• RA 40 Master Automatic Ratchet Block

Exclusive patented design offers both full automatic and manual modes in simply one block. The new design  simplifies all control switches to the one. The unique Master Automatic Ratchet Block can easily switch among two modes by single switch.


The Sheave automatically changes from off mode to ratchet mode when loads increase. Sailors are available to control lines whenever they need the ratchet function. Manual switch to ratchet, off, or always-on modes by controlling button.


The high strength composite sideplates are lightweight and strong to provide excellent weather-ability for maximum protection. NC machined sheaves with 8 faces give Master Automatic Ratchet Block extremely holding power to line movement. A patented Lock-up system can be easily engaged to in either or two directions, or free to swivel. Exclusive composite Ball Bearing provides sheaves with good rotation and less friction.

Sheave Ø (mm)40 mmMaximum line Ø (in)3/8 in
Sheave Ø (in)9/16 inMaximum working load (kg)150 kg
Maximum line Ø (mm)10 mmMaximum working load (lb)330 lb
Sheave Ø (mm)40 mm
Sheave Ø (in)19/16 in
Length (mm) mm
Length (in) in
Weight (g)60 g
Weight (oz)2.12 oz
Maximum line Ø (mm)10 mm
Maximum line Ø (in)3/8 in
Fasteners (mm) mm
Fasteners (in) in
Maximum working load (kg)150 kg
Maximum working load (lb)330 lb
Breaking load (kg)500 kg
Breaking load (lb)1102 lb

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RA 40 Master Automatic Ratchet Block

  • Brand: Master
  • Product Code: RA-0401F
  • Availability: In Stock
  • €56.17

  • Ex VAT: €47.20