Short answer: choose CNC rod stock by diameter overshoot for chucking, property orientation acceptable to the part, and grade matched to duty — then let minimum-density values on the certificate protect the machining outcome. Rod selection is machining economics in disguise.
Stock selection tips that save money
- Design to standard diameters: a part sized to a stock Ø skips a facing operation entirely.
- Oversize for grip: PTFE deforms in chucks; extra diameter and soft-jaw technique protect tolerance.
- Orientation matters: rings from extruded rod behave differently from molded blanks — state the part, not just the size.
- https://ptfesuppliers.com/product-category/rade by duty: virgin for general parts; glass/bronze-filled where load or wear live.
Chunhuan supplies virgin and filled rod cut to length since 1985, with route and density data per lot. Send the part drawing with the stock request; diameter advice is free — scrap isn’t.
Frequently Asked Questions
What rod diameter should I buy for machining?
One step above finished diameter for chucking grip, ideally a standard stock size to skip facing operations.
Does PTFE rod orientation affect machined parts?
Yes — extruded rod is directional. For rings and seals, molded blanks may hold properties better; state the final geometry.
Which grade rod for general machining?
Virgin for most parts; glass or bronze-filled where the part sees load, wear or cycling.
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