What you’ll need
Tools
- Drill/driverDEWALT 20V MAX Cordless Drill and Impact Driver Combo KitView on Amazon
- Drill bit for pilot holes
- Saw for cutting parts to lengthDEWALT 20V MAX 6-1/2" Circular Saw (Tool Only)View on Amazon
- Tape measureSTANLEY FATMAX Tape Measure, 25-FootView on Amazon
- SquareSWANSON 7" Speed SquareView on Amazon
- Pencil
- Eye protectionDEWALT Dominator Safety Glasses, ANSI Z87.1+, Clear Lens, Black FrameView on Amazon
Materials and supplies
- 2x12 pressure-treated for ground contact, 8' stock for 2 parts
- 4 × #8 × 2 1/2" stainless exterior flat-head screws#8 x 2.5 Stainless Steel Deck Screws, 150Pcs 410 Grade Stainless SteelView on Amazon
- 1 × 120-grit sandpaper, 9" × 11" sheet3M Pro Grade No-Slip Grip Advanced Sandpaper, 120 Grit, 9" x 11" Sheets - 20-Pack for Wood, Metal, and Paint SurfacesView on Amazon
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Cut list
| Part | Qty | Size |
|---|---|---|
| Bottom layer | 1 | 11 1/4" × 11 1/4" × 1 1/2" |
| Top layer | 1 | 11 1/4" × 11 1/4" × 1 1/2" |
Step by step
Prepare the two layers
Inspect the precut squares, drill the top layer and smooth handling edges.
- Reject boards with splits, decay, loose knots or warped faces.
- Mark 4 top layer holes, each 1 1/4" from its two nearest edges.
- Clamp the top layer onto a sacrificial backing board.
- Drill the 4 clearance holes with a 3/16" bit.
- Countersink each hole just enough for a flush screw head.
- Sand splinters and sharp edges with 120-grit paper.
Fasten the layers
Fasten the layers with perpendicular grain and flush perimeter screws.
- Rotate the top square so its grain crosses the bottom grain.
- Align all four outside edges.
- Clamp the layers tightly against a flat work surface.
- Drill bottom layer pilots 1" deep through the clearance holes.
- Drive 4 #8 × 2 1/2" screws until their heads sit flush.
Check before trailer use
Confirm suitability, chock the trailer and center its flat jack foot on the block.
- Confirm the support arrangement with the trailer and jack manufacturers.
- Chock the trailer wheels before operating the jack.
- Place one block on firm, level ground with its entire bottom supported.
- Center the flat jack foot on the top face.
- Lower the jack slowly under its manufacturer's operating instructions.
- Stop immediately at any rocking, sinking, splitting or foot movement.
Questions
How many steps does it take to build a trailer jack block — 11 1/4" × 11 1/4" × 3"?
The plan has 3 steps and 2 parts. How long it takes depends on your tools and experience.
What tools do I need?
Drill/driver, drill bit for pilot holes, saw for cutting parts to length, tape measure, square, pencil and eye protection.
What materials do I need?
2x12 pressure-treated for ground contact, 8' stock, #8 × 2 1/2" stainless exterior flat-head screws and 120-grit sandpaper, 9" × 11" sheet.
How big is it?
As designed: width 11 1/4", height 3" and length 11 1/4".
Can I change the dimensions?
Yes. Tap “Make one for my space” to open this design in Fixie, and Fixie designs a version for your space, tools and needs, with its own cut list, materials and steps. Your first design is free.
This design was generated with AI and has not been checked by a person. Review measurements, materials and instructions before building, and follow the safety guidance for your tools.