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ASTM A194 8M Heavy Hex Nut
QS Fastener: ASTM A194 8M Heavy Hex Nut
Name: ASTM A194 8M Heavy Hex Nut
Material: ASTM A194 8M, SS316
Usage: For Kitchen Appliance, Sinks, Food Processing Equipments
Standard: ANSI B18.2.2
Thread: 8 UN
Thread Class: 2B
Size: 1-1/2 Inch
Material: ASTM A194 8M, SS316
Usage: For Kitchen Appliance, Sinks, Food Processing Equipments
Standard: ANSI B18.2.2
Thread: 8 UN
Thread Class: 2B
Size: 1-1/2 Inch
Quantity
ASTM A194 8M Heavy Hex Nut (Heavy Hex Nut) is manufactured from food-grade SS316 stainless steel, combining exceptional corrosion resistance with high strength, specifically designed for demanding environments such as kitchen appliances, sinks, and food processing equipment. Compliant with ANSI B18.2.2 standards and equipped with 8 UN 2B threads, it ensures superior sealing performance and assembly compatibility. Its thickened hex structure and large 1-1/2 inch size enable the ASTM A194 8M Heavy Hex Nut to deliver higher preload and anti-loosening capabilities.
Outstanding Corrosion Resistance
As a critical fastener, the ASTM A194 8M Heavy Hex Nut exhibits a prominent molybdenum-based corrosion inhibition mechanism:
The 2-3% molybdenum content in 316 stainless steel activates the following protective mechanisms:
1. Passive Film Enhancement: Molybdenum integrates into the passive film (primarily Cr₂O₃) as MoO₄²⁻, increasing film density. XPS analysis shows a 40-60% reduction in defect density compared to 304.
As a critical fastener, the ASTM A194 8M Heavy Hex Nut exhibits a prominent molybdenum-based corrosion inhibition mechanism:
The 2-3% molybdenum content in 316 stainless steel activates the following protective mechanisms:
1. Passive Film Enhancement: Molybdenum integrates into the passive film (primarily Cr₂O₃) as MoO₄²⁻, increasing film density. XPS analysis shows a 40-60% reduction in defect density compared to 304.
2. Repassivation Promotion: At Cl⁻ attack sites, molybdenum preferentially forms soluble molybdate (MoOCl₄²⁻), accelerating local repassivation at rates 3-5 times faster than 304.
3. Adsorption Layer Formation: Molybdenum creates an MoCl₂ adsorption layer in active dissolution zones, reducing ion mobility at the metal/solution interface.
Corrosion Performance Comparison
| Parameter | ASTM A194 8M Heavy Hex Nut (316) | 304 Stainless Steel | Test Standard |
| Critical Pitting Temp. (CPT) | 22-28°C | 8-12°C | ASTM G150 |
| Critical Crevice Temp. (CCT) | 15-20°C | 0-5°C | ASTM G48 Method D |
| Pitting Potential (Eb) | +350-450mV(SCE) | +100-250mV(SCE) | ASTM G61 (3% NaCl) |
Performance in Chloride Environments
1. Marine Applications:
- In seawater at 25°C, the ASTM A194 8M Heavy Hex Nut demonstrates 10-15 times longer pitting initiation time than 304, making it ideal for prolonged immersion.
1. Marine Applications:
- In seawater at 25°C, the ASTM A194 8M Heavy Hex Nut demonstrates 10-15 times longer pitting initiation time than 304, making it ideal for prolonged immersion.
- Salt spray tests (ASTM B117) reveal red rust onset at 500-1000 hours, far exceeding 304’s 96-200 hours.
2. Acidic Environments:
- In pH 2, 1% FeCl₃ solution, the ASTM A194 8M Heavy Hex Nut exhibits a weight loss rate of only 0.12 g/m²·h, compared to 1.8 g/m²·h for 304.
- In pH 2, 1% FeCl₃ solution, the ASTM A194 8M Heavy Hex Nut exhibits a weight loss rate of only 0.12 g/m²·h, compared to 1.8 g/m²·h for 304.
Temperature Effects & Engineering Validation
In environments with 500 ppm Cl⁻ at 60°C:
- The ASTM A194 8M Heavy Hex Nut maintains an intact passive film, while 304 suffers generalized corrosion.
In environments with 500 ppm Cl⁻ at 60°C:
- The ASTM A194 8M Heavy Hex Nut maintains an intact passive film, while 304 suffers generalized corrosion.
- Case Studies:
- Bolted connections using ASTM A194 8M Heavy Hex Nut on offshore platforms retain >90% torque after 5 years.
- In chemical pipeline flanges, its service life reaches 8-10 years, significantly outperforming 304.
- Bolted connections using ASTM A194 8M Heavy Hex Nut on offshore platforms retain >90% torque after 5 years.
- In chemical pipeline flanges, its service life reaches 8-10 years, significantly outperforming 304.
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