SS 321 U-Bolts & J-Bolts are specialized, non-straight fasteners essential for securing piping, tubing, and structural elements. The U-Bolt provides a stable, saddle-like clamp for round components, while the J-Bolt functions as a hook or anchor. These fasteners are manufactured from Stainless Steel Grade 321, an austenitic alloy stabilized with the addition of Titanium. This critical element prevents the depletion of chromium at grain boundaries, ensuring the fastener retains its full resistance to intergranular corrosion, particularly when exposed to welding temperatures or continuous high-temperature service (425°C to 850°C). Zeron Fasteners manufactures and supplies heavy-duty SS 321 U-Bolts & J-Bolts that are indispensable in high-heat industrial applications, including exhaust systems, furnace equipment supports, and chemical processing pipelines, where reliable, thermally stable connections are required.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 |
| Manganese (Mn) | 2.00 |
| Silicon (Si) | 1.00 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | 5 x C – 0.70 |
| Phosphorus (P) | 0.045 |
| Sulfur (S) | 0.030 |
Note: The Titanium content is five times the Carbon content minimum, up to a maximum of 0.70%.
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation in 50mm | 35 % |
| Hardness (HB) | 217 max |
| Recommended Service Temperature | 850°C |