This is the shear key that locks a pulley to its shaft on PolarCool belt drive evaporative coolers. If your fan prop or motor pulley is slipping, this small part is usually the reason, and it's a low-cost fix before you start suspecting the motor or belt.
The shear key is a small part, but it does real work: it transfers torque from the motor shaft to the pulley, and from the pulley shaft to the fan prop. When it wears, cracks, or shears (as designed under overload), you get slippage, noise, or a fan that won't spin even though the motor runs. This replacement key is built to PolarCool's original fitment for belt drive units. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- Fits all PolarCool belt drive evaporative cooling fans, including 36" Single Speed fans and 48" models (120V and 240V, 50Hz and 60Hz).
- Used at two locations per fan: the fan prop pulley end of the shaft and the motor pulley end of the shaft.
- Compatible with motor pulleys SKU 1011-2650 and 1011-2647, and prop pulley SKU 1011-0100.
- Does NOT fit direct drive (non-belt) fan systems that have no pulley-shaft connection. [NEEDS VERIFICATION]
- Not verified for non-PolarCool cooler brands; treat as PolarCool-specific unless confirmed otherwise. [NEEDS VERIFICATION]
- Exact shear key dimensions (length, diameter) not provided by manufacturer data; reference your shaft or pulley part number to confirm sizing. [NEEDS VERIFICATION]
Shear keys wear invisibly at the keyway edges long before they visibly crack, and a worn key lets the pulley walk on the shaft — that's your technical friction. Left unaddressed, this misalignment chews up the keyway itself, turns a $1 part replacement into a shaft or pulley replacement, and can throw belt tension out of spec enough to strain the motor bearing. Before reinstalling, inspect the keyway with a flashlight and a machinist's file for burrs, and check belt alignment with a straightedge or laser alignment tool once the new key is seated. Always disconnect power and follow lockout/tagout procedures per OSHA and manufacturer guidelines before you touch the pulley — this is standard practice for any rotating equipment service, not optional shortcut territory.
Key Benefits
- Genuine PolarCool replacement component built to original fitment.
- Restores secure pulley-to-shaft connection, preventing slippage and power loss.
- Durable construction intended to hold up in industrial and warehouse cooling duty cycles.
- Simple, low-cost swap that avoids unnecessary pulley or motor replacement.
- Works across the PolarCool belt drive lineup, simplifying your spare parts inventory.
| Spec | Value | Unit |
|---|---|---|
| Type | Shear Key | - |
| Function | Pulley-to-shaft connection, belt drive models | - |
| Application Location | Fan prop pulley end and motor pulley end of shaft | - |
| Compatible Fan Size | 36" Single Speed, 48" | inches |
| Voltage Compatibility | 120 / 240 | V |
| Frequency Compatibility | 50 / 60 | Hz |
| Compatible Motor Pulley SKUs | 1011-2650, 1011-2647 | - |
| Compatible Prop Pulley SKU | 1011-0100 | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: All PolarCool belt drive evaporative cooling fans, including 36" Single Speed and 48" models, 120V/240V, 50Hz/60Hz.
- Fits: Motor pulleys SKU 1011-2650, 1011-2647; prop pulley SKU 1011-0100.
- Does NOT fit: Direct drive (non-belt) evaporative cooling fans. [NEEDS VERIFICATION]
- Does NOT fit: Non-PolarCool cooler brands unless separately confirmed. [NEEDS VERIFICATION]
| Item | Guidance |
|---|---|
| Power Safety | Disconnect power and follow lockout/tagout procedures before installation. |
| Pre-Install Inspection | Inspect shear key for damage, wear, or cracks before installation; replace if defects are present. |
| Seating Check | Ensure shear key is properly seated in the keyway to prevent slippage and power transmission loss. |
| Post-Install Check | Verify pulley is securely mounted; check belt tension and alignment after installation. |
FAQ
What does this shear key fit?
It fits all PolarCool belt drive evaporative cooling fans, including 36" Single Speed fans and 48" models in 120V/240V, 50Hz/60Hz configurations.
Where is the shear key used on the fan?
It is used on the fan prop pulley end of the shaft and the motor pulley end of the shaft.
Which pulleys is this shear key compatible with?
It is compatible with motor pulleys SKU 1011-2650 and 1011-2647, and prop pulley SKU 1011-0100.
Will this work on a direct drive cooler?
No. This shear key is designed for belt drive PolarCool models only. [NEEDS VERIFICATION] for direct drive compatibility.
How many shear keys do I need per fan?
Reference your shaft or pulley part number for exact quantity specifications; most fans use one at the prop pulley and one at the motor pulley.
Warranty & Registration
Manufacturer warranty terms for this shear key were not included in the supplied data. Ask us before you order if you need warranty confirmation in writing, and check the "Resources (System Manuals and Warranty)" Tab above for the current PolarCool warranty document. [NEEDS VERIFICATION]
