NMFC 37710 - Door Sills/Thresholds | Class 55

To find the correct freight class for your shipment:

1. Use fiberboard cartons stamped 150# burst (Mullen) or stronger, and add internal blocking so wood sills don’t shift or crush in transit.
2. Strap cartons to a pallet with edge protectors; keep cartons flush to the pallet to avoid overhang that can trigger handling damage or OS charges.
3. Record exact scale weight and piece count; this item is weight-rated at Class 55, so precise weight drives accurate LTL quotes and bills.
4. Note the NMFC reference (item note 37504) on paperwork if applicable, and keep overall lengths under 96 inches when possible to avoid oversize fees.

Note: All classifications are subject to Item 170. Verify with official NMFC publications for the most current requirements.

• Lower fixed Class 55 often yields better LTL rates compared to higher classes, reducing landed cost on millwork shipments.
• Packaging to the 150‑lb test standard helps prevent carrier reclassifications and inspection fees tied to noncompliant cartons.
• Weight-based rating simplifies quoting and audit—no density calculations—cutting admin time and billing disputes.
• Non-hazardous status streamlines booking and lowers risk of special handling charges, improving on-time delivery performance.