Mercury MerCruiser Quicksilver — Hex Screw .375-16 × 1.250 in. — 37612
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Mercury MerCruiser Quicksilver Hex Screw 37612 | 3/8-16 × 1-1/4 in.
The Mercury MerCruiser Quicksilver 37612 is a genuine OEM 3/8-16 × 1.250 in. hex screw used in multiple MerCruiser engine assemblies. Verified applications include engine-mounting brackets and flywheel housings, where the screw is installed with the specified Mercury locking hardware.
Key Features
- Genuine Mercury Marine OEM fastener
- Part number: 37612
- Full service number: 10-37612
- Thread: 3/8-16 UNC
- Length: 1.250 in. / 31.8 mm
- GTIN: 745061139718
- Active Mercury service part
Compatible Applications
Verified uses include select MerCruiser:
- 3.0L / 181 CID L4
- 4.3L / 262 CID V6
- 5.0L / 305 V8
- 5.7L / 350 V8
- 8.2L / 502 V8
- Additional MerCruiser engine-mount and flywheel-housing applications where 37612 is specified
Serial Number Fitment Notice
Confirm the engine serial number and diagram position before ordering. MerCruiser uses several 3/8-16 screws with different lengths in the same assemblies. For example, some 3.0L engines use 37612 through serial 1A348956, with a different-length fastener used afterward.
When This Part Needs Replacement
Replace the screw if the threads or hex head are damaged, corrosion is significant, or the fastener cannot achieve proper tightening. Inspect the mating threads and lockwasher whenever the mounting assembly is serviced.
Installation Notes
Install only in the factory position shown in the Mercury diagram. Engine-mount applications commonly pair 37612 with the 3/8 in. lockwasher 35048. Flywheel-housing assemblies may use several different fastener lengths, so keep each screw in its specified location.
Related Parts
- 35048 — 3/8 in. lockwasher
- 32132 — 3/8-16 × 1.750 in. screw
- 68101 — 3/8-16 × 1.375 in. screw
- 99322 — Flywheel-housing mount spacer
Alternate & Superseded Part Numbers
- 37612 — OEM part number
- 10-37612 — full Mercury service number
- No superseding number
Technical FAQ
What size is this screw?
3/8-16 UNC thread, 1.250 in. (31.8 mm) long, with a hex head.
Is 37612 the same as 10-37612?
Yes. 10-37612 is the full Mercury service number for the same part.
Does it fit every 3.0L MerCruiser?
No. Some 3.0L engines use 37612 only through serial 1A348956, so check your serial number and diagram first.
Parts Desk Insights
Best use: Replacing a damaged, corroded, or missing 3/8-16 × 1-1/4 in. screw in a MerCruiser engine-mount or flywheel-housing position that calls for 37612.
Most common mistake: Assuming all 3/8-16 screws in the same assembly are interchangeable. Similar MerCruiser screws can differ by only 1/8 or 1/2 inch, and the wrong length can bottom out or fail to fully engage the threads.
Sizing and fitment: Match the OEM number and diagram position, and confirm your engine serial number. If you are replacing the lockwasher at the same time, the matching 3/8 in. lockwasher is 35048.
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.
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.