Beaver Island Parts Company
Axial Gamma Seal 20 x 40 x 4mm, Buna-N Nitrile (0.787" x 1.575" x 0.157")
Axial Gamma Seal 20 x 40 x 4mm, Buna-N Nitrile (0.787" x 1.575" x 0.157")
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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.
Need a compact seal that keeps dust and water out of a bearing while it spins? A gamma seal rotates with the shaft and seals axially against the housing face.
This Beaver Island Parts Company part is an axial shaft seal with a metal case and rubber lip that seals against a flat face, measuring 20 x 40 x 4mm (0.787" x 1.575" x 0.157"), made with Buna-N Nitrile.
Specifications
| Part type | Axial Gamma Seal |
| Shaft / inside diameter | 20mm |
| Bore / outside diameter | 40mm |
| Width / height | 4mm |
| Converted size | 0.787" x 1.575" x 0.157" |
| Material | Buna-N Nitrile |
| Temperature range | -40°F to +250°F |
What It Fits
Used in bearing housings, gear motors, pumps, wheel ends and machinery exposed to dust or splash. If your parts list or the old seal reads 20 x 40 x 4mm, this is the size.
Design and Material
Buna-N is the all-round workhorse of sealing: tough, abrasion resistant and the right default for oil, hydraulic and water service.
You Can Do This Repair
Clean the shaft and counterface, push the seal onto the shaft so the lip lightly contacts the face, and lubricate the lip.
Pro Tip: Set the lip compression to the manufacturer's dimension; too much drag wastes power and heats the lip.
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: shaft / inside diameter, bore / outside diameter and width / height. Measure the shaft and bore, not just the old seal, which may be worn or distorted. This part measures 20 x 40 x 4mm.
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.
