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Bulldog
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Always the correct part
We know our products
Quality Products
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Designed for utility, horse/livestock, cargo, and construction trailer applications, BULLDOG Collar-Lok are the strongest in the industry. The BULLDOG design features th eonly automatic and continuously tight ball fit in the industry. A variety of coupler styles, tongue mounts, and latches allow configurations to match virtually any trailer. Adjustable couplers assure level operation for trailers when pulled by a variety of different vehicles.
| BRAND: | BULLDOG |
| PART NUMBER: | 028462 |
| WARRANTY: | LIMITED 5 YEAR WARRANTY |
| WEIGHT: | 14 LBS |
| CAPACITY: | 12,500 LBS. |
| COLOR: | GRAY |
| MODEL NUMBER: | 4B4H |
| MATERIAL: | STEEL |
| BALL DIAMETER: | 2.313 IN. |
| MOUNTING HARDWARE INCLUDED: | NO |
| CHANNEL WIDTH: | 3 IN. |
| HITCH CLASS: | V |
| SAFETY CHAINS INCLUDED: | NO |
Founded in 1920, Bulldog has become the standard for heavy-duty trailer connection hardware in agricultural, military and utility service. The line covers gooseneck hitches and couplers, A-frame and channel-mount trailer couplers with the Wedge-Latch mechanism, and heavy-duty jacks, built for unmatched strength, reliability and safety under demanding loads.
Bulldog was founded in 1920 and has spent more than a century supplying the connection hardware that heavy trailers depend on. Its market has always been the demanding end: agricultural, military and utility applications where a coupler failure is not an inconvenience but a serious incident. The brand summarises its position as Tough and Tested, and it sits within the Horizon Global towing group alongside Reese, Draw-Tite, Fulton, Tekonsha, Bargman and Wesbar.
Gooseneck equipment is the brand's signature. Gooseneck hitches mount in the truck bed over the rear axle, which places the load where the chassis can carry it properly and allows far tighter turning than a receiver hitch permits. Matching gooseneck couplers attach at the trailer end, in round tube and square configurations across the capacity range used by livestock, equipment and flatbed trailers.
The conventional trailer coupler range is built around the Wedge-Latch mechanism, which uses a wedge to take up wear between coupler and ball rather than relying on a fixed clamp that loosens over time. That matters on a trailer accumulating hard miles, where slack in the coupling shows up as noise and shock loading. Couplers are offered in A-frame form for standard tongues and in channel-mount form for straight tongue and fabricated frames, with adjustable channel versions that let a coupler be positioned to suit the tongue height.
Heavy-duty jacks complete the line, sized for the tongue weights that gooseneck and equipment trailers generate. Across the range the emphasis is consistent: forged and heavy-section components, load ratings backed by testing, and hardware specified for agricultural, military and heavy-duty commercial use rather than occasional recreational towing.
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Minimum tongue overlap varies by model: 2B, 4B, and 5B models require 8.5"; 3B model requires 6.5"; and some configurations allow 7" or as little as 2.5" (tongue may fit over or into coupler). The coupler internal stop must be butted against the end of the trailer tongue for maximum overlap.
Yes. All welding must be performed by an AWS certified welder. This is a mandatory requirement stated multiple times in the manual.
The manual does not specify whether drilling is required. It states that the number and size of fasteners required must be specified by the trailer manufacturer. Consult your trailer manufacturer or installation documentation for drilling requirements.
Grade 5 bolts with locknuts must be torqued to SAE proof load specifications: 3/8" diameter = 23 ft·lbs; 1/2" diameter = 55 ft·lbs; 5/8" diameter = 110 ft·lbs.
No. Do not tow if the ball is not fully seated in the coupler ball pocket and/or the coupler is not closed. Always visually check that the hitch ball is fully seated before towing.
Always block the trailer wheels before coupling or uncoupling. This prevents the trailer from moving unexpectedly during the operation.
The following procedures should be performed at least annually: check welds and mounting bolt torque, grease the ball pocket, oil pivot points with SAE 30 wt. motor oil, and inspect retaining pins and replace if necessary.
A Bulldog Collar-Lok coupler is a trailer tongue coupler that connects a trailer to a towing vehicle via a hitch ball. It features a collar mechanism that locks the hitch ball in place. The manual covers four models (2B, 3B, 4B, and 5B) with different tongue overlap requirements. The coupler must be properly installed, maintained, and operated according to the manual to safely support the trailer load.
Cequent Performance Products provides a limited five-year warranty covering material defects and workmanship, excluding normal wear and tear. The warranty applies only to the original consumer purchaser and requires installation and use according to the manual instructions. The warranty does not cover damage from abuse, neglect, misuse, accidents, misapplication, overloading, improper installation (including welds), improper maintenance, or unauthorized product alterations. Repair or replacement is the sole remedy; labor and incidental damages are not covered.
Use only the proper ball size as indicated on the coupler body. If you are uncertain which ball size is correct, contact Cequent Performance Products at 1-800-632-3290 or www.cequentgroup.com. Using an incorrect ball size may result in unsafe operation.
The maximum weight capacity is stamped or shown on decals on the coupler body. Do not exceed the lesser of the mounting bracket, coupler, hitch, vehicle, ball, or trailer weight ratings (including load). If you cannot find the capacity marking or are uncertain, contact Cequent Performance Products at 1-800-632-3290 or www.cequentgroup.com.
Grade 5 bolts with locknuts are required; the specific number and size must be specified by the trailer manufacturer. The manual includes a retaining pin and supplied bolts. You will need tools to torque the bolts to the appropriate SAE proof load specifications (3/8" = 23 ft·lbs, 1/2" = 55 ft·lbs, 5/8" = 110 ft·lbs). A 3.0" channel is required but not included. Consult your trailer manufacturer for the complete fastener specification.
The package includes the coupler, a retaining pin, and supplied bolts. A 3.0" channel is required but not included with the coupler. The specific number and size of additional fasteners needed depends on your trailer and must be specified by the trailer manufacturer.
Yes. Before mounting the coupler, confirm that there will be no interference from the tow vehicle, tongue, ground, and any other mounted accessories while stationary or in motion. Check for interference in both open and closed positions before installing, and check again after installation is complete. If interference is found, do not proceed with installation until the issue is resolved.
Assure that the coupler internal stop is butted against the end of the trailer tongue for maximum overlap before securing. This applies to both weld-on and bolt-on installations. The internal stop position ensures proper load distribution and maximum structural integrity.
Weld 3/16" around the interface between the coupler and tongue. No undercut or washout is permitted while welding. All welding must be performed by an AWS certified welder. The coupler internal stop must be butted against the end of the trailer tongue for maximum overlap before welding.
No. The purchaser/owner must not alter or modify the product. Any unauthorized modification will void the warranty and may compromise safety and structural integrity. Only modifications specified in the installation instructions and performed in a workmanlike manner are permitted.
Channel hardware should be tightened to appropriate SAE proof load specifications. The manual references a torque range of 75-100 ft·lbs for channel hardware (as noted in the Spanish language section). However, the primary torque specifications for coupler bolts are: 3/8" = 23 ft·lbs, 1/2" = 55 ft·lbs, 5/8" = 110 ft·lbs. Always use grade 5 hardware and verify the correct specification for your specific installation.
The manual does not mention any electrical connections for the coupler itself. However, the manual does require that all trailer lighting be hooked up and working properly before towing, and that safety chains be properly connected according to SAE J684. These are separate from the coupler installation.
Before towing, perform these checks: (1) Inspect the vehicle, channel, hitch, hitch ball, and coupler for signs of wear or damage; (2) Verify the coupler handle opens and closes freely; (3) Check that the hitch ball is fully seated in the coupler ball pocket, the coupler is closed, and the pin is inserted behind the collar or through the latch; (4) Check channel hardware for wear and proper tightness, replacing any bent, broken, or worn parts; (5) Verify trailer safety chains are properly connected to the towing vehicle and trailer per SAE J684; (6) Confirm all trailer lighting is hooked up and working properly.
Use caution when uncoupling because the tongue may rise suddenly due to negative tongue load. Always block the trailer wheels before uncoupling. Follow the uncoupling procedure for your coupler style (L-Style, H-Style, or M-Style) as detailed in the Operation section of the manual.
When parking or storing your trailer, keep the coupler off the ground so dirt and/or other foreign material will not build up in the coupler ball pocket. Keep the ball pocket and mechanism clean at all times to ensure proper operation.
After installation is complete, check to make sure that coupler operation has not been impaired in any way. Verify that the coupler handle opens and closes freely and that the coupler functions properly. Do not use the coupler if its operation has been impaired. Also check for interference again after installation is complete to ensure no obstructions exist in open and closed positions.
Keep the ball pocket and mechanism clean. At least annually: grease the ball pocket and oil pivot points with SAE 30 wt. motor oil. Also check welds and mounting bolt torque, and inspect retaining pins, replacing them if necessary. When parking or storing the trailer, keep the coupler off the ground to prevent dirt and foreign material from accumulating in the ball pocket.
Grease the ball pocket at least annually. Oil pivot points with SAE 30 wt. motor oil at least annually. No other lubricants are specified in the manual.
Check welds and mounting bolt torque at least annually as part of routine maintenance. If you notice any signs of wear, damage, or looseness, address them immediately before using the coupler.
Do not use the coupler. After installing the channel and/or coupler, if coupler operation has been impaired in any way, do not use it. Similarly, after installation is complete, if you discover that coupler operation has been impaired, do not use it. Contact Cequent Performance Products at 1-800-632-3290 or www.cequentgroup.com for assistance or replacement.
If the coupler handle does not open and close freely, this indicates a problem with the coupler. Do not use it. Check for signs of wear or damage. If the coupler is deformed or damaged, replace the complete coupler and bracket. Contact Cequent Performance Products at 1-800-632-3290 or www.cequentgroup.com if you need replacement parts.
If the coupler and/or channel is deformed or damaged, replace the complete coupler and bracket. Do not attempt to repair or use a damaged coupler. Contact Cequent Performance Products at 1-800-632-3290 or www.cequentgroup.com to order replacement parts. Specify the product model number.
Always replace bent, broken, or worn parts before using the coupler. Check channel hardware for wear and proper tightness regularly. Replace any damaged hardware with grade 5 bolts and locknuts, torqued to the appropriate SAE proof load specifications (3/8" = 23 ft·lbs, 1/2" = 55 ft·lbs, 5/8" = 110 ft·lbs).
Inspect retaining pins at least annually and replace if necessary. A bent or broken pin must be replaced before using the coupler. Do not tow without the pin in place. Contact Cequent Performance Products at 1-800-632-3290 for replacement pins.
| Part Number | Model Number | Capacity (lbs.) | Overall Length (in.) | Latch | Ball Size (in.) | SAE Class |
|---|---|---|---|---|---|---|
| 028382 | 2B4H | 5,000 | 16.25 | High Profile | 2 | III |
| 028444 | 2B4M | 5,000 | 16.25 | Pin Style | 2 | III |
| 028387 | 3B4H | 7,000 | 16.25 | High Profile | 2 | IV |
| 028243 | 3B4M | 7,000 | 16.25 | Pin Style | 2 | IV |
| 028462 | 4B4H | 12,500 | 16.50 | High Profile | 2-5/16 | V |
| 028444 | 4B4M | 12,500 | 16.50 | Pin Style | 2-5/16 | V |
| Replacement Parts | ||||||
| 024200 | High Profile Coupler Repair Kit | |||||
| 500354 | Coupler Cap Spring | |||||
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May 22, 2023
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