TowingMath

Trailer Axle Weight Chart

Common axle capacities, roughly what a bare axle weighs, and how to work out which one is under your trailer.

Reviewed for 2026 against the sources listed at the foot of this page. These are published specifications, not annual figures — the year records when the chart was last checked, not a change in the numbers.

Capacity (GAWR)Lug counts usedBearings, inner / outer Bare axle, estimateBrakesTypical use
2,000 lb 4 or 5 L44649 / L44649 85 - 110 lb usually none Light utility, small boat trailers
3,500 lb 4, 5 or 6 L68149 / L44649 130 - 165 lb electric or none The most common trailer axle. Single-axle utility, small campers
5,200 lb 6, or 8 on idler hubs 25580 / LM67048 165 - 200 lb electric Tandem utility, mid-size travel trailers
6,000 lb 8, or 6 in special applications 25580 / 14125A or 15123 175 - 215 lb electric Larger travel trailers, car haulers
7,000 lb 8, or 5-bolt demount 25580 / 14125A or 15123 215 - 260 lb electric Heavy equipment, large travel trailers, toy haulers
8,000 lb 8 25580 / 02475 250 - 300 lb electric or hydraulic Heavy equipment and commercial trailers

Lug counts and bearing numbers are from Dexter's published bearing replacement chart. Bare axle weights are estimates — we could not find a manufacturer that publishes one, and "bare" is not defined the same way by every seller. Use them as an order of magnitude, not a specification.

Verify before you tow. These figures are a planning aid, not professional or engineering advice. Your real limits are the ones printed on your vehicle's door-jamb placard, your trailer's VIN plate, and your owner's manual - and those override anything calculated here. When numbers are close, weigh the rig and go with the more conservative answer.

How much does a trailer axle weigh?

The most common trailer axle by a wide margin is the 3,500 lb unit, and a bare one is estimated at about 130 to 165 lb. Lighter 2,000 lb axles are estimated from around 85 lb, and an 8,000 lb axle at up to roughly 300 lb.

Those are estimates, not specifications. We could not find a manufacturer that publishes a bare axle weight, so treat them as an order of magnitude — and if you are shipping or lifting an axle, weigh it or ask the seller.

"Bare" means the tube and its spindles, and nothing else. A complete axle as it sits under a trailer also carries:

Each of those adds real weight, so a rolling assembly is considerably heavier than the bare figure. We do not publish a single number for the complete assembly, because it depends entirely on which drums, brakes, springs and tires are fitted — and a made-up average would be worse than no number.

For towing arithmetic, none of this matters. The axle's own weight is already inside the trailer's empty weight, and the only figure that governs is what the trailer actually weighs on a scale. Axle weight is worth knowing when you are shipping an axle, building a trailer, or lifting one into place. For everything else, weigh the trailer.

How to identify your axle

Work through these in order, and stop as soon as you get a definite answer.

  1. Look for the capacity tag. Most axles carry a sticker or stamping on the tube or a spring seat. If it is readable, you are done.
  2. Check the trailer's VIN plate. Usually on the front left of the frame near the coupler. It lists GVWR and the GAWR for each axle. This is the figure that governs legally, and it overrides anything you infer from the hardware.
  3. Read the bearing numbers. Pull a hub and read the number stamped on the inner bearing cone. It narrows capacity to a band that does not overlap the others — see identifying an axle by its bearings below.
  4. Only then look at the lug count, and read it low. Lug count overlaps too much to identify an axle on its own. If it is all you have, assume the lowest capacity that lug count is used on — an 8-lug axle may be a 5,200 lb axle.

The lowest-rated component wins. Axles, tires, wheels, springs and hubs each carry their own rating, and your real capacity is the smallest of them. Tires are the most common weak link because they get replaced over a trailer's life, often with whatever was in stock. Check the load rating on the sidewall against the axle rating - the axle weight calculator compares both for you.

What the lug count does and does not tell you

Counting lugs is the most common way people guess an axle's rating, and it is the least reliable. Dexter, one of the largest trailer axle makers in North America, fits each lug count to a wide spread of capacities:

LugsAxle capacities Dexter fits it toRead it as, if nothing else
4-lug 2,000 - 4,000 lb 2,000 lb
5-lug 2,000 - 4,000 lb, and a 7,000 lb demount wheel 2,000 lb
6-lug 3,500 - 6,000 lb 3,500 lb
8-lug 5,200 - 8,000 lb 5,200 lb

The ranges overlap almost completely. A 6-lug hub turns up on axles from 3,500 lb to 6,000 lb, and an 8-lug hub is used on axles as light as 5,200 lb — so "eight lugs means 7,000 lb", which is repeated widely, can overstate an axle by 1,800 lb.

If lug count is all you have, read the lowest figure, never the highest. Guessing low costs you some capacity you did not use. Guessing high puts more on the axle than it was built for. The VIN plate and the axle tag are the answer; the lugs are a clue.

Identifying an axle by its bearings

The bearing numbers are a far better clue, because each bearing is sized for a spindle and each spindle for a load. The number is stamped on the bearing cone. In Dexter's chart the inner bearing alone sorts axles into bands that do not overlap:

Inner bearing coneBoreAxle capacity
L446491-1/16"2,000 lb
LM670481-1/4"2,800 - 3,000 lb
L681491-3/8"3,500 - 4,400 lb
255801-3/4"5,200 - 8,000 lb

Within a band, the outer bearing and brake size separate the capacities further — the full breakdown is in the table at the top of this page. On a 7,000 lb axle you may also see a 2-1/4" figure quoted for the spindle: that is the seal journal, not a bearing journal. The bearings on that spindle are 1-3/4" inner and 1-1/4" outer.

How to measure a trailer bolt pattern

A bolt pattern is written as the number of studs and the diameter of the circle they sit on — "5 on 4-1/2" is five studs on a 4-1/2" circle. Measure with the wheel off.

4, 6 and 8 lugs

Measure from the centre of one stud to the centre of the stud directly opposite. That distance is the circle diameter.

5 lugs

No stud sits opposite another, so measure between two studs and look the distance up. Both columns are centre to centre:

PatternNext-door studsSkipping one stud
5 on 4-1/2" 2-5/8" (2.645") 4-1/4" (4.280")
5 on 4-3/4" 2-13/16" (2.792") 4-1/2" (4.518")
5 on 5" 2-15/16" (2.939") 4-3/4" (4.755")
5 on 5-1/2" 3-1/4" (3.233") 5-1/4" (5.231")

Or skip the table: multiply the next-door measurement by 1.701, or the skip-one measurement by 1.051, and you have the circle diameter. Those are exact — the studs are 72° apart, so the two spacings are the diameter times sin 36° and sin 72°.

The common shortcut — measure from the edge of one stud to the centre of the stud two along — works because the extra half-stud it adds happens to make up the difference on typical 1/2" studs. It gets you to the right pattern; the table gets you the right number.

Working out load per axle

Tongue weight is carried by the tow vehicle, so it never sits on the trailer's axles. Subtract it first, then divide: 

Weight on axles = Loaded trailer weight - Tongue weight
Load per axle   = Weight on axles / Number of axles

Example, 7,000 lb tandem with 910 lb tongue:
  (7,000 - 910) / 2 = 3,045 lb per axle

An even split is an estimate. Tandem axles rarely carry identical loads in practice, so leave margin, and weigh the trailer if the calculated figure lands close to GAWR.

Common questions

How much does a trailer axle weigh?

Estimates put a bare axle at around 85 lb for a 2,000 lb capacity axle, up to roughly 300 lb for an 8,000 lb axle. A 3,500 lb axle, by far the most common size, is usually estimated at 130 to 165 lb. No manufacturer we could find publishes a bare weight, so treat those as an order of magnitude.

"Bare" means the tube and spindles. Hubs, drums, brakes, springs, wheels and tires all add to it, and by how much depends entirely on which ones are fitted - which is why this page does not quote a single figure for a complete assembly.

How do I identify what axle I have?

Start with the capacity tag or stamping on the axle tube, usually near the centre or on one of the spring seats, and the GAWR on the trailer's VIN plate. Either one is the answer.

If both are gone, read the number stamped on the inner bearing cone. In Dexter's bearing chart those numbers sort axles into capacity bands that do not overlap. Lug count is a much weaker clue: 6-lug hubs appear on axles from 3,500 to 6,000 lb, and 8-lug hubs on axles as light as 5,200 lb. If lug count is all you have, assume the lowest capacity it is used on.

Can I tell axle capacity from the tube size?

It is a useful indicator but not proof. Tube diameter generally rises with capacity, and round versus square tube differs between builders, so the same tube can appear under different ratings.

The capacity that actually governs is the GAWR on the trailer's VIN plate. Guessing high from a tube measurement is exactly the wrong direction to be wrong in.

Do axle ratings include the wheels and tires?

No, and this catches people out. GAWR is defined federally as the capacity of the axle system "as measured at the tire-ground interfaces", but the tires you actually fitted have their own separate load rating.

If your tires are rated lower than the axle, the tires are your real limit. A 7,000 lb axle on tires rated 2,800 lb each is a 5,600 lb axle in practice.

Related tools

Sources