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Boat Trailer Cross Members

These are 3 inch by 3 inch Aluminum Square Tubing Boat Trailer crossmembers. Typically you can mount on these crossmembers using bolts or u bolts. Each listing for Aluminum Crossmembers will have links to the Bolts and U Bolts section of our website so your can purchase the hardware to complete your install. We have the U Bolts available in stainless steel also to prevent rust permanently. The Size U-Bolt that is Typically used when mounting these cross beams to an I-Beam Frame, which is the most common application, would be the 1/2" x 3 1/16" x 4 5/16" U-Bolt. We would recommend using the Stainless Steel U-Bolts as Aluminum and Stainless Steel will provide the best level of corrosion protection. You could used one or two U-Bolts per side, drilling holes up through the I-Beam if necessary, but in most cases when purchasing a replacement, the holes will already be present and in the correct location.
The commonly used mounting hardware is included in this category for easy selection.
Total Items: 12
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Stainless Steel 12 x 1 Hex HD Screw
Item Sku: 100773
MPN: N/A

#12 x 1 Size Hex Head Self Tapping Screw

Popular uses: Securing Skid Pads to Crossmembers

Stainless Steel will not rust
Self-Tapping Stainless Steel Screw
$0.59
In Stock
1/2 inch Diameter by 1 1/2 inch Long Stainless Steel Bolt
Item Sku: 100695
MPN: N/A

1/2"-13 Thread - Length 1 1/2" Shank

Popular uses: Bunk Brackets, Spring Hangers, Crossmember, Frame Bolt

Includes Stainless Steel Hardware
Stainless Steel 1/2 inch Bolt by 1 1/2 inch long
$3.72
In Stock
Galvanized U-Bolt 1/2 inch x 3 inch x 4 5/16 inch for Boat Trailer
Item Sku: 100408
MPN: N/A

Mounts to 3" Wide/Tall Material - Usually 3" wide x 3" tall Tubing

Popular uses: Bunk Brackets, Crossmembers, Roller Brackets

Hot Dipped Galvanized Finish Great for Boat Trailers - Includes Hardware
1/2 x 3 x4 5/16 Galv Ubolt
$5.36
In Stock
Stainless Steel U-Bolt 1/2 inch x 3 inch x 4 5/16 inch Trailer U-Bolt
Item Sku: 100414
MPN: N/A

Mounts to 3" Wide/Tall Material - Usually 3" Wide x 3" Tall Tubing

Popular uses: Bunk Brackets, Crossmembers, Roller Brackets

Stainless Steel Finish Great for Boat Trailers - Includes Hardware
1/2 x 3 x 4 5/16 SS U-Bolt Trailer Mounting Hardware
$8.61
In Stock
12x2 inch Stoltz Boat Trailer Skid Pad
Item Sku: 101209
MPN: PAD-2112

Highest Quality Polyurethane Skid Pad on the Market

Mounts to 2" Wide Frame or Trailer Axle

Mounts with (4) Self Tapping Screws (Not Included)
12 inch Stoltz Skid Pad
Sale
$16.69  $10.52
In Stock
12x3 inch Stoltz Boat Trailer Skid Pad Cross Member Protector
Item Sku: 100477
MPN: PAD-3112

12" Long Skid Pad 3" Wide Mounting Surface

Mounts to 3" Wide Cross Member or Frame

Stoltz Products are the best in the Industry
12 inch Stoltz Skid Pad
$17.95
In Stock
12x4 inch Stoltz Boat Trailer Skid Pad
Item Sku: 101210
MPN: PAD-4112

Highest Quality Polyurethane Skid Pad on the Market

Mounts to 4" Wide Frame or Trailer Axle

Mounts with (4) Self Tapping Screws (Not Included)
12 inch Stoltz Skid Pad
$19.47
In Stock
Boat Trailer Frame Aluminum Cross Member 3 in x 3 in x 59 inches
Item Sku: 100388
MPN: N/A

Measures 58 1/2" Long - Made from 1/4" thick aluminum tubing

Simply drill holes to mount with bolts or use 1/2" x 3" x 4 5/16" U Bolts

Great for Boat Trailers - Aluminum will not rust
Trailer Frame Cross Member for Boat Trailers
$139.97
In Stock
Boat Trailer Frame Aluminum Cross Member 72 inch Straight 3 x 3
Item Sku: 100997
MPN: N/A

Measures 71 1/2" Long and 3" x 3" - Made from 1/4" thick aluminum

Simply drill holes to mount with bolts or use 1/2" x 3" x 4 5/16" U Bolts

Aluminum tubing will not rust
Aluminum Square 3 inch by 3 inch Boat Trailer Frame Cross Member
$140.91
In Stock
Galvanized Boat Trailer Cross Member 85 inch V Bend Frame Mount
Item Sku: 100996
MPN: 69-849-018

Measures 85" Long and 3" x 3" - Made from 11 Gauge Galvanized Steel

Simply drill holes to mount with bolts or use 1/2" x 3" x 4 5/16" U Bolts

Hot Dipped Galvanized material is Great for Boat Trailers
Boat Trailer Frame Cross Member 85 inch V Bend Style
Sale
$161.93  $106.88
Item is out of stock
Boat Trailer Frame Aluminum Cross Member 3 in x 3 in x 72 in V-Bend
Item Sku: 100394
MPN: N/A

Measures 71 1/2" Long - Made from 1/4" thick aluminum tubing

Simply drill holes to mount with bolts or use 1/2" x 3" x 4 5/16" U Bolts

Great for Boat Trailers - Aluminum will not rust
Trailer Frame Cross Member
$169.96
In Stock
Boat Trailer V-Bend Aluminum Trailer Cross Member 80 inch Long
Item Sku: 100395
MPN: N/A

Measures 79 1/2" Long - Made from 1/4" thick aluminum tubing

Simply drill holes to mount with bolts or use 1/2" x 3" x 4 5/16" U Bolts

Great for Boat Trailers - Aluminum will not rust
Boat Trailer CrossMember
$190.01
In Stock
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