Mercury MerCruiser Stainless Steel Nut 11-82671013 | 3/8"-24 Fine Thread
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Mercury MerCruiser Stainless Steel Nut — Part No. 11-82671013
This is the genuine Mercury Marine OEM stainless steel nut listed under part number 11-82671013. A 3/8"-24 fine-thread hex nut in marine-grade stainless steel, it is used where the Mercury or MerCruiser parts diagram specifically calls for this number. The fine-thread (24 TPI) specification is an important detail — it is not interchangeable with the more common 3/8"-16 coarse-thread nut, and substituting the wrong thread pitch will damage the mating fastener or fail to clamp the assembly correctly.
Part Details
- Part Number: 11-82671013
- Base Number: 82671013
- Thread Size: 3/8"-24 (fine thread, 24 TPI)
- Material: Stainless steel (marine-grade corrosion resistance)
- Type: Hex nut
- Type: Genuine Mercury Marine OEM fastener
Compatible Applications
- Use where the Mercury, MerCruiser, or Quicksilver parts diagram specifically calls for part number 11-82671013 or 82671013
- Confirm fitment by engine or drive serial number, assembly location, and current Mercury parts diagram before ordering
Always confirm by part number and diagram position. The 3/8"-24 fine-thread specification must match the mating fastener — do not substitute a 3/8"-16 coarse-thread nut.
Alternate & Superseded Part Numbers
- 11-82671013 — current Mercury/MerCruiser formatted number
- 82671013 — base part number
When to Replace
Replace this nut if it is corroded, rounded, stretched, cross-threaded, cracked, or missing. Also replace any time the fastener assembly is disassembled for service — particularly in saltwater or high-vibration environments where stainless fasteners can gall or corrode at the thread interface over time.
Installation Tips
- Confirm the thread pitch is 3/8"-24 fine thread before installation — do not mix with 3/8"-16 coarse-thread hardware
- Inspect the mating stud or bolt threads for corrosion, galling, or damage before installing the new nut
- Apply an appropriate anti-seize compound to stainless-on-stainless thread interfaces to prevent galling during installation and future removal
- Torque to the Mercury service specification for the specific assembly location
- Do not over-torque stainless fasteners — stainless steel is more prone to galling and thread damage than plated steel hardware
Technical FAQ
Q: What is the difference between 3/8"-24 and 3/8"-16?
A: Both are 3/8" diameter, but 3/8"-24 has 24 threads per inch (fine thread) while 3/8"-16 has 16 threads per inch (coarse thread). They are not interchangeable. Installing the wrong thread pitch will cross-thread and damage the mating fastener. Always confirm the thread pitch before ordering.
Q: Why use stainless steel instead of plated steel in marine applications?
A: Stainless steel offers significantly better corrosion resistance in saltwater and high-humidity marine environments. Mercury specifies stainless hardware at locations where corrosion resistance is a priority — particularly on external or exposed assemblies.
Q: Can I use anti-seize on stainless nuts?
A: Yes — and it is recommended for stainless-on-stainless thread interfaces. Stainless steel is prone to galling (thread welding under friction), which can make the nut impossible to remove without damage. Anti-seize prevents this and makes future service much easier.
Parts Desk Insights
Best use case: This nut is the right call when the parts diagram specifically calls for 11-82671013 and a stainless, fine-thread replacement is needed at that location. The 3/8"-24 fine-thread spec makes it application-specific — it’s not a general-purpose nut. It’s a low-cost part worth ordering ahead of any service that involves disassembling the assembly it belongs to, rather than discovering it’s missing or damaged mid-job.
Common issues: The most frequent problem is confusing 3/8"-24 fine thread with the more common 3/8"-16 coarse thread. They look nearly identical but are not interchangeable — installing the wrong pitch will damage the mating stud or bolt. The second common issue is galling during installation on stainless-on-stainless interfaces. Using anti-seize at assembly prevents this and makes future removal straightforward.
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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