Overview
A plastic shoulder washer is a molded washer with a raised boss around its bore. It is molded as one part: a flat disc, a shoulder standing up from one face, and a through bore on the same center line as the shoulder.
The shoulder drops into a hole in a panel, a bracket or a housing, and the disc seats flat on the face around it. One part does two jobs: it pilots the screw so the joint sits centered, and it holds a set gap between two faces. A plastic shoulder washer with no shoulder in the same tool family is a plain spacer.
One variant carries the boss off center, which turns the washer into a small eccentric plate that sets a lever or a blade at an angle.
Key Features & Benefits
- Shoulder into the bore: pilots the part so the joint sits centered
- Disc face: takes the seat and holds the gap you set
- Bore and shoulder on one center line: the screw drops through in one pass
- Flat, step and double step: one family covers different gap heights
- Offset boss: the shoulder sits out of the middle, so the disc works as an eccentric plate
Disc thickness and shoulder height come off the model, so a plastic shoulder washer from one tool repeats the gap from part to part.
Customization Options
- Bore: diameter
- Disc: outside diameter and thickness
- Shoulder: diameter, height and position
- Profile: flat, single step, double step or offset
- Material: nylon, acetal or a glass filled grade
- Color: natural, white or a matched shade
Two shoulder heights can run in one tool on different inserts, so a family of gaps needs one mold. The plastic shoulder washer you receive then swaps by height alone.
Quality & Delivery
Tooling for a plastic shoulder washer is cut in our own mold shop, and the first article is gauged against your 3D file, bore and shoulder height included, before the run is released.
Mold faces are polished to the sheen your 3D file calls for, the gate is trimmed flush, and the disc comes off the tool flat so it seats on a face with no rock. Lead time is quoted with the unit price and held to the date, and each batch is gauged before packing.
We mold every plastic shoulder washer to your 3D file, so the disc, the shoulder and the bore follow the model. Send the 3D file for a quotation with the tool cost and the unit price.
Related Capabilities
A flat part without the step sits beside this plastic shoulder washer. Our plastic washers and shims are molded to your 3D file with no shoulder, and the ring bushing holds a gap between two faces.
Where the disc carries a profile, the plastic cam and the molded spacer show where it grew from.
Molding runs in house on our mold making floor, with injection molding for the washer. Our automotive plastic parts page groups vehicle work, our capabilities page lists the cells and our works page shows past jobs.
