Green Pin BigMouth G-4463 Towing Shackle (Safety Bolt & Nut)

The Green Pin BigMouth G-4463 Towing Shackle combines the oversized BigMouth bow with a safety bolt and nut closure, purpose-built for towing and marine applications where vibration and dynamic loads demand a secure, non-loosening pin. The wide bow accommodates heavy-duty towing bridles and large-diameter fittings.

Key Features

• Oversized BigMouth bow for wide slings and towing bridles
• Safety bolt and nut pin prevents accidental loosening under vibration
• Forged alloy steel, quenched and tempered for maximum toughness
• Hot-dip galvanized finish for marine and offshore environments
• Individually proof tested at 2× WLL with certificate
• Designed for dynamic towing loads

Common Applications

• Marine and offshore towing operations
• Anchor chain and mooring connections
• Barge and vessel towing bridle assemblies
• Heavy-duty rigging subject to shock and vibration loads

Why Green Pin?

Green Pin towing shackles are trusted in the world's most demanding marine and offshore environments. Van Beest's rigorous manufacturing process and individual proof testing ensure every shackle performs reliably when safety and uptime depend on it.

Standards & Compliance

Every product we carry is individually marked with Working Load Limit (WLL), manufacturer traceability code, and country of origin. Inspection and mill certificates are available on request — email sales@slingcenter.com with your order number.

Governing Standards

• ASME B30.9 — slings (web, round, wire rope, chain) inspection and use
• ASME B30.26 — rigging hardware (shackles, eye bolts, links, turnbuckles)
• ASME B30.10 — hooks
• OSHA 1910.184 and 1926.251 — general industry and construction sling safety
• WSTDA WS-2 and RS-1 — web and round sling design
• 49 CFR 393.102 to 393.130 — DOT cargo tie-down
• NACM — welded steel chain grade specs

Inspection & Safety

Before every use: visual check for cracks, corrosion, distortion, wear, and illegible markings. Annually (minimum): documented periodic inspection by a trained inspector. Remove from service at first sign of damage. Never repair rigging hardware by welding, heating, or bending.

WARNING: Improper use of rigging can cause death or serious injury. Never exceed the rated Working Load Limit. Apply derating for side-loading, elevated temperature, or chemical exposure. Final application decisions must be made by a Qualified Person per OSHA 1926.32(m).

Chat with our AI rigging specialist

Fastest: click the Ask SlingCenter chat widget in the bottom-right of any page. Our AI specialist is available 24/7 and trained on ASME B30.9, B30.26, OSHA rigging standards, and our full catalog. It can help you size a sling, pick the right shackle, explain inspection criteria, and look up your order.

Prefer to email?

Send to: sales@slingcenter.com

Include:

• What you are lifting (shape, material, fragility)
• Load weight (lb)
• Length / reach needed
• Pick points — smooth lugs, sharp edges, or a hook?
• Environment — indoor, outdoor, heat, saltwater, chemicals?
• Quantity and timeline
• Your phone number if you want a callback

Response: AI chat instant. Email within 1 business day. Urgent orders same-day on standard configurations.