Outstanding chemical resistance at elevated temperatures

• Virtually inert to most organics, acids and bases
• Usable up to 260°C / 500°F and tougher than PTFE
• Excellent electrical insulator
• High purity for sensitive pharmaceutical and food type applications
• Material datasheet for PFA
• PFA flat head screw features and benefits

PFA flat head screws made from perfluoroalkoxy alkanes (PFAs) are fluoropolymers with properties similar to polytetrafluoroethylene (PTFE). PFA's are known for being exceptionally corrosion resistant and inert at elevated temperatures. PFA screws are inert to most chemical environments including organics, acids, bases, mixed chemicals and hyrdofluoric acid. Additionally PFA flat head screws are bio-inert and will not leach into or contaminate sensitive pharmaceuticals or food based products.

Compared to other high performance polymer screws like PEEK or PVDF, PFA screws offer the best all-around corrosion resistance especially at elevated temperatures. However the trade-off for its extraordinary corrosion resistance is its lower tensile strength compared to PVDF or PEEK flat head screws.

Screw Types: Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws

PFA Flat Head Screw Features and Benefits

PFA flat head screws are characterized by having a head with a top flat surface (which can feature either a slotted, phillips or allen driver) and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.

PFA Slotted vs. Phillips Driver 

Countersink Angle

For most flat head screw designs the angle of countersink is usually 82° for UNC and UNF applications however other angles ranging from 60° -120° could be specified.