Delrin

cnc machined delrin

At a Glance

Process

Lead Time

Colors

Tolerance

Price

Applications

As fast as 3 days
Delrin 150: White, black
Glass-Filled Delrin: White
Delrin AF: Brown
With drawing: as low as +/- 0.005 mm
No drawing: ISO 2768 medium
$$
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.

Fictiv also offers Delrin AF (13% PTFE-Filled) and Glass-Filled Delrin.

When compared with standard Delrin, Delrin AF has an increased coefficient of friction for applications that require lubrication. With an excellent wear resistance, toughness, strength and dimensional stability, this material is often found in load bearing applications such as bushings, bearings, cams, thrust washers, gaskets and valve seats.

Glass-filled Delrin offers superior stiffness and dimensional stability with a high resistance to creep. Glass fibers increase impact resistance and fatigue endurance. This material is commonly used for automotive applications, construction, fixturing, and gear manufacturing.

Material Properties

Delrin 150

Tensile Strength

Elongation at Break

Hardness

Density

Maximum
Temperature

McMaster Part Number

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

Delrin AF (13% PTFE Filled)

Tensile Strength

Elongation at Break

Hardness

Density

Maximum
Temperature

McMaster Part Number

7,690 - 8,100 PSI
10.3%
Rockwell R115-R118
1.41 g/㎤
0.05 lbs / cu. in.
185° F

Delrin (30% Glass Filled)

Tensile Strength

Elongation at Break

Hardness

Density

Maximum
Temperature

McMaster Part Number

7,700 PSI
6%
Rockwell M87
1.41 g/㎤
0.06 lbs / cu. in.
185° F

Material Finish

Delrin-150 and Glass-Filled Delrin materials are naturally opaque white because of its crystalline structure and has a matte finish. Delrin AF comes in a brown color (pictured on the right).

cnc machined delrin

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