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 TB 55-1900-201-45/1
*Long Ton (2240 lbs)
**Indicates safety factor. For working loads between 10 and 13 tons, intermediate values of the safety factors may be
used.
2-36. Loose Gear Tests.
a. The evidence of tests and the recording thereof is required for all chains, rings, hooks, links, shackles, blocks
and any other loose gear whether accessory to a machine or not. All loose gear shall have a mark or number by which
each piece can be identified and will be listed on a loose gear certificate. The safe working load "SWL" shall be marked
on all blocks.
Table 2-3. Proof Loads for Articles of Gear
Articles of Gear
Proof Load
Chains, rings, hooks, links, shackles, swivels
Twice the safe working load.
Single sheave block
Four times the safe working load.
Multiple sheave block with safe working load up to and in-
Twice the safe working load.
cluding 20 tons
Multiple sheave block with safe working load over 20 tons
20 tons in excess of the safe working load.
up to & including 40 T
Multiple sheave block over 40 Tons
1-1/2 times the safe working load.
DO
Roller chains (pitched chains) used with hand operated
chain falls, rings, hooks, shackles or swivels permanently
attached thereto.
DO
Chain fall blocks used with roller chains(pitched chains),
rings, hooks, shackles or swivels permanently attached
thereto.
NOTE
The proof load applied to the block is equivalent to twice the maximum resultant load on
the eye or pin when lifting the safe working load attached to a rope which passes around
the sheave of the block. The proof load is, therefore, equal to four times the safe work-
ing load or twice the safe working load when the load is attached directly to the block in-
stead of a rope passing around the sheave.
2-22
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