CM Herc-Alloy 800 Chain System: Care, Use, and Inspection

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Grade 80 CM Herc-Alloy 800 chain slings and attachments are manufactured from special analysis alloy steel, engineered for a superior combination of strength, lightness and durability. These qualities give the Herc-Alloy 800 system higher working load limits and longer life than conventional alloy chain products and make it easier to handle.

All Herc-Alloy 800 chain and attachments are black finish and/or color coded orange for easy, permanent identification. The chain is embossed approximately every 10 inches with the make (CM) and grade (HA-800) appearing alternately.

Before shipment, all CM Herc-Alloy 800 chain slings undergo a succession of demanding quality control checks. Every sling is proof tested, registered and guaranteed for one year to be free from defects in materials and workmanship. A durable metal tag attached to the sling permanently identifies the grade, type, working load limit (at a specific angle of lift) and registration number of the sling.


How to select and order the proper chain sling.

Herc-Alloy 800 Chain System—Care, Use & Inspection Diagram

  • Determine the weight and configuration of the load(s) to be lifted.
  • Determine the type of chain sling required according to the weight and configuration.

In describing the type, the following symbols should be used. If attachments are other than standard, give detailed specifications.First Symbol (Basic type)
S –  Single chain sling
C –  Single Choker chain sling with a standard end link on each end, no hooks
D –  Double branch chain sling
T –  Triple branch chain sling
Q –  Quadruple branch chain slingSecond Symbol (Type of master link or end link)
O –  Oblong master link of standard dimensions
P –  Pear-shaped master link (available on request, not a standard item)

Third Symbol (Type of hook)
S  –  Sling hook
F –  Foundry hook
G –  Grab hook
L –  Latchlok

  • Determining the size of the body chain according to the working load limits*. Be sure to take into consideration the effect of the required angle.

Working load Limit: The “working load limit” is the maximum load in pounds, which should never be applied to chain, even when the chain is new, and when load is uniformly applied in direct tension to a straight length of chain.

  • Determine the reach required to give the desired angle. The reach is measured from the upper bearing surface of the master link to the bearing surface of the lower attachment. If chain slings are to be used in pairs and are to be matched for reach, please indicate when ordering.
  • Be sure to specify type, size and reach when ordering chain slings. For specifications on additional hooks, attachments and accessories, contact your local Lifting Specialist.


Use of chain under extreme temperature conditions.

When the chain itself is subjected to temperatures shown below, working load limits should be reduced as indicated.

CM Temperature Chart Herc-Alloy

(1) While chain is at temperature shown in first column.
(2) When chain is used at room temperature after having been subjected to temperatures shown in first column.


Herc-Alloy 800 Chain System—Care, Use & Inspection Specs 2

All alloy chain and components meet or exceed the National Association of Chain Manufacturers welded chain specifications.


The life and strength of CM Herc Alloy 800 Chain Slings depend on proper use, maintenance and inspection. Read this information carefully and also refer to ASME B30.9 and OSHA regulations for additional information.



Observing the following precautions when using chain slings will help protect both operators and materials.

  1. Inspect chain slings before use as indicated in inspection section.
  2. Do not exceed working load limit as indicated on sling identification tag. Any of the following factors can lower the load the chain will hold.
    – Rapid load application can produce dangerous overloading.
    – Variation in the angle of the load to the sling. As the angle decreases, the working load of the sling will decrease. Refer to working load limit chart.
    – Twisting, knotting and kinking subjects links to undesirable loading, which decreases the working load limit of the sling.
    – Conditions other than that for which slings are intended can reduce the working load limit of the sling. For example, use at elevated temperatures will result in a reduction in working load limit (refer to temperature chart on the previous page).
  3. Free all twists, knots and kinks.
  4. Center load in hook(s). Hook latches must not support load.
  5. Avoid sudden jerks when lifting and lowering.
  6. Balance all loads, avoid tipping of loads.
  7. Use pads around corners.
  8. Don’t drop load on chains.
  9. Select attachments, such as hooks or rings, for use with chain to match the size and working load limit of the chain.
  10. Use only CM alloy chain and attachments (Grade 80) for overhead lifting. The identification tag is found on the master coupling link of each chain sling and contains the following information: Grade, Type, Size, Working Load Limit (at a specific angle), Reach and Serial Number.



Chain Slings require proper care as follows:

  1. Store slings on an ‘A’ Frame in a clean dry place.
  2. Avoid corrosion. Oil chains before prolonged storage.
  3. Never alter the thermal treatment of Herc-Alloy 800 chain by heating.
  4. Do not plate or change surface finish of sling. Contact your local Lifting Specialist for special requirements.



It is important to inspect chain slings regularly and to keep a record of each chain inspection. The following is a guide for such an inspection procedure. We can supply sling record cards or sheets as requested.

Before inspecting, clean the chain sling so that marks, nicks, wear and other conditions can be seen. Use a non-acid / non-caustic solvent. Each chain link and sling component should be individually inspected for the following conditions.

  1. Twists or bends
  2. Nicks or gouges
  3. Excessive wear at bearing points. Refer to wear allowance chart.
  4. Stretch
  5. Distorted, worn or damaged master links, coupling links, or attachments, especially spread in throat opening of hooks. Each link or component having any condition listed above is to be marked with paint to plainly indicate rejection and eliminated from service until properly repaired.

Note: We assume no responsibility for the misuse or misapplication of any of its products. Products are provided with the express understanding that the purchaser and/or user are thoroughly familiar with the correct application and proper use. Warnings and definitions are provided as an aid to the user in understanding correct application and proper use.

Working load limit—refers to the maximum load (rated capacity) in pounds that shall be applied to the chain sling. Refer to working load limit chart. The manufacturer does not accept any liability for damages which result from the sling being used in excess of the working load limit or from abuse.


Wear Allowance (Herc-Alloy 800 Chain)

Determine wear by measuring cross section at link ends. If worn to less than the minimum thickness allowable, chain should be removed from service.

Herc-Alloy 800 Chain System—Care, Use & Inspection Specs 3

We offer a wide range of informative materials and instructive programs on chain and chain inspection.

Educational programs are designed to promote the proper use of all chain products and assist users in complying with OSHA with regulations.


All product warnings: Warnings Page
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