ASTM A194 GRADE 8A NUTS
ASTM A194 Grade 8A Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Austenitic Stainless Steel Heavy Hex Nuts (ASTM A194 Grade 8A). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 8A MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for highly corrosion-resistant, austenitic stainless steel nuts. The "A" suffix guarantees the material has been fully solution annealed after all manufacturing operations.
- Full Traceability: Certified with TC No.: S310/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the Chromium-Nickel (18/8) chemistry of AISI Type 304 stainless steel, which grants this grade its excellent resistance to general oxidation and localized corrosion.
- Hardness Verification: Specifically tracks the stringent maximum hardness limit (192 HBW / 90 HRB) mandated for the "A" designation, proving the removal of cold-working stresses.
- Heat Treatment Tracking: Verifies the essential Carbide Solution Treatment (Solution Annealing) at a minimum of 1900°F (1040°C) performed after threading and machining, followed by a rapid water quench.
- Quality Compliance: 100% visual and dimensional inspection carried out to guarantee perfectly formed threads and flat bearing surfaces in accordance with ASME B18.2.2.
Live Preview: ASTM A194 Grade 8A Data
Review the standard parameters and layout before downloading the full document.
TC Number
S310/26-XX
TC Date
18.12.20XX
Material Spec
ASTM A194 GRADE 8A
Nut Shape / Size
Heavy Hex Nut / M24
Dimensions / Item
Heavy Hex Nut M24-3.0P
Quantity
250.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.04 | 1.45 | 0.025 | 0.010 | 0.40 | 18.50 | 8.20 |
| Max: 0.08 | Max: 2.00 | Max: 0.045 | Max: 0.030 | Max: 1.00 | Min: 18.00 Max: 20.00 |
Min: 8.00 Max: 10.50 |
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) |
|---|---|
| 560.20 | 145, 142, 148 |
| Min: 550 | Min: 126 Max: 192 (90 HRB) |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for high-temperature and highly corrosive pipeline fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 8A with respect to the tests carried out, specifically ensuring final stage heat treatments.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Safety Requirements | Material is free from radioactive contamination. |
| Weld Repairs | No weld repair performed. |
| Dimensional Accuracy | All dimensions, threads, and bearing surface tolerances conform to ASME B18.2.2. |
Certification Details
We confirm that above mentioned Items was Manufactured, Sampled, Tested and Inspected in accordance with the subjected Customer's Purchase Order and as applicable Drawings, Material Specifications, Codes & Standards and the results of the items have been determined to meet the users' requirements.
Documentation Standard
- EN 10204-2004: 3.1 Standard
- Free from radioactive contamination
- Certified ISO 9001: 2015 Company
Heat Treatments
- Carbide Solution Treated (Annealed)
- Treatment applied after all machining
- Quenching: Rapid Water Quench
Testing Conditions
- Proof load & hardness testing carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — ASTM A194 Grade 8A MTC Certificate
What does the "A" in Grade 8A signify?
While both Grade 8 and Grade 8A are made from AISI 304 stainless steel, the "A" suffix indicates that the nuts have been Carbide Solution Treated (fully annealed) after all forming, threading, and machining operations are complete. Standard Grade 8 nuts may retain some work-hardening from the manufacturing process, allowing a higher hardness (up to 321 HBW). Grade 8A is dead-soft (maximum 192 HBW / 90 HRB).
Why choose Grade 8A over standard Grade 8?
The cold-working process used to form threads and shapes in standard Grade 8 leaves residual stresses in the metal. In certain harsh chemical or highly corrosive environments, these residual stresses make the nut susceptible to Stress-Corrosion Cracking (SCC). The final solution anneal mandated by the Grade 8A specification removes these stresses, optimizing the alloy for maximum corrosion resistance and dimensional stability.
Are Grade 8 and 8A chemically different?
No, the chemical composition requirements for ASTM A194 Grade 8 and Grade 8A are identical. Both are Austenitic Type 304 Stainless Steel (18% Cr, 8% Ni). The distinction lies entirely in the final heat treatment and the resulting mechanical hardness.