Failure to read, understand, and follow manufactures instructions may cause death or serious injury.

Crosby
Screw pin
&
Bolt type

 Carbon safety factor 6 to 1
Alloy safety factor 5 to 1
Quenched & Tempered
Size Carbon max
W.L.L
Tons     Lbs		 Alloy max
W.L.L
Tons     Lbs		 Weigh per 100
( lbs )
3/16 1/3      666   ------------ 6
1/4 1/2      1000   ------------ 10
3/8    1       2000        2        4000 31
7/16 1 1/2    3000        2.6     5200 38
1/2    2       4000        3.3     6600 72
5/8 3 1/4    6500            5     10000 137
3/4  4 3/4   9500           7     14000 235

 

Brewer 
&
Titcener

 Screw pin
419-S & 419-G
Federal specifications RR-C-271 type IVA
Grade A Class 2
Size Galvanized max
W.L.L
Tons     Lbs		 Alloy max
W.L.L
Tons     Lbs		 Weigh per 100
( lbs )
3/16 1/3      666 ------------ 5
1/4 1/2      1000 ------------ 10
3/8    1       2000      2        4000 30
7/16 1 1/2     3000  ---------- 52
1/2    2       4000      3.3     6600 70
5/8 3 1/4     6500  --------- 130
3/4  4 3/4    9500         7     14000 200

 

Columbus McKinnon

 Theatrical Shackles
Screw pin
Safty factor 6 to 1
Meets fedral specifications RR-C271
Size Micro alloy
Tons     Lbs		 Weigh per 100
( lbs )
1/2    2       4000 75
5/8 3 1/4   6500  130
3/4     5     10000 225

 
Chicago Hardware & Fixture Company
C-1035 Steel
ANCHOR - Round Pin - Screw Pin - Safety
Loads are based on a safety factor of 6 to 1.
Shackles meet Federal Specifications RRC- d Type IV.*
 Size, work load, and trademark are permanently marked on all shackles.
Size Max load
Tons     Lbs		 Weigh per 100
( lbs )
3/16 1/3      666 6
1/4 1/2      1000 10
3/8    1       2000 31
7/16 1 1/2    3000 38
1/2    2       4000 72
5/8 3 1/4     6500  137
3/4 4  3/4    9500 235
7/8 6 1/2             355



ANY DEVIATIONS AS ANGULAR LIFTS, SHOCK LOADS, MODIFICATION OF THE BASIC FORGING, ETC., WILL RESULT IN DRASTICALLY REDUCED MAXIMUM LOADS.

In accordance with good rigging and maintenance practices
All rigging equipment and hardware should be inspected periodically
for wear, abuse and general adequacy.

 

 

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Page maintained by Peter@Rigging.net  Created: 7/24/96 Updated: 5/24/06