Demco B&W Gooseneck to Industry Standard 5th Wheel Adapter 6140

Convert your existing gooseneck setup to tow a fifth wheel with the Demco B&W Gooseneck to Industry-Standard 5th Wheel Adapter (Part #6140). This rugged, drop-in adapter lets you use a standard fifth wheel hitch on a truck that's already set up with a B&W Turnoverball gooseneck — giving you the flexibility to tow both styles without permanent hardware or bed modifications.

Use Your Turnoverball for Fifth Wheels

If your truck has a B&W Turnoverball gooseneck hitch but you want to tow a fifth wheel, this adapter makes the switch simple. It drops into the gooseneck ball hole and provides a set of above-bed industry-standard rails ready to accept your fifth wheel hitch. The fit is solid and positive — tight enough that it feels like part of the truck once secured.

Built for Heavy-Duty Towing

The 6140 is built for serious work, with:

• 21,000 lb Gross Towing Weight (GTW) rating
• 5,250 lb vertical load limit

When you're hitched to a heavy trailer, the adapter delivers dependable strength with no flex or slop. Black powder-coated steel construction adds long-term durability and corrosion resistance so you can rely on it season after season.

Quick, Drop-In Installation

No drilling, no permanent hardware. Just lower the adapter into the gooseneck opening, lock it in place, and tighten the adjustment bolt for a solid bed fit. When you want your bed cleared for hauling other gear, pull it out — when you need to tow again, drop it right back in. Made in the USA.

Adjusts for Bed Mats and Liners

If your truck has a bed mat or spray-in liner that changes the bed surface height, the adjustable mount compensates so the base plate sits flush every time. The adjustment bolt draws the adapter tight against the bed floor, eliminating rocking or movement and keeping your fifth wheel rails perfectly level and your connection steady.

Works with Most Industry-Standard Hitches

The 6140 fits fifth wheel hitches from most major brands:

• Demco Hijacker Premier Series
• B&W
• Curt
• Draw-Tite
• Hidden Hitch
• Husky
• Reese
• Valley

⚠️ Important Compatibility Notes

Please review these compatibility restrictions before ordering:

• Do NOT use with the Demco Hijacker Autoslide hitch or any other automatic sliding fifth-wheel hitch.
• Do NOT use with the B&W Patriot slider fifth-wheel hitch.
• Demco Hijacker 5th-wheel hitches manufactured before 2012 do not fit industry-standard universal rails — confirm your hitch year.
• Does NOT work with the B&W BWGNRK1257 Turnoverball for 2007–2021 Toyota Tundras.
• When using this adapter, you may need to remove the safety chain loops from your gooseneck hitch if they are mounted front/back rather than side to side.

Key Features

• Drops into B&W Turnoverball gooseneck for above-bed fifth wheel rails
• 21,000 lb GTW / 5,250 lb vertical load capacity
• Works with major industry-standard fifth wheel hitches (Demco, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, Valley)
• Quick drop-in installation — no drilling, no permanent hardware
• Adjustable mount for flush fit with bed mats or liners
• Durable powder-coated steel in black
• Removable when not towing — keeps bed practical
• Made in USA
• Install hardware included
• Backed by a 5-year warranty

Specifications

• Brand: Demco
• Model: 6140
• Type: Gooseneck to Industry-Standard 5th Wheel Adapter
• Gross Towing Weight (GTW): 21,000 lbs
• Vertical Load Limit: 5,250 lbs
• Material: Powder-coated steel
• Color: Black
• Compatibility: B&W Turnoverball gooseneck ball
• Hitch Compatibility: Demco Hijacker Premier Series, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, Valley
• Auto-Sliding Hitch Compatibility: NOT recommended
• Installation: Drop-in, no drilling required
• Country of Origin: USA
• Includes: Adapter and install hardware
• Warranty: 5-year