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Holloway Houston builds custom slings in-house to your exact specs - any length, WLL, and end fitting combination, with proof testing and cert documentation.
Screw Pin Shackles
Screw Pin Shackles are the industry standard for "pick-and-place" rigging. Featuring a threaded pin for quick assembly and disassembly, they are ideal for temporary lifting applications where equipment is frequently connected and disconnected. Holloway Houston stocks a massive inventory of Screw Pin shackles from Crosby, Green Pin, and Cromox, ranging from 1/3-ton utility shackles to heavy-lift alloy models.
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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).
Brands We Carry
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:
- 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.
- 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).
- Side Loading: When side-loading a bow shackle, the load must be centered in the bow. Never side-load across the pin threads.
Specifications
- WLL range: 1/3 ton (smallest G-209) through 55 tons (largest G-209A alloy)
- Material options: carbon steel (standard), alloy steel (higher WLL at smaller size), stainless steel (Grade 60, for corrosive service)
- Pin type: screw pin — hand-installed, wrench-tightened. Use bolt-type shackles where sustained vibration or side-loading would back the pin out.
- Standards reference: ASME B30.26 covers rigging hardware including shackles used in overhead lifting
- Body shapes: anchor (bow / "O"-shape) and dee (straight), see Use Cases below
USE CASES
Bolt-type shackles are the better match where the connection stays in place under sustained vibration, side-loading, or cyclic loading, the bolt-nut-cotter assembly keeps the pin from backing out. For overhead lifting with angled slings in the bow, anchor shackles carry the load; dee shackles are selected for straight-line pulls where side-loading is not a factor. Manufacturer charts show the WLL reduction that applies when a screw pin shackle is side-loaded.
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Guides & Resources
All Articles
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What is a Shackle?
A shackle is a type of fastener used to connect two or more objects. Shackles are typically made of metal, and they come in a variety of shapes and...
Why Buy from HHI?
HHI builds custom slings in-house to your exact specs — any length, WLL, and end fitting combination.
About Holloway
65+ Years in Business
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Frequently Asked Questions
If you couldn't find your query please write to us wirerope@hollowayhouston.com
Shackle selection starts with the load weight, the pin-to-pin dimension needed for the connection geometry, and whether the application involves side-loading. The manufacturer's WLL chart identifies the rated capacity for each size in standard and side-loaded configurations.
Inspection programs typically look for deformation of the bow or pin, cracks or gouges, pin-to-bow fit (the pin should thread freely and seat fully), and legibility of the WLL and manufacturer identification markings. ASME B30.26 published guidance covers removal-from-service criteria. Holloway Houston's rigging inspection services handle periodic inspections for customers managing inspection cycles.
Synthetic slings connect to screw pin shackles at the bow — but the pin's thread edges can cut into web or round sling fiber over repeated cycles. Sling Saver shackles (Crosby S-253) have a wider bearing surface specifically shaped for synthetic sling contact and are the typical match where synthetic slings see repeated connection cycles at the same hardware.
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