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Catalog provided courtesy of The Crosby Group, Inc.
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Page 113

Read and Understand These Instructions
Before Using Hooks

Important — Basic Machining and Thread Information
Read and Follow
  • Wrong thread and/or shank size can cause stripping and loss of load.
  • The maximum diameter is the largest diameter, after cleanup, that 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% of the nut engaged length.

Crosby Hook Identification & Working Load Limit Chart †


Hook Identification		 Working Load Limit
(t)		 Maximum
Shank
Diameter
after
Machining
(in.)		 Minimum Thread Size
319-C
319-CN
320-C
320-CN
322-C		 319-A
319-AN
320-A
320-AN
322-A		 319-BN 319-C
319-CN
320-C
320-CN
322-CN		 319-A
319-AN
320-A
320-AN
322-AN		 319-BN 319-C
319-CN
(Carbon)		 319-A
319-AN
(Alloy)
319-BN
(Bronze)
DC DA DB .75 1 .5 .53 1/2 - 13 unc 1/2 - 13 unc
FC FA FB 1 1.5 .6 .62 5/8 - 11 unc 5/8 - 11 unc
GC GA GB 1.5 2 1 .66 5/8 - 11 unc 5/8 - 11 unc
HC HA HB 2 3 1.4 .81 3/4 - 10 unc 3/4 - 10 unc
IC IA IB 3 *4.5 / 5 2.0 1.03 7/8 - 9 unc 7/8 - 9 unc
JC JA JB 5 7 3.5 1.27 1-1/8 - 7 unc 1-1/8 - 7 unc
KC KA KB 7.5 11 5.0 1.52 1-1/4 - 7 unc 1-3/8 - 6 unc
LC LA LB 10 15 6.5 1.75 1-5/8 - 8 un 1-5/8 - 8 un
NC NA NB 15 22 10 2.00 2 - 8 un 2 - 8 un
OC OA — 20 30 — 2.50 2-1/4 - 8 un 2-1/4 - 8 un
PC PA — 25 37 — 3.50 2-3/4 - 8 un 2-3/4 - 8 un
SC SA — 30 45 — 3.50 3 - 8 un 3 - 8 un
TC TA — 40 60 — 4.00 3-1/4 - 8 un 3-1/2 - 8 un
UC UA — 50 75 — 4.50 3-3/4 - 8 un 4 - 4 unc
— WA — — 100 — 6.12 — 4-1/2 - 8 un
— XA — — 150 — 6.38 — 5-1/2 - 8 un
— YA — — 200 — 7.00 — 6-1/4 - 8 un
— ZA — — 300 — 8.62 — 7-1/2 - 8 un
*  319AN and 320-AN are rated at 5 tons.
†  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 used 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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