Trailer Coupler / A-Frame / Weld-On Collar-Lok
Bulldog A Frame Trailer Hitch Coupler 7000 lb 2" Ball Collar Lock Low-Profile
Heavy-duty Bulldog A-frame weld-on trailer coupler for 2" hitch balls and standard 50-degree A-frame trailer tongues. Rated for 7,000 lb gross trailer weight.
Part Number: 3B8 Model: 3B8 / 3B8H 2" Ball / 7,000 lb GTW
Key Measurements & Specs
| Specification |
Detail |
| Brand |
Bulldog |
| Part Number |
3B8 |
| Legacy / Model Reference |
3B8 / 3B8H |
| Product Type |
A-frame weld-on trailer coupler |
| Ball Size |
2" |
| Rated Capacity |
7,000 lb gross trailer weight |
| Jack Opening |
2.312" center jack mounting hole |
| Finish |
Gray painted steel |
| Quantity Included |
1 coupler |
Fitment / Application
| Category |
Details |
| Trailer Style |
Utility, cargo, equipment, and other compatible A-frame trailers |
| Primary Fit |
Standard 50-degree A-frame trailer tongue |
| Mounting Style |
Weld-on installation |
| Hitch Ball Requirement |
Requires a 2" hitch ball |
| Fitment Method |
Verify tongue angle, ball size, jack opening, and trailer weight rating before ordering. |
| Important Note |
This is not a bolt-on coupler. Welding is required. |
Top Features
| Feature |
Buyer Benefit |
| Bulldog Collar-Lok Design |
Hinged ball socket design provides secure ball engagement and clear latch operation. |
| 7,000 lb Rating |
Built for heavier A-frame trailer applications when matched to the trailer rating. |
| 2" Ball Fit |
Matches common 2" trailer hitch ball setups. |
| Center Jack Opening |
Accepts common A-frame tongue jack installations using the center jack hole. |
Overview
The Bulldog 028386 A-frame weld-on coupler is a heavy-duty trailer tongue coupler designed for 2" hitch balls and standard 50-degree A-frame trailer tongues. Its Collar-Lok latch design uses a hinged ball socket to clamp securely around the hitch ball for strong, dependable trailer connection.
This coupler is commonly used on utility trailers, cargo trailers, equipment trailers, and other A-frame trailer applications where a 2" ball, 7,000 lb rating, and weld-on installation are required.
R&P Service Insight
Couplers should be selected by ball size, trailer tongue style, mounting method, and rated capacity. A coupler that looks similar may still be wrong if the ball size, A-frame angle, or capacity does not match.
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Ball size matters: This coupler is for 2" hitch balls only.
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Capacity matters: Match the coupler rating to the trailer’s loaded weight and trailer manufacturer requirements.
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Install method matters: This is a weld-on coupler and should be installed by a qualified welder or trailer repair shop.
R&P Knowledge Hub
Compatibility: Designed for standard 50-degree A-frame trailer tongues using a 2" ball coupler setup.
Vehicle / System Fit: This is a trailer-side coupler for the front A-frame tongue of the trailer. It is not vehicle-specific.
Installation Notes: Confirm the trailer tongue angle, coupler position, jack opening, and weld area before installation. Remove old coupler damage, corrosion, or cracked weld material before fitting the replacement.
Performance Insight: Bulldog Collar-Lok couplers are favored for their strong latch feel, secure ball engagement, and serviceable heavy-duty trailer design.
Brand & Fitment Note
Selling Brand: Bulldog
Application Reference: A-frame trailer references describe trailer tongue compatibility only. Always verify by measurement and capacity before ordering.
What This Means: This listing is for one Bulldog 028386 A-frame weld-on Collar-Lok coupler for 2" hitch balls.
Before Ordering: Verify your hitch ball size, trailer tongue style, A-frame angle, rated capacity requirement, jack opening, and installation method.
R&P Repair Insight
Replace a trailer coupler when the latch no longer locks cleanly, the ball socket is worn, the coupler is bent, the tongue has impact damage, or the original coupler has corrosion around the weld area.
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Latch Check: The latch should open, close, and lock positively without excessive play.
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Socket Check: The coupler should not feel loose or sloppy on a correctly sized 2" hitch ball.
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Frame Check: Inspect the A-frame tongue for cracks, bends, rust-through, or previous repair damage before welding on a new coupler.
Features
Bulldog Collar-Lok Coupler
Heavy-duty Bulldog latch system with hinged ball socket action for secure trailer hookup and release.
2" Hitch Ball Application
Designed for trailers using a standard 2" hitch ball connection.
7,000 lb Trailer Rating
Rated for 7,000 lb gross trailer weight when properly matched to the trailer and towing setup.
Standard A-Frame Fit
Fits standard 50-degree A-frame trailer tongues and includes a center jack opening for common trailer jack installations.
Included Components
| Quantity |
Item |
| 1 |
Bulldog 028386 A-frame weld-on Collar-Lok trailer coupler |
| Not Included |
Mounting hardware |
| Not Included |
Safety chains, jack, hitch ball, or welding labor |
Important Fitment Note: This coupler is for 2" hitch balls and standard 50-degree A-frame trailer tongues. Verify ball size, trailer weight rating, tongue angle, jack opening, and installation requirements before ordering. Weld-on couplers should be installed by a qualified welder or trailer repair professional.
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