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INSTRUCTIONS

Protexit

 

 

Blocks

WARNING! Strictly follow all instructions to avoid an accident, damage to your 

vessel, personal injury or death. See www.harken.com/manuals for additional 

safety information.

USA

 

 

Tel:

 (+01) 262-691-3320 • 

Web:

 www.harken.com • 

Email:

 [email protected] 

Italy

 

 

Tel:

 (+39) 031.3523511 • 

Web:

 www.harken.it • 

Email:

 [email protected]

Features

Strong, durable unibody top/side plates 

- hardcoat anodized forged aluminum. 

Sculpted top plate 

- protects sheave and sheds line.

Tough sheaves 

- machined from hardcoat anodized solid aluminum.

 

Proven bearing system - 

composite sleeve bearing with sideload ball bearings.   

High load drop-in replacement - 

30 mm blocks replace Bullet

® 

blocks. Larger blocks fit common 

cutout and hole spacing allowing easy replacement. 

Terms

1

Reeving side

Part number 

Maximum line diameter 

Maximum working load

Sheave

Sideplate

Block Loading vs Angle of Deflection

180

°

150

°

30

°

90

°

Block load increases when the line turns at a greater angle. Block loads double when the line turns 

180°. If there is 400 kg (880 lb) on the line and the angle of deflection is 180°, the Harken through-

deck block is subject to 800 kg (1760 lb). Select blocks carefully. See specification chart on 

next page.  

Angle of  

deflection

Load factor

Angle of  

deflection

Load factor

Angle of  

deflection

Load factor

30°

52%

90°

141%

150°

193%

45°

76%

105°

159%

160°

197%

60°

100%

120°

173%

180°

200%

75°

122%

135°

185%

Top plate

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