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

4.2  Surface of provisions.

The material edges shall be rounded (minimum of 1/8" radius to round cross- section) or chamfered (minimum of 1/16" x 1/16"), and smoothed to prevent cutting or damage to the lifting or tiedown chains.

4.3 Shackles.

Shackles shall not be used as lifting, equipment tiedown or multipurpose provisions unless they meet the requirements of an alloy, safety (bolt-pin) anchor shackle in RR-C-

271D, and the nut is secured by tack welding.  If the Working Load Limit (WLL) of the shackle is higher than what is required by RR-C-271D, then the shackle may be labeled with the higher WLL.  The resulting provision shall meet all requirements of this standard.

4.4 Hub and axle attachments.

Wheel hubs and axles shall not be used as lifting or equipment tiedown provisions.

4.5  Removable provisions.

Provisions that can be removed are prohibited.  A tiedown or lifting provision that doubles as another device, such as a towing provision, shall not be used if the secondary function requires removal of the provision.  Figure 2 shows an example of an acceptable dual purpose provision that does not require removal of the provision.  For cargo tiedown provisions that have bolts and nuts as their primary components, the nuts must be welded onto the bolts to prevent them from being disassembled by hand, with simple tools, or from vibrating loose during their life cycle.

4.6  Freezing and jamming.

All lifting, tiedown, and cargo tiedown provisions shall be designed to prevent the movable parts from freezing in place during cold weather or from jamming because of accumulations of mud, paint, rust and/or infrequent use. If drain holes are used in the provisions, they shall meet the requirements of CFR Title 49 for ammunition shipments.

4.7  Stowable lifting provisions.

"Hideaway" provisions, which are nonremovable parts of the equipment and can be stowed out of the way, are acceptable where other types of lifting eyes would interfere with loading and unloading of cargo, or to prevent sling interference during lifting. Stowed provisions shall meet all provision design requirements in this standard.  If stowed provisions are covered, the cover shall be removed and provision unstowed without tools.  Allowances must be made to stow the cover when the provisions are in use.  The contractor shall provide instructions for the servicing of the retracting

mechanism for stowable provisions.  If a provision loses some of it's strength capacity in its stowed position, it shall be made inaccessible so that it cannot be misused.  If tools

or locking pins are used to employ the stowed provisions, a suitable means must be provided to prevent the loss of these tools or pins.

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