57
3035
3036
3037
3038
3224
3238
3251
3259
3264
3396
3239
3252
3260
3265
1984
1981
Sideload bearing strips dampen 
rig vibration.
Air Runner Blocks
Runners are used on running backstays of offshore boats 
to adjust mast bend for different wind conditions. 
Integrated sideplate bails and recessed cotter key help 
produce a smooth design that won’t snag lifelines. 
Foam padded Block Socks easily install over Air Runner blocks to 
protect your blocks, deck, and crew.
About Black Magic Air blocks: see feature pages at beginning of this section.
Crossover Blocks
Crossover blocks provide a cleaner, more efficient 
deck. These easy-to-install blocks mount behind the 
stopper bank on each side of the cabin house and 
can route any line to the winch on the opposite side. 
Blocks feature built-in risers and sculpted backing 
plates. The large, strong bases protect
cored decks. Use the 1984 for boats to 11.5 m 
(38') and the 1981 for boats to 15 m (48').
Runner Blocks
Block Socks
Fastener included.
Block Socks
Part No.
Fits
3035
3224/3238/3239
3036
3251/3252
3037
3259/3260
3038
3264/3265
Part
No.
Description
Sheave
Ø
Length
Weight
Clevis pin
Ø
Max line
Ø
Maximum
working load
Breaking
load
in
mm
in
mm
oz
g
in
mm
in
mm
lb
kg
lb
kg
45 mm 
 3396 
 Single
 1 3/4 
 45 
 2 13/16 
 71 
 2.89 
 82 
 5/16 
 8 
3/8 
 10 
1653
750
3306
1500
 57 mm 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3224 
 Single 
 2 1/4 
 57 
 3 3/8 
 86 
 4.42 
 125 
 3/8 
 10 
 1/2 
 12 
 2500 
 1134 
 5000 
 2268 
 75 mm 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3238 
 Single 
 2 15/16 
 75 
 4 5/8 
 118 
 10.16 
 288 
 1/2 
 12.7 
 9/16 
 14 
 5000 
 2268 
 10000 
 4536 
 3239 
 Single/becket 
 2 15/16 
 75 
 5 3/4 
 146 
 11.2 
 318 
 1/2 
 12.7 
 9/16 
 14 
 5000 
 2268 
 10000 
 4536 
 100 mm 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3251 
 Single 
 3 15/16 
 100 
 6 3/16 
 157 
 17 
 481 
 5/8 
 15.9 
 5/8 
 16 
 7500 
 3402 
 15000 
 6804 
 3252 
 Single/becket 
 3 15/16 
 100 
 7 9/16 
 193 
 19.12 
 542 
 5/8 
 15.9 
 5/8 
 16 
 7500 
 3402 
 15000 
 6804 
 125 mm 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3259 
 Single 
 4 15/16 
 125 
 7 11/16 
 195 
 29.76 
 844 
 3/4 
 19 
 3/4 
 19 
 11000 
 4990 
 22000 
 9979 
 3260 
 Single/becket 
 4 15/16 
 125 
 9 1/2 
 240 
 33.52 
 950 
 3/4 
 19 
 3/4 
 19 
 11000 
 4990 
 22000 
 9979 
 150 mm 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 3264 
 Single 
 5 15/16 
 150 
 8 3/4 
 221 
 50.64 
 1436 
 3/4 
 19 
 1 
 25 
 15000 
 6804 
 30000 
 13608 
 3265 
 Single/becket 
 5 15/16 
 150 
 10 13/16 
 275 
 56.72 
 1608 
 3/4 
 19 
 1 
 25 
 15000 
 6804 
 30000 
 13608 
Part
No.
Description
Sheave
Ø
Base
Ø
Height
Weight
Max line
Ø
Maximum
working load
Breaking
load
in
mm
in
mm
in
mm
oz
g
in
mm
lb
kg
lb
kg
 1981  Crossover 
 2 3/16 
 56 
 2 5/8 
 66 
 1 7/16 
 36 
 8 
 227 
 7/16 
 12 
 3000 
 1361 
 6000 
 2722 
 1984  Crossover 
 1 3/4 
 44 
 2 1/16 
 52 
 1 1/4 
 32 
 4.2 
 119 
 3/8 
 10 
 2000 
 907 
 4000 
 1814 

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