The Harley Davidson Bolt Size Chart is a pivotal tool for motorcycle enthusiasts and mechanics alike.
It provides detailed information on the various bolt sizes used in Harley Davidson motorcycles, streamlining the process of assembly, disassembly, and maintenance.
This chart ensures that you can undertake bike repairs and enhancements with confidence and accuracy.
Why Do You Need a Harley Davidson Bolt Size Chart?
A Harley Davidson bolt size chart is an essential tool for any motorcycle enthusiast or mechanic working on a Harley Davidson bike.
It provides detailed information about the various bolt sizes used in the construction of these iconic motorcycles.
Understanding these sizes is critical when performing maintenance or modifications, as using the wrong size bolt could result in loose parts and structural instability.
However, a bolt size chart can aid in the identification and ordering of replacement parts, ensuring you secure the correct bolt for your specific model.
This invaluable chart helps you to maintain the integrity, performance, and safety of your Harley Davidson motorcycle.
Harley Davidson Bolt Size Chart
Here is the bolt size chart for Harley Davidson:
| Model/Production Year | Front Bolt | Rear Bolt |
| Softail (2007-17) | 12 mm | 12 mm |
| Dyna (2008-2017) | 8-19 mm | 8-19 mm |
| Fat Boy (2000-2017) | 10-19 mm | 10-19 mm |
| Road Glide (2017-22) | 19 mm | 19 mm |
| Touring (2008-2021) | 12 mm | 12 mm |
| Trike (2009-2021) | 12 mm | 11 mm |
What Are Some Of The Common Harley Davidson Bolt Sizes?
Harley-Davidson motorcycles are renowned for their distinctive design and precision engineering. Part of this meticulous construction involves a range of specific bolt sizes.
Familiarity with these sizes can be crucial for maintenance, repair, and customization of motorcycle. Generally, Harley-Davidson motorcycles use American standard sizes.
The most common bolt sizes include 1/4″-20, 5/16″-18, 3/8″-16, and 7/16″-14.
Where the numbers before the dash represent the diameter in inches, and the numbers following the dash indicate the thread count per inch.
For instance, a 1/4″-20 bolt has a diameter of 1/4 inch and 20 threads per inch. Larger components, such as the engine casing and frame, may require larger bolts, such as 1/2″-13 or 9/16″-12.
It’s important to note that using the correct bolt size is essential for safety and performance. Incorrect bolt sizes can lead to stripped threads, component damage, and even dangerous mechanical failures.
Types Of Bolts Harley Used IN Its Motorcycles
Harley-Davidson, renowned for its high-performance motorcycles, employs a variety of bolts in the construction of its vehicles.
The most common types include hex head bolts, used widely due to their robustness and ease of use.
Harley-Davidson also utilizes socket head bolts, prized for their high strength and ability to withstand significant torque.
Here are all the types of bolts that Harley used in its motorcycle lineup:
1. Hex Bolts
Hex bolts, often utilized in Harley motorcycles, are characterized by their hexagonal head shape. Their robust and straightforward design is particularly suitable for heavy-duty fastening applications.
These bolts are typically made from high-grade steel to withstand the demanding environment within a motorcycle engine.
Hex bolts offer superior grip and stability, preventing any unexpected loosening that could lead to engine damage.
With their six-sided head, they allow for easy tightening and loosening, making them a preferred choice for areas requiring regular maintenance.
2. Torx Bolts
Torx bolts, often referred to as “star bolts,” are a common sight in Harley Davidson motorcycles.
They are characterized by a six-point star-shaped pattern and are known for their high torque transmission capabilities.
It allows for better control and less chance of slippage when servicing or repairing the motorcycle.
Torx bolts are especially resistant to wear and tear, even after repeated use, making them an excellent choice for rugged conditions.
3. Allen Head Bolts
Allen Head Bolts are a crucial component often found in Harley-Davidson motorcycles.
They are characterized by a hexagonal recess in the head, requiring the use of an Allen wrench or hex key for installation or removal.
This design provides a clean look and a high degree of control while fastening, reducing the risk of damage or stripping.
Allen Head Bolts are typically used in places where the bolt head needs to be flush with the surrounding surface or where space is at a premium.
How Can You Replace Bolts On Your Harley?
When replacing bolts on your Harley, it’s crucial to follow a detailed, step-by-step process to ensure safety and functionality.
Here’s a guide to help you.
1. Identify Type of Bolts
Before starting, determine the type of bolts on your Harley. The most common types are hex, buttons, sockets, and flanged bolts.
2. Buy Replacement Bolts
Purchase replacement bolts of the same type and size. Harley Davidson dealerships or motorbike equipment stores should stock these.
3. Gather Tools
You’ll need a socket wrench or hex key that fits the bolts, a torque wrench for correct bolt tightening, and possibly a thread-locking fluid.
4. Remove Old Bolts
Loosen the bolts by turning the wrench counter-clockwise, and then remove them fully. Keep track of where each bolt came from; it can be useful for reassembly.
5. Install New Bolts
Place the new bolt in the hole and begin tightening by hand to avoid cross-threading. Once it’s firm, use your wrench to finish tightening.
6. Torque to Specification
Refer to your Harley’s manual for the correct torque specification. Use the torque wrench to tighten to this specification.
7. Apply Thread-Locker
If your manual recommends it, apply thread-locking fluid to the bolts to prevent them from loosening due to vibration.
8. Check Your Work
Double-check each bolt to ensure it’s been tightened to the correct spec.
Remember, if ever in doubt, it’s always best to take your Harley to a professional to ensure the job is done correctly and safely.
What Size Bolt Holds The Seat On a Harley Davidson?
The size of the bolt that holds the seat on a Harley Davidson can vary depending on the model and year of the motorcycle.
However, for many models, it’s typically a 1/4″-20 bolt, which refers to a 1/4 inch diameter bolt with 20 threads per inch.
Be sure to check your specific motorcycle’s manual or consult with a Harley Davidson dealer to ensure you have the correct bolt size for your seat.
What Size Torx Does Harley Use?
Harley-Davidson motorcycles primarily use Torx bolts, a type of fastener that provides a higher torque operation than standard hex bolts.
The most commonly used sizes on a Harley tend to be T27 and T45.
Do Harleys Use Metric Bolts?
Primarily, the company has been using imperial bolts in its production line.
However, with the advent of more modern designs and international production processes, it’s possible that they may incorporate metric bolts in some models.
This transition may be primarily seen in models produced for international markets, where the metric system is more universally adopted.
Talha Younas, the brains behind the influential motorcycle-focused website, TwoWheller.com, is a dedicated and passionate advocate for biking culture. Born and raised in a family of motorcycle enthusiasts, his love for two-wheeled transportation was ignited at an early age. His commitment to providing in-depth reviews and helpful tips for riders has established him as a respected figure in the motorcycle community.
