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Crosby® Shackle and Hook Load Limits

CrosbyCrosby Quic-Check

Shackles – Quenched & Tempered

Screw Pin and Bolt Type

Design Factor:
Carbon Shackle – 6/1
Alloy Shackle – 5/1

Nominal Size (in.) Diameter of Bow Carbon Maximum Working Load (Tons) Alloy Maximum Working Load (Tons) Inside Width at Pin (in.) Diameter of Pin
3/16 1/3 n/a .38 .25
1/4 1/2 n/a .47 .31
5/16 3/4 n/a .53 .38
3/8 1 2 .66 .44
7/16 1-1/2 2.6 .75 .50
1/2 2 3.3 .81 .63
5/8 3-1/4 5 1.06 .75
3/4 4-3/4 7 1.25 .88
7/8 6-1/2 9.5 1.44 1.00
1 8-1/2 12.5 1.69 1.13
1-1/8 9-1/2 15 1.81 1.25
1-1/4 12 18 2.03 1.38
1-3/8 13-1/2 21 2.25 1.50
1-1/2 17 30 2.38 1.63
  • Insure screw pin is tight before each lift.
  • Use bolt type shackle for permanent installation.
  • Do not side load round pin shackle.
  • Use screw pin or bolt type to collect slings.
Shackle load limit

Maximum included angle: 120°

Hooks – Quenched & Tempered

Shank, Swivel, & Eye Hook

Eyehook Design Factor: 5/1
(Except alloy 30 ton and larger are 4-1/2 to 1)
Shank and Swivel Design Factor: 4-1/2 to 1

Nominal Size (in.) Diameter of Bow Carbon Maximum Working Load (Tons) Code Alloy Maximum Working Load (Tons) Code Throat Opening (in.) Deformation Indicator A-A
3/16 3/4 DC 1 DA .88 1.50
1/4 1 FC 1-1/2 FA .97 2.00
5/16 1-1/2 GC 2 GA 1.00 2.00
3/8 2 HC 3 HA 1.12 2.00
7/16 3 IC *4-1/2 /5 IA 1.06 2.50
1/2 5 JC 7 JA 1.50 3.00
5/8 7-1/2 KC 11 KA 1.75 4.00
3/4 10 LC 15 LA 1.91 4.00
7/8 15 NC 22 NA 2.75 5.00
1 20 OC 30 OA 3.25 6.50
1-1/8 25 PC 37 PA 3.00 7.00
1-1/4 30 SC 45 SA 3.38 8.00
1-3/8 40 TC 60 TA 4.12 10.00

*320 Eye Hook is now rated at 5 tons

  • Do not sideload.
  • Do not tip load.
  • Do not backload.
Hook Load Limit

Maximum included angle: 90°

Eye Hook

Eye Hook

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