Custom machined part
Plastic wear rings & guide rings
- Duty
- Cylinders, rods & pumps
- Forms
- Continuous or cut
- Quantity
- No minimum
- Repeats
- Common sizes kept
Machined plastic wear rings for hydraulic cylinders, compressors and pumps. Made to your drawing or matched to your worn ring, with no minimum quantity.
- ±0.002"–±0.005" on critical dimensions
- Family owned in Aurora since 1986
- Expedited service for breakdowns
Two jobs, one name
Which wear ring do you have?
A cylinder ring and a pump ring share a name but do different jobs, wear differently and need different information.
- DIAGRAM: piston in bore with wear ring and separate seal labeled
Cylinder & rod rings
Guide the piston or rod, carry the side load and keep metal off metal, which protects the seal. Also called guide rings, or rider rings in compressors.
Signs it’s worn
- Rocking or side play
- Uneven wear or scoring
- Seal trouble from lost guidance
Key thing to tell us: the groove and the ring’s cross-section.
In cylinders, “wear ring” and “guide ring” usually mean the same part: one name stresses its sacrificial wear surface, the other its guidance.
Ring forms
Continuous or cut?
A cut ring opens to fit into a closed groove, and its gap leaves room for heat growth. Tell us which your drawing or old ring uses.
- DIAGRAM: continuous ring joint
Continuous
A solid ring, for grooves it can be slid into.
- DIAGRAM: butt cut ring joint
Butt cut
A straight joint across the ring.
- DIAGRAM: angle cut ring joint
Angle cut
A diagonal joint that overlaps as it closes.
- DIAGRAM: step cut ring joint
Step cut
A stepped joint that overlaps for better guidance across the gap.
What defines the ring
Matching your ring
Choose a ring type. A worn ring may not show its original section or gap, so we also work from the groove or mating sizes.
Cylinder and rod rings
- Location
-
- Piston, rod or compressor
- Guiding role
- Seal arrangement beside it
- Ring and groove
-
- ID and OD
- Cross-section and width
- Gap or joint
- Chamfers
- Full groove sizes
- Mating surface
-
- Bore or rod size
- Its material and finish
- Duty
-
- Stroke and cycle
- Side load and shock
- Temperature and fluid
- Lubricated or dry
Pump rings
- Location
-
- Case or impeller
- Which ring rotates
- Fit
-
- Both mating diameters
- Running clearance needed
- Axial length
- How it’s retained
- Pump and fluid
-
- Fluid and temperature
- Speed
- Start-stops or dry-running risk
- Current rings
-
- Current material
- Measured clearance
- Damage seen
Getting a quote
Start with what you have
Any one of these is enough to get a quote started. Pick yours to see what helps.
Send the drawing and we machine to it.
- Quantity
- Material grade, if named
- Whether an equivalent is allowed
Upload drawings, CAD files or photos on the quote form.
Send the old ring with the groove or mating sizes.
- Cylinder or pump
- What’s worn or broken
- Quantity
Upload drawings, CAD files or photos on the quote form.
Tell us your part number or the last order.
- Part number or PO
- Quantity
- Anything that’s changed
Upload drawings, CAD files or photos on the quote form.
Plastics for wear rings
Common choices, and why
We’ll suggest suitable plastics for your rings. These are the common ones; we machine most engineering plastics.
Compare materialsMachined in Aurora
How your wear rings are made
±0.002"–
±0.005"
On critical dimensions, depending on the plastic. Specs and CAD files are kept, so a reorder matches the last batch.
-
Turned to your section
Rings CNC turned to your diameters and cross-section, with chamfers and joints cut as drawn.
CNC turning -
No minimum quantity
One ring for a rebuild, or a full set for production.
-
Common sizes kept
We keep common sizes for repeat orders. Ask about availability when you quote.
Evaluating a supplier? See the shop and how we check the work.
Buyer questions
Wear ring FAQs
Something else? Call (630) 904-2525.
Usually not. In a cylinder the wear ring guides the piston or rod and carries side load, while a separate seal holds pressure. Send the full groove and seal arrangement.
Tell us the exact grade your drawing or old order calls for, and whether an equivalent is allowed. We’ll confirm what we can supply with the quote.
We keep common sizes for repeat orders. Exact sizes and availability are confirmed when you quote.
We hold ±0.002" to ±0.005" on critical dimensions, depending on the plastic. We review your drawing and confirm the critical dimensions, such as cross-section, with your quote.
Timing depends on the ring, material and quantity, and comes with your quote. For an emergency breakdown, ask about our expedited service.
Not a wear ring?
Find the right part
We machine almost any plastic part. If yours isn’t listed, describe it in a quote request.
Standard quote
Ready to send your ring details?
Experienced help from your first quote to the finished part.