Counterbore Screws, ASTM A574

12-point Flange Screws, Counterbore Screws,  Ferry Head Cap Screws or Counterbore Screws, feature a 12 point head and a flanged bearing surface. Usually fully threaded, the 12-point design provides for higher tightening torque, without edge rounding and they are covered under ASME Standard B18.2.1

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CIFIL12 Point Flange Screw (CounterBore)ASTM A574Plain1/2-13 x 31/2-13 x 3 12 point flange bolt per astm a 574 alloy plain797

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