Blue Shark 2250 38mm Single Swivel Block, 2-Pack — 3/8 in Line Capacity, 900 lb SWL

The Blue Shark 2250 38mm single swivel block is a compact, corrosion-resistant sailing pulley built for 3/8" (10 mm) lines, rated 900 lb safe working load and sold as a two-pack.

Designed for sailors who need reliable hardware without excess bulk, the 2250 block pairs a 6061T6 aluminum shell and 316 stainless steel fittings with Delrin bearings for smooth line travel. Its hard-anodized finish and preservative treatment help it resist saltwater corrosion, while the interchangeable swivel head options—fixed 0°, fixed 90°, or full 360°—give flexible rigging choices for sheets, control lines, and halyards.

How strong and reliable is the Blue Shark 2250 block?

This block balances light weight and load capacity: it carries a Safe Working Load (SWL) of 900 lbs and a tested breaking load of 2200 lbs, making it suitable for many small-to-medium sailing tasks. The 6061T6 aluminum body and 316 stainless steel hardware resist deformation and corrosion under repeated use.

• SWL: 900 lbs (408 kg)
• Breaking load: 2200 lbs (998 kg)
• Material: 6061T6 aluminum alloy with hard-anodized coating
• 316 stainless steel fittings for marine exposure

What line sizes and bearing type does it accept?

The sheave accepts up to a 3/8" (10 mm) rope, which covers most common sheets and control lines on dinghies and small keelboats. Delrin ball bearings reduce friction and wear, so lines run smoother and blocks stay quieter under load.

• Maximum line capacity: 3/8" (10 mm)
• Sheave diameter: 38 mm for consistent rope contact
• Bearings: Delrin ball bearings for low friction and long life

How does the swivel head affect installation and performance?

The 2250 offers a multi-position swivel head: choose a fixed 0° or 90° position or allow a full 360° rotation to follow changing line angles. This adaptability makes installation easier and reduces chafe by letting the block align itself with the lead of the line.

• Options: fixed 0°, fixed 90°, or free 360° swivel
• Reduces line twist and improves alignment
• Quick adjustment for different rigging setups

What maintenance and environmental resilience should I expect?

Low-maintenance design combines corrosion-resistant alloys, a twice-thick anodized surface, and preservative treatment so routine rinsing and periodic inspection are usually sufficient. The Delrin bearings do not corrode like metal bearings, but keeping grit and sand out of the sheave will extend service life.

• Finish: double-thick anodized hard coating for wear resistance
• Hardware: 316 stainless steel resists saltwater corrosion
• Care: rinse with fresh water; inspect bearings and sheave for debris

Who is this for? The Blue Shark 2250 38mm single swivel block (2-pack) is aimed at weekend racers, cruising sailors, and boat owners upgrading control lines on dinghies or small keelboats. If you need a compact, strong block that tolerates saltwater and gives flexible attachment angles for sheets, halyards, or control leads, this block is a practical, corrosion-conscious choice.