ASTM A194
Grade 8
Stainless Steel Nuts
Why Grade 8 Is the Baseline, Not a Fallback
Grade 8 is plain AISI 304 austenitic stainless, in the standard solution-annealed condition — no low-carbon modification, no strain hardening, no molybdenum addition, no niobium stabilization. It’s the reference point every other stainless grade in the A194 series is measured against, not a lesser option chosen only when nothing else fits.
That baseline status is exactly why it’s the correct choice for a genuinely large share of stainless bolting applications — general corrosion resistance against a wide range of chemical exposure, moderate temperature service, and non-welded or non-critical-weld assemblies rarely need the specific modifications that grades like 8L, 8LN, 8M, or 8A were built to address.
Grade 8 is the direct nut counterpart to ASTM A193 Grade B8 stud bolts — matched mechanical properties, matched base material, and matched thread engagement expectations, making it the natural default pairing whenever B8 studs are specified without a more specific service condition driving a different grade choice.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our Grade 8 nut range is verified by chemical composition and mechanical testing under our ISO 9001:2015 quality system.
Where This Grade Genuinely Applies
Genuine General Corrosion Resistance
304-series stainless resists a wide range of chemical exposure without needing special modification.
Correct Default Pairing With B8 Studs
Matched material and mechanical properties for straightforward assembly compatibility.
Correct Choice for Non-Critical-Weld Assembly
Reliable where weld-decay resistance and chloride resistance aren’t the deciding factor.
Verified Chemical & Mechanical Properties
Batch testing confirms genuine 304 composition and mechanical properties for every lot.
Where Other A194 Stainless Grades Branch From Here
Grade 8 (This Page)
Plain 304, annealed. The starting point every other variation below is measured against.
You Are HereGrade 8LN (304LN Base)
Low carbon for weld-decay resistance, with nitrogen added to recover strength — see our B8LN grade page.
View B8LN Reference → Chloride-Resistant VariantGrade 8MLN (316LN Base)
Adds molybdenum for genuine chloride and pitting resistance — see our B8MLN/B8MLNA grade page.
View B8MLN Reference →Grade 8 vs Grade 8A — Quick Reference
Confirming whether the joint genuinely needs higher strength decides between the annealed and strain-hardened variants. This table is the quick reference we use with buyers before quoting.
| Aspect | Grade 8 (Annealed) | Grade 8A (Strain-Hardened) |
|---|---|---|
| Base Material | AISI 304 | AISI 304, same base |
| Condition | Solution annealed | Strain hardened (cold worked) |
| Relative Strength | Moderate | Higher |
| Typical Use | General corrosion-resistant bolting | Higher-load stainless bolting |
Grade 8 Specification Details
Nominal Composition
- Chromium 18.0 – 20.0%
- Nickel 8.0 – 10.5%
- Carbon ≤0.08%
- Iron Balance
Typical Mechanical Range
- Proof Load Per ASTM A194 Grade 8
- Condition Solution Annealed
- Hardness Standard Annealed Range
- Corrosion Resistance General Purpose
Fastener Types We Manufacture
- Hex Nuts Standard & Heavy Hex
- Jam Nuts Thin Profile
- Matching Studs ASTM A193 Grade B8
- Custom Sizes On Request
Application Areas
Wherever general stainless corrosion resistance is sufficient without a specific service-condition modification.
General Chemical Processing
bolted assemblies
Food & Beverage Equipment
fastening applications
Pharmaceutical Equipment
equipment assembly
General Piping & Flange Bolting
and piping connections
Architectural & Structural Fastening
visible or exposed bolting
Water Treatment Equipment
treatment equipment
General Marine-Adjacent Fastening
corrosion-resistant use
General Stainless Bolting
needing standard 304 corrosion resistance
Standard Export Documentation
Prepared as standard practice for every Grade 8 nut shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Chemical Composition Report
Confirms actual chromium and nickel content fall within the specified 304 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 low-carbon, nitrogen-enhanced variant of the same 304-based family.
View Grade B8LN →ASTM A193 Grade B8MLN / B8MLNA
Our molybdenum-bearing 316LN-based variant, for chloride and marine service.
View B8MLN / B8MLNA →ASTM A194 Grade 6 / 6F
Our heat-treated carbon steel nut grade, for non-stainless general bolting needs.
View Grade 6 / 6F →Stainless Steel Fasteners Manufacturer India
Our broader stainless steel fastener manufacturing capability across all major grades.
View SS Manufacturer Guide →Need the Baseline
Stainless Nut Grade?
Tell us your service condition — we’ll confirm whether Grade 8 genuinely fits or whether a specific variant like 8LN, 8MLN, or 8A serves your application better, 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