TM 55-2200-001-12
Change 3
Section No. 1--General Rules (Rev.-9-1984)
4.2
Bent, twisted, stretched or collapsed links.
4.3
Links weakened by gouges or pits.
4.4
Chain repaired or joined with other than repair links of a type as illustrated. (Fig. 1)
4.5
Links obviously worn or showing other visible evidence of loss of strength.
4.6
Knots or twists in any portion of the chain.
4.7
Spread or distorted grabhooks.
4.8
An anchor point used in the securement of the load which is in a weakened condition or shows evidence of
loss of strength because of cracks, breaks, distortion or other deterioration.
5.
Binders and Procedure for Testing:
5.1
Binders are to be marked with the rated capacity which is equal to their ultimate breaking strength.
When binders are listed under paragraph 5.6, they will be identified as to size of chain with which they are to be used.
The Committee will take into consideration the working load limit of the chain as related to the maximum breaking
strength of the binder to identify the binder size and the type of chain with which the binder is to be used. Generally, the
working strength of the chain should be equal to Y of the rated capacity of the binder,
5.2
Binder manufacturers are requested to contact the Director, Rules and Inspection, concerning the testing of
their products for approval for use on open top loading.
5.3
Upon request by a binder manufacturer, the Director, Rules and Inspection, will designate a member of the
Open Top Loading Rules Committee to call upon the manufacturers and randomly select three binders of each model the
manufacturer desires tested. Binders will be appropriately identified and forwarded to the AAR Research Center for
testing at the manufacturer's expense.
5.4
Binders are expected to fail at a point equal to or greater than their capacity as marked on the binder.
5.5
Failure of one of the three binders does not exclude the product from further consideration, provided
analysis of the test does not reveal significant defects. An additional three binders may be selected and tested.
Successful performance of the three binders qualifies the binders for inclusion in a list of acceptable binders.
5.6
List of Acceptable Binders
Type of Chain
3/8 HT
3/8 Alloy
1/2 HT
1/2 Alloy
Binder MFG. & MODEL
ACCO Industries, Inc. Model BX 300
X
ACCO Industries, Inc. Model BXR 310
X
ACCO Industries, Inc. Model BX 400
X
ACCO Industries, Inc. Model BX 600
X
Midland Forge Model 105
X
Midland Forge Model 105-C
X
Midland Forge Model 106
X
Campbell Chain Model C7R
X
Campbell Chain Model C7L
X
Durbin-Durco Model DD-7-1
X
5.7
Binders will be considered acceptable for use with Alloy Steel Chain provided they demonstrate a breaking
force for size and grade not less than the following table:
DEMONSTRATED BREAKING
SIZE
GRADE
FORCE-POUNDS
3/8
43
16,200
3/8
70
26,400
3/8
80
25,600
1/2
43
27,600
1/2
70
45,200
1/2
80
45,600
a.
To determine the acceptability of binders not listed above, the ratio between the demonstrated breaking force
and the chain working load limit must be 3.0 for Grade 43 Alloy Chain; 4.0 for Grade 70 Alloy Chain; and 3.5 for Grade
80 Alloy Chain.
D-26
