Quicksilver Screw 29081 | 7/16-14 × 1-1/4 in. | Anodic Plate to Gear Housing | Mercury MerCruiser OEM
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Quicksilver OEM Screw — Part No. 29081 / 10-29081
- Part Number: 29081
- Service Format: 10-29081
- Supersedes: 57900 → 29081 (current)
- Brand: Quicksilver (Genuine Mercury Marine OEM)
- Type: OEM Mounting Screw
- Thread: 7/16-14 UNC (coarse thread)
- Dimensions: 0.437 in. diameter × 1.250 in. / 31.75 mm long
- Thread Pitch: 14 TPI / approx. 1.81 mm
- GTIN / UPC: 745061133297
- System: Lower Unit / Gear Housing — anodic plate mounting and related Mercury and MerCruiser assemblies
What This Part Does
This genuine OEM screw secures the anodic plate to the gear housing on compatible Mercury and MerCruiser assemblies. The anodic plate (sacrificial anode) protects the gear housing and surrounding metal from galvanic corrosion in salt and brackish water — the mounting screw must be in good condition to keep the anode firmly seated and electrically connected to the housing it protects.
Beyond the anodic plate application, 29081 appears across a broad range of legacy Mercury and MerCruiser assemblies. Always confirm the exact diagram position and assembly for your engine or drive serial number — this screw’s dimensions may match other assemblies where a different part number is specified.
Compatible Applications
- Anodic plate to gear housing — Bravo X One / Two / Three sterndrive assemblies
- TRS / TR sterndrive gear housing hardware
- Mercury Mark 75A / 78 / 78A outboard assemblies
- Merc 200 / Merc 600 outboard assemblies
- MerCruiser 300 Tempest GM 350 V8
- MerCruiser 330 GM 454 V8
- MerCruiser 370 / 400 / 440 TRS GM 454 V8
- MerCruiser 460 TRS GM 482 V8
- MerCruiser 420 GM 454 V8
- MerCruiser 425 GM 454 V8 / Gen V
- MerCruiser 465 GM 502 V8 / Gen V
- Any Mercury or MerCruiser assembly where the current diagram specifies 29081 / 10-29081
Confirm by engine or drive serial number and the current Mercury parts diagram before ordering — 29081 appears in multiple assembly contexts.
Superseded Part Numbers
- 57900 → 29081 (current active number)
- Service format: 10-29081
When to Replace
- Screw is corroded, stripped, or no longer holds torque
- Screw head is rounded or damaged and cannot be tightened correctly
- Anodic plate is being replaced during routine anode service
- Gear housing hardware is being renewed during lower-unit service
- Original fastener is missing or was previously replaced with incorrect hardware
Installation Notes
- Confirm the thread is 7/16-14 UNC and the length is 1.250 in. before installing
- Clean the threaded bore in the gear housing before fitting the new screw
- Thread the screw in by hand first to avoid cross-threading
- Tighten to the torque specification in the Mercury service manual for the specific assembly
- When installing an anodic plate, ensure the plate seats flush and makes full metal-to-metal contact for effective corrosion protection
- Inspect the anode itself during any gear housing service — replace the anode if more than 50% consumed
Related Products
Parts Desk Insights
The anodic plate application is the most practical reason to have 29081 on hand — anode replacement is routine scheduled maintenance on any saltwater or brackish-water sterndrive, and the mounting screw corrodes alongside the anode it secures. Replacing the screw at each anode service costs almost nothing and avoids a seized or rounded fastener the next time the anode comes due. The superseded number 57900 may still appear on older diagrams — 29081 is the correct current replacement. Because this screw appears across many different Mercury assemblies, confirm by diagram rather than by engine family alone.
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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