Screw Pin Shackles | Heavy-Duty Anchor & Dee Shackles

Screw Pin Anchor & Dee Shackles

When speed and efficiency are paramount, the Screw Pin Shackle is the rigger's go-to hardware. Unlike Bolt-Type shackles which require tools to secure a cotter pin, Screw Pin shackles can be installed quickly by hand (and tightened with a wrench), making them perfect for general lifting, towing, and temporary tie-downs.

Holloway Houston Inc. (HHI) offers one of the largest certified inventories in the USA. We stock the "Big Three" of the shackle world: Crosby (The Red Pin®), Green Pin® (Van Beest), and Cromox (Stainless Steel). Whether you need a standard carbon steel bow shackle or a specialized wide-body shackle for synthetic slings, we have the hardware to match your Working Load Limit (WLL).

The Product Ecosystem

1. Crosby Screw Pin Shackles

The domestic standard for rigging excellence.

• G-209 (Carbon Steel): The classic "Red Pin" anchor shackle. Available in capacities from 1/3 ton to 55 tons.
• G-209A (Alloy Steel): Provides a higher Working Load Limit (WLL) in a physically smaller shackle size compared to carbon steel.
• S-253 (Sling Saver): Specialized "Web Sling Shackles" designed with a wide bearing surface to prevent the shackle from cutting into synthetic nylon or polyester straps.

2. Green Pin® Shackles

Manufactured in The Netherlands, Green Pin is synonymous with quality and durability.

• G-4161: The standard Bow Shackle with a screw pin. Known for its distinct green pin and hot-dip galvanized finish that withstands harsh marine environments.
• Dee Shackles (G-4151): U-shaped shackles designed for straight-line pulls or connecting to beam clamps where side-loading is not a factor.

3. Cromox Stainless Steel Shackles

For corrosive or clean-room environments.

• Models CSA / CSB: High-quality Grade 60 Stainless Steel shackles. Unlike standard hardware store stainless (which is soft and weak), Cromox shackles are engineered for overhead lifting with a 4:1 safety factor.
• Applications: Wastewater treatment, food processing, and subsea rigging.

Bow vs. Dee: Which Shape Do I Need?

• Anchor / Bow Shackles (O-Shape):The rounded "O" shape allows for multi-leg slings to be gathered in the bow without crowding. They are also rated for side-loading (lifting at an angle), provided the WLL is reduced according to the manufacturer's chart.
• Chain / Dee Shackles (U-Shape):The narrow "U" shape is designed for straight-line tension. They are ideal for connecting two pieces of chain or attaching a hoist to a beam clamp. Note: Dee shackles should generally not be side-loaded.

Important Safety: Screw Pin Usage

While Screw Pin shackles are convenient, they have specific limitations compared to Bolt-Type shackles:

1. Rotation Warning: If the load is allowed to rotate or vibrate significantly, friction can unscrew the pin. For long-term or rotating installations, always use a Bolt-Type shackle.
2. Tightening: The pin should be screwed down until the shoulder sits flush against the shackle ear. For lifting, it is recommended to tighten it hand-tight, then back it off slightly (1/4 turn) or mouse the pin if required by site safety rules (though mousing a screw pin is less secure than a bolt/cotter pin).
3. Side Loading: When side-loading a bow shackle, the load must be centered in the bow. Never side-load across the pin threads.

Technical Specifications

• Material: Forged Carbon Steel, Alloy Steel, or Stainless Steel.
• Safety Factor: Typically 6:1 (Crosby/Green Pin) or 4:1 (Cromox).
• Traceability: All HHI shackles are embossed with the Brand, WLL, Trace Code, and Size for full material traceability.
• Sizes: From miniature 3/16" utility shackles to massive 2-1/2" heavy lift shackles.

Browse our inventory below to filter by Brand, Pin Size, and Throat Opening.