Christmas Opening Hours
Please be advised that Allen Brothers will close at 15:00 on 20th December and reopen on 6th January.
Orders placed during this period will be processed upon our return.
Wishing you a Merry Christmas and a Happy New Year!
Product Range
Flip Flop Blocks
Flip flop blocks are designed to pivot around a central fixing point, this keeps the rope close to the deck, mast or boom whilst still allowing the block to articulate to the correct lead angle, ensuring friction stays as low as possible whilst still guiding the rope to where it needs to go.
We offer a range of 20, 30 and 40mm sheave sizes and with or without cam cleats.
Breaking Load - The load at which a major failure is likely to occur.
Working Load - Based on the maximum working load of the cam cleat.
| SKU | Title | breaking load kg | fixing hole centres mm | fixing hole diameter mm | maximum line diameter mm | maximum working load kg | sheave diameter mm | Length mm | Weight g | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
 |
A2123 | 20mm Flip Flop Block | 350 | 16 | 4 | 5 | 105 | 20 | - | 19 | £48.40 |
 |
A2123-677 | 20mm Flip Flop Block With A.677 Cam Cleat | 350 | 16 | 4 | 5 | 80 | 20 | - | 78 | £71.45 |
 |
A2123-77 | 20mm Flip Flop Block With A..77 Cam Cleat | 350 | 16 | 4 | 5 | 100 | 20 | - | 86 | £96.77 |
 |
A2133 | 30mm Flip Flop Block | 700 | 20 | 5 | 8 | 140 | 30 | - | 53 | £51.18 |
|
A2133-677 | 30mm Flip Flop Block With A.677 Cleat | 750 | 20 | 5 | 8 | 80 | 30 | - | 119 | £72.17 |
|
A2133-77 | 30mm Flip Flop Block With A..77 Cleat | 750 | 20 | 5 | 8 | 100 | 30 | - | 128 | £97.50 |
 |
A2143 | 40mm Flip Flop Block | - | 60.3 | 5 | 10 | 150 | 40 | - | 77 | £61.90 |
 |
A2143-676 | 40mm Flip Flop Block with Allenite Cam Cleat | 800 | 60.3 | 5 | 10 | 130 | 40 | - | 210 | £88.44 |
 |
A2143-76 | 40mm Flip Flop Block With Cam Cleat | 800 | 60.3 | 5 | 10 | 150 | 40 | - | 255 | £109.00 |
 |
A4988X | Lightweight Flip Flop Cleat With Removable Sheave | 170 | 85.5 | 5 | 6 | 100 | 30 | - | 108 | £62.18 |