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Crosby® Hook Warnings


  • Loads may disengage from hook if proper procedures are not followed.
  • A falling load may cause serious injury or death.
  • See OSHA Rule 1926.550(g) for personnel hoisting by cranes and derricks and OSHA Directive CPL 2-1.29 – Interim Inspection Procedures During Communication Tower Construction Activities. Crosby 319, 320 or 322 hooks with a PL latch attached and secured with a bolt, nut and cotter pin (or toggle pin) may be used for lifting personnel. Crosby 319N, 320N or 322N hooks with an S-4320 latch attached and secured with cotter pin or bolt, nut and pin; or a PL-N latch attached and secured with toggle pin may be used for lifting personnel. A hook with a Crosby SS-4055 latch attached shall NOT be used for personnel lifting.
  • See OSHA Directive CPL 2-1.29 - Crosby does not
    recommend the placement of lanyards directly into the positive locking Crosby hook when hoisting personnel. Crosby requires that all suspension systems (vertical lifelines / lanyard) shall be gathered at the positive locked load hook by use of a masterlink or a bolt-type shackle secured with cotter pin.
  • Threads may corrode and/or strip and drop the load.
  • Remove securement nut to inspect or to replace S-322, S-3316 and S-3319 bearing washers (2 each).
  • Hook must always support the load.
    The load must never be supported by the latch.
  • Never apply more force than the hook’s assigned
    Work Load Limit (WLL) rating.
  • Read and understand these instructions before using hook.

QUIC-CHECK® Hoist hooks incorporate markings
forged into the product which address two (2) QUIC-CHECK® features:

Deformation Indicators: Two strategically placed marks, one just below the shank or eye and the other on the hook tip, which allows for a QUIC-CHECK® measurement to determine if the throat opening has changed, thus indicating abuse or overload.

To check, use a measuring device (i.e., tape measure) to measure the distance between the marks. The marks should align to either an inch or half-inch increment on the measuring device. If the measurement does not meet criteria, the hook should be inspected further for possible damage.

Angle Indicators: Indicates the maximum included angle which is allowed between two (2) sling legs in the hook. These indicators also provide the opportunity to approximate other included angles between two sling legs.

  • A visual periodic inspection for cracks, nicks, wear, gouges and deformation as part of a comprehensive documented inspection program, should be conducted by trained personnel in compliance with the schedule in ASME B30.10.
  • For hooks used in frequent load cycles or pulsating loads, the hook and threads should be periodically inspected by Magnetic Particle or Dye Penetrant.
    (Note: Some disassembly may be required).
  • Never use a hook whose tip has been bent, resulting in throat opening of more than 5%, not to exceed 1/4 in., or is in any other way distorted or bent. Note: A latch will not work properly on a hook with a bent or worn tip.
  • Never use a hook that is worn beyond the limits shown in Figure 1.
  • Remove from service any hook with a crack, nick or gouge. Hooks with a nick or gouge shall be repaired by grinding lengthwise, following the contour of the hook, provided that the reduced dimension is within the limits shown in Figure 1. Contact Crosby Engineering to evaluate any crack.
  • Never repair, alter, rework or reshape a hook by welding, heating, burning or bending.
  • Never side load, back load or tip load a hook. (Side loading, back loading and tip loading are conditions that damage and reduce the capacity of the hook, See Figure 2).
  • Eye hooks, shank hooks and swivel hooks are designed to be used with wire rope or chain. Efficiency of assembly may be reduced when used with synthetic materials.
  • Do not swivel S-322, S-3316 or S-3319 swivel hooks while supporting a load. These hooks are distinguishable by hex nuts and flat washers.
  • The S-3322 swivel hook is designed to rotate under load. The S-3322 is distinguishable from the S-322 by use of a round nut designed to shield bearing. The frequency of bearing lubrication on the S-3322 depends upon frequency and period of product use as well as environmental conditions, which are contingent upon the user’s good judgment.
  • The use of a latch may be mandatory by regulations or safety codes; e.g., OSHA, MSHA, ANSI/ASME B30, Insurance, etc. Note: When using latches, see instructions in “Understanding: The Crosby Group Warnings” for further information found in the Crosby Catalog or website. Also see pages 224 and 225.
  • Always make sure the hook supports the load. (See Figure 3). The latch must never support the load (See Figure 4).
  • When placing two (2) sling legs in hook, make sure the angle from the vertical to the outermost leg 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.
Figure 2

Figure 3


Figure 4


Figure 5


* For two legged slings with angles greater than 90 degrees, use an intermediate link such as a masterlink or bolt type shackle to collect the legs of the slings. The intermediate link can be placed over the hook to provide an in-line load on the hook. This approach must also be used when using assemblies with three or more legs.