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50mm Dynamic Blocks

Allen 50mm dynamic blocks offer low friction performance in a lightweight body. Built to suit the more demanding applications on dinghies and sports catamarans. Also, a great choice for fast running control lines and sheets on keelboats. Available with a wide range of accessories and features.

Swivel Lock - Single variations feature a built in swivel lock switch, located at the head of the block. Muti sheave options feature a removable swivel lock moulding.  

Dynamic Bearings - Twin rows of stainless steel ball bearings running on a stainless steel rail provide superior rolling speeds and durability. Great for fast running lines.

Becket – The hole through the middle of the block can be used as a tying off point (becket).

Maximum Working Load – If exceeded the block may not perform as designed. Breaking Load – The load at which a major block failure is likely to occur. 


Block Configuration

  • Tii-On
  • Hook
  • Swivel
  • Becket
  • Cheek

Sheave Type

  • Single
  • Triple
  • Double
  • Quad
  • Quint
  • Clear All
SKU Title breaking load kglength mmmaximum line diameter mmmaximum working load kgshackle pin mm Weight g Price
A2050 50mm Single 90095103004 73 £48.97
A2050C Single Cheek Block 9009610300- 80 £50.89
A2050Tii- Single Tii-On 9007210450- 61 £48.97
A2052 50mm Double 950100104504 148 £99.95
A2053 Double With Becket 950136104504 160 £103.88
A2054 50mm Triple 950100104704 190 £141.50
A2054HK Triple Block w/Hook 950140104704 227 £156.32
A2055 Triple With Becket 950136104704 223 £145.39
A2056 50mm Quad 950100104705 269 £185.72
A2057 Quad With Becket 950136104705 274 £196.66
A2059 50mm Quint Block 950100104705 323 £217.88
A2156 Cheek Adaptor For 50mm Block. -95--- - £6.02