Seasure Onboard Chandlery

Our Onboard Chandlery section include essential marine equipment that your boat can’t go without, including boat seats, fender and buoys, search lights, boat trailers and traditional Nauticalia pieces that will make your boat feel and look more homely. Browse through our huge selection and we’ll impress you with our unbeatable prices. Why not have a look at our great section on galley and heads.


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  1. SeaSure Holding Tank Vent Filter, Onboard Chandlery

    SeaSure Holding Tank Vent Filter

    The Microvent Holding Tank Vent Filter prevents unwanted odours. It's easy to install and change when needed, although the charcoal filter will last a long time
    £78.99
    RRP: £104.99
    Saving: £26.00

  2. SeaSure Double Swivel Hook Block , Onboard Chandlery

    SeaSure Double Swivel Hook Block

    Double Swivel Hook Block (00.22) 25mm Double Swivel Hook Block The high strength to weight ratio and simple construction of the "00" range of blocks gives years of trouble free service. Electro- polished 316 stainless steel construction, hollow rivets for lightness, tough plastic sheaves.
    £20.99
    RRP: £23.99
    Saving: £3.00

  3. SeaSure Bolt Down Block, Onboard Chandlery

    SeaSure Bolt Down Block

    Bolt Down Block (01.18) Bolt Down Block (Metal Sheave) Brass sheave blocks For use in high load applications such as those imposed by wire and Dyneema halyards. The stainless steel side plates prevent highly abrasive ropes from cutting in
    £11.99

  4. SeaSure Stainless Steel 25mm Blocks - Single Block With Becket, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Single Block With Becket

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited nylon, polyester and polupropylene ropes.
    £10.99

  5. SeaSure Stainless Steel 25mm Blocks - Treble block with becket, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Treble block with becket

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £18.99
    RRP: £21.99
    Saving: £3.00

  6. SeaSure Brass Sheave 25mm Blocks - In line fixing mast sheave (small side plates), Onboard Chandlery

    SeaSure Brass Sheave 25mm Blocks - In line fixing mast sheave (small side plates)

    These Brass sheave blocks are ideal for high load applications particularly with wire or dyneema. Suitable for up to 4mm wire, dyneema, spectra or Kevlar.
    £11.99

  7. SeaSure 25mm Base Mounted Swivel Block (00.19), Onboard Chandlery

    SeaSure 25mm Base Mounted Swivel Block (00.19)

    25mm Base Mounted Swivel Block The high strength to weight ratio and simple construction of the "00" range of blocks gives years of trouble free service.
    £15.99
    RRP: £16.99
    Saving: £1.00

  8. SeaSure Inline Mast Block, Onboard Chandlery

    SeaSure Inline Mast Block

    For use in high load applications such as those imposed by wire and Dyneema halyards. The stainless steel side plates prevent highly abrasive ropes from cutting in.
    £13.99

  9. SeaSure Stainless Steel 25mm Blocks - Single block with clevis pin, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Single block with clevis pin

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £8.99

  10. SeaSure Heavy duty mast block, Onboard Chandlery

    SeaSure Heavy duty mast block

    Heavy duty mast block (03.55) Heavy duty mast block with removable plastic sheave - 38mm diameter sheave Deck, mast and stanchion blocks These are 316 stainless steel bodied turning blocks offer a range of stanchion mounting configurations. They are particularly useful for running furling handsail lines back to the cockpit. They are low maintenance and will continue to look good for years to come.
    £42.99
    RRP: £46.99
    Saving: £4.00

  11. SeaSure Stainless Steel 25mm Blocks - Double block with becket, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Double block with becket

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £16.99
    RRP: £17.99
    Saving: £1.00

  12. SeaSure Brass Sheave 25mm Blocks - Single block with hollow rivet, Onboard Chandlery

    SeaSure Brass Sheave 25mm Blocks - Single block with hollow rivet

    These Brass sheave blocks are ideal for high load applications particularly with wire or dyneema. Suitable for up to 4mm wire, dyneema, spectra or Kevlar.
    £12.99

  13. SeaSure Swivel Lead Block, Onboard Chandlery

    SeaSure Swivel Lead Block

    Swivel Lead Block (00.29) 25mm Swivel Lead Block The high strength to weight ratio and simple construction of the "00" range of blocks gives years of trouble free service. Electro- polished 316 stainless steel construction, hollow rivets for lightness, tough plastic sheaves.
    £18.99
    RRP: £20.99
    Saving: £2.00

  14. SeaSure Stainless Steel 25mm Blocks - Bolt down block, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Bolt down block

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited nylon, polyester and polupropylene ropes.
    £6.99

  15. SeaSure Single Ball-Race Block, Onboard Chandlery

    SeaSure Single Ball-Race Block

    Single Ball-Race Block with Hollow Rivet (01.36) 25mm stainless sheave blocks - Ball race These ball race blocks are designed to take high loads and be very light. They have a double row of captive stainless steel balls running within a stainless steel sheave. This ensures minimal deflection of both ball and housing helping prevent "dig in" under high loads
    £17.99
    RRP: £18.99
    Saving: £1.00

  16. SeaSure Stainless Steel 25mm Blocks - Single block with V Jammer, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Single block with V Jammer

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £13.99

  17. SeaSure Brass Sheave 25mm Blocks - Single block with clevis pin, Onboard Chandlery

    SeaSure Brass Sheave 25mm Blocks - Single block with clevis pin

    These Brass sheave blocks are ideal for high load applications particularly with wire or dyneema. Suitable for up to 4mm wire, dyneema, spectra or Kevlar.
    £13.99

  18. SeaSure Inside Boom Single Line Reefing Block , Onboard Chandlery

    SeaSure Inside Boom Single Line Reefing Block

    Carbon fibre roller race blocks These simple yet strong blocks are low weight and operate well under a wide range of load conditions.
    £24.99
    RRP: £26.99
    Saving: £2.00

  19. SeaSure Stainless Steel 25mm Blocks - Double block with V Jammer, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Double block with V Jammer

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £19.99
    RRP: £20.99
    Saving: £1.00

  20. SeaSure Double Block with Clevis Pin, Onboard Chandlery

    SeaSure Double Block with Clevis Pin

    Double Block with Clevis Pin (00.20) 25mm Double Block with Clevis Pin The high strength to weight ratio and simple construction of the "00" range of blocks gives years of trouble free service. Electro- polished 316 stainless steel construction, hollow rivets for lightness, tough plastic sheaves.
    £11.99

  21. SeaSure Deck Lead Block, Onboard Chandlery

    SeaSure Deck Lead Block

    For use in high load applications such as those imposed by wire and Dyneema halyards. The stainless steel side plates prevent highly abrasive ropes from cutting in.
    £11.99

  22. SeaSure Stainless Steel 25mm Blocks - Single Block With Shackle, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Single Block With Shackle

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited nylon, polyester and polupropylene ropes
    £9.99

  23. SeaSure Snap Together Block, Onboard Chandlery

    SeaSure Snap Together Block

    Snap Together Block (04.59BLOCK) 8mm Snap Together Block Small
    £0.99

  24. SeaSure Stainless Steel 25mm Blocks - Treble block with shackle, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Treble block with shackle

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £19.99
    RRP: £20.99
    Saving: £1.00

  25. SeaSure Brass Sheave 25mm Blocks - Spar mounted block (flat lugs), Onboard Chandlery

    SeaSure Brass Sheave 25mm Blocks - Spar mounted block (flat lugs)

    These Brass sheave blocks are ideal for high load applications particularly with wire or dyneema. Suitable for up to 4mm wire, dyneema, spectra or Kevlar.
    £11.99

  26. SeaSure Treble Block with Becket (00.33) 25mm Treble Block with Becket, Onboard Chandlery

    SeaSure Treble Block with Becket (00.33) 25mm Treble Block with Becket

    Treble Block with Becket (00.33) 25mm Treble Block with Becket The high strength to weight ratio and simple construction of the "00" range of blocks gives years of trouble free service. Electro- polished 316 stainless steel construction, hollow rivets for lightness, tough plastic sheaves.
    £18.99
    RRP: £21.99
    Saving: £3.00

  27. SeaSure Stainless Steel 25mm Blocks - General purpose block, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - General purpose block

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited nylon, polyester and polupropylene ropes.
    £6.99

  28. SeaSure General Purpose Ball-Race Block, Onboard Chandlery

    SeaSure General Purpose Ball-Race Block

    These ball race blocks are designed to take high loads and be very light. They have a double row of captive stainless steel balls running within a stainless steel sheave. This ensures minimal deflection of both ball and housing helping prevent "dig in" under high loads.
    £16.99
    RRP: £17.99
    Saving: £1.00

  29. SeaSure Stainless Steel 25mm Blocks - Deck lead block, Onboard Chandlery

    SeaSure Stainless Steel 25mm Blocks - Deck lead block

    This neat range of 25mm Stainless steel blocks offer a complete solution for control lines, halyards, outhauls, kicking starps, furling lines etc which all use up to 8mm standard 3 strand or plaited n
    £7.99

  30. SeaSure Brass Sheave 25mm Blocks - Single block with becket, Onboard Chandlery

    SeaSure Brass Sheave 25mm Blocks - Single block with becket

    These Brass sheave blocks are ideal for high load applications particularly with wire or dyneema. Suitable for up to 4mm wire, dyneema, spectra or Kevlar.
    £13.99

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