ASTM A194
Grade 8MLNA
Strain-Hardened Nuts
Why 8MLNA Stacks Three Properties
Grade 8MLNA is the strain-hardened version of the same B8MLN/B8MLNA logic we cover on our stud bolt page — molybdenum for chloride and pitting resistance, low carbon for weld-decay resistance, nitrogen to recover the strength that low carbon alone would sacrifice, and now cold working on top of all three for a further, genuinely additive strength gain.
None of these four elements interfere with each other — molybdenum is a composition-level addition independent of carbon content; low carbon and nitrogen work together as a matched pair to solve weld decay without a strength penalty; and cold working is a mechanical process applied after annealing that raises strength regardless of the underlying chemistry. Stacking all of them gives 8MLNA the highest proof load available in the entire 316LN-based branch of our stainless nut range.
That makes 8MLNA the correct choice specifically when all three conditions are genuinely present together — real chloride exposure, a genuinely weld-critical assembly, and a higher-load joint than plain annealed 316LN comfortably supports. It’s a specialized, high-capability grade, and it earns that specialization honestly through three real, independently verifiable properties rather than marketing.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade 8MLNA nut range is verified by chemical composition and mechanical testing under our ISO 9001:2015 quality system.
Where This Grade Genuinely Applies
Genuine Chloride Resistance, Retained
Molybdenum content unaffected by cold working, delivering the same pitting resistance as 8MLN.
Genuine Weld-Decay Resistance, Retained
Low-carbon composition unaffected by strain hardening, preserving weld-critical performance.
Highest Proof Load in the 316LN Branch
Cold working adds a further, genuinely additive strength gain on top of nitrogen-recovered strength.
Verified Mechanical Properties
Batch testing confirms genuine cold-worked strength and full composition for every lot.
Choosing Between Related 316LN Nut Grades
Grade 8M
Genuine chloride resistance from molybdenum alone, without the low-carbon or nitrogen additions.
View Grade 8M → 316LN Base, AnnealedGrade 8MLN
Same three-property combination as this page, without the added strength from cold working.
View B8MLN Reference →Grade 8MLNA (This Page)
Molybdenum, low-carbon, nitrogen, and cold working — all four genuinely combined for maximum capability.
You Are HereGrade 8MLN vs Grade 8MLNA — 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 8MLN (Annealed) | Grade 8MLNA (Strain-Hardened) |
|---|---|---|
| Base Material | AISI 316LN | AISI 316LN, identical composition |
| Process | Solution annealed only | Solution annealed, then cold worked |
| Relative Strength | Moderate, nitrogen-recovered | Highest in the 316LN branch |
| Chloride & Weld-Decay Resistance | Genuine, established | Identical to Grade 8MLN |
Grade 8MLNA Specification Details
Nominal Composition
- Chromium 16.0 – 18.0%
- Nickel 10.0 – 14.0%
- Molybdenum 2.0 – 3.0%
- Carbon ≤0.03%
Typical Mechanical Range
- Nitrogen Controlled Addition
- Condition Strain Hardened
- Proof Load Highest in 316LN Branch
- Chloride/Weld Resistance Same as Grade 8MLN
Fastener Types We Manufacture
- Hex Nuts Standard & Heavy Hex
- Jam Nuts Thin Profile
- Matching Studs ASTM A193 Grade B8MLNA
- Custom Sizes On Request
Application Areas
Wherever chloride exposure, weld-critical assembly, and elevated mechanical load are all genuinely present together.
High-Load Welded Marine Structures
strength all genuinely required
Offshore Welded Pressure Vessels
chloride-resistant flange bolting
LNG & Cryogenic Welded Equipment
at genuine higher load
Desalination High-Load Process Equipment
equipment with strength demands
Standard Export Documentation
Prepared as standard practice for every Grade 8MLNA 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 8MLNA 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 A193 Grade B8MLN / B8MLNA
Our direct matching stud bolt family for this same 316LN, three-property combination.
View B8MLN / B8MLNA Studs →ASTM A194 Grade 8LN
Our low-carbon, nitrogen-enhanced 304LN-based grade, without molybdenum’s chloride resistance.
View Grade 8LN →ASTM A194 Grade 8M
Our plain 316-based grade, chloride resistance alone without the weld-decay or strength additions.
View Grade 8M →Stainless Steel Fasteners Manufacturer India
Our broader stainless steel fastener manufacturing capability across all major grades.
View SS Manufacturer Guide →Chloride, Weld Decay,
and Strength — All Three?
Tell us your service environment, welding requirements, and load demands — we’ll confirm whether Grade 8MLNA genuinely needs all three properties, matched with our B8MLNA 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