Shear pins are critical components in Ariens snowblowers, designed to protect the auger and gearbox from damage by breaking under excessive load. Selecting the correct shear pin size is essential for the safe and efficient operation of your snowblower.
This post guide provides a detailed chart of shear pin sizes corresponding to various Ariens snowblower models. Let’s jump in.
Ariens Shear Pin Size Chart
| Model Series | Shear Pin Size | Thread Size | OEM Part Number(s) | Notes |
|---|---|---|---|---|
| Compact Series | 1-9/16″ | 1/4″-20 | 532005, 53200500 | Common in 20″ to 24″ models |
| Deluxe Series | 2″ | 5/16″-18 | 51001500 | Used in mid-size 24″ to 28″ snowblowers |
| Platinum Series | 2″ | 5/16″-18 | 72100600 | For premium models with larger augers |
| Professional Series | 2″ | 5/16″-18 | 72100600 | Designed for high-power, heavy-duty use |
| Sno-Tek Series | 1-9/16″ | 1/4″-20 | 532005, 53200500 | Lightweight shear pin for basic consumer-grade machines |
| Classic Series | 1-3/4″ | 1/4″-20 | 510016, 51001600 | Found in older, smaller frame models |
| Path-Pro Series | 1-7/16″ | 1/4″-20 | 532005, 53200500 | Compact shear pin for single-stage units |
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Understanding Shear Pin Specifications
- Length: Measured from end to end, typically ranging from 1-7/16″ to 2″.
- Thread Size: Indicates the diameter and pitch of the threaded portion, commonly 1/4″ or 5/16″-18.
- Material: Shear pins are made of soft metal to ensure they break under stress, protecting the snowblower’s internal components.
Importance of Using Correct Shear Pins
Using the appropriate shear pin ensures:
- Safety: Prevents damage to the auger and gearbox.
- Performance: Maintains optimal snowblower functionality.
- Longevity: Extends the lifespan of the equipment.
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FAQ
Are there different sizes of shear pins?
Yes, shear pins come in various lengths, diameters, and thread sizes. Common sizes include:
- 1/4″-20 thread, around 1.5″ to 1.75″ length
- 5/16″-18 thread, around 2″ length
The size depends on the make and model of your snowblower and its auger shaft design.
Can you use any shear pin on a snowblower?
No, you should only use manufacturer-specified shear pins. Using the wrong size or material can lead to:
- Ineffective protection for your gearbox
- Damage to the auger or housing
- Safety risks during operation
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How to replace shear pin on an Ariens snowblower?
Steps to replace:
- Turn off engine and disconnect spark plug for safety.
- Locate the broken shear pin on the auger shaft.
- Remove the damaged pin using pliers or a wrench.
- Align auger hole with shaft hole.
- Insert the new shear pin and tighten the nut (if it’s a bolt-style pin).
- Reconnect spark plug and test operation briefly.
Can I use a grade 8 bolt as a shear bolt?
No. Grade 8 bolts are hardened and strong, they won’t shear under stress. This defeats the purpose of a shear pin, which is to break and protect your snowblower. Always use soft metal OEM shear pins.
How to size a shear pin?
To size a shear pin:
- Measure the diameter of the old pin (1/4″, 5/16″, etc.).
- Measure the length from end to end.
- Check thread pitch if it’s a threaded pin (e.g., 1/4″-20).
- Consult the manual or match with the OEM part number.
What are the different sizes of straight pins?
Straight pins (non-threaded) vary in:
- Diameter: from 1/8″ to 1/2″
- Length: typically 1″ to 3″
- Material: brass, steel, or zinc-coated
- These are more common in general mechanical or alignment applications, less so in snowblowers.
What is the difference between single and double shear pins?
- Single shear pin: breaks at one shear plane (one point of load).
- Double shear pin: breaks at two shear planes, offering more resistance to failure.
- Snowblowers usually use single shear configurations.
What is the difference between a shear pin and a shear bolt?
- Shear Pin: Usually smooth, non-threaded or only partially threaded, made to snap cleanly.
- Shear Bolt: Threaded like a regular bolt, but made of soft metal to shear under load.
Both serve the same purpose but differ in design and installation.
Final Words
Selecting the correct shear pin size for your Ariens snowblower is crucial for safe and efficient operation. Regular inspection and timely replacement of shear pins can prevent costly repairs and downtime during the snow season.
