Mercury MerCruiser 1/4-28 Hex Nut - 11-8267139
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The Mercury MerCruiser Quicksilver 11-8267139 is a genuine Mercury Marine OEM .250-28 hex nut used as diagram-specific fastening hardware across select MerCruiser engine, sterndrive, transom, intake, fuel, and throttle-related assemblies. This fine-thread nut is used where the Mercury/MerCruiser parts diagram calls for 8267139 / 11-8267139, helping secure light-to-medium engine and drive hardware in locations that require the correct OEM thread and hardware fit.
Key Features
- Genuine Mercury Marine factory OEM nut.
- Mercury/MerCruiser part number: 11-8267139.
- Manufacturer part number: 8267139.
- Official part label: NUT (.250-28).
- Thread specification: 1/4-28 fine thread.
- GTIN/UPC: 745061464575.
- Listed shipping dimensions: 0.75 in. L x 0.63 in. W x 0.50 in. H.
- Used in select MerCruiser engine, Bravo drive, transom, intake, throttle, fuel-line, and flame arrestor hardware locations where specified by diagram.
Application Compatibility
Common where-used application groups include select Mercury/MerCruiser engines, drives, and transom assemblies by serial number and diagram location, including:
- 3.0L GM 181 I/L4 applications
- 3.0L MPI EC applications
- 3.0L TKS Plus applications
- 4.3L Carb and MPI Alpha/Bravo applications
- 5.0L Carb and MPI Alpha/Bravo applications
- 5.7L Carb, MPI, Ski, and MIE applications
- 350 MAG MPI / Horizon / Black Scorpion applications
- 6.2L MPI / MX 6.2L MPI applications
- 377 MAG and 383 MAG Stroker applications
- 496 MAG and 496 MAG H.O. applications
- 8.1L Inboard Base and H.O. applications
- Bravo, Bravo One, Bravo Two, Bravo Three, Bravo X, Bravo XR, Bravo XZ, Hi Performance Transom, and Integrated Transom assemblies where specified
Use this nut only where the Mercury/MerCruiser parts diagram specifically calls for 11-8267139 / 8267139.
Serial Number Fitment Notice
Confirm fitment by engine or drive serial number, system diagram, thread requirement, and exact hardware location before ordering. Mercury uses many similar 1/4-inch nuts across fuel, throttle, flame arrestor, manifold, cooling, transom, and drive assemblies, and the correct part depends on the factory diagram location.
When This Part Needs Replacement
Replace this nut if the original fastener is missing, rounded, corroded, cross-threaded, stripped, stretched, or damaged during service. It should also be replaced if it no longer tightens properly on the mating stud or screw, or if the service manual calls for new fastening hardware during reassembly.
Installation Notes
Install this nut only in the exact location shown in the Mercury/MerCruiser diagram. Inspect the mating stud, screw, washer, bracket, linkage, flame arrestor base, throttle component, fuel-line clamp, or mounting surface while the hardware is apart. Do not force a damaged fine-thread nut onto a stud or screw. Follow the Mercury/MerCruiser service manual for the correct torque value and hardware order for the specific assembly.
Alternate/Superseded Part Numbers
- 11-8267139 ā Mercury/MerCruiser formatted part number
- 8267139 ā Manufacturer part number
- 28941 ā earlier Mercury reference; verify by serial number and diagram before substitution
Parts Desk Insight
Fine-thread hardware should be matched by part number and diagram location, not just by thread size. A generic 1/4-28 nut may not match the required height, finish, locking style, or service location, which matters on throttle, fuel, manifold, and transom hardware exposed to vibration.
Shipping: Ships same or next day for fast Canada wide shipping. ā
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3ā4 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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Important:
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