DME Engineer Hoist Rings Operator's manual

DME Hoist Rings - Engineer the Lift
Engineer the lift!!
DME recommends the use of Center Pull Style swiveling and pivoting hoist rings, rather than
conventional eye bolts.
Are you using the proper hoist ring for the application?
Is the hoist ring free to swivel and pivot? Any movement restrictions?
Are lifting hole(s) in the proper location?
Do you have the correct hole size for the hardware – safe lift capacity?
Are the holes tapped deep enough to ensure full thread engagement? (See figure #3 on the
Installation Information page)
Recommended hole depth:
Steel – 1-1/2 times the bolt diameter (min.)
Aluminum – 2 times the bolt diameter (min.)
RULE OF THUMB, IF IN DOUBT – DON’T!!
Applied Load Changes With Sling Angle
DME swiveling hoist rings are designed and rated to be pulled at any angle at the rated load. However, the
applied load on a multipoint lift will increase if the sling angle is less than 90°. Be sure to consider the sling
angle when selecting lifting equipment. See illustration below.
DO’S
1. Observe working load limitations (be especially
careful with eyebolts used for angle lifts – see sling
angle chart).
2. Visually inspect hoist ring prior to use.
3. Fully tighten hoist ring to recommended torque. Full
thread engagement is required (no space between
swivel bushing and lift).
4. Assure proper thread depth – do not shim.
5. Make sure hoist rings have free travel – it must swivel
and pivot without restrictions.
6. When installing in soft material, such as Aluminum,
the minimum effective thread engagement should be
two times the diameter of the bolt (1-1/2 times bolt
diameter – steel).
DON’TS
1. Never pull a DME Center Pull Style hoist ring from
the side.
2. Never use an oversized hook in eyebolts or hoist
rings (see figure #1 on Installation Information
page).
3. Never use excessive sling angle.
4. Never steam clean or degrease hoist rings (could
cause rusting or binding).
5. Never apply shock loads.
6. Never allow the side of the hoist ring to make
contact with the lift (see figure #2 on the
Installation Information page).
7. DME hoist ring components are not
interchangeable with other manufacturers hoist
rings.
DME Company 29111 Stephenson Highway Madison Heights MI 48071
800-626-6653

DME HOIST RING
INSTALLATION INFORMATION
Select the proper Hoist Ring for the job. Do not attempt to apply
more then the rated load capacity. The load capacity is marked
on the hoist ring.
Drill and tap the workpiece so that the hoist ring bolt is installed
perpendicular to the surface of the workpiece. Countersink the
tapped hole to prevent “swelling” of the top thread when the
hoist ring bolt is torqued. The workpiece surface must be flat,
providing complete contact for the hoist ring bushing.
Do not use spacers between the hoist ring bushing and the
workpiece surface.
When installing in soft metal, such as aluminum, the minimum
effective thread engagement should be two times the diameter
of the bolt. When installing in steel, thread engagement should
be 1-1/2 times the bolt diameter.
Always tighten the bolt to the proper torque value, which is
stamped on the hoist ring.
Loosening of the bolt may develop during use. Re-tightening to the required torque must be done whenever
the bolt loosens. The proper tightening torque is stamped on the hoist ring.
When lifting, apply force gradually. DO NOT APPLY SHOCK LOADS.
For through-hole applications, be sure that nut/washer are the same quality grade as the hoist ring
Periodic visual inspection and pull testing is recommended as damage can occur from improper
usage.
DME Company 29111 Stephenson Highway Madison Heights MI 48071
800-626-6653