Peerless Industrial Group
Peerless Industrial Group Tire Chains Single Bus & RV V-Bar PK2 QG2821
$67.99
0.00081248BTC
In stock
SKF
SKF 3621 rotary shaft seal HM3 nitrile .375 ID .563 OD .094 width
Rotary shaft seal with .375 in inside diameter, .563 in outside diameter and .094 in width for grease-lubricated agricultural machinery
- ColorTransparent
- Nitrile lip resists oil, grease and fuel
- HM3 design suits grease-lubricated agricultural machinery
- 375 in bore fits 3/8 in shafts
- 563 in OD seats in standard housings
- 2 220 RPM limit covers low-speed engine drives
SKF 3621 Rotary Shaft Seal HM3
The SKF 3621 is a nitrile rubber rotary shaft seal designed for grease-lubricated agricultural machinery. It fits a 0.375 inch inside diameter and a 0.563 inch outside diameter with a 0.094 inch overall width. The single-lip HM3 design handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil, and mineral oils. It is not suited for high-pressure hydraulic systems exceeding the low-pressure rating.
Thermals Noise and Power Draw
As a passive sealing component, the seal generates no operational noise and draws no electrical power. Thermal performance depends on the shaft speed and lubrication condition rather than the seal itself. The nitrile lip material is compatible with standard operating temperatures found in grease-lubricated agricultural equipment. Frictional heat remains minimal at the rated rotational speed.
Sustained Load Behaviour
The seal is rated for a maximum rotational speed of 2,220 RPM and a maximum pressure of 3 psi. Under continuous operation within these limits, the single nitrile lip maintains contact to retain grease and exclude contaminants. The design lacks a spring, so radial load relies on material elasticity. Exceeding the speed or pressure rating will accelerate lip wear and reduce sealing effectiveness.
Highlights
- Nitrile lip resists oil, grease and fuel
- HM3 design suits grease-lubricated agricultural machinery
- 375 in bore fits 3/8 in shafts
- 563 in OD seats in standard housings
- 2 220 RPM limit covers low-speed engine drives
Specifications
| Brand | SKF |
|---|---|
| Color | Transparent |
Questions about this item
How do I press the 3621 seal into a .563 in bore without damaging the nitrile lip?
Use a flat-faced driver that contacts only the metal case, press straight in until the case sits flush, and never strike the .094 in wide lip directly.
When should the 3621 seal be replaced in a grease-lubricated agricultural machine?
Replace the seal at each scheduled bearing service or whenever the nitrile lip shows hardening, cracking, or grease leakage past the single contact lip.
What is the maximum continuous speed the 3621 seal can handle before heat buildup becomes a problem?
The seal is rated for 2,220 RPM; sustained operation above this speed increases lip temperature and accelerates nitrile wear.
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