Size 1 30mm blocks

A strong, lightweight range of blocks for use on dinghies and dayboats or as lead blocks on larger craft.
Overview
Sheave size Sheave size 30mm x 11mm (1 3 /16 x 7/16")
Max rope diameter Max rope diameter 8mm ( 5 /16")
Break load SWL 350Kg (771 lbs)
Break load Break load 700Kg (1543 lbs)
Max rolling load Max rolling load (ball bearing blocks) 245kg 540 lbs)
   
All available with plain or ball bearing sheaves:

Plain bearing blocks
Barton plain bearing blocks have a precision moulded acetal sheave running on a large diameter brass bearing, ensuring free running under the highest of loads.

Ball bearing blocks
With our unique super-low friction ball race systems, featuring acetal sheaves and delrin ball bearings, running on a large diameter centre boss. This allows us to fit more load-bearing balls, which ensure extremely low friction performance, even under high loads.

Important note - break loads
Where break and safe working loads are stated, it is assumed that all sheaves are evenly loaded as in a purchase tackle. Uneven loading, or loading of one sheave in a double or triple block, will severely affect strength quoted. If unsure, please seek further assistance.

Maximum rolling load on ball bearing blocks is the maximum free running load before ball bearings will distort.

Fixed Eye Clevis Pin
Fixed Eye
Reverse Shackle
Swivel
Becket
Fixed Eye Clevis Pin Fixed Eye Reverse Shackle Swivel Becket
A simple, low priced fixed eye block with removable clevis pin for attachment. Pin Ø 5mm. Width between straps 13mm. With plain attachment eye. Removable shackle that can be set in-line or at 90° to the sheave. Fully swivelling head with removable shackle. All the appropriate 30mm blocks are available with or without becket.
  Plain sheave   ball-bearing sheave Length mm
Weight (g)
        plain ball
Single size 1 blocks
Plain sleave
Ball-bearing sleave
Length
Weight (g)
Single - fixed eye clevis pin 01 090   11 090 78 48 46
Single - fixed eye clevis pin + becket 01 091   11 091 87 52 51
Single - fixed eye 01 110   11 110 70 41 40
Single - fixed eye 01 111   11 111 80 46 44
Single - reverse shackle 01 120   11 120 82 51 49
Single - reverse shackle + becket 01 121   11 121 93 56 55
Single - swivel 01 130   11 130 85 57 55
Single - swivel + becket 01 131   11 131 98 61 60
Single - upright 01 150   11 150 53 64 62
Single - upright with fairlead 01 151   11 151 63 70 78
lightweight lead block 01 160   11 160 55 21 20
Single - stand up block 01 170   11 170 79 62 60
Single - spinnaker lead 01 180   11 180 114 59 57
Single - lightweight lead block 01 190   11 190 44 20 18
Double size 1 blocks            
Double - fixed eye 01 210   11 210 69 65 63
Double - fixed eye + becket 01 211   11 211 78 71 69
Double - reverse shackle 01 220   11 220 83 77 73
Double - reverse shackle + becket 01 221   11 221 91 82 78
Double - swivel 01 230   11 230 90 83 80
Double - swivel + becket 01 231   11 231 99 88 85
Double - upright 01 250   11 250 53 89 86
Back to back swivel 01 280   11 280 118 81 78
Triple size 1 blocks            
Triple - reverse shackle 01 320   11 320 81 102 97
Triple - reverse shackle + becket 01 321   11 321 94 109 103
Triple - swivel 01 330   11 330 85 108 103
Triple - swivel + becket 01 331   11 331 98 112 108

Download drawings as PDFs.
Size 1 Block - 01 150 Dimensions
Size 1 Block - 01 160 Dimensions
Size 1 Block - 01 250 Dimensions