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General Safety Information

These 

User Instructions

 are not to be removed except by the 

user of this equipment.  

User Instructions

 must always be 

available to the user.  

Compliant fall protection and emergency rescue systems 
help prevent serious injury during fall arrest.  Users must 
read and understand the 

User Instructions

 provided with the 

product and be properly trained by their employer prior to 
use per OSHA 29 CFR 1910.66 and 1926.503 or applicable 
local standards.  

Misuse or failure to follow warnings and 

instructions may result in serious personal injury or 
death.

  For proper use, see supervisor, 

User Instructions

, or 

call Technical Service at 800-243-4630.

Purpose

The 3M Bosun Chair is a single-point adjustable suspension 
scaffold designed to support one user in a seated position.

Use Instructions

1.  Failure to follow all instructions and limitations on the 

use of Bosun Chairs may result in serious personal injury 
or death.

2.  Before using a personal fall arrest system, employees 

must be trained in accordance with the requirements of 
OSHA 29 CFR 1910.66 in the safe use of the system and 
its components.

3.  Personal fall arrest systems, including those used with 

Bosun Chairs, must be inspected prior to each use for 
wear, damage, and other deterioration and defective 
components must be immediately removed from service, 
in accordance with the requirements of OSHA 29 CFR 
1910.66 and 1926.502.

4.  The complete fall protection system must be planned 

(including all components, calculating fall clearance, and 
swing fall) before using.

5.  Users must have a rescue plan, and the means at 

hand to implement it, that provides the prompt rescue 
of employees in the event of a fall or assures that 
employees are able to rescue themselves.

6.  Store Bosun Chairs in a cool, dry, clean environment, out 

of direct sunlight, when not in use.

Use Limitations

1.  Bosun Chairs are designed for single users (including 

clothing, tools, ect.) with a capacity up to 400 pounds.  

2.  Users of Bosun Chairs must be protected by a separate 

personal fall arrest system.

3.  Do not use Bosun Chairs when a heat-producing process 

such as gas or arc welding is being conducted.

4.  Bosun Chairs are designed to be used in temperatures 

ranging from -40ºF to +130ºF (-40°C to +54°C).

5.  Do not expose Bosun Chairs to chemicals or harsh 

solutions which may have a harmful effect.  Contact 3M 
Technical Service with any questions. 

6.  Caution must be taken when using Bosun Chairs near 

moving machinery, electrical hazards, sharp edges, 
or abrasive surfaces, as contact may cause equipment 
failure, personal injury, or death.

7.  Minors, pregnant women and anyone with a history 

of either back or neck problems should not use this 
equipment.

8.  Do not use or install equipment without proper training 

from a “competent person” as defi ned by OSHA 29 CFR 
1926.32(f).

9.  Only 3M, or persons or entities authorized in writing by 

3M, shall make repairs or alterations to the equipment.

Compatibility Limitations

Bosun Chairs must only be coupled to compatible 
connectors.  OSHA 29 CFR 1926.502 prohibits snaphooks 
from being engaged to certain objects unless two 
requirements are met: it must be a locking type snaphook, 
and it must be “designed for” making such a connection.  
“Designed for” means that the manufacturer of the snaphook 
specifi cally designed the snaphook to be used to connect 
to the equipment in question.  The following connections 
must be avoided, because they can result in rollout* when a 
nonlocking snaphook is used:

• 

Direct connection of a snaphook to horizontal lifeline.

• 

Two (or more) snaphooks connected to one D-ring.

• 

Two snaphooks connected to each other.

• 

A snaphook connected back on its integral lanyard.

• 

A snaphook connected to a webbing loop or webbing 
lanyard.

• 

Improper dimensions of the D-ring, rebar, or other 
connection point in relation to the snaphook dimensions 
that would allow the snaphook keeper to be depressed by 
a turning motion of the snaphook.

*

Rollout

: A process by which a snaphook or carabiner 

unintentionally disengages from another connector or object 
to which it is coupled. (ANSI Z359.1-2007)

Part Number

Material

Length

Width

Height

Thickness

Connection Size

Weight

4670

Birch Plywood

23-3/4 in. (603mm)

11-3/4 in. (298mm)

25 in. (635mm)

3/4 in. (19mm)

3 in. (77mm)

6 lbs. (2.7kg)

WARNING

Bosun Chair

User Instructions

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