Zeron Fastners
SS 347 Threaded Rods (All Thread Studs) - Metric and Imperial
SS 347 Threaded Rods, often referred to as All Thread Studs, are essential fasteners used in applications requiring variable length engagement or through-bolting with nuts on both ends. This specific grade is a premium austenitic stainless steel known for its stabilization with Niobium (Columbium), which significantly enhances its resistance to **intergranular corrosion**—a critical feature when the rod operates in high-temperature environments, particularly after welding or heat treatment. Manufactured and supplied by Zeron Fasteners, our SS 347 rods ensure maximum longevity and reliability in harsh conditions found in power generation, chemical plants, and exhaust systems, outperforming standard SS 304 and 316 grades under specific high-heat exposure.
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SS 347 Threaded Rod Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Niobium (Nb) + Tantalum (Ta) | 10 x C – 1.00 |
Note: The combined Niobium and Tantalum content must be ten times the Carbon content minimum, up to a maximum of 1.00%.
SS 347 Threaded Rod Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation | 30% |
| Reduction of Area | 50% |
| Brinell Hardness (HB) | 217 max |