I think if a 3rd party Safety Officer were to look at the way it has been
installed some of your company managers heads would roll.
Placing the nut in that position allows the stud section to see a greater
stress due to lever action.
An eye bolt should be tightened down to ITS flange.
I should have known some high road traveling fuckwit was going to come
along and point out the blindingly obvious.
However, in an ideal world you would indeed be correct. Unfortunately
nobody works in that non-existent ideal world.
The nut is there to add rigidity when used in handling holes to shallow
for the full length of the thread. Although not the best condition, a
shoulder via a nut is far better than no shoulder at all. The nut wasn't
put there to "repair" any cracks.
Nut or no nut, my point is don't take your eye bolts for granted, they
should be inspected with every use.
Black Dragon wrote in news:ggsf7l$kvj$ email@example.com:
There is no stress-relieving fillet at the area of maximum stress when a
nut is used on a thread like that. This is why it broke where it did. It
is _much_ safer to shorten the threads on the eye bolt than to weld a nut
on it and move the stress concentrations to the middle of a thread root.
The result is what you see in the pictures. The nut being welded on in
that manner is asking for a very heavy object to fall from some height
when the bolt snaps off.
I'll agree _ANY_ lifting equipment should be inspected before and after
a.. The receiving hole should be counter-sunk and be free and clear of any
debris to assure proper seating
b.. LOADS SHOULD ALWAYS BE ALIGNED TO THE PLANE OF THE EYE, not at an
angle to the plane. A steel washer or spacer may be used in conjunction with
Shoulder Eye bolts to attain proper load alignment. The thickness of the
steel washer or spacer must not exceed one thread pitch.
c.. Angular lifting should be avoided. Angular lifts significantly reduce
rated capacities. See Eye bolt Rated Capacities/Guidelines
d.. Check seating after applying an angular lift since the initial lift
may cause the bolt to back away from the load. If such occurs, it should be
unloaded & properly reseated.
e.. For applications with untapped through-holes, longer length Shoulder
Eye bolts are recommended, using a steel washer and a nut for the required
thread length of engagement.
f.. Shoulder bolt tapped holes are to have a threaded length which allows
for full length of shank engagement and clearance for the unthreaded portion
g.. Shoulder bolts must be firmly seated and flush against the mating
surface; otherwise, the rated capacity is reduced significantly. The use of
a steel washer is permissible and may be required; however, the thickness
must not exceed one thread pitch.
h.. Plain Eye bolt tapped holes are to be threaded for full length
engagement of the Eye bolt.
i.. Plain bolts must have full thread shank engagement, allowing for
one-half turn for proper eye-alignment to obtain rated capacities.
a.. Eye bolts should be inspected and installed by a competent person who
is knowledgeable about the application and installation.
b.. Each bolt must be completely inspected BEFORE each use for possible
defects such as: distortion, bent shank/threads, or incomplete/incorrectly
formed threads. Periodic inspection of bolts is highly recommended.
c.. Eye bolts should not be painted or otherwise coated when used for
lifting; such coatings make it difficult to inspect for defects or wear
d.. Bolts should not be left where they can incur mechanical damage or
e.. Destroy bolts when signs of bend, elongation, wear or damage are
visible. Such signs indicate that the bolt has been stressed (overloaded)
beyond rated capacity. Never attempt to repair a stressed bolt.
f.. Destroy bolts when they show signs of alteration. Signs include:
gouging, undercutting, welding, etc.
g.. Proper Destruction of an Eye bolt: crushing or cutting clear across
the eye of the bolt.
a.. DO NOT work, stand or crawl around the load of the Eye bolt. Ensure a
safe distance from the load.
b.. DO NOT use wrenches, crowbars, etc. to tightening Eye bolts. Hand
tighten is recommended.
c.. DO NOT use a single eye bolt to lift a load that can rotate. Safety
Swivel Hoist Rings are recommended for such loads.
d.. DO NOT force hooks or any other fittings into the eye;they must fit
e.. DO NOT exceed the rated capacity.
f.. DO NOT SHOCK LOAD BOLTS. Gradually increase lifting of the load to
g.. DO NOT weld bolts, or perform any weld-repair on the bolts.
h.. DO NOT machine Eye bolts on the shank or shoulder to achieve proper
i.. Do NOT expose bolts to extreme environmental conditions, as they may
adversely affect the rated capacity.
Rated Capacity Guidelines
a.. The minimum threaded shank length of an Eye bolt must be one thread
diameter to attain the rated capacity.
b.. No greater load should be applied to a bolt than the rated capacity
c.. Angular lifts significantly reduce Shoulder Bolt Rated Capacities.
Shoulder bolts should not be used for angular lifts greater than 45°; Safety
Swivel Hoist Rings are recommended for such applications.
d.. Plain Eye bolts are not recommended for angular load applications.
Safety Swivel Hoist Rings are recommended for such applications.
1/4 500 125 Safety swivel hoist rings recommended
5/16 900 225 Safety swivel hoist rings recommended
3/8 1,300 325 Safety swivel hoist rings recommended
7/16 1,800 450 Safety swivel hoist rings recommended
1/2 2,400 600 Safety swivel hoist rings recommended
9/16 3,000 800 Safety swivel hoist rings recommended
5/8 4,000 1,000 Safety swivel hoist rings recommended
3/4 5,000 1,250 Safety swivel hoist rings recommended
7/8 7,000 1,750 Safety swivel hoist rings recommended
1 9,000 2,250 Safety swivel hoist rings recommended
1 1/8 12,000 3,000 Safety swivel hoist rings recommended
1 1/4 15,000 3,750 Safety swivel hoist rings recommended
1 1/2 21,000 5,250 Safety swivel hoist rings recommended
1 3/4 28,000 7,000 Safety swivel hoist rings recommended
2 38,000 9,500 Safety swivel hoist rings recommended
2 1/2 56,000 14,000 Safety swivel hoist rings recommended
Note: Plain Eyebolt angular rated capacities are significantly lower than
Shoulder Eyebolt rated capacities; therefore, angular lifting is not