Freight Class for Auto Parts
Most packaged auto parts ship at freight class 60 to 85 — they're dense and durable, so they rate low.
What is the freight class for auto parts?
Metal auto components pack densely, which keeps the class down. Bulky body panels or light plastic trim are the exceptions, rating higher because they take up space for little weight. Palletizing mixed parts together improves overall density.
Because freight class is density-driven, there isn’t a single fixed number for auto parts — class 60–85 is the common range. Run your actual dimensions and weight below to pin it down.
Two commodities wearing one name
"Auto parts" covers two kinds of freight that behave nothing alike. Hard parts — rotors, castings, bearings, gears — are boxed metal that stacks into some of the densest general freight on the road, comfortably class 60 territory. Everything wrapped around the drivetrain — air filters, plastic trim, molded bumper covers, upholstery kits — is engineered lightness that rates with the bulky classes. A parts distributor ships both every day, often on the same order.
That mix is where the money leaks. Blend a heavy case of rotors with cartons of filters on one pallet and the unit's blended density splits the difference — which means the rotors, which would have rated class 60 alone, ship at the blended class of 92.5 or worse. The light freight gets a discount; the dense freight pays for it. Whether that trade helps or hurts depends entirely on the ratio, and it's checkable in a minute.
Auto Parts freight class: worked examples
Density is weight ÷ volume (cubic feet = L × W × H in inches ÷ 1,728). Here is how typical auto parts shipments measure out:
Cased brake rotors — class 60
Boxed rotors on a compact 40" × 34" pallet, 30" high, 780 lb.
40 × 34 × 30 = 40,800 in³ ÷ 1,728 = 23.6 ft³. Density = 780 lb ÷ 23.6 ft³.
33.0 lb/ft³ → class 60 — hard parts are among the densest general freight.
A blended mixed-parts pallet — class 92.5
Rotor cases below, filters and trim cartons above, 48" × 40" × 50", 640 lb.
48 × 40 × 50 = 96,000 in³ ÷ 1,728 = 55.6 ft³. Density = 640 lb ÷ 55.6 ft³.
11.5 lb/ft³ → class 92.5. The rotors just paid the filters' rate.
Air filters shipped alone — class 175
Filter cartons stacked 60" high on a 48" × 40" pallet, 380 lb.
48 × 40 × 60 = 115,200 in³ ÷ 1,728 = 66.7 ft³. Density = 380 lb ÷ 66.7 ft³.
5.7 lb/ft³ → class 175. Filters are boxes of air — blending hides that cost but doesn't remove it.
Sort dense from light before the dock
The working rule for mixed parts orders: when the dense freight dominates by weight, keep it pure — a low, tight pallet of hard parts at class 60–65, and let the light cartons take their own (worse) class on their own smaller unit. When light freight dominates, invert it: use the dense cases as ballast inside the light pallet to drag the blend down a class. The break-even sits in the middle ratios, so run both configurations rather than guessing.
Two category-specific notes. Batteries ship dense but carry their own rules — many carriers require them upright, terminal-protected, and some battery NMFC items have assigned classes regardless of density; check before assuming the density result. And cores (used parts going back for remanufacture) rate like their new equivalents but often travel in cheaper packaging — a drum of loose cores measures worse than the same cores in layered cases.
What affects auto parts freight class
- Metal vs. plastic parts
- Packaging and crating
- Body panels vs. small components
- Palletization
Common auto parts shipments include engine and transmission parts, brakes and rotors, batteries, body panels.
Class guides covering the 60–85 range:
Calculate the freight class for your auto parts
Enter dimensions and weight to get the density-based class for your exact shipment.
Density-based estimate. Some commodities carry a fixed NMFC class — check our freight class by commodity pages.
Estimated Freight Class
Density
32.49
lb/ft³
Volume
53.33
ft³
Weight
1,733
lb
30–35 lb/ft³ → Class 60
Free PDF includes a watermark. Pro removes it & adds your brand.
Estimates only — verify freight class/NMFC and chargeable weight with your carrier.
How freight class is calculated (density scale)
Freight class is set by density = weight (lb) ÷ volume (ft³). Higher density → lower class → typically lower cost. Volume here is L × W × H × quantity.
| Density (lb/ft³) | Class |
|---|---|
| 50+ | 50 |
| 35 – 50 | 55 |
| 30 – 35 | 60 |
| 22.5 – 30 | 65 |
| 15 – 22.5 | 70 |
| 13.5 – 15 | 77.5 |
| 12 – 13.5 | 85 |
| 10.5 – 12 | 92.5 |
| 9 – 10.5 | 100 |
| 8 – 9 | 110 |
| 7 – 8 | 125 |
| 6 – 7 | 150 |
| 5 – 6 | 175 |
| 4 – 5 | 200 |
| 3 – 4 | 250 |
| 2 – 3 | 300 |
| 1 – 2 | 400 |
| 0 – 1 | 500 |
Frequently asked questions
What freight class is auto parts?
Auto Parts typically ships at freight class 60–85. The exact class is set by density — weight divided by volume — so packaging and dimensions can move it within that range.
What affects the freight class of auto parts?
The main factors are metal vs. plastic parts, packaging and crating, body panels vs. small components, palletization. Denser, tightly packed loads rate a lower class and cost less to ship.
How do I find the exact freight class for auto parts?
Measure your shipment and divide weight by volume to get density, then match it to the NMFC scale — the calculator above does this. Confirm the final class and NMFC item number with your carrier before booking.
What freight class are auto parts?
Boxed hard parts (rotors, castings, gears) commonly measure 25–35 lb/ft³ → class 60–65. Light parts (filters, trim, plastic covers) measure 5–8 lb/ft³ → class 125–175. Mixed pallets land between — run the actual blend.
Should I mix heavy and light auto parts on one pallet?
It depends on the ratio: dense-dominant loads usually price better shipped pure with light cartons separate; light-dominant loads improve when dense cases ride inside as ballast. Price both configurations with the calculator before booking.
Do car batteries have a special freight class?
Batteries measure dense, but several battery NMFC items carry assigned classes and carriers impose handling rules (upright, terminals protected). Verify the specific NMFC listing and the carrier's battery requirements rather than relying on density alone.