Purchase Systems

Part No. 
IN105 – 6:1 purchase system
443.2624 – 4:1 purchase system (Contact Harken UK)


Harken purchase systems increase operation strength, providing low-friction pulling power in a wide variety of pulling/lifting operations. Systems can be used on their own, or easily combined with an existing system for tensioning, deviation, or casualty transfer. Purchase systems come fully rigged with tamper-evident termination.

Simple to use in load-assist applications
Harken purchase systems are used by emergency services and rescue personnel to help transfer loads and individuals from working ropes to alternates. The systems are also used to transfer loads in deviation, and to take the load when lifting inanimate objects.

Maintenance is easy
To clean, simply flush pulleys with fresh water. As with all equipment, check regularly to make sure it is in good working order. Check rope for chafe and wear. Make sure tamper-evident seals are intact.

LA low friction sheave

Low-friction sheave
Delrin® ball bearings provide low-friction, easy rope release under load. Ball bearings are UV-stabilized for maximum protection.

LA ball bearing cam cleats

Ball bearing cam cleats
Harken ball bearing cam cleats hold rope securely and release easily under load. Multiple rows of ball bearings reduce friction. The cam’s V-shape guides rope for easy entry.

LA fairlead

Tamper evident
Purchase systems are supplied prereeved and fully assembled. The securing knot is sealed to prevent irreparable damage to the system.


CE certification
CE certified under EN 13157 (Machinery Directive). IN105 has a maximum rated load of 1.47 kN; IN2624 has a maximum rated load of 1.98 kN.

Delrin is a registered trademark of E.I duPont de Nemours and Company or its affiliates.


Max Working Load

6:1 System = 150 kg (300.7 lb), 4:1 System = 202 kg (445 ib)

Breaking load

6:1 System = 600 kg (1322.8 lb), 4:1 System = 1020 kg (2248.7 Ib)

Part no.

6:1 System = 443.231, 4:1 System = 443.2624

Q: What makes Harken purchase systems different from others?
A: Harken purchase systems are CE certified under EN 13157 (Machinery Directive).

Q: Are Harken purchase systems suitable for human suspension?
A: Yes. However, systems must be used in conjunction with fall protection when used for human suspension.

Q: Can I replace the rope or parts within the system?
A: No. Modifications cannot be made to Harken purchase systems without losing certification. This includes re-reeving the rope.

Q: What is the range of travel of our purchase systems?
A: The designed travel range for the 6:1 is 1.2 meters (4′) and the 4:1 is 2 m (6.5′). Other lengths can be made to measure. Please contact the Harken Industrial team.

Q: What purchases are offered?
A: Harken offers purchase systems with 4:1 (Contact UK Tech Service) or 6:1 mechanical advantages (offered in U.S. and UK). They are both CE certified under EN 13157. Different configurations are available. Please contact the Harken technical team.

Q: Does the system come with attachments or accessories?
A: The 4:1 system is supplied with shackles for attaching karabiners, ropes, or other connectors. The 6:1 system is available with or without shackles.

Maximum rated load for lifting & pulling load applications
1.47 kN (coefficient ratio of 4:1 of breaking load); marked in accordance with the Machinery Directive and EN13157.2004 standard.

Warnings and Instructions
You must carefully read, understand, and follow all of the warnings and instructions in the manual provided by Harken in order to avoid an accident. Never, under any circumstances, exceed the maximum rated load.