Rigid, low-friction engineering plastic, acetal (Delrin) is ideal for functional parts that slide, pivot, or mesh: Guides, bushings, gears, pulleys, jigs, and mechanical components. It machines cleanly on CNC with sharp edges and good dimensional stability.
Low moisture absorption, controlled wear, and good fatigue resistance make acetal a reliable solution for precise assemblies. Plan for protection if prolonged UV exposure; avoid strong oxidizing agents and aggressive solvents.
Key Characteristics
Finish: Smooth and dense on both sides for consistent sliding and clean bearing surfaces.
Cut orientation: Visible face in rendering is treated as top during machining.
Process: CNC cutting/machining (typical tolerance ±0.005").
Holding tabs: Small tabs may remain at perimeter; remove with light deburring.
Service temperature: Approx. −40°C to 90–100°C continuous depending on application.
Chemical compatibility: Good with light oils, non-oxidizing fuels, water, and mild detergents; avoid: strong oxidizing agents, concentrated acids, chlorinated/aromatic solvents.
Moisture: Low absorption; dimensions more stable than nylon in humid environments.
UV/outdoor: Sensitive; plan for enclosures, coatings, or protection for outdoor use.
Common Applications
Guides, rails, pads, sleeves, and bushings.
Gears, pulleys, rollers, cams, and moving parts.
Jigs, machining fixtures, fixture elements.
Covers and mechanical components requiring low friction and precision.
Design Best Practices
Provide functional clearances for thermal expansion and freedom of movement.
Use small internal radii rather than sharp corners to limit stress concentrations.
Recommended assembly: Through-bolts with washers, threaded inserts, or spacers; bonding more difficult, prefer mechanical fastening.
Limit local heating; avoid aggressive solvents and strong oxidizing agents.