I N S T R U C T I O N S
Mastbase Blocks
1988, 1990, 3123, C8508, 3192
Over-the-Top Blocks
3002, 3003, 3004, C8322, C8624
N15W24983 Bluemound Rd. • Pewaukee, WI 53072 U.S.A.
Telephone: (262) 691-3320 • Fax: (262) 701-5780
Web: www.harken.com • E-mail: [email protected]
Install 1988,1990, 3123, 3192 Mastbase Blocks
Part
No.
Block
Max
Line Ø
Maximum
Working Load
(MWL)
Breaking Load
(BL)
Purchase
Fasteners (FH)
A4 (316) or A2 (18-8)
stainless steel
Size
Type
Qty
1988
Mastbase
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
3
1990
Mastbase
1/2"
12 mm
5000 lbs
2273 kg
10000 lbs
4536 kg
5/16"
8 mm
Flathead
4
3123
Mastbase
11/16
"
18 mm
11000 lbs
4990 kg
22000 lbs
9980 kg
5/8"
16 mm
Hexhead
Bolt
2
C8508
Mastbase
3/4"
19 mm
15000 lbs
6804 kg
30000 lbs
13608 kg
5/8"
16 mm
Hexhead
Bolt
3
3192
Mastbase
5/8"
16 mm
13227lbs
6000 kg
26455 lbs
12000 kg
5/8"
16 mm
Hexhead
Bolt
3
3002 Over the top
single
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
2
3003 Over the top
double
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
4
3004 Over the top
triple
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
6
C8322 Over the top
single
1/2
"
12 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
5/8"
16 mm Flathead
2
C8624 Over the top
single
9/16"
14 mm
5000 lbs
2272 kg
10000 lbs
4536 kg
5/8"
16 mm Flathead
2
Strictly follow all instructions to avoid an accident, damage
to your vessel, personal injury, or death. See www.harken.com/
manuals for additional safety information.
Note: Install blocks so sheave is leaning away from mast.
“Harken”
will be towards mast. See drawing below.
1. Remove sheave.
Remove screw from port side of assembly. Pull
out centerpost from starboard side.
Tip:
Don’t worry about losing balls in sheave, they are captive. If
post is stuck, leave screw halfway in and push on screw head to
push post out port side.
2. Mark position of holes
. Keep “Harken” towards mast.
Flat in hole
retains post
Mast
Port Side: “Harken” must be towards mast.
Tip:
To make sure block is aligned with load, drill forward hole, insert
screw and sheave, run line to deck block and let block center itself.
Remove and drill other hole(s).
3. Mount carrier.
Drill holes and screw to deck using sealant, backing
plates, and locknuts.
1988, 1990
–
Do not overtighten screws; sheave
will bind.
Tip: Slightly bevel top of hole in deck to allow sealant to mass
near top of hole.
4. Installing sheave:
Slip post in from starboard side and seat end of shaft
in flat. Use blue Loctite
®
on screw threads and secure.
WARNING! You must mount to solid deck construction using speci-
fied fasteners in all mounting holes and nuts, washers or backing
plates to achieve correct maximum working load.
I N S T R U C T I O N S
Mastbase Blocks
1988, 1990, 3123, C8508, 3192
Over-the-Top Blocks
3002, 3003, 3004, C8322, C8624
N15W24983 Bluemound Rd. • Pewaukee, WI 53072 U.S.A.
Telephone: (262) 691-3320 • Fax: (262) 701-5780
Web: www.harken.com • E-mail: [email protected]
Install 1988,1990, 3123, 3192 Mastbase Blocks
Part
No.
Block
Max
Line Ø
Maximum
Working Load
(MWL)
Breaking Load
(BL)
Purchase
Fasteners (FH)
A4 (316) or A2 (18-8)
stainless steel
Size
Type
Qty
1988
Mastbase
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
3
1990
Mastbase
1/2"
12 mm
5000 lbs
2273 kg
10000 lbs
4536 kg
5/16"
8 mm
Flathead
4
3123
Mastbase
11/16
"
18 mm
11000 lbs
4990 kg
22000 lbs
9980 kg
5/8"
16 mm
Hexhead
Bolt
2
C8508
Mastbase
3/4"
19 mm
15000 lbs
6804 kg
30000 lbs
13608 kg
5/8"
16 mm
Hexhead
Bolt
3
3192
Mastbase
5/8"
16 mm
13227lbs
6000 kg
26455 lbs
12000 kg
5/8"
16 mm
Hexhead
Bolt
3
3002 Over the top
single
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
2
3003 Over the top
double
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
4
3004 Over the top
triple
3/8"
10 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
1/4"
6 mm
Flathead
6
C8322 Over the top
single
1/2
"
12 mm
2500 lbs
1136 kg
5000 lbs
2272 kg
5/8"
16 mm Flathead
2
C8624 Over the top
single
9/16"
14 mm
5000 lbs
2272 kg
10000 lbs
4536 kg
5/8"
16 mm Flathead
2
Strictly follow all instructions to avoid an accident, damage
to your vessel, personal injury, or death. See www.harken.com/
manuals for additional safety information.
Note: Install blocks so sheave is leaning away from mast.
“Harken”
will be towards mast. See drawing below.
1. Remove sheave.
Remove screw from port side of assembly. Pull
out centerpost from starboard side.
Tip:
Don’t worry about losing balls in sheave, they are captive. If
post is stuck, leave screw halfway in and push on screw head to
push post out port side.
2. Mark position of holes
. Keep “Harken” towards mast.
Flat in hole
retains post
Mast
Port Side: “Harken” must be towards mast.
Tip:
To make sure block is aligned with load, drill forward hole, insert
screw and sheave, run line to deck block and let block center itself.
Remove and drill other hole(s).
3. Mount carrier.
Drill holes and screw to deck using sealant, backing
plates, and locknuts.
1988, 1990
–
Do not overtighten screws; sheave
will bind.
Tip: Slightly bevel top of hole in deck to allow sealant to mass
near top of hole.
4. Installing sheave:
Slip post in from starboard side and seat end of shaft
in flat. Use blue Loctite
®
on screw threads and secure.
WARNING! You must mount to solid deck construction using speci-
fied fasteners in all mounting holes and nuts, washers or backing
plates to achieve correct maximum working load.
