Diamond Materials Llc is an active interstate carrier based in Wilmington, DE.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 117 | 0 | 0 |
| Tractors | 19 | 0 | 0 |
| Trailers | 35 | 0 | 0 |
| Total Power Units | 139 | ||
Distinct vehicles · 24 mo
vs 139 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category | Insp w/ Viol |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 56% | 85% | Around peer average |
| HOS Compliance | 0% | 0% | Better than most peers |
| Driver Fitness | 100% | 89% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 33% | 78% | Around peer average |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 4 | — | 6.67% |
| Vehicle | 0 | 8 | — | 22.26% |
| Hazmat | 4 | 0 | 0.00% |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Jul 1, 2025 | 0 | 0 | 1 | 1 |
| Apr 1, 2025 | 0 | 3 | 2 | 2 |
| Jan 1, 2025 | 0 | 1 | 2 | 2 |
| Oct 1, 2024 | 0 | 2 | 2 | 2 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 28 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Mar 13, 2026 | MD | STRAIGHT TRUCK | 1 | 1 |
| Mar 9, 2026 | MD | STRAIGHT TRUCK | 0 | 0 |
| Mar 9, 2026 | MD | STRAIGHT TRUCK | 3 | 1 |
| Mar 9, 2026 | MD | STRAIGHT TRUCK | 2 |
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 9 | 0.62 | — |
| HOS Compliance | 0 | 0.00 | — |
| Vehicle Maintenance | 20 | 1.53 | — |
| Driver Fitness | 5 | 0.35 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 4 states. Top state NJ accounts for 55% of activity. Activity outside home state (DE): 80%.
| 4 |
| 10 |
| Unsafe Driving | 9 | 4 | 0 |
| Driver Fitness | 6 | 2 | 4 |
| Mar 6, 2026 | MD | STRAIGHT TRUCK | 0 | 0 |
| Feb 27, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Feb 27, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Feb 19, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Feb 19, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Feb 19, 2026 | NJ | STRAIGHT TRUCK | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Mar 13, 2026 | 38351ASOUT | Driving a CMV while CDL is suspended for safety-related or unknown reason and outside the state of driver's license issuance | Driver Fitness | Yes |
| Mar 9, 2026 | 39347E | Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt | Vehicle Maintenance | — |
| Mar 9, 2026 | 39353BB | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | — |
| Mar 9, 2026 | 3963A1BOS | Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Vehicle Maintenance | Yes |
| Mar 9, 2026 | 39375A3TAOL | Tires - All others leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS | Vehicle Maintenance | Yes |
| Mar 9, 2026 | 3963A1BALAC | Brake - Audible air leak from a brake chamber | Vehicle Maintenance | — |
| Jan 14, 2026 | 39375A3TAOL | Tires - All others leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS | Vehicle Maintenance | Yes |
| Dec 24, 2025 | 3922SLLS3 | State/Local Laws - Speeding 11-14 miles per hour over the speed limit | Unsafe Driving | — |
| Dec 22, 2025 | 39395F | Emergency Equipment - Stopped vehicle warning devices missing or improper | Vehicle Maintenance | — |
| Nov 28, 2025 | 38325A1 | Learner's Permit (CLP) - Is not accompanied by the holder of a valid CDL that is fully authorized to operate the CMV. | Driver Fitness | Yes |