Schaefer - Double Block/ Universal Head
#504-25 Double Aluminum Block with high strength head.
- High-strength head retains three-way locking feature.
- Use with #747-08 DuraRatchet for complete Mainsheet or Vang control.
- Use with 5 series Adapters for custom applications.
Schaefer
Categories
- 100 mm Blocks
- 125 & 150 mm Blocks
- 57 mm Blocks
- 75 mm Blocks
- Air runner Blocks
- Crossover Blocks
- ESP Blocks
- Footblocks
- Harken Big Boat Flip-Flop Blocks
- Mastbase Halyard Leads
- Stainless Steel Blocks
- Stainless Steel ESP Blocks
- Stainless Steel Runner Blocks
- Teardrop Blocks
- 32mm Aluminum T-tracks
- Stainless Steel T-Tracks
- Big Boat CB Track Accessories
- Big Boat CB Track Retrofit 4 in. Hole Spacing
- Big Boat CB Track Variable Hole Spacing
- T-track Accessories
- Genoa Leads Cars
- Battcars - System A CB
- Battcars - System AA CB
- Battcars - System B CB
- Furling Mainsail Outhaul Blocks
- Big Boat CB Traveler Cars
- Big Boat CB Traveler Tracks
- Big Boat Traveler Car Controls
- Big Boat Traveler Car Couplers
- Big Boat Traveler End Controls
- Harken Mini-Maxi Cars & Controls
- Harken Mini-Maxi CRX Roller Travelers
- Harken Mini-Maxi Tracks
- Track Bending Service
- Traveler - Dodger Track Riser Kit
- Windward Sheeting CB Traveler Cars
- Deck Organizers
- Complementary Hardware
- Spinnaker Pole Cars & End Fitting
- Harken 2.25" Blocks
- Midrange Hexaratchets Blocks
- Harken 2.25" & 3.00"Hexa-Cat Bases Blocks
- Harken 3.00" Blocks
- Harken Hexaratchets Blocks
- Harken Little Hexaratchet Blocks
- Harken Fiddle Blocks
- Thru Deck Blocks
- Harken Bullet Blocks
- Harken Big Bullet Blocks
- Harken Micro Blocks
- 29 mm Carbo Blocks
- 57 mm Carbo Blocks
- Carbo Ratchets Triples
- 40 mm Carbo Ratchets
- Carbo Fiddle Blocks
- 57 mm Carbo Ratchets
- Carbo Ratchamatic
- 40 mm Carbo Blocks
- 75 mm Carbo Blocks
- 75 mm Carbo Ratchets
- Harken Line / Wire High Strength Blocks
- Harken 16 mm Blocks
- Harken Dinghy Vang System
- Snatch Blocks
- Harken Stand-Up Bases
- Harken Cam Cleats Bases
- Harken Cam Cleats Accessories
- Harken Cam Cleats
- Micro Cam Kits
- Standard Cam Kits
- Harken Trigger Cleats and Bases
- Harken Complementary Hardware
- Small Boat CB Track Accessories
- Midrange CB Track Accessories
- Harken Small Boat CB Track Accessories
- Small Boat CB Retrofit 4" Hole Spacing
- Midrange CB Retrofit 4" Hole Spacing Tracks
- Midrange CB Track Variable Hole Spacing
- Small Boat CB Track Variable Hole Spacing
- Lazy Jacks & Reefing Systems
- Battcars - System B CB
- Furling Mainsail Outhaul
- Harken Two Speed Mainsheet Systems
- Harken Deck Organizers
- Track Bending Service
- Small Boat Traveler Controls & Accessories
- Small Boat CB Traveler Tracks
- Midrange Car Control
- Midrange Stand-Up Toggles
- Midrange CB Traveler Tracks
- Midrange CB Traveler Cars
- Midrange Traveler End Controls
- Windward Sheeting CB Traveler Cars
- Micro CB Cars
- Micro CB Traveler Tracks
- Small Boat CB Cars
- Harken Genoa Cars
- Harken Spinnaker Pole Cars & End Fitting
- Hoister Systems
- All Purpose Blocks
- Ball Bearing Blocks
- Foot Blocks
- High Load Blocks
- Lead Blocks
- Orbit Blocks
- Ratchet Blocks
- Snatch Blocks
- Utility Blocks
- Wire Blocks
- Block Accessories
- Ball Bearing & Slide Rod Traveller Systems
- Ball Bearing Traveller System
- C-Track Traveller System
- Series 19mm, Cars
- Series 19mm, Control Ends
- Series 19mm, Track
- Series 32mm, Cars
- Series 32mm, Control Ends
- Series 32mm, Track
- Traveller System Accessories
- T-Track Traveller System
- Deck Hardware
- Mainsheet Systems
- Ball Bearing Batten Car System
- Ballslide Trackless Batten Car System
- Batten Pocket Protectors
- Batten Receptacle Links
- Batten Receptacles
- Captive Ball Batten Car System
- Barrel Swivels
- Bow Shackles
- Forged Bronze Snap Shackles
- Halyard Shackles
- Lighweight Clevis Pin Dee Shackles
- Long Dee Shackles
- Miscellaneous Shackles
- Quick Links
- Shackle Keys
- Hooks
- Sister Clips
- Standard Snap Shackles
- Swivel Shackles
- Trunnion Snap Shackles
- Twisted Shackles
- Wide Dee Shackles
- Cam Cleat
- Carbine Hooks
- Chain Plates
- Deck Eyes
- Eye & Eye
- Eye & Fork
- Fork & Fork
- Toggle & Eye
- Toggle & Swage, Imperial Wire
- Toggle & Swage, Metric Wire
- Toggle & Toggle
- Turnbuckle Accessories
- Fittings
- Sail Hardware
- Imperial Wire
- Spare Parts
- Retaining Clips & Spings
- Stay Adjusters
- Turnbusckles
- Hooks
- Spar hardware
- Sail Hardware
- Drain Plugs
- Inspection Hatches
- Miscellaneous Plastic Hardware
- Through Bushings
- Tie Balls
- Welded Rings
- Miscellaneous Plastic Hardware
- Rudder & Steering
- Fittings
- Furling
- Spinnaker Hardware
- Tiller Extensions
- Trapeze Hardware
- Tools
- Series 1
- Series 2
- Series 3
- Series 5
- Series 5AD
- Series 7
- Series 7FB
- Series 7 Accessories
- Series 8 & 9
- Series 10 & 11
- Series 12 & 120
- Flat Base Cheek Block
- Curved Base Cheek Block
- Fixed Fairlead Blocks
- Footblocks
- Flat Base Cheek Block Pads
- Stand-up Swivel Blocks
- Halyard Turning Blocks
- M Series Blocks
- Over the Top Blocks
- Snatch Blocks
- Utility Blocks
- Wire Blocks
- Boom Vangs
- Lazy Jacks
- Deck Organizers
- Fairleads
- Cam Cleats & Bases
- Exit Boxes
- Shackles
- Backing Plates
- Bullseye
- Eye Straps
- Padeyes
- Bow Eye / Lifting Ring
- Removable Eye Deck Plates
- Aluminum Sheaves
- Black Delrin Sheaves
- Stainless Steel Cleats
- Thru Deck Leads
- T Track
- Jiffy Reef Slides / Blocks
- Spinnaker Pole Sliders
- Stanchions & Bases
- Halyards Restrainers
- Genoa Prefeeders
- Mainsail Prefeeder
- 750 Furling System
- 1100 Jib Furling System
- 2100 Jib Furling System
- 3100 Jib Furling System
- 4100 Jib Furling System
- Jib Furling System
- Rigid System
- Snapfurl System Accesories
- Snapfurl Miscellaneous
- Snapfurl
- Travelers and Accessories
- Schaefer Miscellaneous Hardware
- Anchoring
- LOW PROFILE
- Trim Roller Screen Kits
- MEDIUM PROFILE
- OCEAN
- FLUSH HATCH
- PILOT HATCH
- Trim Kits
- Spare Hatch Screens
- Portlights
- WHEELS
- INSTRUMENT PODS
- ACCESSORIES
- Plain Roller Upper Deck Cover/Thrust Race
- Upper self aligning roller bearing / thrust race
- Lower self Aligning GRP tube bearings
- Locking Rings
- Lower Self Aligning Alu Roller Bearings
- Lower Aluminium Roller Bearing
- Upper self aligning roller Bearings
- Tiller Heads
- Plain Roller Upper Bearing
- Lip Seals
- Synchro Blocks
- Control Blocks
- Racing blocks
- Footblocks
- Runner Blocks
- Snatch Blocks
- Halyard Blocks
- Stainless / Custom Blocks
- ACCESSORIES
- GENOA CARS
- TRAVELERS
- TRACK
- ROPE CLUTCHES
- ORGANISERS
- Windlasses V700 Series
- Windlasses C Series Capstan
- Windlasses Horizontal Series - H3
- Windlasses Horizon Series - H2
- Windlasses Dual Direction Control Box
- Windlass Miscellaneous Accessories
- Windlasses Circuit Breaker
- Manual Recovery System for H2 & H3
- Chain Stoppers
- Windlass Contactor
- Windlass Switches
- Winch Handles
- Rope Clutches
- Shackles
- Travelers & T-Track
- Deck Organizers
- Dinghy Davits
- Genoa Car Systems
- Foot Blocks
- Halyard Lift Blocks
- Mast Collar Blocks
- Mast Exit Blocks
- Snatch Blocks
- Stanchion Blocks
- Track Car Single Blocks
- Triple Blocks
- Triple Blocks with Becket
- Unibody Double Blocks
- Unibody Double Blocks with Becket
- Unibody Single Blocks
- Unibody Single Blocks with Becket
- Unibody Triple Blocks
- Unibody Triple Blocks with Becket
- Backstay Blocks
- Cheek Blocks
- Fiddle Blocks with Adjustable Shackle
- Fiddle Blocks with Becket and Adjustable Shackle
- Fiddle Blocks with Becket and Snap Shackle
- Fiddle Blocks with Becket, Cam Cleat and Adjustable Shackle
- Fiddle Blocks with Becket, Cam Cleat and Snap Shackle
- Fiddle Blocks with Cam Cleat and Adjustable Shackle
- Fiddle Blocks with Cam Cleat and Snap Shackle
- Fiddle Blocks with Snap Shackle
- Single Blocks with Adjustable Shackle
- Single Blocks with Becket and Adjustable Shackle
- Single Blocks with Becket and Snap Shackle
- Single Blocks with Becket and Swivel Stand-up Deck Plate
- Single Blocks with Snap Shackle
- Single Blocks with Swivel Stand-up Deck Plate
- Double Blocks
- Double Blocks with Becket
- Flagpole Staff
- Hinges
- Kayak Racks
- Mast Plates
- Masthead Sheaves
- Midship Cleats
- Radar Towers
- Stay Adjusters
- Stay Anchor
- Stem Fittings
- Swivel Jam with Deck Mount
- Table Mounts
- Turnbuckles
- Boom Bails
- Boom Tangs
- Bow Rollers
- Eye Strap
- Adjustable Shackle
- Stanchion Hardware & Accessories
- Boom Vangs
- Watches
- Harken Sailing Shoes
- Harken Sailing Gloves
- Sunglasses
- Harken Hats
- Harken Shorts & Pants
- Sailing Shirts
- Harken Jackets
- Sailing Accessories
- Sailing Bags
- Coolers
- Sailing Racing Videos
- Ronstan Sailing Boots
- Ronstan Sailing Gloves
- Asymmetric Spinnaker Furler
- Facnor Code 0 Furler
- LS Series Jib Furlers
- LX Series Jib Furlers
- RC Racing Furlers
- RX Racing /Cruising Furlers
- Standard Gennaker Furler
- Facnor Wire Furler
- Facnor Blocks
- Facnor Thimbles
- Facnor Luff Rope
- Facnor Furling Line Loops
- Facnor Foils
- Facnor Link Plates
- Harken Furling Units
- Furling Units Accessories
- Harken Code Zero Furlers
- Code Zero Accessories
- Harken Stay Sails & Gennakers
- Hydraulic, Carbon and Large Furling
- Harken Small Boat Furling
- 750 Furling System
- 1100 Jib Furling System
- 2100 Jib Furling System
- 3100 Jib Furling System
- 4100 Jib Furling System
- Free Furling System
- Rigid System
- Snapfurl
- 350 Free Furling
- Classic Series
- Racing Series
- Coastal Series
- Flying Sail Furlers
- Electric Furlers
- Profurl Accessories
- NEX Series
- In-Boom Furling Systems
- RADIAL WINCHES
- One-, Two-, Three-Speed"
- One, Two Speed Self-Tailing"
- Single Speed
- Three-Speed Self-Tailing
- Two Speed
- Quattro
- Control Boxes, Circuit Breakers, Switches & Disconnect Rods"
- ELECTRIC WINCHES AND KITS
- WINCH ACCESSORIES
- RACING WINCHES
- Standard Winches
- Winch Spare Parts
- Self Tailing Winches
- Racing Winches
- Self Tailing Winches - 50 to 68
- Electric Winches
- Foredeck
- SafetyEquipment
- Canvas
- Solar & Wind Power
- NEW Items
News
- 05/30/2011
- Leukemia Cup Regatta comes to the Hudson
- 05/30/2011
- Beer Can Racing on Hudson River
- 02/06/2011
- Harken Radial Winches
- 09/11/2010
- 2010 Larchmont NOOD YouTube
 Sign up for Sailboat hardware and Gear Promotions
Click here! |