ASTM A194 GRADE 8F NUTS
ASTM A194 Grade 8F Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Free-Machining Austenitic Stainless Steel Heavy Hex Nuts (ASTM A194 Grade 8F). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 8F MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for free-machining austenitic stainless steel nuts. The "F" designation highlights specific chemical additives designed to significantly improve machinability and threading speeds.
- Full Traceability: Certified with TC No.: S303/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the Chromium-Nickel chemistry of AISI Type 303 stainless steel. Most importantly, it verifies the deliberate addition of Sulfur (or Selenium) at a minimum of 0.15%, which creates micro-inclusions that break up machining chips.
- Mechanical & Proof Load Testing: Comprehensive reporting of critical fastener metrics, validating the nut's Proof Load capability (typically min 550 MPa for standard Class 1) to ensure structural integrity despite the free-machining additives.
- Heat Treatment Tracking: Verifies the essential Carbide Solution Treatment (Solution Annealing) at a minimum of 1900°F (1040°C) followed by a rapid water quench to preserve corrosion resistance.
- 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 8F Data
Review the standard parameters and layout before downloading the full document.
TC Number
S303/26-XX
TC Date
20.08.20XX
Material Spec
ASTM A194 GRADE 8F (CLASS 1)
Nut Shape / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20-2.5P
Quantity
350.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.08 | 1.50 | 0.055 | 0.18 | 0.45 | 18.20 | 8.50 |
| Max: 0.15 | Max: 2.00 | Max: 0.20 | Min: 0.15* | Max: 1.00 | Min: 17.00 Max: 19.00 |
Min: 8.00 Max: 10.00 |
* Note: Free-machining property is achieved via Sulfur (min 0.15%) or Selenium (min 0.15%).
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) |
|---|---|
| 580.40 | 160, 165, 162 |
| Min: 550 | Min: 126 Max: 321 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for high-temperature pipeline fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 8F with respect to the tests carried out.
| 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 Temp: Min 1900°F (1040°C)
- 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 8F MTC Certificate
What does the "F" stand for in Grade 8F?
The "F" designates that this is a Free-Machining grade of stainless steel (equivalent to AISI Type 303). It contains a deliberate addition of Sulfur or Selenium (minimum 0.15%). These elements form microscopic non-metallic inclusions in the steel matrix that cause machining chips to break off cleanly, significantly improving cutting speeds and reducing tool wear when threading nuts.
How does Grade 8F differ from standard Grade 8?
Grade 8 is made from standard Type 304 stainless steel, which can be somewhat gummy and difficult to machine. Grade 8F (Type 303) solves this with the free-machining additives. However, there is a trade-off: the added Sulfur or Selenium slightly reduces the overall corrosion resistance of Grade 8F compared to Grade 8, making it slightly less suitable for highly aggressive marine or chemical environments.
Why is "Carbide Solution Treatment" tracked on this certificate?
During manufacturing, austenitic stainless steels can precipitate chromium carbides at the grain boundaries, which lowers their natural corrosion resistance. The MTC confirms that the nuts were reheated to at least 1900°F (1040°C) to dissolve these carbides fully back into the alloy solution, followed by a rapid water quench to lock the optimal microstructure in place.