2025 Ronstan Marine Catalogue - Catalog - Page 11
SPORTS BLOCKS
Series 20 Orbit
9
RF25109HL
RF25309
RF25209
RF25109
RF25209HL
RF21107
RF25151
RF21107
with webbing
attachment
1 x 5mm (3/16”)
1 x 3mm (1/8”)
RF9003-07
Lashing line must pass through the
hub with a tight splice in the head
or cross over before lashing to a
fixing point.
RF21107
with Dyneema®
link attachment
Ball bearing blocks have a 2-stage ball
bearing system.
RF21107 suits up to 10mm (3/8”) webbing or
RF9003-07 Dyneema® link.
BB Sheave: High compression strength acetal.
Hollow hub for becket take-off.
Control lines.
HHL sheave and bearing race: Grade 2205 stainless
steel, ball bearings: Grade 304 stainless steel.
Suit up to 4mm (5/32”) lashing.
Leech lines & cunninghams.
Frame/cheeks: Toughened nylon.
RF25109HL & RF25209HL ideal for higher load
applications.
Cascading vangs.
Load straps (RF21107): Grade 316 stainless steel.
Kite bridles.
Frame/cheeks (RF21107): Toughened, glass fibre
reinforced nylon.
Dyneema® lashing line supplied with singles
RF25109 & RF25109HL.
PRODUCT No.
DESCRIPTION
Ball Bearing
RF21107
Single block, becket hub, suits 10mm (3/8”) webbing
Single block, becket hub, incl. 750mm (30”) x 1.7mm (1/16”) diameter,
RF25109
Dyneema® lashing line
RF25209
Double block, becket hub
SHEAVE
DIAM.
mm
MAX.
ROPE
mm
M.W.L.
kg
B.L.
kg
WEIGHT
g
20
5
200
400
14
20
6
*1
250
*3
550
SHEAVE MAX.
DIAM. ROPE
in.
in.
9
3/4
3/4
3/16
1/4
M.W.L.
lb
B.L.
lb
WEIGHT
oz
440
880
0.5
*1
1210
0.3
*3
550
20
6
300
800
14
3/4
1/4
660
1760
0.5
RF25309
Triple block, becket hub
20
6
300*3
800
21
3/4
1/4
660*3
1760
0.7
RF25151
Cheek block
20
6
250
550
8
3/4
1/4
550
1210
0.3
20
6
300*2
900
14
3/4
1/4
660*2
1980
0.5
20
6
450*3
900
26
3/4
1/4
990*3
1980
0.9
High Grade Stainless Steel Sheave
Single block, becket hub, incl. 750mm (30”) x 2.0mm (3/32”) diameter,
RF25109HL
Dyneema® lashing line
Double block, becket hub, HHL
RF25209HL
Accessories
RF9003-07
Dyneema® link to suit RF21107
*1 Block must be lashed through hub. The supplied lashing line must have three passes through head and hub to achieve rated load.
*2 Block must be lashed through hub. The supplied lashing line must have two passes through head and hub to achieve rated load.
*3 Both the MWL and BL are dependent on the strength of the line used to lash the block through the central hub. Refer to the SUPPORT page at www.ronstan.com for lashing instructions.
