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Crosby
SHUR-LOC® Hook Warnings, cont. |
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Page
209 |
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- Efficiency of
synthetic sling material may be reduced when used in eye or bowl of
hook.
- Always make
sure the hook supports the load. (See Figure 3).
- Do not use hook
tip for lifting (See Figure 4).
- When placing
two (2) sling legs in hook, make sure the angle from vertical to the
leg nearest the hook tip is not greater than 45 degrees, and the included
angle between the legs does not exceed 90 degrees* (See Figure 5).
- See ANSI/ASME
B30.10 "Hooks" for additional information.
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* For
two legged slings with angles greater than 90°, use an intermediate
link such as a master link or bolt type shackle to collect the legs of the
slings. The intermediate link can then be placed over the hook to provide
an in-line load on the hook. This approach must also be used when using
slings with three or more legs. |
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Figure
3 |
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Figure
4 |
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Figure
5 |
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Important
Basic Machining and Thread Information Read and Follow |
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- Wrong thread and/or
shank size can cause stripping and loss of load.
- The maximum diameter
is the largest diameter, after cleanup, than could be expected after
allowing for straightness, pits, etc.
- All threads must
be Class 2 or better.
- The minimum thread
length engaged in the nut should not be less than one (1) thread diameter.
- Hook shanks are
not intended to be swaged on wire rope or rod.
- Hook shanks are
not intended to be drilled and internally threaded.
- Crosby cannot
assume responsibility for, (A) the quality of machining, (B) the type
of application, or (C) the means of attachment to the power source or
load.
- Consult the Crosby
Hook Identification & Working Load Limit Chart (See below) for the
minimum thread size for assigned Working Load Limits. (WLL).†
- Remove from service
any Hook which has threads corroded more than 20% or the nut engaged
lenght.
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Crosby
Hook Identification & Working Load Limit Chart† |
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S-1316A
& S-1317A Only
Grade 100 Chain |
S-316A,
S-317A, S-318A, S-326A |
S-318A |
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Grade
80 Chain |
Wire
Rope XIP
Mechanical Splice |
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Chain
Size |
Working
Load Limit (lbs.)**
4:1 |
Chain
Size |
Working
Load
Limit
(lbs.)**
4:1 |
Wire
Rope
Size
(in.) |
Working
Load
Limit*
(lbs.)
5:1 |
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(in.) |
(mm) |
(in.) |
(mm) |
Maximum
Shank
Diameter
(in.) |
Minimum
Thread
Size |
— |
6 |
3200 |
— |
6 |
2500 |
5/16 |
2000 |
.72 |
1/2-13
UNC |
1/4 |
7 |
4300 |
1/4-5/16 |
7-8 |
4500 |
7/16 |
3800 |
.94 |
5/8-11
UNC |
5/16 |
8 |
5700 |
— |
— |
— |
— |
— |
— |
— |
3/8 |
10 |
8800 |
3/8 |
10 |
7100 |
1/2 |
5000 |
1.06 |
3/4-10
UNC |
1/2 |
13 |
15000 |
1/2 |
13 |
12000 |
5/8 |
7800 |
1.19 |
1"
- 8 UNC |
5/8 |
16 |
22600 |
5/8 |
16 |
18100 |
7/8 |
15200 |
1.38 |
1
1/4- 7 UNC |
* Ultimate Load is
5 times the Working Load Limit based on XIP Wire Rope.
** Ultimate Load is 4 times the Working Load Limit based on Grade 80 or
Grade 100 Chain.
† Working Load
Limit - The maximum mass or force which the product is authorized to support
in general service
when the pull is applied in-line, unless noted otherwise, with respect
to the centerline of the product. This term is
interchangeably with the following terms:
1.WLL, 2. Rated Load Value, 3. SWL, 4. Safe Working Load, 5. Resultant
Safe Working Load.
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Copyright
© 2003. The Crosby Group, Inc. All
Rights Reserved
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