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
Sheave Boxes
Allen sheave boxes, or exit blocks as they're also known, are designed to meet the demands of performance sailing, offering a choice of plain bearing or ball bearing sheaves to suit your specific application. To provide optimal durability and efficiency, we offer sheaves in a range of materials, including Acetal, stainless steel, and aluminium.
Perfectly suited for halyard systems, control line systems, and general running rigging, Allen sheave boxes are built to handle a variety of applications on boats up to 30ft.
Please note: Working and breaking loads depend on the installation method of the sheave box.
Filters:
Body Material
- Cast Aluminium
- Milled Aluminium
- Nylon
Sheave Diameter
- 20
- 25
- 36
- 38
- Clear All
| SKU | Title | breaking load kg | fixing hole centres mm | fixing hole diameter mm | line diameter mm | maximum working load kg | sheave diameter mm | sheave material | sheave width mm | slot size mm | Length mm | Weight g | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |
A...6- | Aluminium Sheave Box - Large | 800 | 65 | 4 | 3 - 6 | 400 | 38 | Acetal / Stainless Steel | 8 | 52 x 15 | 76 | 34 | £14.22 |
 |
A...8- | Nylon Sheave Box - Large | 700 | 80 | 4 | 3 - 11 | 350 | 38 | Acetal / Aluminium | 12 | 70 x 22 | 100 | 41 | £11.20 |
 |
A...9- | Aluminium Sheave Box - Medium | 670 | 57 | 4 | 3 - 6 | 300 | 25 | Acetal | 8 | 44 x 13 | 66 | 21 | £11.17 |
 |
A..15- | Low Profile Sheave Box - Small | 750 | - | 4 | 3 - 5 | 300 | 25 | Acetal / Stainless Steel | 6 | 38 x 10 | 53 | 12 | £15.72 |
 |
A..16- | Low Profile Sheave Box - Medium | 900 | - | 5 | 3 - 6 | 400 | 38 | Acetal / Stainless Steel | 6 | 58 X 13 | 85 | 36 | £22.78 |
 |
A..94 | Nylon Mast Head Sheave Box - Plain Bearing | - | - | To Fit 20mm Tube | - | 36 | Acetal | 6 | - | - | 40 | £42.38 | |
 |
A4420-4215 | 20mm Exit Sheave Box | 500 | 62 | 5 | 3 - 6 | 250 | 20 | Acetal / Stainless Steel | 8 | 42 x 15 | 77 | 29 | £39.88 |
 |
A4430-4716 | 30mm Exit Sheave Box | 600 | 60 | 5.2 | 4 - 8 | 300 | 30 | Acetal / Stainless Steel | 10 | 47 x 16 | 75 | 35 | £44.87 |
 |
A4438-5415 | Wire Exit Sheave Box | 900 | 72 | 5 | 4 - 7 | 600 | 38 | Acetal / Stainless Steel | 7 | 54 x 15 | - | - | £49.87 |
|
A4438-5818 | 38mm Exit Sheave Box | 900 | 76 | 5 | 4 - 8 | 600 | 38 | Acetal / Stainless Steel | 10 | 58 x 18 | 76 | 29 | £49.87 |
 |
SA..94 | Adaptor For A..94 | - | - | To Fit 35mm Tube | - | - | - | - | - | - | 18 | £15.80 |