MIL-STD-209 Lifting And Tiedown ProvisionsThis standard establishes dimensional limits, design considerations, positioning requirements, and strength requirements for lifting to include helicopter sling load HSL and tiedown provisions for lifting or tying down tanks and other tracked vehicles, tactical wheeled vehicles, helicopters, and other military equipment shipped assembled or disassembled in unboxed or uncrated condition, and for restraining cargo or accessories to such equipment. The lifting and tiedown requirements in this standard are necessary to permit compatibility between military equipment and the transportation systems used for deployments.

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MIL-STD-209K

Note: This option applies for equipment with a GW of 50,000 pounds or more

Figure 8. Example of an Equipment Tiedown Provision with Two Openings.

Resulting cross-section

Figure 9. Example of resulting cross-section that must be inscribed in a 2 inch diameter circle

Source: https://assist.dla.mil -- D3o3wnloaded: 2014-09-28T23:10Z Check the source to verify that this is the current version before use.