Zeron Fastners
ASTM A307 Blind Flanges
ASTM A307 Blind Flanges refers to standard carbon steel blind flanges (typically conforming to ASTM A105) that are paired with ASTM A307 Grade A or B bolting materials. Blind flanges are solid disc fittings used to seal off the end of a piping run or a pressure vessel opening. The A307 specification covers carbon steel bolting materials (bolts, stud bolts, and threaded rods) intended for general purpose applications, particularly where pressure and temperature conditions are mild (e.g., up to 450°F). Zeron Fastners supplies these flanges and associated A307 fasteners for use in utility lines, low-pressure plumbing, and non-critical industrial services where cost-effectiveness and reliable sealing are the primary requirements.
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ASTM A307 Grade A Bolting Chemical Composition (for Flange Assembly)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.28 max |
| Manganese (Mn) | 1.20 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.050 max |
| Silicon (Si) | — |
ASTM A307 Grade A Bolting Mechanical Properties (for Flange Assembly)
| Property | Value (min) |
|---|---|
| Tensile Strength | 60 ksi (414 MPa) |
| Yield Strength | Not specified |
| Elongation in 2 in. (50mm) | 18% |
| Hardness (Brinell max) | N/A (Generally lower than 183 HB) |