Delrin

cnc machined delrin

At a Glance

Process

Lead Time

Colors

Tolerance

Price

Applications

3 days
White, black
ISO 2768
$$
High rigidity and strength applications like gears, bushings, and fixtures

About the Material

Delrin (generic: acetal) is a low-friction, high-stiffness material. It is used in applications ranging from auto parts to musical instruments. With a relatively high toughness and minimal elongation, Delrin boasts excellent dimensional accuracy.

Material Properties

Tensile Strength

Elongation at Break

Hardness

Density

Maximum
Temperature

McMaster Part Number

9,000 PSI
25%
Rockwell M90
1.412 g/㎤
0.051 lbs / cu. in.
180° F

Material Finish

Delrin is naturally opaque white because of its crystalline structure and has a matte finish.

Design Recommendations

Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size

Undercuts

Radii : Depth

0.5 mm
0.8mm
(0.03 in)
0.5mm
(0.02 in)
1200 x 500 x 152 mm [x,y,z] (mill) 
152 x 394 mm 
[d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x tool diameter.

Warping

Due to the composition of Delrin and temperatures from machining, it is highly susceptible to warping on large, flat parts or where there are thin walls. We recommend avoiding thin walls; if you need thin walls, use fasteners to clamp down your design.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii.

Related Resources

Engineer's Guide to CNC Machining for Prototyping Hardware
Fictiv CNC Material Datasheet