3" Blocks

Hexaratchet Ratchet Block, Single with Reverse Rotation, 750lb. SWL, 8.5oz. from HARKEN
Larger version of the Little Hexaratchets with the same Teflon®-impregnated aluminum sheave. Easy to operate on/off button, and 3-way head system. Holding power of 15:1 with 180° wrap. Sheave: Teflon impregnated Hardkote anodized aluminum. Bearings: Delrin. Sheave Size: 3" (76mm). Line Diameter: 7/16" max. Shackle/Strap Type: Stamped swivel shackle with three-way head.
$67.75

3" Block, Single Wire, 850lb. SWL, 9.5oz. from HARKEN
Designed for small to medium-sized offshore boats, catamarans, etc. Large diameter sheaves reduce the friction caused by bending a line over a small sheave. All feature three-way head system and removable beckets. Sheave: Hardkote anodized Teflon-impregnated aluminum. Ball Bearings: Delrin ball bearings/Hi-Load wire blocks: Torlon ball bearings. Sheave Size: 3" (76mm). Line Diameter: 7/16" max. Cheek Material/Finish: Plastic/Stainless steel.
$73.31

3" Block, Heavy-Duty Single, 750lb. SWL, 8.0oz. from HARKEN
Designed for small to medium-sized offshore boats, catamarans, etc. Large diameter sheaves reduce the friction caused by bending a line over a small sheave. All feature three-way head system and removable beckets. Sheave: Hardkote anodized Teflon-impregnated aluminum. Ball Bearings: Delrin ball bearings/Hi-Load wire blocks: Torlon ball bearings. Sheave Size: 3" (76mm). Line Diameter: 7/16" max. Cheek Material/Finish: Plastic/Stainless steel.
$58.27

3" Block, Heavy-Duty Single with Becket, 750lb. SWL, 8.5oz. from HARKEN
Designed for small to medium-sized offshore boats, catamarans, etc. Large diameter sheaves reduce the friction caused by bending a line over a small sheave. All feature three-way head system and removable beckets. Sheave: Hardkote anodized Teflon-impregnated aluminum. Ball Bearings: Delrin ball bearings/Hi-Load wire blocks: Torlon ball bearings. Sheave Size: 3" (76mm). Line Diameter: 7/16" max. Cheek Material/Finish: Plastic/Stainless steel.
$69.70

Series 30 Block, Single/Loop Head/Becket, 660 SWL, 1.1oz. from RONSTAN
Like Ronstan Series 20 blocks, but with larger (1-3/16") sheave diameter, higher SWL and Acetyl–not stainless steel–bearings. High-Load (HL) blocks feature a Nylatron® sheave suitable for both rope and wire. Sheave: UV-stabilized acetal. Ball Bearings: Two-stage acetal system. Sheave Size: 1-3/16"dia. Line Diameter: 5/16" max. Cheek Material/Finish: Stainless and textured fiber-reinforced Zytel.
$13.49

Series 20 Block, Single with Loop Head, 550lb. SWL, 0.5oz. from RONSTAN
Two-stage bearing system with stainless-steel ball bearings handles very high safe working loads. Designed for small diameter, high-tech line on high-performance dinghies and control lines on sport and race boats. Each double and triple block offers a formed loop head and extra shackle for mounting versatility. Sheave: Acetal plastic. Sheave Size: 3/4" (20mm). Line Diameter: 1/4" max. Cheek Material/Finish: Stainless and textured fiber-reinforced Zytel.
$9.24 $10.16

Big Bullet Block, Single with Swivel & Becket, 300lb. SWL, 2.5oz. from HARKEN
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$28.65 $28.65

57mm Sheave Diameter Block, Single/Swivel/Becket Style, 792lb. SWL from HARKEN
From the folks who invented ball bearing blocks, this line of blocks boasts an excellent strength-to-weight ratio. 29mm doubles and triples feature a U-lock to hold the swivel in the front or side position, or allow it to spin freely. Use the 40mm blocks for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats. The 57mm blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards and control lines.
$37.19

40mm Sheave Diameter Block, Triple/Swivel/Cam Style, 750lb. SWL from HARKEN
From the folks who invented ball bearing blocks, this line of blocks boasts an excellent strength-to-weight ratio. 29mm doubles and triples feature a U-lock to hold the swivel in the front or side position, or allow it to spin freely. Use the 40mm blocks for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats. The 57mm blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards and control lines.
$129.12

57mm Sheave Diameter Block, Single/Swivel/Cam Style, 300lb. SWL from HARKEN
From the folks who invented ball bearing blocks, this line of blocks boasts an excellent strength-to-weight ratio. 29mm doubles and triples feature a U-lock to hold the swivel in the front or side position, or allow it to spin freely. Use the 40mm blocks for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats. The 57mm blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards and control lines.
$92.57

29mm Sheave Diameter Block, Single/Swivel/Becket Style, 330lb. SWL from HARKEN
From the folks who invented ball bearing blocks, this line of blocks boasts an excellent strength-to-weight ratio. 29mm doubles and triples feature a U-lock to hold the swivel in the front or side position, or allow it to spin freely. Use the 40mm blocks for jib and mainsheet systems on high-performance dinghies, and for high-load control lines on small keelboats. The 57mm blocks have an enormous working range that makes them ideal for main and jib sheets, spinnaker halyards and control lines.
$19.89