Name: Stainless Steel U.S. type Screw Pin Anchor Shackle
Brand: H-Lift Industries Co Ltd
SKU: 704121
Availability: InStock
Rating: 5 (1 reviews)

No.704121

The H-Lift Stainless Steel U.S. Type Screw Pin Anchor Shackle is a heavy-duty, bow-shaped rigging connector designed to U.S. RR-C-271 specifications, ideal for reliable multi-directional loading in demanding environments.

Features a wider, rounded bow shape that easily accommodates multiple slings, thicker ropes, or larger hardware, safely supporting multi-directional pulling without side-loading failure.
Constructed from premium marine-grade stainless steel to provide maximum durability and outstanding resistance to rust and corrosion in coastal, saltwater, and industrial settings.
Equipped with a convenient threaded screw pin that allows for fast, secure assembly and disassembly during temporary or semi-permanent rigging operations.
Manufactured to meet U.S. Federal Specification RR-C-271 design standards, ensuring consistent geometry, strength, and high structural integrity.

Technical Data
Safe Use of Shackles

The Stainless Steel US Type Screw Pin Anchor Shackle (also known as a Bow Shackle) is manufactured to strictly adhere to the standardized dimensions and strength requirements of US Federal Specification RR-C-271. Its distinctive rounded O-shape allows it to handle tension from multiple directions, making it the premier choice for multi-leg sling systems, offshore rigging, and marine anchoring.

⚠️ SAFETY WARNING: WORKING LOAD LIMITS.
Always strictly adhere to the stamped Working Load Limit (WLL). While AISI 316 provides the ultimate level of corrosion resistance, these shackles must be inspected before every use for deformation or wear. Standard stainless shackles are typically not rated for critical industrial overhead lifting.

✅ US Federal Compliance

Manufactured to meet RR-C-271 style specifications. This ensures geometric consistency and load-bearing reliability for North American and international rigging projects.

⚓ Multi-Directional Bow Design

The rounded "bow" shape allows for greater flexibility. It can safely handle multi-leg sling legs or multi-directional loads without creating the dangerous side-loading stress associated with straight Dee shackles.

🌊 Premium Marine-Grade Steel

Forged from high-quality AISI 316 stainless steel. This material offers superior resistance to saltwater corrosion, chloride pitting, and harsh chemicals in offshore environments.

🔩 Rapid Screw Pin Mechanism

Features a high-precision threaded screw pin for fast, tool-free assembly and disassembly. Ideal for non-permanent rigging and temporary anchoring applications.

⚙️ Related Products & Hardware Pairings:

• In-Line Pull Alternatives: For straight-line tensioning and single-leg slings, view our Stainless Steel US Type Chain Shackles.
• Safety Pin Options: For permanent mooring where pins may rotate under vibration, see our Bolt Type Safety Shackles.
• Chain Connections: Securely attach your bow shackle to our compatible Stainless Steel DIN 766 Chain.

Technical Specifications

← Swipe table left and right to view all data →

Item No.	Size (inch)	WLL (lbs)	Pin Dia (inch)	N.W. (kg)	Product Code
S-AS005	3/16	300	1/4	0.021	704121005
S-AS006	1/4	450	5/16	0.036	704121006
S-AS008	5/16	650	3/8	0.077	704121008
S-AS010	3/8	1000	7/16	0.138	704121010
S-AS011	7/16	1450	1/2	0.175	704121011
S-AS013	1/2	1990	5/8	0.261	704121013
S-AS016	5/8	3050	3/4	0.552	704121016
S-AS019	3/4	4475	7/8	1.020	704121019
S-AS022	7/8	6000	1	1.600	704121022
S-AS025	1	7950	1-1/8	2.400	704121025
S-AS028	1-1/8	10500	1-1/4	3.140	704121028
S-AS032	1-1/4	13600	1-3/8	4.380	704121032

Q: When should I choose an Anchor (Bow) Shackle over a Chain (Dee) Shackle? [Image showing load distribution on a bow shackle vs a dee shackle during multi-directional pulls] A: You should always choose an Anchor (Bow) Shackle if you are using a multi-leg sling or if the load will apply tension from different angles. The rounded bow allows the load to shift within the loop without applying dangerous side-loading stress to the shackle legs, which can cause Dee shackles to bend or fail.

Q: Does the "Size" refer to the pin or the body? A: Per US Federal specification practice, the size refers to the diameter of the body (the bow). Importantly, the pin diameter will always be one size larger than the body size (for example, a 1/2" shackle will have a 5/8" pin). Always ensure your connecting hardware accounts for this larger pin diameter.

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.