Diamond Materials LLC
USDOT 45597 · MC-76472 · Wilmington, Delaware · Interstate for-hire carrier · 100–249 power units
Diamond Materials LLC is a corporation based in Wilmington, Delaware, registered with the FMCSA as an interstate carrier (private property, authorized for hire). It reports 139 power units and 117 drivers, which ranks it #10 by fleet size among 19 active for-hire carriers with 50+ power units headquartered in Delaware. In the 24 months to Sep 24, 2026 its trucks were inspected 130 times – about 0.9 inspections per power unit. 8.8% of vehicle inspections and 2.3% of driver inspections ended with an out-of-service order, against 18.8% and 2.6% for carriers of the same size nationally. FMCSA records 9 reportable crashes in the last 24 months (6 injuries, 0 fatalities, 9 tow-away), or 6.5 per 100 power units versus 4.5 for its size band. Crash counts in FMCSA data do not indicate fault. Its registered cargo types are logs, poles, beams, lumber, building materials, machinery, large objects, liquids / gases, garbage / refuse, chemicals, commodities dry bulk, construction.
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Registration and contact
| Legal name | Diamond Materials LLC |
|---|---|
| DBA name | — |
| USDOT number | 45597 |
| Operating authority (docket) | MC-76472 |
| Entity type | Private Property, Authorized for Hire |
| Operation | Interstate |
| Business type | Corporation |
| Physical address | 924 S Heald St, Wilmington, DE 19801 |
| Phone | (302) 658-6524 |
| First registered | Jun 1, 1974 |
| Last MCS-150 update | Jul 2, 2025 |
| Hazmat carrier | Yes |
Check live authority, insurance and out-of-service status: FMCSA SAFER snapshot for USDOT 45597.
Fleet and drivers
| Equipment | Owned | Term-leased | Trip-leased |
|---|---|---|---|
| Straight trucks | 117 | 0 | 0 |
| Truck tractors | 19 | 0 | 0 |
| Trailers | 35 | 0 | 0 |
- 0.84 drivers per power unit (national median for 50+ unit fleets: 0.99).
- 1.8 trailers per tractor.
- 676,737 miles reported for 2025 – about 4,869 miles per power unit vs a 41,613 median for 100–249-unit fleets.
- 100% of listed equipment is owned rather than leased.
- 117 CDL drivers; 0 drivers operate interstate beyond 100 miles, 117 within 100 miles.
Safety record
Roadside inspections Sep 25, 2024 – Sep 24, 2026; crashes Nov 1, 2024 – Oct 31, 2026. Benchmarks: 100–249-unit for-hire carriers nationally (2,611) and Delaware carriers with 50+ units (19).
| Measure | Diamond Materials LLC | Same size, US | DE average | |
|---|---|---|---|---|
| Vehicle out-of-service rate | 8.8% | 18.8% | 12.1% | 53% lower than average |
| Driver out-of-service rate | 2.3% | 2.6% | 2.4% | 12% lower than average |
| Crashes per 100 power units | 6.5 | 4.5 | 2.4 | 44% higher than average |
| Inspections | 130 | 130 with a driver check, 91 with a vehicle check, 58 BASIC violations recorded, 12 hazmat-related | ||
| FMCSA safety rating | Conditional (rated May 26, 1988) | |||
Cargo carried
Less common in this directory: garbage / refuse (557 of 5,000 carriers).
Similar carriers in Delaware
Closest fleet size and cargo mix among Delaware carriers in this directory.
| Carrier | City | Power units | Drivers | Inspections (24 mo) | Vehicle OOS | Crashes (24 mo) |
|---|---|---|---|---|---|---|
| Ameribulk Transport LLC USDOT 663114 | Claymont | 152 | 66 | 86 | 27.6% | 2 |
| Ernest Maier Inc USDOT 230008 | Millsboro | 159 | 56 | 79 | 20.0% | 5 |
| Em Way Inc USDOT 1934741 | Dover | 100 | 50 | 88 | 35.9% | 6 |
| Waste Industries of Delaware Inc USDOT 2141962 | Townsend | 185 | 100 | 52 | 32.1% | 6 |
| Sharpgas Inc USDOT 225304 | Georgetown | 242 | 142 | 85 | 13.8% | 0 |
| Mountaire Farms Inc USDOT 179855 | Selbyville | 252 | 227 | 124 | 11.5% | 13 |
Other carriers near Wilmington
| Carrier | City | Power units | Drivers | Inspections (24 mo) | Vehicle OOS | Crashes (24 mo) |
|---|---|---|---|---|---|---|
| Sentinel Transportation LLC USDOT 613084 | Wilmington | 606 | 530 | 465 | 2.9% | 20 |
| Successor Inc USDOT 3429258 | Wilmington | 504 | 240 | 285 | 25.2% | 14 |
| Aaa Club Alliance Inc USDOT 454703 | Wilmington | 449 | 449 | 40 | 16.7% | 11 |
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FAQ
What is the USDOT number of Diamond Materials LLC?
Diamond Materials LLC is registered with USDOT number 45597 and operating authority MC-76472.
How many trucks does Diamond Materials LLC have?
It reports 139 power units (19 tractors, 117 straight trucks) and 35 trailers, with 117 drivers, on its last MCS-150 update (Jul 2, 2025).
Where is Diamond Materials LLC located?
Its registered physical address is in Wilmington, Delaware 19801.
What is the out-of-service rate of Diamond Materials LLC?
Over 24 months, 8.8% of vehicle inspections and 2.3% of driver inspections resulted in an out-of-service order (same-size national average: 18.8% vehicle, 2.6% driver).
Source: FMCSA Company Census File, SMS inspection file and Crash File (data.transportation.gov), refreshed 2026-11-04. Figures are as reported to FMCSA and may lag. How we calculate these numbers. Spotted an error? Carriers update their record with FMCSA via the MCS-150 form; see corrections.