How to
determine what axle you have:
Most common utility
trailer axles fall into two types, and
only three sizes.
The two axle types:
Rubber Ride Torsion (no
springs)
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Conventional Leaf Spring
(either straight or dropped)
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The
Three Basic Sizes:
Typical
Rating
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Axle tube
OD Size
(spring axle only)
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Spindle
Number
(see chart below)
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Outer Bearing
ID Size
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Inner Bearing
ID Size
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Seal ID
Size
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Brake drum
Size
(Bolt pattern)
(See
chart below)
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Dust cap
ID Size
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2000#-2200#
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1.75"
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BT8
or
BTR
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1.000"
(L44643)
1.063" (L44649)
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Same
as Outer
Bearing
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1.25"
(12192TB) or
1.50" (10-60)
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7" (4x4
or 4x4.5)
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1.78
or
1.98"
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3500#
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2.375"
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#84
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1.063"
(L44649)
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1.375"(L68149)
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1.75"
(10-19)***
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10" 5 Lug (4.5"/4.75"/
5.0"/5.5")+(6x5.5") |
1.98"
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5200#-7000#
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3.00"
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#42
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1.25"
(15123) (LD)*
1.25" (14125A) (HD) |
1.75"
( 25580)
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2.125
(10-10)*
2.250 (10-36)
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12" (6x5.5"
or 8x6.5")
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2.44"
or
2.71"
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As you can see, there are only 3
basic sizes of axles:
With
4, 6 and 8 bolt Wheels, just measure across
to the opposite lug to get the bolt circle.
On 5 bolt wheels, you must use the chart
below to figure your bolt circle:
How to measure your axle, (to order a
replacement)
* Notes:
- There are many other less
common axles out there, this covers "Most"
axles 7000# and lighter
- Mobile home axles may or may
not use standard parts, you have to look
inside yourself.
- The large #42 spindle can
have either 2.25 or 2.125 ID seals, you
have to check.
- Not all axles have brakes,
but the bearing sizes are still the same,
either brake or idler.
- Rarely, I have seen a LM67048
Outer bearing used on the #42 spindle
(light duty)
*** on Some Square Tube axles, found
almost always on Boat Trailers (EZ Loader,
Ranger, etc) Made by UFP, the grease seal will
be slightly smaller ID of 1.68". If you
have a boat trailer with a square tube axle,
check your seal size before ordering.
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