ASTM A194
Grade 8LN
Stainless Steel Nuts
Why Grade 8LN Matches Our B8LN Studs
The logic behind Grade 8LN is identical to what we cover in detail on our B8LN stud bolt page — standard 304L already resolves weld decay by dropping carbon to a 0.03% maximum, but that reduction costs a real, measurable amount of room-temperature strength. Nitrogen is added specifically to buy that strength back, through a mechanism separate from carbon entirely, without reintroducing the weld-decay risk the low-carbon composition was meant to fix.
A nut manufactured from an unmatched material grade genuinely risks the bolted joint’s integrity — mismatched carbon content, differing nitrogen levels, or a subtly different mechanical response between stud and nut can affect thread engagement, clamping behavior, and weld-decay resistance at the joint as a whole, not just at each individual component. Ordering Grade 8LN nuts specifically alongside B8LN studs removes that mismatch risk.
That’s exactly why we manufacture and supply this grade as the natural nut pairing for B8LN — same base material, same low-carbon and nitrogen logic, verified together where ordered as a set, and available independently when only the nut side of an assembly needs replacing or supplementing.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade 8LN 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
Low-carbon composition removes chromium carbide precipitation risk during welding.
Strength Advantage Over Plain 304L
Nitrogen addition recovers strength that low carbon alone would otherwise sacrifice.
Correct Default Pairing With B8LN Studs
Matched material and mechanical properties for straightforward assembly compatibility.
Verified Chemical & Mechanical Properties
Batch testing confirms genuine carbon and nitrogen content for the ordered grade.
Choosing Between Related Stainless Nut Grades
Grade 8
Plain 304, standard carbon, annealed. Genuinely sufficient for general, non-weld-critical bolting.
View Grade 8 →Grade 8LN (This Page)
Low-carbon weld-decay resistance with nitrogen-recovered strength — the direct match for B8LN studs.
You Are HereGrade 8M
Adds molybdenum for genuine chloride and pitting resistance, for marine and chloride-bearing service.
View Grade 8M →Grade 8 vs Grade 8LN — Quick Reference
Confirming whether the joint is genuinely weld-critical decides between the standard baseline and the low-carbon/nitrogen variant. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade 8 (304) | Grade 8LN (304LN) |
|---|---|---|
| Carbon Content | ≤0.08% | ≤0.03% |
| Nitrogen Addition | None | Controlled addition |
| Weld-Decay Resistance | Standard | Genuinely improved |
| Best Suited For | Non-weld-critical general bolting | Welded, corrosion-critical bolting |
Grade 8LN 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 Per ASTM A194 Grade 8LN
- Condition Solution Annealed
- Hardness Standard Annealed Range
- Weld-Decay Resistance Genuinely Improved
Fastener Types We Manufacture
- Hex Nuts Standard & Heavy Hex
- Jam Nuts Thin Profile
- Matching Studs ASTM A193 Grade B8LN
- Custom Sizes On Request
Application Areas
Wherever weld-decay resistance and recovered mechanical strength are both genuinely needed.
Welded Chemical Process Equipment
recovered mechanical strength
Cryogenic & LNG Equipment
for low-temperature service
Pharmaceutical Fabricated Assemblies
equipment fastening
Food & Beverage Processing
fastening applications
Fabricated Sheet Metal Structures
both decay resistance and strength
Water & Wastewater Treatment
with strength requirements
Power Plant Piping & Vessels
needing recovered strength
General Welded Corrosion-Resistant Bolting
needing both properties together
Standard Export Documentation
Prepared as standard practice for every Grade 8LN nut shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Chemical Composition Report
Confirms actual carbon and nitrogen content fall within the specified 8LN grade range.
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 B8LN
Our direct matching stud bolt for this same 304LN, low-carbon, nitrogen-enhanced family.
View Grade B8LN Studs →ASTM A194 Grade 8
Our annealed baseline stainless nut grade, without the low-carbon and nitrogen modifications.
View Grade 8 →ASTM A193 Grade B8MLN / B8MLNA
Our molybdenum-bearing 316LN-based variant, for chloride and marine service.
View B8MLN / B8MLNA →Stainless Steel Fasteners Manufacturer India
Our broader stainless steel fastener manufacturing capability across all major grades.
View SS Manufacturer Guide →Weld-Decay Resistance,
Without the Strength Penalty
Tell us your welding and strength requirements — we’ll confirm whether Grade 8LN genuinely fits, matched with our B8LN studs or supplied independently, 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