ASTM A194
Grade 8LNA
Strain-Hardened Nuts
Why 8LNA Stacks Both Benefits
Grade 8LNA is the strain-hardened version of the same B8LN/B8LNA logic we cover on our stud bolt page — low carbon for genuine weld-decay resistance, nitrogen to recover the strength that low carbon alone would sacrifice, and now cold working on top of both for a further, genuinely additive strength gain.
None of these elements interfere with each other — low carbon and nitrogen work together as a matched strengthening pair independent of any mechanical process, and cold working is a mechanical process applied after annealing that raises strength regardless of the underlying chemistry. Stacking all three gives 8LNA the highest proof load available in our 304LN-based branch of stainless nuts.
That makes 8LNA the correct choice specifically when both conditions are genuinely present together — a real weld-critical assembly at risk of sensitization, and a higher-load joint than plain annealed 304LN comfortably supports. It follows the identical combined-benefits pattern already established across our Grade 8MLNA and 8CLNA pages, just applied to the 304LN base rather than 316LN or 347LN.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade 8LNA nut range is verified by chemical composition and mechanical testing under our ISO 9001:2015 quality system.
Where This Grade Genuinely Applies
Genuine Weld-Decay Resistance, Retained
Low-carbon composition unaffected by cold working, delivering the same protection as Grade 8LN.
Genuine Strength Gain Added
Cold working delivers a further, real work-hardening effect on top of nitrogen-recovered strength.
Highest Proof Load in the 304LN Branch
Reliable where weld-critical service and elevated mechanical load are both genuinely present.
Verified Mechanical Properties
Batch testing confirms genuine cold-worked strength and full composition for every lot.
Choosing Between Related 304LN Nut Grades
Grade 8
Plain 304, standard carbon, annealed. Genuinely sufficient for general, non-weld-critical bolting.
View Grade 8 → 304LN Base, AnnealedGrade 8LN
Same weld-decay and nitrogen-recovered strength combination as this page, without cold working.
View Grade 8LN →Grade 8LNA (This Page)
Low-carbon weld-decay resistance, nitrogen strength recovery, and cold working — all genuinely combined.
You Are HereGrade 8LN vs Grade 8LNA — 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 8LN (Annealed) | Grade 8LNA (Strain-Hardened) |
|---|---|---|
| Base Material | AISI 304LN | AISI 304LN, identical composition |
| Process | Solution annealed only | Solution annealed, then cold worked |
| Relative Strength | Moderate, nitrogen-recovered | Highest in the 304LN branch |
| Weld-Decay Resistance | Genuine, established | Identical to Grade 8LN |
Grade 8LNA Specification Details
Nominal Composition
- Chromium 18.0 – 20.0%
- Nickel 8.0 – 10.5%
- Carbon ≤0.03%
- Nitrogen 0.10 – 0.16%
Typical Mechanical Range
- Proof Load Highest in 304LN Branch
- Condition Strain Hardened
- Hardness Elevated Cold-Worked Range
- Weld-Decay Resistance Same as Grade 8LN
Fastener Types We Manufacture
- Hex Nuts Standard & Heavy Hex
- Jam Nuts Thin Profile
- Matching Studs ASTM A193 Grade B8LNA
- Custom Sizes On Request
Application Areas
Wherever weld-critical service and elevated mechanical load are both genuinely present together.
High-Load Welded Process Equipment
genuine strength requirements
Cryogenic & LNG High-Load Equipment
for demanding low-temperature service
Pharmaceutical High-Load Fabricated Assemblies
with elevated strength needs
Higher-Load Water Treatment Equipment
with real strength demands
Standard Export Documentation
Prepared as standard practice for every Grade 8LNA nut shipment.
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 8LNA proof load requirement.
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.
NABL Accredited Test Reports
Independent mechanical, dimensional, and corrosion testing available on request.
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 8LN
Our annealed baseline variant of the same 304LN base material, without cold working.
View Grade 8LN →ASTM A194 Grade 8MLNA
The same combined-benefits pattern applied to 316LN’s molybdenum instead of 304LN’s simpler base.
View Grade 8MLNA →ASTM A194 Grade 8CLNA
The same combined-benefits pattern applied to 347LN’s niobium stabilization instead.
View Grade 8CLNA →Stainless Steel Fasteners Manufacturer India
Our broader stainless steel fastener manufacturing capability across all major grades.
View SS Manufacturer Guide →Weld-Decay Resistance
Plus Higher Load?
Tell us your welding requirements and strength demands — we’ll confirm whether Grade 8LNA genuinely needs both benefits, matched with our B8LNA studs, 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