Quicksilver 5/16-24 UNF Nut 29250 | Mercury MerCruiser OEM Powerhead & Throttle Hardware
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Quicksilver OEM 5/16-24 UNF Nut — Part No. 29250 / 11-29250
- Part Number: 29250
- Service Format: 11-29250
- Supersedes: 20461 → 29250 (shift-actuating lever nut); 46793 → 29250 (control/bracket nut)
- Brand: Quicksilver (Genuine Mercury Marine OEM)
- Type: OEM Mounting / Linkage Nut
- Thread: 5/16-24 UNF (fine thread)
- Nominal Thread Diameter: 0.3125 in. / 7.94 mm
- Thread Pitch: 24 TPI / approx. 1.06 mm
- GTIN / UPC: 745061133402
- Aftermarket Cross-Reference: GLM 19356
- System: Powerhead / Throttle Control / Linkage — broad Mercury outboard application
What This Part Does
This genuine OEM nut is used across several distinct Mercury outboard assemblies, most notably as a powerhead stud nut and as the throttle-control bracket nut. Mercury diagrams also show it securing shift-actuating lever hardware and remote-control bracket components.
Critical thread note: This is a 5/16-24 UNF fine-thread nut. Do not substitute a visually similar 5/16-18 UNC coarse-thread nut — it will not engage the stud or screw threads correctly and risks thread damage. Match by OEM part number and confirm the thread specification before ordering.
Compatible Applications
Powerhead Stud Nut:
- Selected legacy Mercury 20 HP outboards — powerhead stud nut (multiple nuts per assembly)
- Selected Mercury 200-series outboards — powerhead stud applications
Throttle Control Bracket:
- Selected Mercury outboards — throttle-control bracket screw nut (typically 2 nuts per assembly)
Shift & Control Hardware:
- Shift-actuating lever nut — supersedes legacy part 20461
- Remote-control / bracket hardware — supersedes legacy part 46793
- Any Mercury or MerCruiser assembly where the current diagram specifies 29250 / 11-29250
Confirm the exact diagram position, required quantity, and serial number for your engine before ordering.
Superseded Part Numbers
- 20461 → 29250 (shift-actuating lever nut)
- 46793 → 29250 (control/bracket nut)
- Service format: 11-29250
- Aftermarket: GLM 19356
When to Replace
- Threads are stripped, distorted, or will not engage smoothly
- Flats are rounded and the nut can no longer be torqued correctly
- Corrosion is present on threads or bearing face
- Mating stud or screw has been serviced or replaced
- Existing mounting hardware damaged during disassembly
Installation Notes
- Confirm thread is 5/16-24 UNF before fitting — do not use a 5/16-18 coarse-thread nut
- Inspect mating stud or screw threads for corrosion or damage before assembly
- Thread the nut on by hand first to avoid cross-threading the fine-pitch thread
- Tighten to the torque specification in the Mercury service manual for the specific assembly — torque values differ between powerhead stud, throttle-control bracket, and linkage applications
- Confirm correct washers or adjacent hardware per the Mercury parts diagram before final assembly
Related Products
Parts Desk Insights
29250 is a good example of a Mercury nut that turns up in multiple unrelated assemblies — powerhead, throttle bracket, shift lever, and remote control — which means it’s useful stock for any shop doing general Mercury outboard service. The fine 5/16-24 thread is the detail that trips people up most often: a 5/16-18 coarse nut looks the same and will start threading before binding, which can damage the stud. If the old number on your diagram is 20461 or 46793, 29250 is the correct current replacement. Torque specs vary by assembly, so look up the value for the specific location being worked on rather than applying a generic torque.
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
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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.
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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:
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