INSTRUCTIONS
One Ton
Twing
Block, 3405
WARNING! 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.
USA
–
Tel:
(+01) 262-691-3320 •
Web:
www.harken.com •
Email:
Italy
–
Tel:
(+39) 031 3523511 •
Web:
www.harken.it •
Email:
Features
Side opening sideplate
- Easy to rig and remove from sheet
Spring loaded button release
- Quick one-handed rigging
Anti-capsize bar
- Keeps sheave aligned on sheet
ULC main bearing
- Sheave turns smoothly under extreme loading
Sideload balls
- Carry loads especially when block not aligned in light air
Thimble at pivot base
- Use 1:1 or 2:1 up-down control
Machined aluminum inner sideplates
- High strength, low weight
Soft polyurethane outer sideplate bumpers
- Protects block and deck
Terms
Uses
• Twing, tweeker control for code zero sheets
• Can be used as snatch block when combined with soft shackle
• Spinnaker sheet and guy control
Specifications
Part
No.
Description
Sheet max
line Ø
Up/down max
line Ø
Weight
G - Maximum
working load
Breaking
load
in
mm
in
mm
oz
g
lb
kg
lb
kg
3405
1 Ton Twing Block
.43
11
.34
9
1.4
143 2205 1000 4409 2000
Release button
Thimble for
rigging 2:1
Main sheave
Anti-capsize bar
Open position
Sideload balls
Aluminum inner
sideplate
Polyurethane
outer sideplates
Adjusting nut
Closed position
1