Bolt On Transition plate
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Jack Transition Plate – Converts 7” x 5.5” to 3.5” x 5.5” Bolt Pattern (PFJ-MB-Transition)
Adapt Your Trailer to Fit Primary Mover Bolt-On Jacks
The Primary Mover Jack Transition Plate (PFJ-MB-Transition) is designed to solve bolt pattern compatibility issues when installing a bolt-on hydraulic jack.
This plate allows you to convert a 7” x 5.5” trailer bolt pattern to match the Primary Mover jack bolt pattern of 3.5” x 5.5”, making it easy to install our bolt-on jacks on trailers that would otherwise not be compatible.
No cutting, drilling, or fabrication required—just bolt it on and go.
How It Works
This transition plate installs between your trailer and your jack:
- Step 1: Bolt the plate to your trailer using the 7” x 5.5” pattern
- Step 2: Bolt your Primary Mover jack to the plate using the 3.5” x 5.5” pattern
This creates a secure mounting system that bridges the gap between different bolt patterns.
Key Features
- Exact Fit Conversion: Converts 7” x 5.5” to 3.5” x 5.5” bolt pattern
- Perfect for Bolt-On Jacks: Designed specifically for Primary Mover hydraulic jacks
- Heavy-Duty Steel Construction: Approximately 7/8” thick for maximum strength
- No Welding Required: Simple bolt-on installation
- Complete Hardware Included: Bolts, nuts, and lock washers provided
- Expands Compatibility: Works with trailers that don’t match standard jack patterns
Specifications
- SKU: PFJ-MB-Transition
- Material: Heavy-duty steel (~7/8” thick)
- Trailer Bolt Pattern: 7” x 5.5”
- Jack Bolt Pattern: 3.5” x 5.5”
- Mounting Style: Bolt-on transition plate
For exact dimensions and hole spacing, refer to the technical drawing:
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Why This Plate Matters
Not all trailers use the same jack mounting pattern. Without a transition plate, that often means:
- Drilling new holes into your trailer frame
- Welding new brackets
- Being limited to certain jack options
This plate eliminates those issues by allowing you to quickly adapt your trailer to fit a better jack system.
What’s Included
- Transition plate
- Mounting bolts
- Nuts and lock washers
Note: All Primary Mover bolt-on jacks include hardware for mounting directly to this plate.
Recommended Applications
- Dump trailers
- Equipment trailers
- Utility trailers
- Diamond C and similar trailers
- Any trailer with a 7” x 5.5” bolt pattern
Product Videos & Setup Help
Need help confirming fitment or installation?
Click here to view jack installation and setup videos
(Primary Mover Video Library)
Frequently Asked Questions
What bolt patterns does this convert?
It converts a 7” x 5.5” trailer bolt pattern to the Primary Mover 3.5” x 5.5” jack bolt pattern.
Will this work with my trailer?
It will work if your trailer uses a 7” x 5.5” bolt pattern. Always verify your measurements before purchasing.
Does this require welding?
No. This is a fully bolt-on solution.
Is hardware included?
Yes, mounting hardware is included. Additional hardware is also included with Primary Mover jacks.
Can I use this with other jack brands?
It may work with other jacks that share the same bolt pattern, but it is specifically designed for Primary Mover bolt-on jacks.
Benefits of Choosing Primary Mover
- Designed for real-world trailer applications
- Simple solutions to common installation problems
- Heavy-duty materials built to last
- Expert support for trailer and hydraulic systems
- One-year warranty on hydraulic products