cad

Single block RF47109
cheekfrictionmax. wire rope ø 4 mm

Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 2
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 3
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 4
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 5
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 6
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 7
Single block - RF47109 - Ronstan - cheek / friction / max. wire rope ø 4 mm - image - 8
Add to favorites
Compare this product

fo_shop_gate_exact_title

Characteristics

Number of sheaves
single
Type
cheek, friction
Maximum wire rope diameter
max. wire rope ø 4 mm, max. wire rope ø 5 mm
Application domain
for sailboats
Working load

4,410 lb, 8,820 lb, 15,430 lb
(2,000.3 kg, 4,000.7 kg, 6,998.9 kg)

Breaking load

8,820 lb, 17,640 lb, 30,860 lb
(4,000.7 kg, 8,001.4 kg, 13,997.9 kg)

Weight

165 g, 365 g, 753 g
(6 oz, 13 oz, 27 oz)

Description

Single sheave high load snatch block with rotating cheeks and SK99 Dyneema® loop FEATURES Soft shackle retained by elastomer guides. Aluminium dog bone allows for easy attachment and removal of the block. Cheek plates twist to open the block and close with spring loaded ball lock securing in place. Self-lubricating bearing and thrust washers for optimum dynamic and static performance Designed from the outset to deliver outstanding performance, these blocks achieve the highest ratings for dynamic load vs sheave diameter in our keelboat block range. They are built to perform and built to last. Every SA Block features fully machined, anodised aluminium cheek plates. Sheaves run on duplex stainless steel hubs and incorporate precision composite journal bearings and thrust washers. The soft attachment is a purpose designed Dyneema® SK99 cord shackle with aluminium dog bone. SA Snatch Blocks incorporate a full contact, selflubricating composite journal bearing running on a polished duplex stainless steel hub, to maintain low friction performance under heavy dynamic and static loads. Thrust washers in the same composite material are positioned between the sheave and the cheek plates to handle the high side loads that can be generated when line entry and exit alignment is not ideal. Testing has shown reduced friction and greater durability than ball bearings in this application Attach, detach and open The soft shackle provides a simple means of attachment, secured with the aluminium dog bone but easily opened when necessary to detach the block. With the shackle open a gentle rotation of the cheek plates opens the head of the block so it can be fitted to a standing line.

VIDEO

Catalogs

Exhibitions

Meet this supplier at the following exhibition(s):

METSTRADE 2025
METSTRADE 2025

18-20 Nov 2025 Amsterdam (Netherlands) Hall 5 - Stand 431

  • More information
    Salone Nautico 2025
    Salone Nautico 2025

    28 May - 01 Jun 2026 Venezia (Italy)

  • More information
    *Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.