MA →Grade 8N vs Grade 8NA — Quick Reference
Confirming whether the joint genuinely needs the highest available proof load before paying for the cold-worked variant. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade 8N (Annealed) | Grade 8NA (Strain-Hardened) |
|---|---|---|
| Base Composition | Nitrogen-alloyed austenitic stainless | Identical composition |
| Process | Solution annealed only | Solution annealed, then cold worked |
| Relative Strength | Higher than plain Grade 8 | Highest in this grade line |
| Typical Use | Demanding bolted joints | Most demanding bolted joints |
Grade 8NA Specification Approach
Shared Elements With Grade 8N
- Base Type Austenitic Stainless
- Nitrogen Deliberate Strengthening Addition
- Chromium/Nickel Per Governing Standard
- Composition Identical to Grade 8N
What Makes This Grade Different
- Condition Strain Hardened
- Proof Load Higher Than Grade 8N, Confirmed Per Order
- Matching Bolt ASTM A193 Grade B8NA
- Mechanical Properties Confirmed Per Order
Our Order Process for Grade 8NA
- Step 1 Confirm Governing Document
- Step 2 Verify Composition Limits
- Step 3 Manufacture & Test to Spec
- Step 4 Issue Full Documentation
Application Context
Wherever the highest available proof load in this grade line is genuinely required, typically driven by a specific project standard.
Most Demanding Bolted Joints
this nitrogen-strengthened line
High-Value Custom Fabrication
tied to a governing standard
Engineering-Specified Critical Bolting
is dictated by design engineering
Power & Energy Infrastructure Projects
standards and specifications
Standard Export Documentation
Prepared as standard practice once composition and property requirements are confirmed for your order.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Mechanical Property Report
Confirms actual cold-worked strength meets the specified Grade 8NA proof load requirement.
Certificate of Conformance
Confirms the shipment matches the purchase order specification in full.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical and chemical testing available on request for critical applications.
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 8N
Our annealed baseline variant of the same base material, without cold working.
View Grade 8N →ASTM A194 Grade 8MA
The same combined-benefits pattern applied to 316’s molybdenum instead of nitrogen alone.
View Grade 8MA →ASTM A194 Grade 8P
Our other nitrogen-strengthened specialty grade, precise distinction confirmed against the standard.
View Grade 8P →Stainless Steel Fasteners Manufacturer India
Our broader stainless steel fastener manufacturing capability across all major grades.
View SS Manufacturer Guide →Have the Governing
Specification for This Grade?
Share your project standard or the ASTM A194 edition you’re working to, and we’ll confirm manufacturability, composition, and mechanical property alignment before quoting. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in