Beaver Island Parts Company
Cast Iron Piston Ring 100 x 4 x 4.7mm (3.937" x 0.157" x 0.185")
Cast Iron Piston Ring 100 x 4 x 4.7mm (3.937" x 0.157" x 0.185")
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FINAL SALE - NO RETURNS. THIS IS A STANDARD CATALOGUE SIZE; CONFIRM YOUR DIMENSIONS AND MATERIAL BEFORE ORDERING.
Because standard sizes are chosen by measurement rather than by machine model, they ship as final sale. If we send the wrong item, or it arrives damaged or defective, we replace it free of charge, and that never changes.
Running hot hydraulic or pneumatic service where elastomer piston seals give up? Cast iron piston rings take heat and shock loads.
This Beaver Island Parts Company part is a cast iron piston ring, measuring 100 x 4 x 4.7mm (3.937" x 0.157" x 0.185"), made with Cast Iron.
Specifications
| Part type | Cast Iron Piston Ring |
| Bore / outside diameter | 100mm |
| Groove / inside diameter | 4mm |
| Height | 4.7mm |
| Converted size | 3.937" x 0.157" x 0.185" |
| Material | Cast Iron |
| Temperature range | to +600°F |
What It Fits
Used in high-temperature hydraulic and pneumatic cylinders and actuators. If your parts list or the old seal reads 100 x 4 x 4.7mm, this is the size.
Design and Material
Cast iron piston rings tolerate heat and shock loading that would destroy elastomer seals.
You Can Do This Repair
Clean the groove, expand the ring carefully over the piston, and stagger ring gaps if more than one ring is used.
Pro Tip: Check ring end gap in the bore before installing.
Shipping: This part is special-ordered and packed for you. It ships from our facility in about 10 business days, then transits by the carrier service you choose at checkout. The estimated delivery date shown on this page includes that lead time.
Why Buy From Beaver Island Parts Company
- Every dimension published. Size, material, hardness and temperature rating are listed up front so you can confirm fit before you buy, not after.
- Inspected, packed and labeled by us. Each order is checked and repacked in a bag labeled with the part's size and material, so it never gets lost in a parts bin.
- Real people who answer fitment questions. We are an American family-owned and operated small business. Send us your measurements or model number and we will help you confirm the right part.
- Replacement guarantee. If we ship the wrong item, or it arrives damaged or defective, we replace it free of charge.
Frequently Asked Questions
Q: How do I know this is the right size?
A: Seals are sized by measurement: bore / outside diameter, groove / inside diameter and height. Measure the shaft and bore, not just the old seal, which may be worn or distorted. This part measures 100 x 4 x 4.7mm.
Q: Can I do this repair myself?
A: Yes, with basic hand tools and patience. Clean everything, work without sharp tools near the sealing lips, lubricate before assembly, and press seals in square. The installation notes above walk through the key steps.
Q: When will it ship?
A: It ships from our facility in about 10 business days, then transits by the carrier service you choose.
Add it for $8.99, save $5.00
Don't install it dry.
Dry seals and o-rings pinch, twist and tear going in, and that is a second teardown you did not need. AQUA FLEX is NSF H1 rated and one tube covers dozens of installs.
$5.00 comes off automatically when it ships with this order. No code.
