2025 Ronstan Marine Catalogue - Catalog - Page 71
KEELBOAT BLOCKS
Snatch Blocks
69
RF6751
RF6721
RF6711
RF6741
STAINLESS STEEL
SHEAVE
ALUMINIUM
SHEAVE
RF6720
RF6710
RF6730
Trunnion articulation provides correct lead in restricted
situations, such as toe-rail attachment.
ALUMINIUM
SHEAVE
Convenient solution for temporary
leads and line deflection.
Attachment point provided for a
shock cord suspension line.
Easily operated secure latch mechanism.
Temporary leads for sheets and reefing on
boats up to 12m (40ft).
Soft resilient cheeks reduce clatter and
protect gelcoat and painted surfaces.
Snap shackle head allows block to swivel
through 360°.
Blocks with trunnion snap shackles allow
additional articulation from side-to-side.
PRODUCT No.
DESCRIPTION
All Purpose
RF6710
RF6711
RF6720
RF6721
Snatch block, swivel snap shackle head
Snatch block, trunnion snap shackle head
Snatch block, swivel snap shackle head
Snatch block, trunnion snap shackle head
RF6730, RF6741: Grade 316 stainless steel frame, load
strap and needle roller bearings; hard coat anodised
alloy sheave; soft PVC cheeks.
RF6751: Grade 316 stainless steel frame, load strap,
sheave and needle roller bearings; soft thermoplastic
rubber cheeks.
Spare or replacement block for general use on larger
boats depending on line angle and load.
RF6710, RF6711, RF6720, RF6721: Grade 316 stainless
steel frame, load strap and hub; UV stabilised acetal
sheaves; soft thermoplastic rubber cheeks.
Temporary outboard sheet lead for
headsail trimming.
Snap shackles: Investment cast grade
15-5PH stainless steel.
Special Purpose - Roller Bearings
RF6730
Snatch block, aluminium sheave, roller bearings, swivel snap shackle head
RF6741
Snatch block, aluminium sheave, roller bearings, trunnion snap shackle head
RF6751
Snatch block, stainless steel sheave, roller bearings, trunnion snap shackle head
SHEAVE
DIAM.
mm
MAX.
ROPE M.W.L.
mm
kg
B.L.
kg
WEIGHT
g
SHEAVE
DIAM.
in
MAX.
ROPE M.W.L.
in
lb
B.L.
lb
WEIGHT
oz
51
51
64
64
12
12
12
12
425
425
850
850
850
850
1700
1700
250
260
480
510
2
2
2 1/2
2 1/2
1/2
1/2
1/2
1/2
935
935
1870
1870
1870
1870
3750
3750
8.8
9.2
16.9
18.0
45
45
80
16
16
19
1350
1275
2500
2700
2550
5000
550
610
1480
1 3/4
1 3/4
3 1/8
5/8
5/8
3/4
2970
2805
5500
5940
5610
11000
19.4
21.5
52.2
