Description
This upright lead block with a 20mm sheave from Ronstan is typically used for halyards at the mast base.
Lead blocks are a low-profile solution for leading halyards or other rig sail controls back to cleats or jammers.
Ideal for high load applications. Manufactured with a wear-resistant Nylatron sheave – a lightweight self-lubricating polymer.
This upright block is suitable for use with rope or wire.
Features:
- High static and dynamic load capacity
- 316 Stainless Steel housing
- Light weight
- Cheek cutouts for easy bearing maintenence
- Fastening: 2 x 6mm (1/4″) – Not included
| SKU | Sheave Diameter | Max Rope Diameter | Max Working Load | Breaking Load | Weight |
|---|---|---|---|---|---|
| RON-RF20171 | 20mm | 6mm | 250kg | 550kg | 18 grams |

![Tip Top Teak Crystal Deck Cleaner – Half Gallon (4lbs 3oz) [TC 2001]](https://www.apartship.com/wp-content/uploads/2025/4/1745803555/tip-top-teak-crystal-deck-cleaner-half-gallon-4lbs-3oz-tc-2001-1745803559.webp)
![Sudbury Aqua Fresh – 8 Pack Box [830]](https://www.apartship.com/wp-content/uploads/2025/4/1745803555/sudbury-aqua-fresh-8-pack-box-830-1745803559.webp)
![Tip Top Teak Deck Brightener – Quart [TB 3001]](https://www.apartship.com/wp-content/uploads/2025/4/1745803555/tip-top-teak-deck-brightener-quart-tb-3001-1745803559.webp)
![Sudbury Elastomeric Marine Sealant – 10oz Cartridge – White [300]](https://www.apartship.com/wp-content/uploads/2025/4/1745803666/sudbury-elastomeric-marine-sealant-10oz-cartridge-white-300-1745803670.webp)