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Freight Carrier · Wilmington, DE

DIAMOND MATERIALS LLC

924 S HEALD ST · Wilmington, DE 19801

AUTHORIZED FOR:
(302) 658-6524 Tap to call
  • MC #76472
  • USDOT #45597 USDOT Active
  • 139
    Power Units
  • 117
    Drivers
  • Carrier
    Entity Type

About this carrier

DIAMOND MATERIALS LLC is a Wilmington, DE freight carrier that is authorized for: in the state of Delaware. This company has 139 truck(s) in their fleet and 117 truck drivers. Their motor carrier number is MC-76472 and their USDOT number is 45597.

Sourced from FMCSA SAFER · last filed 07/02/2025 · last updated Aug 22, 2026.

Carrier Details

  • Operating Status AUTHORIZED FOR:
  • MCS-150 Filed 07/02/2025
  • MCS-150 Mileage 676,737 (2025)

Authority & Operations

Operation Classification
  • Authorized for Hire
  • Private (Property)
Carrier Operation
  • Interstate

Cargo Authorized

  • Logs, Poles, Beams, Lumber
  • Machinery, Large Objects
  • Liquids/Gases
  • Garbage/Refuse
  • Chemicals
  • Commodities Dry Bulk
  • Construction

Operating Territory

Map of states where this carrier has roadside inspections New Jersey — 70 inspections (past 24 months) Maryland — 31 inspections (past 24 months) Maryland — 31 inspections (past 24 months) Delaware — 29 inspections (past 24 months) Pennsylvania — 1 inspection (past 24 months)

Inspection activity   Inspected in 4 states over the past 24 months: NJ (70), MD (31), DE (29), PA (1). Home base: Wilmington, Delaware.

Safety Record

13 Severe Violations Updated Sep 2, 2026

Crashes (24 mo)

  • 0
    Fatal
  • 5
    Injury
  • 4
    Tow
  • 9
    Total

Behavior Categories (BASICs)

CategoryMeasureViolations Unsafe Driving 0.79 12 Crash Indicator Not Public — Hours of Service 0 0 Vehicle Maintenance 1.65 22 Drugs / Alcohol 0 0 Hazmat Not Public — Driver Fitness 0.23 5

Inspection Summary

  • 131
    Total
  • 93
    Clean
  • 38
    With violations

24-month window ending Jul 31, 2026

Violations Cited 37 unique codes

Critical 14

  • 392.2-SLLS4State/Local Laws - Speeding 15 or more miles per hour over the speed limit1× SW 10
  • 393.75A3-TAOLTires - All others, leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS5× OOS×5 SW 8
  • 383.23(a)(2)Operating a CMV without a CDL1× OOS×1 SW 8
  • 383.25A1Learner's Permit (CLP) - Is not accompanied by the holder of a valid CDL that is fully authorized to operate the CMV.1× OOS×1 SW 8
  • 393.75A4-PBMETires - Has a cut to the extent that the ply or belt material is exposed.1× SW 8
  • 383.51A-SOUTDriving a CMV while CDL is suspended for safety-related or unknown reason and outside the state of driver's license issuance1× OOS×1 SW 5
  • 393.45D-BHTBSAir Brake - Hose/tubing with a bulge/swelling when air pressure is applied1× OOS×1 SW 4
  • 393.45B2-BHTDAir Brake - Hose/tubing damage into the outer reinforcement ply.1× OOS×1 SW 4
  • 393.43No/improper breakaway or emergency braking1× OOS×1 SW 4
  • 393.41-BNPBBrake - Inoperative or missing parking brake on power unit1× OOS×1 SW 4
  • 393.75G-TAOWTires - All others, weight carried exceeds tire load limit1× OOS×1 SW 3
  • 393.9Inoperable Required Lamp1× OOS×1 SW 2
  • 391.41APCMedical (Certificate) - Operating a property-carrying vehicle without a valid medical certificate in possession or on file with the state drivers licensing agency when medical certification is required.1× OOS×1 SW 1
  • 396.3(a)1BOSBrake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination1× OOS×1 SW 0

Unsafe Driving 5

  • 392.2-SLLS3State/Local Laws - Speeding 11-14 miles per hour over the speed limit4× SW 7
  • 392.2-SLLTCDState/Local Laws - Failed to obey a traffic control device - Permanent or Temporary - e.g., safety official, signal, sign, light, lane marking, other2× SW 5
  • 392.2CFailure to obey traffic control device1× SW 5
  • 392.2-SLLS2State/Local Laws - Speeding 6-10 miles per hour over the speed limit3× SW 4
  • 392.2SLTRSState/Local Laws - Truck routing restriction1× SW 3

Vehicle Maintenance 16

  • 393.9A-LHLILighting - Headlamp(s) - Any inoperative1× SW 6
  • 393.45B2-BAir brake - Hose/tubing damaged or not secured1× SW 4
  • 396.3A1-BALACBrake - Audible air leak from a brake chamber1× SW 4
  • 393.45D-BAir Brake - Audible air leak at a proper connection1× SW 4
  • 393.47(e)Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt1× SW 4
  • 393.48A-BLMACBDDrum Brake - Loose chamber/spider/camshaft support bracket1× SW 4
  • 393.53B-BAir Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear1× SW 4
  • 396.5B-LLubrication - Oil or grease leak1× SW 3
  • 393.30-BBattery - Not protected1× SW 3
  • 393.95(f)Emergency Equipment - Stopped vehicle warning devices missing or improper5× SW 2
  • 393.95A1Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated.2× SW 2
  • 393.95A4-EEUSEmergency Equipment - Fire Extinguishers - unsecured1× SW 2
  • 392.8-DDriver - Failed to inspect /use emergency equipment1× SW 2
  • 393.11A1-LLPLLighting - License plate lamp missing1× SW 2
  • 393.78Wipers - Inoperative / missing / damaged wipers1× SW 1
  • 393.78A-WSWashers - Inoperative washing system.1× SW 1

Driver Fitness 2

  • 383.71HLicense (CDL) - CDL or CLP holder possesses a valid medical certificate but is not on file with the issuing state driver's licensing agency as required1× SW 1
  • 391.41A-MCPCMedical (Certificate) - Operating a commercial motor vehicle without showing proof of a valid medical certification upon request, but presents proof prior to completion of inspection.1× SW 1

Locations

Physical Address
DIAMOND MATERIALS LLC
924 S HEALD ST
WILMINGTON, DE 19801
Mailing Address
DIAMOND MATERIALS LLC
242 N JAMES ST SUITE 102
NEWPORT, DE 19804

Location on Map

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Related Companies

Other entries in the FMCSA database that share data with this carrier — name, phone, or address overlap. Worth a closer look during vetting.

Same phone number 1

These carriers list the same contact phone number.

CompanyStatusPower UnitsDriversMC#USDOT#
TRI COUNTY MATERIALS LLC
Newport, DE
USDOT Active AUTHORIZED FOR:5515206904027454

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