78
077
A
B
1634
061
1634
010, 029
460, 461
369
370
A
B
097.PAIR
071.PAIR
1603.PAIR
B
A
460
461
010
1634: Midrange and ESP Cruising 
block stand-up base
Swivels and pivots freely
Blocks will not hit deck
*#10 (5 mm) FH fasteners.   ** 6 mm (1/4") RH fasteners. 
Stand-Up Bases
Stand-up bases allow a wide variety of blocks 
to be held upright, swivel freely, or pivot so lines 
have a fair lead under load.
Ball-and-Socket Swivel Bases
The ball-and-socket design lets blocks articulate up to 
45 degrees and swivel freely. The 460 and 461 bases 
have stainless steel reinforcement plates to handle the 
high load capacities of 57 mm and 75 mm Carbo blocks. 
Bases may be fitted with springs, but blocks won’t hit the 
deck without them.
Stanchion Mount Base
The 061 stanchion mount base attaches blocks 
to 22 mm or 25 mm (7/8" or 1") stanchions or pulpits 
and is often used to lead furling lines to the cockpit. 
Allows blocks to swivel and pivot for fairleads.
Midrange Cruising ESP Stand-Up
Use the 1634 stand-up base with Midrange blocks 
and 57 mm or 75 mm Cruising ESP blocks. Block head-
post fits into socket without shackle. The 
low-profile design is ideal for mastbase and 
halyard lead blocks.
Springs
Springs support blocks on padeyes, eyestraps, bases, 
and traveler cars, and prevent blocks from hitting the deck.
Stand-Up Boots
Made of durable, flexible PVC, stand-up boots hold 
blocks up without snagging lines. The 369 fits 40 mm 
and 57 mm Carbo and Black Magic blocks. The 370 
fits 75 mm Carbo blocks.
41 mm
1 5/8"
41 mm
1 5/8"
25 mm
1"
25 mm
1"
Bases
Base accessories
Part
No.
Description
Weight
A
B
Shackle pin
Ø
oz
g
in
mm
in
mm
in
mm
 071.PAIR Stand-up spring (pair)
 .32 
 9.1 
 2 
 51 
 7/8 
 22 
 
 
 077 
 DN adapter
 2.4 
 69 
 1/4 
 32 
 11/16 
 17 
 3/16 
 5 
 097.PAIR  Small stand-up spring (pair)
 .13 
 3.7 
 1 
 25 
 3/4 
 19 
 
 
 369 
 Small stand-up boot
 .45 
 12.7 
 2 
 51 
 1 9/16 
 40 
 
 
 370 
 Large stand-up boot
 1.1 
 30.8 
 2 5/8 
 67 
 2 3/16 
 55 
 
 
 1603.PAIR  Midrange stand-up spring (pair)
 .74 
 21 
 2 1/2 
 64 
 1 3/8 
 35 
 
 
Part
No. Description
Height
Weight
Base
Ø
Inside socket
Ø
Pin
Ø
Maximum
working load
Breaking
load
Use with
in
mm
oz
g
in
mm
in
mm
in
mm
lb
kg
lb
kg
 010  Ball/socket* 
 1 3/4 
 44 
 3 
 85  2 1/8  54 
 3/8 
 10 
 3/16 
 5 
 400 
 181 
 1300  590 
 2.25"/Little Fiddle/ratchets 
 061  Stanchion mount base 
 1 1/4 
 32 
 2 
 57 
 
 
 3/8 
 10 
 3/16 
 5 
 350 
 159 
 
 
 Bullet/Big Bullet/2.25"/ratchets 
 460  Ball/socket/high-load* 
 1 3/4 
 44 
 4  113  2 1/8  54 
 3/8 
 10 
 3/16 
 5 
 800 
 363 
 2500  1134 
 57 mm Carbo 
 461  Large ball/socket/high-load* 
 2 
 51 
 4.5  128  2 1/8  54 
 7/16 
 12 
 1/4 
 6 
 1000 
 454 
 2500  1134 
 75 mm Carbo 
 1634  Midrange/Cruising ESP stand-up** 
 1 15/16 
 49 
 9  255  2 7/8  73 
 9/16 
 15 
 5/16 
 8 
 3500  1588  7000  3175 
 Midrange/Cruising ESP 

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