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    • Underwater Hardware

    Wanting to upgrade your system's propellers? On the hunt for marine underwater connectors and cables? No matter what you're looking for, Discount Inboard Marine is sure to have the best prices on underwater hardware and accessories from the top manufacturers in the industry. From marine underwater mechanical cables to drive shaft seals, you'll find a vast selection of products perfect for any repair, replacement or overhaul. Discover why experienced boaters trust Discount Inboard Marine as their go-to inboard engine parts supplier. 

    • DRIVE SHAFT COUPLING BOLT SET
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      DRIVE SHAFT COUPLING BOLT SET

      3/8-16 x 1-1/4" (Nylock nuts) S30400 stainless, Velvet Drive coupler and PCM 40 series. Not lomg enough for 2013 and newer PCM 80 series transmissions with 1/2" thick flanges.     Bin Number (ISBN): 2232
      $14.00
      Add to Cart
    • KEY STRAIGHT BRASS
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      KEY STRAIGHT BRASS

      1/4" SQ x 2" L Prop Key, may have to cut length to fit some newer boats. The chamfered or radius side goes towards the shaft and the straight edged side fits into prop.   Brass Key. D.I.M. has a large selection of nuts, keys, and cotter pins...
      $9.00
      Add to Cart
    • NYLOCK PROP NUT 1-1/4" SHAFT NUTNYBR789
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      NYLOCK PROP NUT 1-1/4" SHAFT NUTNYBR789

      Fits boats with 1-1/4" shaft (Not for 1" or 1-1/8" shaft). Nautique G-boats, some Malibu/Axis. Brass nut with nylon insert 7/8-9.   Nylock Prop Nut 1-1/4" Shaft | NUTNYBR789 | Discount Inboard Marine   Bin Number...
      $20.99
      Add to Cart
    • PROP NUT, CC
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      PROP NUT, CC

      Fits 1" or 1-1/8" shafts, the castle nut can be replaced with Nylock nut but will cover up the cotter pin hole (no longer need cotter), 3/4-10 thread.   OLD part # NUTSLBR3410   Bin Number (ISBN): 2004210
      $30.00
      Add to Cart
    • PROP NUT, NYLOCK, 3/4X10
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      PROP NUT, NYLOCK, 3/4X10

      Brass Nylock Nutn Fits 1" or 1-1/8" shafts, 3/4-10 thread.   D.I.M. has a large selection of nuts, keys, and cotter pins in both brass and stainless steel. We recommend the nylock nut over the castle nut. If you have a Nautique with the castle...
      $16.00
      Add to Cart
    • PROP LOCK PROP LOCK
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      PROP LOCK

      "The Defender" is a great theft deterant for boats in public storage. Fit's 1" or 1-1/8" shafts that have the standard 3/4 -10 thread.     Protect your propeller and deter thieves with the Defender anti-theft inboard prop nut from A.R.E. The...
      $66.75
      Add to Cart
    • Wooden Shift Knob Wooden Shift Knob
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      Wooden Shift Knob

      Original OEM Spec Replacement- These are made in the USA from first quality walnut and have been hand finished in a quality polyurethane. Shift Knob, Wood, fits most Inboards 70's and up (Mahogany look).
      $27.00
      Add to Cart
    • 13 X 12.5 (.105C) RH 4 BLD 1
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      13 X 12.5 (.105C) RH 4 BLD 1

      Diameter: 13.00"Pitch: 12.50"Cup: .105"Hub Length: 02.750"Bore: 1.00"Blades: 4Rotation: Right   ACME 480 13.00" x 12.50" Right Hand Propeller 4-Blade   Bin Number (ISBN): 2004154
      $520.00
      Add to Cart
    • XMP 13 X 12 3 BLD KEY 1
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      XMP 13 X 12 3 BLD KEY 1

      The SkiPro propellers boast an enhanced pitch distribution along with a new blade shape that produces better top-end and low-end power.  Providing the best of speed and pulling power, the SkiPro prop outruns and overpowers the competition...
      $520.00
      Add to Cart
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