Mercury Quicksilver OEM Marine Nut 879194337 | 11-879194337 | Replaces 853722023 | Clamp Bracket Gear Housing Swivel Bracket

Mercury Quicksilver OEM Marine Nut — Part 879194337

• Part Number: 879194337
• Full Catalog Number: 11-879194337
• Brand: Mercury Marine / Quicksilver (Genuine OEM)
• Official Product Type: Hardware & Fasteners — Nut
• System: Multi-application structural fastener used in clamp bracket, swivel bracket, gear housing / driveshaft housing, power-tilt bracket, and jet-unit assemblies
• Replaces: 853722023 / 11-853722023 (earlier Mercury nut)
• GTIN / UPC: 745061627017
• Weight: approx. 0.01 kg

Multi-application fastener — confirm by part number and diagram position: 879194337 is used across several different outboard assemblies on multiple engine families. The same OEM nut number can appear on a clamp bracket, a driveshaft housing, and a jet unit on different models. Always confirm the correct quantity and position from the serial-number-specific Mercury parts diagram for the exact assembly being serviced.

What It Is

The 879194337 / 11-879194337 is a genuine OEM Mercury and Mariner outboard mounting nut used across multiple structural assemblies on selected small and mid-range outboards. It supersedes earlier Mercury nut reference 853722023 / 11-853722023. Depending on the engine and assembly, the required quantity varies — for example, selected 9.9 HP gear-housing diagrams specify four 879194337 nuts, while some 8 HP / 9.9 HP clamp-bracket assemblies specify two.

Compatible Applications

Confirm the correct quantity and assembly position from the serial-number-specific Mercury or Mariner parts diagram before ordering. Engine model alone does not determine quantity or location for this multi-application fastener.

• Mercury / Mariner 8 HP FourStroke — 209 cc — clamp bracket, gear housing, swivel bracket, and selected structural assemblies
• Mercury / Mariner 9.9 HP FourStroke — 209 cc — clamp bracket, gear housing / driveshaft housing (4 nuts on applicable diagrams), power-tilt bracket
• Mercury / Mariner 9.9 HP 2-cylinder 2-stroke — selected structural assemblies
• Mercury / Mariner 15 HP 2-stroke — selected structural assemblies
• Mercury / Mariner 18 HP 2-stroke — selected structural assemblies
• Mercury 15 HP SeaPro FourStroke
• Mercury 20 HP FourStroke
• Mercury 25 HP SeaPro FourStroke
• Mercury 25 HP EFI Jet FourStroke — jet unit hardware

Not sure of the quantity or location? Send us your Mercury or Mariner engine serial number and the assembly being serviced before ordering.

Commonly Used With

Parts diagrams show 879194337 used alongside the following components depending on the assembly. These are sold separately:

• 8M0135942 — Washer (used with this nut in gear-housing / driveshaft-housing applications)
• 16192 — Washer (used with this nut in clamp-bracket applications)
• 879194310 — Bolt (used in applicable clamp-bracket assemblies)
• 879194302 — Stud bolt
• 879194254 — Bolt
• 879194342 — Washer

Part Numbers

• 879194337 — Current Mercury Marine OEM part number
• 11-879194337 — Full Mercury / Quicksilver catalog number
• 853722023 / 11-853722023 — Earlier Mercury nut; superseded by 879194337

When to Replace

Replace the nut when:

• Threads are damaged, stripped, or stretched
• Corrosion has weakened or seized the fastener
• The flats are rounded and the nut can no longer be torqued correctly
• The nut no longer threads smoothly onto the mating bolt or stud
• The original hardware is missing from the assembly
• The applicable Mercury service procedure specifies fastener replacement during disassembly

If a nut was seized or heavily corroded on removal, inspect the mating bolt or stud threads for damage before installing the replacement.

Installation Notes

• Confirm the correct quantity from the parts diagram for the exact serial number and assembly location before ordering — required quantity varies from two to four depending on the application
• Inspect the mating bolt or stud threads and replace any that are corroded or damaged
• Replace related washers (8M0135942 or 16192, depending on application) at the same time if there is any sign of corrosion or deformation
• Use the torque specification from the applicable Mercury service manual for the specific assembly — do not assume the same torque applies at every location where 879194337 is used
• Apply thread treatment (anti-seize or locking compound) only where specified by the service procedure for the assembly

Technical FAQ

Q: How many 879194337 nuts do I need?
It depends on the assembly and engine. Gear-housing / driveshaft-housing diagrams for the 9.9 HP FourStroke typically specify four, while clamp-bracket assemblies on the 8 HP / 9.9 HP typically specify two. Confirm the required quantity from the serial-number-specific Mercury parts diagram for the exact assembly being serviced.

Q: Does 879194337 replace 853722023?
Yes. 879194337 / 11-879194337 is the current OEM part number and directly supersedes earlier Mercury nut 853722023 / 11-853722023. Order 879194337.

Q: Can I use a standard metric nut instead of the OEM 879194337?
Mercury specifies 879194337 for these structural assemblies based on material grade, corrosion resistance, and torque requirements for a marine environment. Using a non-OEM substitute in structural bracket and housing applications may not meet the corrosion resistance or strength requirements. The OEM part is recommended for these applications.

Parts Desk Insights

The most important thing with 879194337 is that it is used in several completely different assemblies across multiple outboard families. The OEM nut number alone does not tell you where it goes or how many are needed — the parts diagram for the specific assembly is the only reliable source for both. The most common ordering issue is customers specifying only the engine model without identifying the assembly, which makes it impossible to confirm the correct quantity. Always ask which assembly the nut is coming from when quantity is not clear from the order.