SeaSure Blocks offers a versatile range of marine-grade blocks designed for various applications, including high-load uses such as lifting systems and garage door mechanisms.
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1-2 weeks delivery time SeaSure 00.31 is a 25 mm treble Mini block from SeaSure’s plain bearing range, manufactured with marine-grade stainless steel side plates and rivets and hard-wearing Arnite plastic sheaves. It accepts ropes up to 8 mm and has a breaking load of 1250 kg. The three-sheave configuration can be used to create a 6:1 purchase system, helping reduce rope load when lifting heavier objects.
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$ 66.96
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1-2 weeks delivery time SeaSure 00.32 is a 25 mm treble Mini block with becket from SeaSure’s plain bearing range, manufactured with marine-grade stainless steel side plates and rivets and hard-wearing Arnite plastic sheaves. It accepts ropes up to 8 mm and has a breaking load of 1250 kg. The three-sheave configuration with becket can be used to create a 6:1 purchase system, helping reduce rope load when lifting heavier objects.
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$ 71.88
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1-2 weeks delivery time SeaSure 00.33 is a 25 mm treble Mini block with becket, manufactured with highly polished marine-grade stainless steel side plates and rivets and hard-wearing black plastic sheaves. It uses a simple plain bearing, accepts ropes up to 8 mm and has an MBS / breaking load of 1250 kg with an SWL of 625 kg. The three-sheave configuration can be used to create a 6:1 purchase system, while the integrated becket provides an additional rope attachment point.
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$ 56.90
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1-2 weeks delivery time SeaSure 00.35 is a 25 mm treble Mini block with integrated V-jammer and becket, manufactured with marine-grade stainless steel side plates and rivets and hard-wearing Arnite plastic sheaves. It accepts ropes up to 8 mm and has an MBS / breaking load of 1250 kg with an SWL of 625 kg. The three-sheave configuration can be used to create a 6:1 purchase system, while the V-jammer allows the rope to be cleated directly at the block for lifting or tensioning applications.
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$ 63.64
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1-2 weeks delivery time SeaSure 00.39 is a 25 mm plain bearing general purpose block designed for ropes up to 8 mm. It is intended for applications such as lazy jacks and take-up systems and combines lightweight stainless steel construction with hollow rivets and a tough plastic sheave. The design provides simple, reliable rope guidance for general marine control-line configurations.
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$ 20
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1-2 weeks delivery time SeaSure 25 mm Multi-Part Holder Sets combine highly polished stainless steel blocks with 25 mm black plastic sheaves in 2-part, 3-part, 4-part and 5-part configurations. All variants use simple plain bearings, are suitable for ropes up to 8 mm and belong to the fixed Mini OBS series.
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$ 123.32
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1-2 weeks delivery time SeaSure 01.01 is a 25 mm single block with shackle, designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates, while the shackle provides a simple removable attachment to an anchor point. The block has an MBS / breaking load of 950 kg and an SWL of 475 kg. SeaSure specifies a maximum rope diameter of 4 mm.
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$ 192.75
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1-2 weeks delivery time SeaSure 01.02 is a 25 mm single high-load block designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates, a simple plain bearing and a pin-style attachment. The block has an MBS / breaking load of 950 kg and an SWL of 475 kg. SeaSure specifies a maximum rope diameter of 4 mm. The range is commonly used with Dyneema, Spectra and Kevlar lines.
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$ 172.81
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1-2 weeks delivery time SeaSure 01.03 is a 25 mm single high-load block with becket, designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The becket provides an attachment point for the rope and allows the block to form part of a 2:1 purchase system. SeaSure specifies a maximum rope diameter of 4 mm.
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$ 182.08
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1-2 weeks delivery time SeaSure 01.04 is a 25 mm single high-load block for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The hollow rivet at the top is rounded to allow rope to be spliced around it. SeaSure specifies a maximum rope diameter of 4 mm.
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$ 169.11
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1-2 weeks delivery time SeaSure 01.08 is a 25 mm spar mounted high-load block designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The block is fixed directly to a spar using 5 mm bolts or rivets. SeaSure specifies a maximum rope diameter of 4 mm.
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$ 154.58
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1-2 weeks delivery time SeaSure 01.10 is a 25 mm in-line mast high-load block designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The block is designed for in-deck / mast installation and is fixed using 5 mm bolts or rivets. SeaSure specifies a maximum rope diameter of 4 mm.
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$ 146.24
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1-2 weeks delivery time SeaSure 01.12 is a 25 mm in-line mast sheave block designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The block is intended for in-deck / mast installation and is fixed using 5 mm bolts or rivets.
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$ 178.08
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1-2 weeks delivery time SeaSure 01.14 is a 25 mm deck lead high-load block designed for medium- to high-load applications with slow-running ropes. It uses a brass sheave with stainless steel side plates and a simple plain bearing, with an MBS / breaking load of 950 kg and an SWL of 475 kg. The block is designed for direct mounting to a flat surface using 5 mm bolts or screws and is commonly used with Dyneema, Spectra and Kevlar lines. Maximum rope diameter is 5 mm according to the supplied catalogue data.
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$ 154.58
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1-2 weeks delivery time SeaSure 01.16 is a 25 mm general purpose high-load block for slow-running rope applications. It features a chrome-plated brass sheave, a plain chrome-plated brass bearing running on stainless steel, and an electropolished 316 stainless steel body with hollow rivet. The block is suitable for ropes up to 5 mm and has an MBS / breaking load of 950 kg with an SWL of 475 kg. Typical applications include halyards, outhauls, kicking straps, cunninghams, traveller control lines and leech lines.
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$ 148.56
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1-2 weeks delivery time SeaSure 01.18 is a 25 mm single bolt down high-load block designed for slow-running rope applications. It features a chrome-plated brass sheave, a plain chrome-plated brass bearing running on stainless steel, and an electropolished 316 stainless steel body with hollow rivet. The block is suitable for ropes up to 5 mm and has an MBS / breaking load of 950 kg with an SWL of 475 kg. Typical applications include halyards, outhauls, kicking straps, cunninghams, traveller control lines and leech lines.
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$ 30.36
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1-2 weeks delivery time SeaSure 03.50 is a stanchion mounted turning block with a 316 stainless steel body and nylon sheave, designed for routing furling headsail lines back toward the cockpit. Its hinged mounting action allows the sheave to align with the direction of the rope as it leaves the furling drum, helping maintain a clean lead angle. The stainless steel construction is designed for low-maintenance marine use.
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$ 89.04
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1-2 weeks delivery time SeaSure 03.52 is a hinged lead block designed for guiding furling lines from the furling system back toward the cockpit. It features a polished 316 stainless steel body, a single nylon sheave and a simple bearing, and is suitable for ropes up to 10 mm. The hinged action allows the sheave to align with the rope as it leaves the furling drum, while the removable sheave makes the block suitable for continuous-line reefing systems.
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$ 94.47
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1-2 weeks delivery time SeaSure 03.51 is a hinged stanchion turning block designed for sharply angled stanchion installations and for routing furling headsail lines back to the cockpit. It features a 316 stainless steel body with a nylon sheave and hinged action that allows the sheave to align with the rope as it leaves the furling drum. The block is suitable for stanchions with a 25 mm diameter and ropes up to 10 mm.
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$ 105.57
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1-2 weeks delivery time SeaSure 03.45 is a 26 mm spare sheave with bush designed for SeaSure stanchion turning blocks. It is compatible with block models 03.48, 03.50, 03.51, 03.52 and 13.53, providing a direct replacement component for maintaining smooth line movement in furling line systems. The spare sheave is supplied as a single piece.
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$ 34.34
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What are the key features of the SeaSure general purpose block and how does it perform in marine environments?
The SeaSure general purpose block, part of the 25mm bearing block range, is designed for high-load applications, making it ideal for use with abrasive ropes and systems requiring reliable performance. Featuring robust construction with steel side plates and rivets, the block ensures durability and smooth operation in marine environments. Its versatile design allows it to be used in various applications, from rigging systems to lifting mechanisms, offering efficient performance even under demanding conditions.
How do customer reviews reflect the durability and performance of SeaSure blocks in different marine environments?
Customer reviews highlight the durability and performance of SeaSure blocks, particularly the 25mm plain bearing block, which is praised for its robust construction, including features like steel side plates and rivets with an arnite coating. Reviewers consistently note how well these blocks handle high loads, even when used with abrasive ropes in demanding marine environments. The positive feedback reflects their reliability in both recreational and industrial applications, with users appreciating their smooth operation and resistance to harsh conditions like saltwater and UV exposure.
How does the plastic construction of SeaSure blocks compare to other materials in terms of durability and strength?
The plastic construction of SeaSure blocks offers a lightweight and cost-effective solution while maintaining strong durability for many marine applications. Compared to traditional materials like metal, plastic blocks are resistant to corrosion from saltwater and are less prone to rust, making them ideal for extended use in harsh marine environments. While plastic blocks may not have the same tensile strength as stainless steel, their design and use in systems such as high-load applications and abrasive rope handling ensure reliable performance when properly selected.