NAPA 25-9470 V-Belt | Mercury Marine Cross-Reference
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NAPA 25-9470 V-Belt | Mercury Marine Cross-Reference
Part Number: 25-9470 (NAPA belt reference)
Type: Cogged Accessory V-Belt
Section: HC50
Effective Length: 47 in. / 1,194 mm
Outside Circumference: approx. 47.3–47.6 in. (varies by manufacturer convention)
Top Width: approx. 0.47–0.53 in. / 12 mm
Construction: Notched/cogged for flexibility and pulley grip
Material: EPDM with polyester cord (Gates 9470 reference data)
Standard: Meets SAE J636C (Gates 9470 reference data)
Weight: approx. 300 g
What This Part Is
25-9470 is a NAPA belt catalog number, not a Mercury Marine OEM part number. It belongs to the well-established 9470 belt family and is cross-referenced to Gates 9470 and Dayco 17470. Mercury Marine legacy belt numbers 2B209, 511P84, 5F1111, 960470, and AP45 are all published cross-references to the same belt family.
This belt is best matched by confirming the existing belt’s part number and measured dimensions rather than selecting by engine brand alone, as several Mercury cross-reference numbers may span different engine or accessory arrangements.
Compatible Applications
Match by the original belt number, pulley layout, belt length, belt width, and accessory-drive configuration. V-belt fitment varies by engine model, alternator bracket, raw-water pump setup, power steering, and accessory configuration.
- Marine accessory drive applications requiring an HC50 / 47-inch cogged V-belt
- Applications where existing belt is stamped or labeled with one of the Mercury Marine cross-reference numbers: 2B209, 511P84, 5F1111, 960470, or AP45
- MerCruiser applications cross-referencing belt number 960470
- Any application where Gates 9470 or Dayco 17470 is the specified replacement
Always confirm the existing belt’s number and dimensions before ordering. A belt close in length can still be incorrect if the section, top width, or pulley groove width does not match.
When to Replace
- Cracking between the cogs or ribs
- Glazed or hardened sidewalls
- Fraying or exposed reinforcement cords
- Excessive stretching or belt no longer tensioning correctly
- Persistent belt squeal after proper adjustment
- Oil or coolant contamination
- Visible chunking or missing material
- Servicing related pulleys, alternator bracket, or accessory-drive components
Installation Notes
- Compare the old belt’s part number, section, and outside circumference to the replacement before installation
- Inspect all pulleys for rust, sharp edges, wobble, misalignment, or worn grooves before installing the new belt
- Set tension per the applicable engine service manual and recheck after the engine has run
- Do not force the belt over pulleys using tools — this can damage the internal cord structure
- For older marine accessory-drive setups, confirm the pulley groove matches the belt section before installation
Part Number Cross-Reference
- NAPA: 25-9470
- Gates: 9470 / 87019470
- Dayco: 17470
- Goodyear: 17470
- Metric reference: 13A1195 / 13 × 1195 mm
- Mercury Marine cross-references: 2B209, 511P84, 5F1111, 960470, AP45
Technical FAQ
Q: Is 25-9470 a Mercury OEM part number?
A: No. 25-9470 is a NAPA belt catalog number. Mercury Marine’s own legacy part numbers for this belt size include 2B209, 511P84, 5F1111, 960470, and AP45. If your engine’s belt carries one of those numbers, 25-9470 is the established replacement reference.
Q: What is the Gates equivalent for this belt?
A: Gates 9470. Gates specifies it with a 47 in. effective length, 47.61 in. outside circumference, 0.47 in. top width, and HC50 section — notched EPDM construction meeting SAE J636C.
Q: How do I confirm this belt fits my engine?
A: The safest method is to check the number stamped or printed on the existing belt and verify it matches one of the cross-references above. Also measure the outside circumference and top width of the old belt if the number is worn off. A belt that is close in length can still be wrong if the section or groove width does not match.
Parts Desk Insights
Best use case: Order 25-9470 when you have confirmed the original belt carries one of the Mercury Marine cross-reference numbers (2B209, 511P84, 5F1111, 960470, AP45), or when Gates 9470 or Dayco 17470 is the specified replacement for the accessory-drive application.
Common issues: The most frequent mistake is selecting this belt based on engine brand alone rather than confirming the belt number and dimensions. Several Mercury cross-reference numbers in the 9470 family span different engine configurations, so the number on the old belt remains the most reliable check. Also verify the belt section and pulley groove match — a belt that looks right in length can still slip or wear prematurely if the groove profile is mismatched.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.
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