RWO R1420 25mm Single Bullet Block for 8mm Rope
R1420
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RWO R1420 25mm Bullet Block
Single Plain-Bearing Block | 8mm Maximum Line | 650kg Breaking Load
The RWO R1420 is a lightweight single bullet block for general-purpose dinghy, sailing and light marine control-line systems. Polished stainless-steel side plates surround a self-lubricating acetal sheave, with an 8mm loop for attachment.
Key Features
- ✔ 25mm self-lubricating acetal sheave
- ✔ Polished stainless-steel side plates
- ✔ Plain-bearing, maintenance-free design
- ✔ 8mm attachment loop
- ✔ Compact weight of approximately 16g
Technical Specs
| Manufacturer | RWO Marine |
| Part number | R1420 |
| Block type | Single bullet / loop head |
| Sheave diameter | 25mm |
| Maximum line diameter | 8mm |
| Attachment loop | 8mm |
| Bearing type | Plain bearing |
| Published breaking load | 650kg |
| Weight | Approx. 16g |
| Pack quantity | 1 |
Compatibility / Fitment Guide
| Check | Required specification | Fitment decision |
|---|---|---|
| Running line | Conventional rope up to 8mm diameter | Do not use the older 10mm claim for this R1420 model. |
| Attachment | Compatible shackle, splice or eye-strap arrangement through the 8mm loop | Attachment hardware must have an adequate working-load rating and articulate freely. |
| Load | Engineered working load below the 650kg breaking load | Apply a suitable design/safety factor; RWO does not state 650kg as the working load. |
| Alignment | Fair lead through the 25mm sheave without side loading | Misalignment or chafe reduces service life and effective capacity. |
| Application | Small-boat running rigging and general control-line systems | Verify sheave size, line construction and load before replacing a different block. |
Not suitable for: rope over 8mm, wire rope, shock-loaded or safety-critical lifting systems, lifting people, or any use that treats the breaking load as a working-load limit.
Part Number Cross Reference
| Manufacturer part number | RWO R1420 |
| 4Boats SKU | R1420 |
| Related model | R1430 is the separate 10mm-loop version; it is not this product |
| Product family | RWO Stainless Blocks 25 |
Frequently Asked Questions
What is the maximum rope diameter?
8mm for R1420.
Can I work at 650kg?
No. 650kg is the breaking load. Select a substantially lower working load using the correct safety factor.
Is it suitable for wire rope?
No. The acetal sheave is specified for conventional rope.
How is it attached?
The 8mm loop can accept a suitable shackle or properly engineered splice/eye-strap arrangement.
Pre-installation check: Verify line diameter, expected dynamic load, safety factor, attachment hardware and lead angle.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
