Description
Size 21 Shear Pin 5-Pack | Boat Supply Store
Essential for safeguarding outboard motor lower units against over-torque conditions, this pack of five Size 21 shear pins acts as a sacrificial component. Engineered to fracture at a specific load, typically around 750-850 lbs of force, they prevent catastrophic damage to gears and drive shafts during impacts or prop entanglement. Crucial for boaters navigating shallow Texas waterways or operating trolling motors in heavy current, these pins ensure continued operation by absorbing shock loads.
Key Features
- Prevents drivetrain damage by sacrificing itself under extreme load.
- Protects expensive gears and drive shafts from over-torque events.
- Ensures reliable operation by absorbing impact energy.
- Engineered for precise failure under specific load conditions.
- Provides a cost-effective solution to major mechanical failures.
- Includes five units for immediate replacement needs.
- Designed for compatibility with various outboard motor applications.
- Facilitates quick field replacements to minimize downtime.
Specifications
| Product Specifications | |
|---|---|
| Size | 21 |
| Quantity | 5 per box |
Who This Is For
Boaters operating outboard motors who require a critical safety component to prevent drivetrain damage. Ideal for those who frequent areas with submerged obstacles or experience prop entanglement during operation.
How It Compares
| Feature | Size 21 Shear Pin 5-Pack | Generic |
|---|---|---|
| Pin Size | 21 | Typically less capable |
| Quantity | 5 | Typically less capable |
Common Concerns Answered
How do I know if my shear pin has failed?
A failed shear pin will result in the propeller spinning freely without engaging the drivetrain. You may hear a distinct 'snap' or 'pop' sound at the moment of failure, especially during sudden impacts or when the engine is under significant load.
What happens if I don't replace a broken shear pin?
Operating a motor with a failed shear pin will prevent the propeller from turning, rendering the engine ineffective for propulsion. Attempting to force operation can lead to further damage to the lower unit.
Can I use a different size shear pin?
Using a shear pin of a different size or material rating is not recommended. Shear pins are precisely engineered for specific load capacities to protect your drivetrain; deviating from the manufacturer's specification can lead to inadequate protection or premature failure.
Frequently Asked Questions
What is the primary function of a shear pin?
A shear pin is designed to intentionally break under excessive torque or impact, thereby protecting more expensive and critical components of the outboard motor's lower unit, such as gears and drive shafts.
What does 'Size 21' refer to on this shear pin?
The 'Size 21' designation typically refers to a specific dimensional standard or the engine horsepower range and propeller shaft it is designed to fit, ensuring the correct fracture point is maintained.
How many shear pins are included in this product?
This product contains a pack of five (5) shear pins, providing spares for multiple replacements or replacements for consecutive incidents.
Are these shear pins compatible with all outboard brands?
While this specific shear pin is a standard size, compatibility can vary by outboard motor manufacturer and model. Always consult your outboard's service manual for the correct shear pin size and rating.
What is the recommended procedure for replacing a shear pin?
Replacement typically involves removing the propeller, driving out the old pin (if still partially intact), inserting the new pin, and then reinstalling the propeller. Always refer to your specific outboard motor's manual for detailed instructions.
