Gates Hi-Power II V-Belt — GATB40
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You have 30 days to request a return. All sale items are final sale.
The Gates Hi-Power II GATB40 is a classical wrapped V-belt built for reliable power transmission in automotive and marine auxiliary drive systems. The wrapped construction protects the cord and rubber body from contamination and abrasion, making it well suited to environments where oil mist, moisture, or debris are present. It operates in the B-section profile with a 40-inch outside circumference (1016 mm) and a 21/32-inch top width.
Key Features
- Gates Hi-Power II classical wrapped V-belt
- B-section cross-section (21/32" top width)
- Outside circumference: 40 inches / 1016 mm
- Wrapped fabric cover for contamination and abrasion resistance
- High-strength polyester cord for low stretch and consistent tension
- Oil-, heat-, ozone- and weather-resistant rubber compound
- Meets or exceeds RMA/MPTA classical V-belt standards
Application Compatibility
Designed for single-groove B-section pulley systems on automotive engines, marine auxiliary drives, and industrial equipment. Common applications include alternator, raw-water pump, circulating-water pump, power steering, and air conditioning drives that specify a B40 or equivalent classical V-belt.
Fitment Notice
Confirm the original belt cross-section, outside circumference, and pulley groove profile before ordering. A B-section belt will not seat correctly in an A-section or C-section groove. Marine-engine applications can vary by engine model, accessory package, pulley arrangement, and serial-number range.
When This Part Needs Replacement
Replace the belt when it shows cracking, fraying, glazing, missing material, oil saturation, or persistent squealing. A belt that rides low in the pulley groove or requires repeated tension adjustment is likely worn and should be replaced before it causes accessory failure.
Installation Notes
Inspect pulleys for wear, corrosion, misalignment, and contamination before fitting the new belt. Route the belt without forcing it over pulley flanges, then tension to the equipment manufacturer's specification. Rotate the drive by hand to confirm correct seating and recheck tension after the initial run-in period.
Alternate Part Numbers
- Gates part number: B40
- Distributor SKU: GATB40
Parts Desk Insights
The Hi-Power II wrapped construction is the preferred choice when the drive is exposed to oil mist, moisture, or abrasive particles — conditions common in marine engine compartments. The fabric cover adds durability that raw-edge or notched belts cannot match in contaminated environments. If your application runs in a clean, dry environment and prioritizes flexibility and heat dissipation over contamination resistance, a notched belt such as the Automotive V-Belt GAT9370 or the Gates Automotive XL High Capacity V-Belt 7440 may be a better fit. For tensioners, pulleys, and related drive components, browse our Belts, Hoses & Clamps collection.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.