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Stainless Steel Bolts are tough, corrosion-resistant fasteners that find their way into a variety of industrial, commercial, and structural applications, thanks to their impressive mechanical strength and ability to withstand environmental wear. Crafted from different grades of stainless steel—like 304, 316, and 410—these bolts promise a long lifespan, even in challenging or corrosive environments such as marine, chemical, and outdoor settings. The natural oxide layer on stainless steel helps prevent rust and degradation, making these bolts perfect for projects that demand both strength and a polished look. You’ll often see them in construction, machinery, automotive, food processing, and energy sectors.
The makeup of stainless steel bolts changes depending on the grade. For instance, SS 304 has about 18% chromium and 8% nickel, striking a nice balance between strength and corrosion resistance. SS 316 takes it up a notch with 2–3% molybdenum, boosting its resistance to chlorides and harsh chemicals, while grades like 410 are known for their higher hardness and tensile strength due to extra carbon. Generally, the mechanical properties of stainless steel bolts show tensile strengths ranging from 500 to 860 MPa, varying by grade and treatment, along with good elongation, fatigue resistance, and temperature stability.
| ASTM/ASME Specifications | ASTM A193 / ASME SA 193, ASTM A194 / ASME SA 194 |
| Bolts, Studs Threads | UNC, METRIC, BSF, UNF, BSW or Custom |
| Head drive | Phillips, Six-Lobe, Phillips/Slot, Slotted |
| Stainless Steel Bolts | Hex Bolts, Flange Bolts, Square Bolts, T Bolts, Eye Bolts, U Bolts, Lag Bolts, Counter Sunk Bolts, J Bolts, Hex Head Bolts |
| Grade | AISI | Stainless Steel Bolts Chemical Composition (% maxima unless stated) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu | ||||||
| A1 | SS 202 | 0.12 | 1.0 | 6.5 | 0.20 | 0.15-0.35 | 16,0 – 19,0 | 0.7 | 5,0 – 10,0 | 1.75-2.25 | ||||
| A2 | SS 304 | 0.08 | 1.0 | 2.0 | 0.05 | 0.03 | 15,0 – 20,0 | 0.0 | 8,0 – 19,0 | 4.0 | ||||
| A3 | SS 321 | 0.08 | 1.0 | 2.0 | 0.05 | 0.03 | 17,0 – 19,0 | 0.0 | 9,0 – 12,0 | 1.0 | ||||
| A4 | SS 316 | 0.08 | 1.0 | 2.0 | 0.05 | 0.03 | 16,0 – 18,5 | 2,0 – 3,0 | 10,0 – 15,0 | 4.0 | ||||
| C1 | SS 410 | 0.09-0.15 | 1.0 | 1.0 | 0.05 | 0.03 | 11,5 – 14,0 | – | 1 | – | ||||
| C3 | SS 431 | 0.17-0.25 | 1.0 | 1.0 | 0.04 | 0.03 | 16,0 – 18,0 | – | 1,5 – 2,5 | – | ||||
| C4 | SS 416 | 0.08-0.15 | 1.0 | 1.5 | 0.06 | 0.15-0.35 | 12,0 – 14,0 | 0.6 | 1 | – | ||||
| F1 | SS 430 | 0.12 | 1.0 | 1.0 | 0.04 | 0.03 | 15,0 – 18,0 | 0.0 | 1 | – | ||||
| Stainless Steel Bolts | Class | Tensile Stress Rm MPa (N/mm2) minimum | Yield Strength Rp 0.2 Mpa (N/mm2) minimum | AL Minimum Elongation | Diameter |
|---|---|---|---|---|---|
| Stainless Steel Bolts | 70 | 700 | 450 | 0.4d | =<M20 |
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Stainless Steel Bolts are essential across various industries due to their strength and resistance to corrosion. In construction, they secure structural elements and frameworks. Automotive applications rely on them for engine and chassis assemblies. Aerospace industries use them in high-stress components, while marine environments benefit from their rust resistance. Additionally, stainless steel bolts are used in machinery and equipment, food processing, and medical devices, where durability, reliability, and hygiene are critical for performance and safety.
You’ll find Stainless Steel Bolts in a wide range of applications, including structural frameworks, pressure vessels, pipelines, marine equipment, bridges, and HVAC systems. In industries like food, medical, and pharmaceuticals, they’re favored for their non-reactive and hygienic qualities. In marine and coastal areas, 316 stainless steel bolts are the go-to choice for their exceptional resistance to saltwater. Their strength, reliability, and low maintenance needs make stainless steel bolts a go-to fastening solution for engineers, fabricators, and maintenance professionals in sectors where performance and corrosion resistance are key.
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