Worldwide Shipping
New 4B4278 Washer Replacement suitable for Caterpillar Equipment
Exact Fit Guarantee
This part is guaranteed to fit your machine.
Wrong Part?
We'll overnight correct part at no cost to you.
Secure Checkout
•
Trusted Since 2012
Details
Description for 4B4278 Washer
â–¶Specification for 4B4278 Washer
â–¶Exact Fit Guarantee for 4B4278 Washer
â–¶Reviews
Customer Reviews
Rapid response! Excellent service!
Excelente atencion y refacciones de calidad
I would give 5 stars but my first time ordering from here and using aftermarket parts. The price is reasonable comparing to original Cat parts and the customer support is great and hoping to do more business with them
He was a great help with ordering and refunding the sales tax,
Steven & Propel Parts were a huge help! We were able to place a large order and get it shipped out same day to avoid a line down situation for a customer due to a lost component. The order was even submitted after the 3pm cutoff for same day shipments and we got it the next morning!
Received 15 items within 5 days from placing order !
Great. !
Great service affordable parts
perfect service
Great place for Cat parts!
Had some shipping difficulties, but everything was made right. Parts were perfect and an excellent price. Thanks!
Will definitely use regularly!
Shipped the exact product we were looking for. Prompt Customer Service. Seamless cross-border shipping
Product Questions
Frequently Asked Questions
What is the function of the 4B4278 washer in Caterpillar equipment?
The 4B4278 washer plays a critical role in distributing load evenly across fasteners, reducing vibration, and preventing damage to connected components. It helps maintain secure assembly in heavy-duty machinery, especially in high-pressure or high-vibration environments.
Is this 4B4278 washer compatible with my Caterpillar machine?
This washer is designed to fit a range of Caterpillar equipment models, but compatibility can vary depending on your specific machine and application.
- Check your equipment manual for part number confirmation
- Compare dimensions and specifications before purchasing
If you are still unsure, reach out to Propel Parts, our team will be happy to help you verify if this part fits your equipment.
Is this washer durable enough for heavy-duty applications?
Yes, this is a premium aftermarket washer built to handle demanding conditions. It is engineered to withstand pressure, vibration, and wear, making it suitable for construction, mining, and industrial machinery. It meets or exceeds OEM specifications for performance and reliability.
When should I replace the 4B4278 washer?
You should consider replacing the washer if you notice:
- Signs of wear, corrosion, or deformation
- Loose fasteners or recurring loosening issues
- Reduced clamping force in assemblies
Regular inspection during maintenance cycles helps prevent larger mechanical failures.
Can I use this washer with other fastening components?
Yes, the 4B4278 washer is designed to work alongside bolts, nuts, and other fastening components in Caterpillar systems. For best results, always pair it with compatible hardware that meets or exceeds OEM expectations to ensure optimal performance and safety.
Where can I find similar fastening and hardware components?
For related parts, you can explore our heavy equipment fasteners category to find washers, bolts, and other essential components designed for durability and performance.
Does this washer meet industry standards?
Yes, this is a high-quality aftermarket component that meets OEM specifications. It is manufactured with precision to ensure proper fitment, load distribution, and long-lasting performance in demanding applications.
Shipping | Returns
Shipping
We know equipment downtime costs money, so fast and reliable shipping is a priority at Propel Parts. Orders placed on weekdays before 3:00 PM ET typically ship the same day, with expedited delivery options available for many locations when time is critical.
We ship across the U.S., Canada, and over 130 countries worldwide, helping customers keep machines running wherever they operate. Available shipping methods and delivery estimates are shown at checkout so you can select the option that best fits your timeline.
Tracking information is emailed within 24–48 hours after your order is processed, giving you full visibility from dispatch to delivery and peace of mind that your parts are on the way.
Easy Returns
Our refund policy is simple. We offer a 30-day, no-hassle return policy, and we make every effort to provide the best service and highest-quality parts possible. If you’re not fully satisfied with your purchase, you may return it within 30 days for a refund. Full details are available on our Returns Policy page.
Warranty
Buy with confidence. All parts from Propel Parts are covered against material or manufacturer defects for 12 months from the original invoice date. We stand behind every part we sell, so you can count on reliable performance and dependable support. Full details are available on our Warranty Policy page.
Exact Fit Guarantee
Exact Fit Guarantee®
The right part — or we'll make it right.
Order Normally
Know your part number?
Simply place your order.
Not Sure?
Place your order, then send us your serial number before it ships.
We'll verify fit.
We Make It Right
Wrong part? We'll make it right.Fast. At our expense.