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Manuclave Anchor Clamp

User Instructions

Part Number

Material

Length

Width

Anchorage 

Opening

Connection 

Opening

Weight

Standard /

Regulation

251

Stainless Steel

16 in. (40.6cm)

6.8 in. (17cm)

4.4 in. (11cm)

1.4 in. (3.6cm)

12 lbs. (340g)

OSHA 1910.66,

OSHA 1926.502

252

Stainless Steel

16 in. (40.6cm)

8 in. (20.3cm)

5.5 in. (14cm)

1.4 in. (3.6cm)

13 oz. (369g)

OSHA 1910.66,

OSHA 1926.502

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 1-800-560-1094.

Purpose

The 3M Manuclave Anchor Clamps are designed to be used 
as part of a personal fall arrest system, to help limit the fall 
arrest forces in the event of a fall.

Use Instructions

1.  Failure to follow all instructions and limitations on the 

use of Manuclave Anchor Clamps may result in serious 
personal injury or death.

2.  Before using a personal fall arrest system, employees 

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

3.  Personal fall arrest systems, including Manuclave 

Anchor Clamps, shall be inspected prior to each use 
for wear, damage, and other deterioration. Defective 
components must be immediately removed from service, 
in accordance with the requirements of OSHA’s 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 Manuclave Anchor Clamps in a cool, dry, clean 

environment, out of direct sunlight, when not in use.

7.  After a fall occurs, the Manuclave Anchor Clamp must 

be removed from service and destroyed immediately.

Use Limitations

1.  Manuclave Anchor Clamps are designed for single users 

only.

2.  Per OSHA’s 29 CFR1910.66 and 1926.502 Manuclave 

Anchor Clamps must only be used on structures capable 
of supporting at least at least 5,000 pounds (22.2 kN) 
per employee attached, or shall be designed, installed, 
and used as part of a complete personal fall arrest system 
which maintains a safety factor of at least two, under the 
supervision of a qualifi ed person.

3.  Manuclave Anchor Clamps are designed to be used in 

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

4.  Do not expose Manuclave Anchor Clamps to chemicals 

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

5.  Caution must be taken when using Manuclave Anchor 

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

6.  Minors, pregnant women and anyone with a history 

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

7.  Do not use or install equipment without proper training 

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

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

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

Compatibility Limitations

All 3M Manuclave Anchor Clamps must only be coupled to 
compatible connectors.  OSHA’s 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 listed.  The following connections must be 
avoided, as they are conditions that 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.

Performance

All Manuclave Anchor Clamps meet a 5,000 lb. tensile load.

WARNING

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