Mercury MerCruiser 11-21908 Genuine OEM Alpha Bravo .312-18” Cadmium Plated Nut

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  • Genuine OEM Mercury Quicksilver Parts
  • Alpha Bravo .312-18” Cadmium Plated Nut
  • Size: .312-18”
  • Finish: Cadmium Plated
  • Manufacturer: Mercury, Quiksilver, MerCruiser, Mariner
  • Part Number: 11-21908
  • Also Known As: Mercury MerCruiser 1121908
  • For use with:
MERC 115 - 115 (6 CYL.) 350 MAG EFI TOURN SKI - 350 MAG. EFI SKI (TBI) GM 350 V-8 1994-1996
4.3L/LX ALPHA/BRAVO (GEN II) - 4.3L (GEN II) (2 BBL.) GM 262 V-6 1996 500 EFI - 500 EFI
OUTBOARDS SEC G MISCELLANEOUS PARTS MANUAL - Exhaust / Cooling Systems and Extension Kits 230 HP/5.0L 260 HP/5.7L ENGINE - 5.0L MIE (4 BBL.) GM 305 V-8 1987-1995
575 SCI - 575 SCi 454/502 MPI MAG BRAVO (GEN VI) - 502 MAG. MPI BRAVO (GEN VI) GM 502 V-8
ACCESSORIES MERCRUISER VOLUME I - Exhaust / Cooling Systems and Extension Kits 7.4L MPI (MIE) (GEN VI-L29) - 7.4L MPI MIE (L29) GEN. VI GM 454 V-8 1998-2000
500 HP 8.2L (502 CI) ENGINE - 500 (GEN. V) GM 502 V-8 1994-1995 MERC 90 - 90 (6 CYL.)
5.7LX TBI BRAV0 350 TBI MAG ALPHA (EFI) - 350 MAG. ALPHA EFI(GEN+) GM 350 V-8 1997 502 MAGNUM BRAVO ENGINE (GEN V) - 502 MAG. BRAVO (GEN. V) GM 502 V-8 1992-1993
215 ENGINE - 215 (4 BBL.) FORD 302 V-8 1970-1972 525 EFI - 525 EFI
MARINER 90 - 90 (6 CYL.) 898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 250 1977
MERC 50 - 500, 50 383 MAG 4V MIE REMAN - 383 Mag Inboard 4V
7.4L (MIE) HURTH/BORG WARNER (GEN V) - 7.4L MIE (LH) GEN. V GM 454 V-8 1992-1996 5.0L/5.7L ALPHA/BRAVO GEN+ - 5.0L (2 BBL.) GM 305 V-8 1998-2001
230 HP/260 HP INBOARD ENGINE (GM) - 230 MIE (4 BBL.) GM 305 V-8 1981-1986 MERC 650 (3 CYLINDER) - 650 (3 CYL.)
454/502 MPI MAG BRAVO (GEN VI) - 454 MAG MPI BRAVO (GEN VI) GM 454 V-8 1998 4.3 LX/LXH ALPHA AND BRAVO (GEN +) - 4.3LX (GEN +) (2 BBL.) GM 262 V-6 1996-1997
45 HP - 45 (4 CYL.) MIE 454 MAG MPI SKI (GEN VI) - 454 MAG. MPI (SKI) GEN. VI GM 454 V-8 1996-1997
5.7L COMPETITION SKI ENGINE - 5.7L COMPETITION SKI GM 350 V-8 1997 OUTBOARDS SEC G MISCELLANEOUS PARTS MANUAL - Trim / Tilt / Lift Systems and Components
MIE 7.4 EFI HURTH/BORG WARNER -LH ONLY - 7.4L MIE MPI (LH) GEN. V GM 454 V-8 1995-1996 5.0L/5.7L ALPHA/BRAVO GEN+ - 5.7L (2 BBL.) GM 350 V-8 1998-2001
454 MAGNUM BRAVO ENGINE - 454 MAG. BRAVO GM 454 V-8 1988-1992 MIE 5.7L INBOARD - 5.7L MIE GM 350 V-8 1996
465 HP ENGINE - 465 (GEN. V) GM 502 V-8 1992-1994 45/50 HP - 45 (4 CYL.)
SCORPION 377 STERNDRIVE - Scorpion 377 Sterndrive 45/50 HP - 50 (4 CYL.)
454/502 MPI MAG BRAVO (GEN VI) - 502 MAG MPI BRAVO (GEN VI) GM 502 V-8 1998 MARINER 80 - 80
5.0L / 5.7L EFI ALPHA/BRAVO (GEN +) ENGINE - 5.0L EFI GM 305 V-8 1999-2001 255 ENGINE - 255 MIE FORD 351 V-8 1973-1974
350 MAG MPI (GEN+)MIE - 350 MAG. MPI MIE (GEN+) GM 350 V-8 1998 MERC 1400EL-SS - 1400
MIE 7.4L HURTH/BORG WARNER (GEN IV) - 7.4L MIE (LH) GEN. VI GM 454 V-8 1996-1997 340 HP/7.4L W/BORG WARNER TRANS (GM) - 340 MIE W/B/W GM 454 V-8 1981-1987
5.0L / 5.7L EFI ALPHA/BRAVO (GEN +) ENGINE - 5.7L EFI GM 350 V-8 1999-2001 5.7L EFI (MIE)TBI (GEN+) - 5.7L EFI MIE GM 350 V-8 1997
MERC 1150 - 1150 5.7L INBOARD - 5.7L CARB MIE
115 HORSEPOWER - 115 (6 CYL.) II TR STERN DRIVE (2.00 RATIO) - II-TR 1973-1976
350 MAGNUM EFI/MP TOURN SKI - 350 MAG MPI SKI GM 350 V-8 1995-1996 350 MAGNUM TOURNAMENT SKI (CARB) - 350 MAG (SKI) GM 350 V-8 1997
898/200/228/230/260 HP R/MR/ALPHA ONE - 200 (2 BBL.) GM 305 V-81 1985-1986 350 MAG EFI TBI TOURN SKI (GEN+) - 350 MAG. EFI SKI (GEN+) GM 350 V-8 1996
7.4L 454 MAG BRAVO GEN V - 454 MAG. BRAVO (GEN. V) GM 454 V-8 1992-1994 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 165 1978-1981
500 CARB (502CID) 8.2L ENGINE (GEN +) - 500 (GEN. +) GM 502 V-8 1999 5.0L EFI ALPHA/BRAVO 5.7L EFI ALPHA/BRAVO (GEN +) ENGINE - 5.7L EFI GM 350 V-8 1998
600SC GEN IV & V ENGINE - 600 SC GEN IV & V GM 502 V-8 1991-1996 7.4 LX (EFI-MP) BRAVO - 7.4LX BRAVO (MPI)(GEN. V) GM 454 V-8 1996
5.7L INBOARD ENGINE - 5.7L MIE GM 350 V-8 1994-1995 4.3L CARB ALPHA/BRAVO - 4.3L CARB ALPHA/BRAVO
OUTBOARDS SEC A RIDE-GUIDE - Power Steering/Tiller Handles/ Shift Kits 35 HP - 35 (2 CYL.)
350 MAG TOURNAMENT SKI (CARB) - 350 MAG (SKI) GM 350 V-8 1991-1996 R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Sterndrive) 1983-1990
OUTBOARDS SEC G MISCELLANEOUS PARTS MANUAL - Electrical 600 SCI - 600 SCi
MERC 90 - 900, 90 215H AND 215E STERN DRIVE - 215H 1970
MARINER 115 - 115 (6 CYL.) 454/502 EFI MAG BRAVO (GEN V) - 454 EFI (GEN. V) GM 454 V-8 1994-1996
TRIM / TILT / LIFT SYSTEMS AND COMPONENTS - Trim / Tilt / Lift Systems and Components 340 HP/7.4L W/BORG WARNER TRANS (GM) - 7.4l MIE W/B/W GM 454 V-8 1988-1992
225-S/233 (1.32 RATIO) STERN DRIVE - 225-S 1974 4.3L EFI ALPHA/BRAVO (262 C.I.D. GEN+) - 4.3L EFI (GEN+) TBI GM 262 V-6
MERC 140 - 140 662/700 SCI - 700 SCi
ACCESSORIESOUTBOARDVOLUME I - Exhaust / Cooling Systems and Extension Kits 357 MAG BRAVO 4V/357 ALPHA 4V/383 MAG BRAVO 4V - 357 Mag Bravo 4V
525 SC - GEN VI - 525 SC - Gen VI 454 MAG BRAVO (GEN V) - 454 MAG. BRAVO (GEN. V) GM 454 V-8 1995-1996
500 CARB (502CID) 8.2L ENGINE (GEN VI) - 500 (GEN. VI)GM 502 V-8 1997-1998 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 898 1978-1982
898 (1.50 RATIO) 1228 (1.50 RATIO) 1250 (1.32 RATIO) - 898/228 1977 7.4L EFI (MIE) HURTH/BORG WARNER (GEN VI) - 7.4L TBI MIE (LH) GEN. VI GM 454 V-8 1996-1997
ACCESSORIESOUTBOARDVOLUME I - Electrical 233 ENGINE - 233 FORD 351 V-8 1975-1977
MERC 1500 - 1500 215H AND 215E STERN DRIVE - 215E 1970-1972
MERC 115 - 1150, 115 454 MAG MPI HORIZON/MIE 8.2L MPI - 454 MAG. MPI HORIZON (GEN. VI) GM 454 V-8
3.0L MPI EC - 3.0L MPI EC MERCRUISER SEC H FRESH WATER COOLING - Exhaust / Cooling Systems and Extension Kits
4.3L EFI ALPHA/BRAVO (262 CID - GEN+) - 4.3L EFI (GEN+) TBI GM 262 V-6 662 SCI - 662 SCi
200/5.0L/LX 260/5.7L 350 MAG ALPHA/BRAVO - 5.7L GM 350 V-8 1988-1995 7.4L TRANSMISSION W/HURTH (G.M.) - 7.4L MIE W/HURTH GM 454 V-8 1989-1992
5.7L/LX 350 MAG ALPHA/BRAVO - 5.7LX (4 BBL) GM 350 V-8 1996 350/6.2L BLACK SCORPION SKI (GEN+) - BLACK SCORPION MX 6.2L SKI (GEN+) V-8 2001-2002
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 470 1978-1982 ACCESSORIESOUTBOARDVOLUME I - Power Steering/Tiller Handles/ Shift Kits
888 (2 BBL)ENGINE - 888 (2 BBL.) FORD 302 V-8 1971-1977 7.4L BRAVO I, II, III, ENGINE - 7.4L BRAVO (GEN. VI) GM 454 V-8 1996-1997
420 / 425 - 420 GM 454 V-8 1987-1989 ACCESSORIESOUTBOARDVOLUME I - Fuel/Oil Tanks, Lines, Filter Kits and Corrosion
5.7 LITRE COMPETITION SKI ENGINE - 5.7L (SKI) GM 350 V-8 1985-1987 898/200/228/230/260 HP R/MR/ALPHA ONE - 260 (4 BBL.) GM 305 V-8 1982-1986
540 STROKER 4V - 540 Stroker 4V 5.7LX TBI BRAV0 350 TBI MAG ALPHA (EFI) - 5.7LX BRAVO EFI (GEN+) GM 350 V-8 1997
5.7L INBOARD ENGINE - 5.7L MIE GM 350 V-8 1997 320 HP EFI ALPHA 1/BRAVO - 320 (EFI) GM 350 V-8 1988-1989
350 MAGNUM EFI TOURNAMENT SKI - BLACK SCORPION 350 MAG SKI (GEN+) V-8 1996 MX 6.2L MPI BRAVO ENGINE - MX 6.2L MPI BRAVO
233 ENGINE - 233 MIE FORD 351 V-8 1975-1976 MERC 650E - 650 (3 CYL.)
7.4L BRAVO I, II, III, ENGINE - 454 MAG. BRAVO (GEN. V) GM 454 V-8 1996-1997 350 MAGNUM BRAVO (EFI-MP GEN+) - 350 MAG. BRAVO MPI(GEN+) GM 350 V-8 1996
350 MAGNUM TBI TOURN SKI - 350 MAG EFI SKI (GEN+) GM 350 V-8 1997 D7.3L/270 DIESEL ENGINE (STERN DRIVE/INBOARD) - 7.3L (BRAVO & MIE) DIESEL NAV 444 V-8 1994-1996
ACCESSORIES MERCRUISER VOLUME I - Power Steering/Tiller Handles/ Shift Kits 140 HORSEPOWER - 140
MARINER 70 - 70 5.0L / 5.7L STERNDRIVE - 5.7L CARB ALPHA/BRAVO
200/5.0L/LX 260/5.7L 350 MAG ALPHA/BRAVO - 260 GM 350 V-8 1987 470 ENGINE - 470 (2 BBL.) MERCURY 224 I/L4 1976-1979
MERC 140 - 1400, 140 5.7L COMPETITION SKI ENGINE (GEN +) - 5.7L COMPETITION SKI (GEN+) GM 350 V-8 1998
454/502 EFI MAG BRAVO (GEN V) - 502 EFI (GEN. V) GM 502 V-8 1993-1995 5.0L EFI ALPHA/BRAVO 5.7L EFI ALPHA/BRAVO (GEN +) ENGINE - 5.0L EFI GM 305 V-8 1998
MERC 1150E-SS - 1150 OUTBOARDS SEC B REMOTE CONTROLS - Remote Controls and Components
225-S/233 (1.32 RATIO) STERN DRIVE - 233 1975-1977 MERCURY 70 - 70 (3 CYL.)
454/502 MPI MAG BRAVO (GEN VI) - 454 MAG. MPI BRAVO (GEN VI) GM 454 V-8 100 VAZER - 100 VAZER
1500XS - 1500XS 120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 120/140 1978-1982
8.2L W/HURTH TRANSMISSION MIE ENGINE - 8.2L MIE W/HURTH GM 502 V-8 1990-1992 50/60 HP (3 CYLINDER) - 60 (3 CYL.)
600 SC BOBTAIL - 600 SC Bobtail 1998 5.7L CARB INBOARD - 5.7L CARB MIE
MERC 3.4L EFI - MERC 3.4 (EFI) 662/700 SCI - 662 SCi
7.4L MPI BRAVO L29 (GEN VI) - 7.4L BRAVO (MPI)(GEN. VI) GM 454 V-8 1998-2000 225 ENGINE - 225-S (4 BBL.)FORD 302 V-8 1973-1974
5.7L (ALPHA) (EFI-TBI)5.7L (BRAVO) (EFI-TBI) ENGINE - 5.7L BRAVO EFI (TBI) GM 350 V-8 1995 454 EFI SKI ENGINE - 454 EFI (SKI) GEN. V GM 454 V-8 1995
TR (200 RATIO) TRS (1.50 RATIO) STERN DRIVE - TR/TRS 1977-1993 MARK 50 - MARK 50, 50E
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 485 1980-1982 898/200/228/230/260 HP R/MR/ALPHA ONE - 898 (2 BBL.) GM 305 V-8 1983-1984
7.4L BRAVO - 7.4L BRAVO GM 454 V-8 1988-1991 5.7L CARB (MIE) (GEN+) - 5.7L CARB MIE
5.7L 2BBL 5.7LX 4BBL 350 MAG ALPHA/BRAVO - 5.7L (2 BBL.) GM 350 V-8 1997 7.4L/8.2L MPI (MIE) GEN VI - 7.4L MIE MPI (LH) GEN. VI GM 454 V-8 1996-1997
5.7L TOW SPORT - 5.7L CARB SKI ACCESSORIES MERCRUISER VOLUME I - Fuel/Oil Tanks, Lines, Filter Kits and Corrosion
454/502 MPI MAG BRAVO (GEN VI) - 454 MAG. BRAVO MPI (GEN VI) GM 454 V-8 1996-1997 350 MAG MPI TOURN SKI (GEN +) - 350 MAG MPI SKI (GEN+) GM 350 V-8 1998 AND UP
454 MAG MPI HORIZON/MIE 8.2L MPI - 8.2L MIE MPI (GEN. VI) GM 502 V-8 MERC 20 - 200, 20
200/5.0L/LX 260/5.7L 350 MAG ALPHA/BRAVO - 5.0LX (4 BBL.) GM 305 V-8 1988-1995 7.4 LX (EFI-MPI) BRAVO (GEN VI) - 7.4LX BRAVO (MPI)(GEN. VI) GM 454 V-8 1996-1997
5.7L (ALPHA) (EFI-TBI)5.7L (BRAVO) (EFI-TBI) ENGINE - 5.7L ALPHA EFI (TBI) GM 350 V-8 1995 888 STERN DRIVE (1.50) RATIO - 888 1971-1977
7.4L 454 MAG BRAVO GEN V - 7.4L BRAVO (GEN. V) GM 454 V-8 1992-1996 5.7L 2BBL 5.7LX 4BBL 350 MAG ALPHA/BRAVO - 350 MAG. ALPHA (4 BBL.) GM 350 V-8 1997
7.4L/8.2L MPI (MIE) GEN VI - 8.2L MIE MPI (LH) GEN. VI GM 502 V-8 1996-1997 700 SCI - 700 SCi
350 MAGNUM MPI ALPHA/BRAVO (GEN+) ENGINE - 350 MAG MPI ALPHA/BRAVO 420 / 425 - 425 (GEN. V) GM 454 V-8 1992-1993
8.2L W/HURTH INBOARD GEN V - 8.2L MIE GEN. V GM 502 V-8 1993-1996 525 HP ENGINE - 525 SC (GEN. V) GM 454 V-8 1996
60 HORSEPOWER - 60 (2 CYL.) OUTBOARDS SEC G MISCELLANEOUS PARTS MANUAL - Instruments-Gauges and Components
230 HP/5.0L 260 HP/5.7L ENGINE - 260 MIE GM 350 V-8 1987 350/6.2L MAG MPI (MIE) (GEN+) - MX 6.2L MPI MIE
5.7LX TBI BRAV0 350 TBI MAG ALPHA (EFI) - 5.7L EFI (GEN+) REPOWER PLUS GM 350 V-8 350 MAGNUM ALPHA (EFI-TBI) - 350 MAG. ALPHA EFI(GEN+) GM 350 V-8 1996
350/6.2L BLACK SCORPION SKI (GEN+) - BLACK SCORPION 350 MAG SKI (GEN+) V-8 1997-2001 454 MAG MPI HORIZON AND 8.2L MIE MPI - 454 MAG. MPI HORIZON (GEN. VI) GM 454 V-8
300 TEMPEST (MR/TR) ENGINE - 300 TEMPEST GM 350 V-8 1985-1986 3.4 LITRE - 300 (3.4 LITRE)
R/MR ALPHA ONE STERNDRIVE - R/MR/ALPHA ONE (Transom Assembly) 1983-1990 SCORPION 377 - Scorpion 377
MERC 80 - 800 (4 CYL. ), 80 (4 CYL.) 350 MAGNUM BRAVO (EFI/MP) - 350 MAG. BRAVO MPI GM 350 V-8 1995
357 MAG BRAVO 4V/357 ALPHA 4V/383 MAG BRAVO 4V - 383 Mag Bravo 4V 262 MAGNUM (EFI - TBI) - 262 MAG (TBI)(GEN+)
200/5.0L/LX 260/5.7L 350 MAG ALPHA/BRAVO - 200 (2 BBL.) GM 305 V-8 1987 330 HP ENGINE W/BORG WARNER - 330 GM 454 V-8 1982-1987
7.4 LX (EFI-TBI) BRAVO (GEN VI) - 7.4LX BRAVO (TBI)(GEN. VI) GM 454 V-8 1996-1997 5.7L/LX TBI ALPHA & BRAVO(2BBL/4BBL) - 5.7LX EFI (4 BBL.-TBI) GM 350 V-8 1996
350/6.2L MAG MPI (MIE) (GEN+) - 350 MAG MPI HORIZON MIE 200/5.0L/LX 260/5.7L 350 MAG ALPHA/BRAVO - 350 MAG. ALPHA GM 350 V-8 1987-1995
EXHAUST/COOLING SYSTEMS AND EXTENSION KITS - Exhaust / Cooling Systems and Extension Kits HP 500 (502 CID) - 500 (GEN. V) GM 502 V-8 1996
454/502 MPI MAG BRAVO (GEN VI) - 502 MAG. MPI (GEN VI) GM 502 V-8 1996 5.7L COMPETITION SKI ENGINE - 5.7L COMPETITION SKI GM 350 V-8 1987-1995
230 HP/5.0L 260 HP/5.7L ENGINE - 5.7L MIE GM 350 V-8 1988-1993 215 ENGINE - 215 MIE FORD 302 V-8 1970-1972
5.7L/LX 350 MAG ALPHA/BRAVO - 350 MAG. ALPHA (4 BBL.) GM 350 V-8 1996 MERCRUISER SEC F POWER TRIM AND TILT - Trim / Tilt / Lift Systems and Components
454 MAG MPI HORIZON AND 8.2L MIE MPI - 8.2L MIE MPI (GEN. VI) GM 502 V-8 525 HP ENGINE - 525 SC (GEN. V) GM 454 V-8 1992-1995
350 MAG MPI BRAVO - 350 MAG. BRAVO MPI(GEN+) GM 350 V-8 1997 VAZER 100 EC - 100 VAZER EC
ACCESSORIESOUTBOARDVOLUME I - Trim / Tilt / Lift Systems and Components 90 HORSEPOWER - 90 (6 CYL.)
255/280 TRS - 255-TRS 1973-1974 MARINER 60 - 60 (2 CYL.)
5.7L/LX 2BBL AND 4BBL TBI ALPHA/BRAVO - 5.7LX EFI (4 BBL.-TBI) GM 350 V-8 1997 357 MAG BRAVO 4V/357 ALPHA 4V/383 MAG BRAVO 4V - 357 Alpha 4V
120/140 (1.98 RATIO) 165 (1.65 RATIO) 470/485 (1.84 RATIO) 260/898/228 (1.50 RATIO) - 228 1978-1982 255/280 TRS - 280-TRS 1975-1976
4.3L ALPHA/BRAVO (262 CID - GEN +) - 4.3LH (GEN +) (4 BBL.) GM 262 V-6 1998 502 MAGNUM BRAVO ENGINE - 502 MAG. BRAVO GM 502 V-8 1990-1992
ACCESSORIES REMOTE CONTROLS VOL.1 - Remote Controls and Components 5.7L 2BBL COMP SKI ENGINE - 5.7L COMPETITION SKI GM 350 V-8 1996
350 MAGNUM ALPHA (EFI-TBI) - 5.7LX BRAVO EFI (GEN+) GM 350 V-8 1996 350 MAGNUM ALPHA (EFI-TBI) - 5.7LX BRAVO EFI (GEN+) GM 350 V-8 1996