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Freeman Compression seal gasket Model 30 (30" / 762 mm)
€133.30
Freeman Low-friction nylon washer for hatch mechanism
€4.20
Freeman Dog arm cam button (friction slide button)
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Freeman Bushing assembly with stainless steel sleeve (pre-2011)
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Deck hatches & spare partsSpare Parts & MaintenanceSpare Parts – Round HatchesModel 20 (20" round)

Spare Parts for Freeman Marine Model 20 Round Deck Hatches (20" / 508 mm)

Welcome to Bövik Marin AB – authorized European supplier of genuine factory replacement parts for Freeman Marine Model 20 round cast deck hatches. Offering a 20-inch (508 mm) clear opening, Model 20 is widely specified as a primary personnel access hatch and certified emergency escape hatch across patrol craft, Coast Guard cutters, tugs, workboats, and high-speed passenger ferries.

Model 20 is engineered in both compression and knife-edge sealing formats (Models 20, 20-H, 20K, and 20-HK). Mechanically, Model 20 transitions to Freeman's classic 4-arm dogging architecture: a central 4-hole cam hub synchronizes four 9.50-inch aluminum dog arms to deliver balanced, heavy-duty clamping force around the entire 508 mm clear opening in less than a quarter-turn. Below you will find all genuine mechanical components and gaskets required for routine maintenance and class survey overhauls.

Model 20 Component Directory (Featured Items Below):

1. Sealing System & Gaskets • Compression Gasket (Part no. 9801-2007)
• Knife-Edge Gaskets (hollow profile for aluminum & steel coamings, Part no. 9812-2005)
2. Dogging Mechanism & Arms • Aluminum Dog Arm 9.50" (Part no. 0211-2004)
• 4-Hole Cam Hub (Part no. 0011-2002)
• Optional: 316 S/S stainless dog arms
3. Actuation & Drive Shaft • Flush Deck Handle 316 S/S
• Handle Spindle & Roll Pins (15"+ standard)
• Inside Escape Handle Assemblies
4. Center Bushing & Hardware • Universal Bushing Overhaul Kit (Part no. 0031-2204)
• Cam Buttons / Wear Pads (Part no. 0621-2004)
• Nylon Thrust Washers (Part no. 0413-2005)

Technical Guide: Service and Gasket Specification for Freeman Model 20 Round Hatches

Because Model 20 (Series 2406 & 2407) is widely deployed as a vital machinery space access or emergency escape hatch, maintaining mechanical and sealing components to factory tolerances is essential. Model 20 is designed for rapid egress from below using an inside escape handle as well as topside actuation via the flush T-handle.

1. Gasket Guide for Model 20 – Compression vs. Knife-Edge

  • Compression Hatches (Models 20 & 20-H): Utilize Freeman's solid continuous molded Compression Gasket (Part no. 9801-2007). The coaming features a smooth raised seating spigot without an outer collection trough, making decks effortless to wash down. The same continuous ring fits both lift-out covers and hinged (-H) variants across aluminum and steel deck rings.
  • Knife-Edge Hatches (Models 20K & 20-HK): The coaming features a machined knife-edge rim flanked by a deep perimeter drainage gutter. The gasket is a hollow D-profile marine neoprene elastomer (Part no. 9812-2005 for aluminum and steel coamings). The hollow profile delivers massive concentrated sealing pressure, standing up to severe green-water wash on exposed weather decks.

2. Mechanical Geometry: 4-Arm Kinematics with 9.50" Dog Arms

Model 20 operates via Freeman's 4-hole marine aluminum cam hub (Part no. 0011-2002) and four 9.50-inch aluminum dog arms (241 mm, Part no. 0211-2004). This identical arm length is also utilized in Freeman's commercial bestseller Model 1524 oval. During scheduled maintenance, inspect dog arms for straightness and renew nylon cam buttons (Part no. 0621-2004) to ensure smooth travel across the hub tracks.

3. Center Bushing & Spindle Sealing

Moisture weeping beneath the flush deck handle indicates worn spindle O-rings. Model 20 utilizes Freeman's heavy-duty Universal Center Bushing Overhaul Kit (Part no. 0031-2204), containing a marine-grade sleeve bushing, dual O-rings, and stainless roll pin. Always coat O-rings with waterproof marine grease during reassembly.

Need a Complete New Hatch Assembly or Replacement Deck Coaming?

If your coaming has suffered structural damage or you are engineering a new deck opening, explore complete hatch assemblies and genuine factory coamings:

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