ASTM A194
Grade 8P
Stainless Steel Nuts
Why Nitrogen, Not Cold Working
Our Grade 8A and 8MA pages cover strain hardening — cold working an annealed nut to raise strength through a mechanical process. Grade 8P reaches higher strength through a genuinely different route: nitrogen alloying, the same strengthening principle behind the LN grade family we cover elsewhere on this site, where nitrogen increases strength in austenitic stainless through a mechanism separate from carbon or mechanical deformation entirely.
That distinction matters practically — a nitrogen-strengthened grade stays in a solution-annealed condition rather than being cold worked, which can matter for applications where the specific microstructural state of a strain-hardened part isn’t desired, or where the governing specification calls for annealed condition with elevated proof load specifically.
Grade 8P is a genuinely less common designation than our core Grade 8/8M/8C family, and while the nitrogen-strengthening principle is solid and well-established, we recommend confirming the exact base alloy composition and proof-load requirement against the current ASTM A194 standard text or your project specification before finalizing an order — this level of specificity is exactly where the governing document, not a general description, should be the final word.
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 8P is a considerably less commonly specified designation than our core Grade 8, 8M, and 8C family, and published, detailed reference material on its precise base alloy and proof-load requirements is genuinely more limited than for those widely used grades. 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 Strength Without Cold Working
Nitrogen alloying raises proof load while keeping the part in a solution-annealed condition.
Correct Default Pairing With B8P 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.
Cold Working vs Nitrogen Strengthening
Grade 8A
Higher strength through cold working, a mechanical deformation process applied after annealing.
View Grade 8A →Grade 8P (This Page)
Higher strength through nitrogen alloying, a composition-level change staying in solution-annealed condition.
You Are HereGrade 8LN
Nitrogen strengthening combined with low carbon for weld-decay resistance — see our B8LN grade page.
View B8LN Reference →Grade 8P Specification Approach
Shared Elements With Related Grades
- Base Type Austenitic Stainless
- Nitrogen Deliberate Strengthening Addition
- Condition Solution Annealed
- Chromium/Nickel Per Governing Standard
What Makes This Grade Different
- Proof Load Higher Than Grade 8, Confirmed Per Order
- Strengthening Mechanism Nitrogen, Not Cold Working
- Matching Bolt ASTM A193 Grade B8P
- Mechanical Properties Confirmed Per Order
Our Order Process for Grade 8P
- Step 1 Confirm Governing Document
- Step 2 Verify Composition Limits
- Step 3 Manufacture & Test to Spec
- Step 4 Issue Full Documentation
Application Context
Wherever higher proof load is needed without cold-worked microstructure, typically driven by a specific project standard.
Demanding Bolted Joints
strain-hardened microstructure
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.
Chemical Composition Report
Confirms actual nitrogen content and base alloy composition against your confirmed specification.
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 8A
Our strain-hardened alternative route to higher strength, via cold working instead of nitrogen.
View Grade 8A →ASTM A193 Grade B8LN
Our related nitrogen-strengthened, low-carbon grade for weld-critical service.
View Grade B8LN →ASTM A194 Grade 8
Our annealed baseline stainless nut grade, without the elevated proof load of Grade 8P.
View Grade 8 →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