Bulldog Cast Head Flat Plate Trailer Coupler 2‑5/16" Ball 20,000 lbs 4‑1/2" Mount Pattern Gray Primer Coat
Model: 4420000317HEAVY DUTY COUPLERS - CAST COUPLERS
Designed for utility, horse/livestock, cargo, and construction trailer applications, BULLDOG Couplers are the strongest in the industry. The patented cast head “Wedge-Latch®” coupler design is offered in heavyduty, A-frame, and convenient adjustable height models. Adjustable couplers assure level operation for trailers when pulled by a variety of different vehicles. The replaceable latching hardware allows for longer service life.
- Quick and easy to engage
- Strong and secure on the road
- Patented Wedge-Latch® ball clamp design
- Quick to hook up and disconnect
- In compliance with SAE standard J684
| Part Number | 4420000317 |
| Brand | Bulldog |
| Gross Trailer Weight | 20,000 lbs. |
| Ball Size | 2-5/16" |
| Mount | Flat Mount 4-1/2" Pattern |
| Application | Bolt-On or Weld-On |
| SAE Class | N/A |
| Latch | Wedge-Latch |
| Material | Cast Steel |
| Finish | Grey primer coat |
| Warranty | 5 Year |
| Installation Instructions |  |
About Bulldog
$113 93 $133.75 15% OFF
- Best Price on Web Guarantee
- Fastest Shipping
- FREE Shipping
- In Stock
We match lower prices from major authorized retailers for brand-new products in original packaging, provided the item is in stock. The competing seller must be an authorized, professional retail business; offers from
individuals, auctions, peer-to-peer sites, or unauthorized sellers don’t qualify. Used, refurbished, or open-box items are excluded.
Please see our full terms for details.
$133.75 $113 93
Learn more
Questions? Call our Auto Experts at (877) 869-6690
Get it now, pay later
Select installments at checkout to split your purchase into 4 interest-free payments of $28.25 every 2 weeks.
- No fees, ever.
- No impact on your credit score.
Payment options are offered by Affirm and are subject to an eligibility check and might not be available in all states. CA Residents: Loans by Affirm Loan Services, LLC are made or arranged pursuant to a California Finance Lender license.
Installments in partnership with
.
Affirm and its offerings are supported in English only. Translations are not provided by Affirm.
Product Details
- Brand: Bulldog
- Model: 4420000317
- UPC: 016118099010
- Includes: Flat plate coupler
Description
HEAVY DUTY COUPLERS - CAST COUPLERS
Designed for utility, horse/livestock, cargo, and construction trailer applications, BULLDOG Couplers are the strongest in the industry. The patented cast head “Wedge-Latch®” coupler design is offered in heavyduty, A-frame, and convenient adjustable height models. Adjustable couplers assure level operation for trailers when pulled by a variety of different vehicles. The replaceable latching hardware allows for longer service life.
- Quick and easy to engage
- Strong and secure on the road
- Patented Wedge-Latch® ball clamp design
- Quick to hook up and disconnect
- In compliance with SAE standard J684
| Part Number | 4420000317 |
| Brand | Bulldog |
| Gross Trailer Weight | 20,000 lbs. |
| Ball Size | 2-5/16" |
| Mount | Flat Mount 4-1/2" Pattern |
| Application | Bolt-On or Weld-On |
| SAE Class | N/A |
| Latch | Wedge-Latch |
| Material | Cast Steel |
| Finish | Grey primer coat |
| Warranty | 5 Year |
| Installation Instructions | |
About Bulldog
Get Expert Help
Bulldog Cast Head Flat Plate Trailer Coupler 2-5/16" Ball 20,000 lbs 4-1/2" Mount Pattern Gray Primer Coat Install Notes
Installation and Maintenance Instructions for Wedge-Latch® Coupler
Specifications:
- Rated according to SAE J684.
- Minimum tongue overlap: 6.5 inches.
- Only compatible with 50° trailer tongues.
Tools Required:
- Torque wrench
- Grade 5 bolts with locknuts
- SAE 30 wt. motor oil
- Grease for ball pocket
Step-by-Step Instructions:
Weld-On Instructions:
- All welding must be performed by an AWS-certified welder.
- Ensure the coupler’s internal stop is butted against the end of the trailer tongue for maximum overlap.
- Weld both sides and the top using a minimum 3/16" fillet weld.
- Remove any excess paint or primer buildup from the ball pocket and latching mechanism after installation.
Bolt-On Instructions:
- A-Frame Couplers:
- Use mounting holes in the coupler housing to bolt it to tongue members.
- Use Grade 5 bolts with locknuts and torque to SAE proof load specifications:
- Ø 3/8”: 23 ft-lbs.
- Ø 1/2”: 55 ft-lbs.
- Ø 5/8”: 110 ft-lbs.
- Flat-Mount Couplers:
- Insert four (4) 5/8” Grade 5 bolts through the coupler and mounting plate.
- Tighten bolts to 150 ft-lbs.
- Adjustable Height Channels:
- For tongues 6” or less in height, gussets are required.
- Weld a 1/4” minimum fillet weld around the mounting bracket.
- Secure the coupler using (2) 5/8” x 5” Grade 5 bolts through the bracket holes and tighten to 100-110 ft-lbs.
Coupling Instructions:
- Block the trailer wheels.
- Align the hitch ball beneath the coupler ball pocket.
- Open the locking lever and lower the coupler over the hitch ball until it is fully seated.
- Close the locking lever, ensuring the latch engages and the ball clamp is below the hitch ball.
- Optionally, insert a 5/16” pin or lock through the lever.
Uncoupling Instructions:
- Block the trailer wheels.
- Open the locking lever and raise the trailer off the hitch ball.
- Return the handle to the closed position.
Maintenance:
Perform the following procedures at least annually:
- Check set screw torque.
- Grease the ball pocket.
- Oil pivot points with SAE 30 wt. motor oil.
- Inspect retaining pins and replace if necessary.
Safety Notes:
- Never exceed the rated capacities of the coupler, hitch, vehicle, or trailer.
- Always use the correct hitch ball size as indicated on the coupler body.
- Inspect coupler components regularly and replace worn or damaged parts.
- Ensure trailer safety chains and lights comply with SAE J684 standards.
Warranty Information:
Attention: This is a summary of warranty coverage. For detailed warranty instructions, please download the full installation PDF.
- Limited Warranty:
- Coverage includes 5 years for select brands and 1 year for others.
- Exclusions include normal wear and tear, damage from misuse, improper installation, or modifications.
For Technical Support: Our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
For Warranty Information: Warranty coverage details are available in the full installation PDF. Please download the PDF for complete instructions.
People Also Bought
