Name: Stainless Steel U.S. type Screw Pin Chain Shackle
Brand: H-Lift Industries Co Ltd
SKU: 704116
Availability: InStock
Rating: 5 (1 reviews)

No.704116

The H-Lift Stainless Steel U.S. Type Screw Pin Chain Shackle is a heavy-duty, straight-line (D-shaped) rigging connector manufactured to U.S. RR-C-271 specifications for reliable marine and industrial performance.

Features a classic D-shaped profile designed specifically to support secure, straight-line tension and attach slings to load rings.
Constructed from premium 304 or 316 stainless steel, offering maximum durability and superior rust resistance in harsh, wet, and coastal environments.
Equipped with a threaded screw pin that enables quick, secure attachment and easy detachment during temporary or semi-permanent rigging operations.
Manufactured to meet U.S. RR-C-271 style standards, ensuring consistent geometry, strength, and high structural integrity for demanding applications.

Technical Data
Safe Use of Shackles

The Stainless Steel US Type Screw Pin Chain Shackle (commonly known as a Dee or D Shackle) is manufactured to meet the dimensions and strength standards of US Federal Specification RR-C-271. Its straight-legged shape is specifically engineered for high-efficiency in-line tensioning, making it the industry benchmark for single-leg slings, chain attachments, and general-purpose rigging.

⚠️ SAFETY WARNING: NOT FOR OVERHEAD LIFTING.
Standard stainless steel shackles are NOT rated or certified for overhead lifting or life-safety applications. Never exceed the stamped Working Load Limit (WLL). Always ensure the screw pin is fully seated and tightened before applying load.

✅ US Standard Compliance

Manufactured to adhere to RR-C-271 style specifications. This ensures geometric and dimensional uniformity, allowing for seamless integration with other standardized American rigging hardware.

🏗️ Optimized Straight-Line Design

The straight-sided "D" shape is designed for two-way, straight-line tension. It provides maximum structural stability for in-line pulls in marine mooring, cargo securing, and light-duty industrial lashing.

🛡️ Premium Material Selection

AISI 316 (Marine-Grade): Superior resistance to chlorides and pitting, essential for offshore use.
AISI 304: Strong, rust-resistant option for general outdoor industrial use.

🔩 Efficient Screw Pin

Features a precision-machined threaded pin for fast and secure assembly without tools. This design is perfect for non-permanent rigging where hardware is frequently adjusted or moved.

Technical Specifications

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Item No.	Size (inch)	WLL (lbs)	Pin Dia (inch)	N.W. (kg)	Product Code
S-CS005	3/16	300	1/4	0.017	704116005
S-CS006	1/4	450	5/16	0.030	704116006
S-CS008	5/16	650	3/8	0.065	704116008
S-CS010	3/8	1000	7/16	0.125	704116010
S-CS011	7/16	1450	1/2	0.184	704116011
S-CS013	1/2	1990	5/8	0.230	704116013
S-CS016	5/8	3050	3/4	0.510	704116016
S-CS019	3/4	4475	7/8	0.930	704116019
S-CS022	7/8	6000	1	1.270	704116022
S-CS025	1	7950	1-1/8	1.871	704116025
S-CS028	1-1/8	10500	1-1/4	2.950	704116028
S-CS032	1-1/4	13600	1-3/8	4.000	704116032

Q: When should I choose a Chain (Dee) Shackle over an Anchor (Bow) Shackle? [Image comparing load vectors for a Dee Shackle in-line pull vs a Bow Shackle multi-leg load] A: You should choose a Chain (Dee) Shackle for straight-line tensioning and in-line pulls. If your application involves loads coming from multiple angles or if you are using multi-leg slings, you must use a Bow Shackle, as the rounded shape of the bow prevents dangerous bending stress that can occur when a Dee shackle is side-loaded.

Q: Are these stainless steel shackles rated for overhead lifting? A: No. While these are high-strength stainless steel components, they are not certified for overhead lifting. For cranes, hoists, or lifting operations involving personnel or critical loads, you must strictly use certified alloy steel shackles (such as Grade 80 or Grade 100).

Bolt Type Chain Shackle

Screw Pin Anchor Shackle

Bolt Type Anchor Shackle

Safety Guidelines

Always

Store and handle shackles correctly.
Inspect shackles before use and before placing into storage.
Select the correct pattern of shackle (Dee/Bow) and pin type for the application.
Fully tighten the pin before lifting.
Ensure the load acts through the centre line of the shackle.
Allow for the full resultant imposed load (consider angles).

Never

Use shackles with bent pins or deformed bodies.
Force, hammer, or wedge shackles into position.
Eccentrically load shackles (side loading).
Replace the pin with a standard bolt.
Fit pins in contact with moving parts which may unscrew them.
Shock load shackles.

Selection & Operation Guide

Selecting the Correct Shackle

Type: Use Anchor (Bow) shackles for multi-leg systems or where side loading may occur. Use Chain (Dee) shackles for straight-line pulls.

Pin Type:
• Screw Pin: Suitable for general, non-permanent purposes.
• Bolt Type (Safety Pin): Essential for long-term installations or where the pin may rotate under load.

⚠️ CAUTION: Loading on the Pin BS and ISO Standard shackles are rated for the pin to accept a central point load. Unless stated otherwise, assume the jaw must be fully filled and the load evenly distributed across the full pin width.

Using Shackles Safely

Avoid Side Loading: Position the shackle so the body takes the load along its center line. Use spacers if necessary to center the load on the pin.

Tightening: Tighten screw pins by hand, then lock with a small bar. Do not overtighten to the point of deforming the body. For bolt types, ensure the split cotter pin is fitted.

Choke Hitches: Place the pin through the eye of the sling. Never place the pin in contact with the "bight" of the choke or moving parts, as friction can unscrew the pin.

Maintenance & Storage

Storage: Store in a clean, dry place protected from corrosion. Never modify or galvanize a shackle without supplier approval.

Inspection: Check regularly for: distorted/stretched bodies, bent pins, damaged threads, nicks, gouges, or corrosion. illegible markings. If any defect is found, refer to a Competent Person.