Zeron Fastners
ASTM A325 Slip-On Flanges
ASTM A325 Slip-On Flanges refers to the assembly of Slip-On Flanges (SOF—typically ASTM A105 carbon steel) utilizing ASTM A325 high-strength structural bolting. Slip-On Flanges are easily recognized by their bore size, which is slightly larger than the pipe's outer diameter, allowing the flange to simply slip over the pipe. The connection is secured by welding the flange inside and out. When secured with A325 bolts, the assembly benefits from the high tensile strength and superior clamping force of the quenched and tempered carbon steel fasteners. This combination is common in general industrial piping for moderate pressure and temperature applications where robust, high-strength connections are required. Zeron Fastners supplies the necessary SOF components and A325 bolting for these critical pipeline assemblies.
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ASTM A325 Type 1 Bolting Chemical Composition (Used with Slip-On Flanges)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.30 – 0.52 |
| Manganese (Mn) | 0.60 min |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.045 max |
| Silicon (Si) | 0.10 min |
| Boron (B) | Optional |
ASTM A325 Bolting Mechanical Properties (Used with Slip-On Flanges)
| Property | 1/2" to 1" Diameter (min) | 1-1/8" to 1-1/2" Diameter (min) |
|---|---|---|
| Tensile Strength | 120 ksi (827 MPa) | 105 ksi (724 MPa) |
| Yield Strength (0.2% Offset) | 92 ksi (634 MPa) | 81 ksi (558 MPa) |
| Elongation in 4D | 14% | 14% |
| Hardness (Brinell max) | 319 HB | 319 HB |