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| Product: | DRSPA750 |
|---|
| Approx. Weight Each: | 2.34 lbs. |
| Working Load Limit: | 4 - 3/4 Tons |
| Pin Diameter: | .875" |
| Throat Opening: | 1.25" |
Shackles and clevises are U-shaped mechanical couplers closed by a pin or bolt. Shackles are primarily used in construction, rigging and lifting. A clevis is used in less demanding applications such as farming and towing.
(Entry 1 of 2) 1 : something (such as a manacle or fetter) that confines the legs or arms. 2 : something that checks or prevents free action as if by fetters —usually used in plural. 3 : a usually U-shaped fastening device secured by a bolt or pin through holes in the end of the two arms.
The Green Pin® Bow Shackle BN is a bow shackle with a safety bolt. The shackle offers a double safety (split pin and safety bolt) which prevents accidental unscrewing of the pin. Of course, the Green Pin® Bow Shackle BN conforms to a wide range of certifications from class societies such as DNV GL.
The clevis is a U-shaped piece that has holes at the end of the prongs to accept the clevis pin. The combination of a simple clevis fitted with a pin is commonly called a shackle, although a clevis and pin is only one of the many forms a shackle may take.
A shackle is a u-shaped, load-bearing connecting device designed to be used with a removable pin. Shackles can be used in a number of different rigging and load securement applications to connect different types of lifting slings, chain, or rope to an object or to each other.
A shot, one of the forged lengths of chain joined by shackles to form an anchor cable, was usually 15 fathoms (90 ft; 27 m). A shackle, a length of cable or chain equal to 12 1⁄2fathoms (75 ft; 22.9 m). In 1949, the British navy redefined the shackle to be 15 fathoms (90 ft; 27 m).
Screw pin shackles can be used for applications involving side-loading circumstances. Reduced Work Load Limits are required for side-loading applications. Tighten screw pin before each pick. Bolt-Type Shackles can be used in any application where round pin or screw pin shackles are used.
Shackles are the primary connecting link in all manner of rigging systems, from boats and ships to industrial crane rigging, as they allow different rigging subsets to be connected or disconnected quickly. A shackle is also the similarly shaped piece of metal used with a locking mechanism in padlocks.
The load applied to the shackle should be centered in the bow of the shackle to prevent side loading of the shackle. Multiple sling legs should not be applied to the shackle pin.
For over head lifting operations, shackles with screw pins or bolts must be used. Hand tighten the shackle pin when using. Do not back off the pin once the pin shoulder contacts the shackle body. When lifting with one sling, make sure the sling is centered (0 – 5 degrees) in the bow of the shackle for maximum capacity.
The best thing to do when tightening down shackle bolts is to use lock nuts and tighten them until they are snug and then backed off 1/4 turn. Lock nuts should be used because they resist loosening with vibration or torque.
Lifting Shackles are connection link, used to make a connection between the load lifting device (hoist hook / sling) and the load to be lifted.
Measure the outside diameter of the clevis in the saddle of the bow. The outside diameter of the clevis determines the load capacity of the shackle. The caliper measures four different dimensions: outside diameter, inside diameter, depth and step.
What method do you use? Seizing wire (stainless or Monel) wrapped a couple times through the eye of the shackle pin and around the nearest "ear" of the shackle. Then wrap both ends around the middle of the loops a couple times to snug up the loops. After that grab both ends with safety wire pliers and twist.
Shackles – Quenched & Tempered
| Nominal Size (in.) Diameter of Bow | Carbon Maximum Working Load (Tons) | Alloy Maximum Working Load (Tons) |
|---|
| 3/8 | 1 | 2 |
| 7/16 | 1-1/2 | 2.6 |
| 1/2 | 2 | 3.3 |
| 5/8 | 3-1/4 | 5 |
Weight Each: 1.46 lbs. Never exceed Working Load Limit. Inspect Shackles regularly.
"Normal" 4x4 Recovery Shackle SizesThe most common D ring shackles in the 4x4 recovery world are the 9,500 lb. 3/4" shackle and the 13,000 lb. 7/8" shackle. They're provided in tons of winching kits and are probably the first winch accessory that you'll buy.
Calculating the Weight of a Load
- Step 1: Determine the Volume of the Load. Rectangle/Square: Volume = Length x Width x Height.
- Step 2: Determine the Material You'll Be Lifting. The table below can be used for approximate weight values of common loads and materials:
- Step 3: Determine the Weight of Object.
Working Load Limit (WLL) is the maximum working load designed by the manufacturer. This load represents a force that is much less than that required to make the lifting equipment fail or yield.
EXAMPLE: You need to lift a load of 15 tons (30,000 pounds) a distance of 25 feet. The distance is measured from the center pin of the crane to the center of the load. Once you determine the distance, look on that line for the largest capacity; that will indicate how many feet of boom must be extended.
- Determine the Load Factor (LAF): Divide the leg length (L) by the headroom (H) L ÷ H = LF.
- Determine the Share of the Load (SOL) for the individual sling legs: Divide the load weight by the number of sling legs.
- Multiply Load Factor by the Share of the Load to determine Sling Tension.
Crane radius is the measurement from the center of rotation to the center of the hook (fig. 3-16). The crane is weight-tested with the boom rotated ninety (90) degrees from the longitudinal axis of the crane carrier.
