ASC manufactures the very best in the industry. We look closely at the best the completion has to offer and we know what we bring you is not only the best quality slings but the best support and service as well. Superb workmanship, branded leather tags, and the best warning tags are what make ASC slings the choice of riggers everywhere in all industries.

Our in-house inventory helps you get the job done inrush and emergency situations. If we don’t have the sling you need, ASC can usually send most special orders within the day. Synthetic web slings offer a number of advantages for rigging purposes. The most commonly used synthetic web slings are made of nylon- or polyester-type yarns. They have the following properties in common:

  • Strength,
  • Convenience,
  • Load protection, and
  • Economy.

Each synthetic material has its own unique properties.

Certain synthetic materials perform better than others in specific applications and environments. Consult ASC customer service or sales personnel for a specific application or before using in and around chemical and special environments.

Synthetic webbing materials other than nylon and polyester are also used and the ASC staff should be consulted for specific data and for proper use.


New slings are marked by ASC to show:

  • The rated load for each type of hitch, and
  • The type of synthetic web material.

Rated loads:

Rated loads (capacities) for single-leg vertical, choker, basket hitches, and two-leg bridle slings are available in our product specification section.

For angles not shown, use the next lower angle or a qualified person to calculate the rated load. Rated loads are based on:

  • Material strength,
  • Design factor,
  • Type of hitch,
  • s
  • Diameter of curvature over which the sling is used, and
  • Fabrication efficiency.


Ensure that mechanical fittings used as part of a synthetic web sling meet the following:

  • Materials are compatible with the mechanical and environmental requirements of the sling,
  • Fittings have a rated load at least the same as the synthetic webbing sling,
  • Fittings have sufficient strength to sustain twice the rated load of the sling without visible permanent deformation, and
  • Surfaces are clean, and sharp edges are removed.


Designate a qualified person to inspect slings each day before use for damage or defects.

This qualified person also performs additional periodic inspections where service conditions warrant, as determined on the basis of:

  • Frequency of sling use,
  • Severity of service conditions,
  • Nature of lifts being made, and
  • Experience gained during the service life of slings used in similar circumstances.

Make periodic inspections of synthetic web slings at intervals no greater than 12 months. A good guide to follow includes:

  • Yearly for normal service use,
  • Monthly to quarterly for severe service use, and
  • As recommended by a qualified person for special and infrequent service use.

ASME standard contains provisions on inspection records.
Make a thorough inspection of slings and attachments. Items to look for include:

  • Missing or illegible sling identification,
  • Acid or caustic burns,
  • Melting or charring of any part of the sling,
  • Holes, tears, cuts, or snags,
  • Broken or worn stitching in load bearing splices,
  • Excessive abrasive wear,
  • Knots in any part of the sling,
  • Discoloration and brittle or stiff areas on any part of the sling,
  • Pitted, corroded, cracked, bent, twisted, gouged, or broken fittings, and
  • Other conditions that cause doubt as to continued use of a sling.

Where any such damage or deterioration is present, remove the sling or attachment from service immediately.

Chapter 5.0
Recommended Operating Practices


Section 5.1 Purpose

5.1.1The purpose of this chapter is to provide guidelines of webbing sling preparation, inspection and use.

Section 5.2 Mechanical Considerations

5.2.1Determine weight of the load. The weight of the load shall be within the rated capacity of the sling.
5.2.2Select sling having suitable characteristics for the type of load, hitch and environment.
5.2.3Slings shall not be loaded in excess of the rated capacity. Consideration should be given to the angle of lift, (sling to load angle) which affects rated capacity.
5.2.4Slings with fittings which are used in a chocker hitch shall be of sufficient length to assure that the choking action is on the webbing, and never on the other fitting.
5.2.5Slings used in a basket hitch shall have the load balanced to prevent slippage.
5.2.6The opening in fittings shall be the proper shape and size to insure that the fitting will seat properly in the hook or other attachments.
5.2.7Slings shall be protected from contact with edges, protrusions or abrasive surfaces.
5.2.8Slings shall not be dragged on the floor or over an abrasive surfaces.
5.2.9Slings shall not be pulled from under loads when the load is resting on the sling.
5.2.10Slings shall not be pulled from under loads when the load is resting on the sling.
5.2.11Do not drop slings equipped with metal fittings.
5.2.12Slings that appear to be damaged shall not be used unless inspected and accepted as usable under Section 5.2.
5.2.13The sling shall be hitched in a manner providing control of the load.
5.2.14Portions of the human body should be kept from between the sling and the load, and from between the sling and the crane hook or hoist hook.
5.2.15Personnel should stand clear of the suspended load.
5.2.16Personnel shall not ride the sling.
5.2.17Shock loading should be avoided.
5.2.18Twisting the legs (branches) shall be avoided.
5.2.19Load applied to the hook should be centered in the base (bowl) of hook to prevent point loading on the hook.
5.2.20During lifting, with or without the load, personnel shall be alert for possible snagging.
5.2.21The slings’ legs (branches) should contain or support the load from the sides above the center of gravity when using a basket hitch.
5.2.22Slings shall be long enough so that the rated load (rated capacity) is adequate when the angle of the legs (branches) is taken into