Fillister Head Screw
Customized/BS/DIN/GB/IFI Standard

1. Material: Steel, Alloy steel, Stainless steel, Brass, Copper, 
2. Finish: according to you need (Cr3+Z, Cr3+ZY, Cr3+BZ, Cr3+ Real Yellow Zinc, Ni, Bo, Tin, Passivation, ZnFe, ZnNi, ...etc.)
3. Process Capability: Diameter M1.2 to M12 Length:3 to 80mm 
4. High quality and competitive prices
5. Prompt delivery time
6. Country of Origin: China / Taiwan
7. Rohs/Reach Compliant/Halogen Free Compliance

Fillister heads are used in counter bored holes. A counterbore is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw, is required to sit flush with or below the level of a workpiece's surface. Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such. A spotface often takes the form of a very shallow counterbore.