Navigating NMFC 133300 for Machinery
For industrial equipment sellers and machinsts, shipping a CNC machine is a major logistical hurdle. Unlike standard retail goods, heavy machinery falls under strict NMFC (National Motor Freight Classification) 133300 rules. While CNC machines are inherently heavy, their freight class is determined not just by weight, but by how much space they occupy in a trailer. This makes "crating density" the most important factor in your final shipping quote.
Density Savings
By building a precision custom crate, you can maximize your Pounds per Cubic Foot (PCF). Many CNC shipments can be lowered from Class 125 down to Class 85 simply by tightening the dimensions and increasing density.
Protection & Liability
A fully-enclosed wooden crate reduces the carrier's risk of damage to sensitive electronics. Carriers reward lower-risk profile freight with better rates and fewer re-classification audits.
The Financial Impact of Crating
If you ship a CNC machine on an open pallet, the carrier's automated dimensioner will record the maximum width and height (including protruding tool changers or handles). This "opaque" volume lowers your density significantly. However, if you crate the machine, the dimensioner records the flat edge of the crate, resulting in a superior PCF. On a 2,500lb machine, shifting from Class 125 to Class 85 can reduce your shipping cost by $400 - $700 per shipment.
CNC Shipping Best Practices
- Extreme Dimension Check: Measure the crate to the absolute farthest point. A single protruding bolt can trigger a volume recalculation.
- Internal Bracing: Secure the machine bed and spindle to prevent shifting inside the crate, which can alter the center of gravity.
- Density Verification: Use our calculator to prove your PCF before you generate the BOL to discourage carrier re-bills.
Calculate Your CNC Density Now
Don't guess your freight class. Enter your machine dimensions below and see exactly how much you can save by crating for density.
Calculate Density ⟶