Zeron Fastners
ASTM A325 Blind Flanges
ASTM A325 Blind Flanges refers to the assembly of Blind Flanges (solid discs used to seal pipe ends, typically ASTM A105 carbon steel) utilizing ASTM A325 high-strength structural bolting. The A325 specification ensures the bolts provide exceptional tensile strength and superior clamping force, making this assembly ideal for applications that require blocking a line under high pressure or for long-term termination. The combination of carbon steel flanges and A325 fasteners is common in industrial and utility piping where robust structural integrity and leak prevention are paramount. Zeron Fastners supplies both the necessary flange components and the A325 bolting for these critical sealing and isolating applications.
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ASTM A325 Type 1 Bolting Chemical Composition (Used with Blind 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 Blind 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 |