12 Point Flange Screws, Counterbore Screws Manufacturer in China

Zhenkun offer 12 Point Flange Screws, Counterbore Screws in different sizes & standards.12 Point Flange Screws, Counterbore Screws are also available in different materials and grades.12 Point Flange Screws, Counterbore Screws used for construction materials for projects such as docks, bridges, highway systems, and homes, among other things.

Counterbore Screws

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

Counterbore Screws Diameters

Counterbore Screws are available from Zhenkun factory with Imperial/US diameters that range from #1 to 2 and with Metric diameters that range from M2.5 to M30. The length of Counterbore Screws is usually measured from the point to the underside of the head.

US/Imperial diameters

• •#1   •#2   •#3   •#8   •#10   •#12   •3/16   •1/4   

• •5/16   •3/8   •7/16   •1/2   •9/16   •5/8   •3/4   •7/8   

• •1   •1 1/8   •1 1/4   •1 1/2   •1 3/4   •2   

Metric diameters

• •M2.5   •M3   •M3.5   •M4   •M6   

• •M7   •M8   •M10   •M12   •M14   

• •M16   •M20   •M24   •M30   

Counterbore Screws Lengths

Counterbore Screws are available from Zhenkun factory with lengths that range from 3/16 to 12 1/2.

US/Imperial lengths

• •3/16   •3/8   •1/2   •5/8   •3/4   •7/8   •1   •1 1/4   •1 3/8   •1 1/2   •1 3/4   •2   •2 1/8   

• •2 1/4   •2 3/8   •2 1/2   •2 3/4   •3   •3 1/4   •3 1/2   •3 3/4   •4   •4 1/4   •4 1/2   •4 3/4   •5   

• •5 1/4   •5 1/2   •5 3/4   •6   •6 1/2   •7   •8   •8 1/2   •9   •10   •12   •12 1/2   

Metric lengths

• •2   •4   •6   •7   •12   •16   •20   •22   •23   •25   •26   •29   •30   

• •31   •32   •35   •40   •45   •50   •55   •60   •65   •70   •75   •80   •85   

• •90   •95   •100   •110   •115   •120   •130   •135   •140   •145   •150   •160   •175   

Counterbore Screws Materials

Counterbore Screws are available from Zhenkun factory in materials that range from Steel to Plastic

• •Steel   •Grade 5   •Grade 8   •Grade 9   •Grades L7, L7M   •Grade B7   •Grade B7M   •Grade B8M   •Grade B16   •Class 8.8   

• •Class 9.8   •Class 10.9   •Class 12.9   •Class 14.9   •300 Stainless (A1,A2, 18-8,304,310 etc.)   •316, 317, A4 Stainless   •Superalloy (Inconel, Hastelloy, Alloy 20)   •Aluminum   •Plastic   

Counterbore Screws Finishes

Counterbore Screws are available from Zhenkun factory in finishes or coatings that range from Plain to Silver

•    Plain   Zinc/Clear   Zinc/Yellow   Zinc/Black   Galvanized   Aluminum zinc flake (Dacromet, Magnigard, Doerken)   Black Oxide

•    Cadmium   Chrome   Fluoropolymer (Xylan, Fluorokote, Teflon)   Nickel   Passivated   Phosphate   Silver