Diamond Materials LLC
Wilmington, DE
Profile data updated Jul 25, 2026 from official FMCSA records
Trust Score
Mixed
FMCSA data ↓
139
Power Units
117
Drivers
FMCSA since 1974 (52 yrs)
Authority Age
C
Safety Rating
Company Overview
DIAMOND MATERIALS LLC is an active carrier & broker registered with the FMCSA since June 1974. Based in Wilmington, DE, they operate a fleet of 139 power units with 117 CDL drivers. They are classified as Interstate and operate interstate (within 100 miles). Their inferred equipment specializations include Flatbed, Step Deck / RGN, Tanker, Dump Truck, Hopper / Grain, Box Truck and Doubles/Triples.
Equipment Analysis
Based on FMCSA cargo authorization flags and roadside-inspection vehicle records, Diamond Materials LLC operates the following equipment types:
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Fleet Breakdown
| Equipment | Owned | Term Leased | Trip Leased | Total |
|---|---|---|---|---|
| Trucks | 117 | 0 | 0 | 117 |
| Tractors | 19 | 0 | 0 | 19 |
| Trailers | 35 | 0 | 0 | 35 |
Authorized Cargo Types
Diamond Materials LLC is authorized to transport the following 8 cargo types:
Operations Scope
CDL Drivers: 117
MCS-150 Mileage: 676,737 miles (2025)
Driver Information
117
Total Drivers
117
CDL Drivers
117
Interstate Drivers
Vehicles Operated by DIAMOND MATERIALS LLC
75 trucks and 15 trailers identified from FMCSA inspection records. Last update: May 12, 2026.
What this fleet looks like
Top makes on record: Peterbilt, Ford, Western Star. Equipment breakdown: 61 STRAIGHT TRUCK, 14 SEMI-TRAILER, 14 TRUCK TRACTOR. Out-of-service rate is 17.8% — roughly 1 in 5 inspections parks the truck. Fleet data is from FMCSA roadside inspection records (24-month rolling). Trucks that haven't been inspected recently may not appear.
Equipment mix (4 vehicle types)
| Vehicle type | Count | Share |
|---|---|---|
| STRAIGHT TRUCK | 61 | 68% |
| SEMI-TRAILER | 14 | 16% |
| TRUCK TRACTOR | 14 | 16% |
| FULL TRAILER | 1 | 1% |
Trailers (15 on record)
Trailers recorded pulling under this carrier's DOT number in FMCSA roadside inspections. Individual trailer plates and VINs are listed in the plate and vehicle sections above.
| Semi-trailer | 14 |
| Full Trailer | 1 |
| Polar Mfg. | 2 |
| Rclp | 1 |
| Landoll Co | 1 |
| Talbert | 1 |
| Dorsey Tra | 1 |
| East Dump | 1 |
| Polar Tank | 1 |
| Mac Trailer | 1 |
| Utility Trailer | 1 |
| MAC | 1 |
| Trlk | 1 |
| Fontaine | 1 |
| Roge | 1 |
| Trlr | 1 |
Vehicle makes (18 brands on record)
| Make | Vehicles | Share |
|---|---|---|
| Peterbilt | 45 | 50% |
| Ford | 11 | 12% |
| Western Star | 8 | 9% |
| Mack | 5 | 6% |
| Kenworth | 4 | 4% |
| Polar Tank Trailer | 3 | 3% |
| Mac Trailer Manufacturing | 2 | 2% |
| Fontaine Trailer Co. | 2 | 2% |
| Landoll Corporation | 1 | 1% |
| East Manufacturing Corp. | 1 | 1% |
| Isuzu | 1 | 1% |
| Talbert | 1 | 1% |
| Trail King Industries | 1 | 1% |
| Diamond C Trailer Mfg. | 1 | 1% |
| Utility Trailer Manufacturer | 1 | 1% |
| Rogers | 1 | 1% |
| Dorsey | 1 | 1% |
| International | 1 | 1% |
License plates on file (20 shown, most recent first)
| Plate | State | Vehicle | Inspections | Last seen |
|---|---|---|---|---|
| CL121468 | DE | Mack TRUCK TRACTOR | 3 | May 2026 |
| T79261 | DE | Landoll Co SEMI-TRAILER | 2 | May 2026 |
| CL124097 | DE | Western St STRAIGHT TRUCK | 2 | May 2026 |
| CL120814 | DE | Peterbilt STRAIGHT TRUCK | 4 | May 2026 |
| CL120879 | DE | Peterbilt STRAIGHT TRUCK | 3 | May 2026 |
| CL120817 | DE | Peterbilt TRUCK TRACTOR | 3 | May 2026 |
| T78083 | DE | Mac Trailer SEMI-TRAILER | 2 | May 2026 |
| CL117601 | DE | Peterbilt TRUCK TRACTOR | 2 | Apr 2026 |
| T46381 | DE | East Dump SEMI-TRAILER | 1 | Apr 2026 |
| CL120882 | DE | Peterbilt STRAIGHT TRUCK | 2 | Apr 2026 |
| CL120881 | DE | Peterbilt STRAIGHT TRUCK | 1 | Apr 2026 |
| T48125 | DE | Polar Tank SEMI-TRAILER | 2 | Apr 2026 |
| CL117649 | DE | Peterbilt STRAIGHT TRUCK | 3 | Mar 2026 |
| E56592D | MD | Peterbilt TRUCK TRACTOR | 3 | Mar 2026 |
| E56606D | MD | Peterbilt STRAIGHT TRUCK | 3 | Mar 2026 |
| E56598D | MD | Peterbilt STRAIGHT TRUCK | 3 | Mar 2026 |
| CL117685 | DE | Peterbilt STRAIGHT TRUCK | 1 | Mar 2026 |
| CL124096 | DE | Western St STRAIGHT TRUCK | 1 | Mar 2026 |
| CL117816 | DE | Peterbilt STRAIGHT TRUCK | 4 | Feb 2026 |
| CL123842 | DE | Wctr STRAIGHT TRUCK | 5 | Feb 2026 |
Plate registrations span 5 states: DE (82) · MD (5) · NJ (1) · PA (1) · IN (1)
Recent active vehicles (12 shown of 90)
Showing the most recently active 12 vehicles. Full fleet records are available via direct VIN search.
Fleet data is aggregated from FMCSA roadside inspection records (24-month rolling window). Vehicles inspected under this carrier's DOT number are listed. A VIN can appear under multiple carriers over its lifetime if leased, sold, or operated by different fleets at different times. Recall status is VIN-specific — use the NHTSA recall lookup linked on each vehicle above to see whether a given VIN has open (unremedied) recalls, or verify with the OEM dealer.
Dispatch Services in DE
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Verify on Official Sources
Cross-reference this carrier's data with official FMCSA systems:
Safety Performance
Good
Below national average OOS rates
O Trucking Safety Grade
132
Inspections
24 months
79
Violations
Total found
17
Out of Service
Orders issued
Out-of-Service Rates vs National Average
✓ Better than national average (-4.5%)
✓ Better than national average (-11.9%)
| Date | State | Level | Violations | OOS |
|---|---|---|---|---|
| 07/22/2026 | DE | Walk-Around | 0 | ✓ |
| 07/17/2026 | DE | Walk-Around | 1 | ✓ |
| 07/15/2026 | NJ | Walk-Around | 1 | ✓ |
| 07/10/2026 | MD | Walk-Around | 5 | 3 |
| 07/01/2026 | MD | Walk-Around | 0 | ✓ |
| 06/30/2026 | NJ | Walk-Around | 0 | ✓ |
| 06/30/2026 | NJ | Driver Only | 0 | ✓ |
| 06/30/2026 | MD | Walk-Around | 0 | ✓ |
| 06/25/2026 | DE | Walk-Around | 1 | ✓ |
| 06/17/2026 | MD | Walk-Around | 0 | ✓ |
| 06/16/2026 | MD | Walk-Around | 0 | ✓ |
| 06/16/2026 | MD | Walk-Around | 0 | ✓ |
| 06/15/2026 | DE | Driver Only | 1 | ✓ |
| 06/11/2026 | MD | Walk-Around | 0 | ✓ |
| 06/05/2026 | MD | Full | 1 | ✓ |
Showing 15 of 132 inspections.
Inspection data from FMCSA (24-month window). Updated daily. View full inspection history on FMCSA →
Violation Breakdown
Crash History
9
Total Crashes
0
Fatalities
6
Injuries
9
Tow-Aways
9 FMCSA-recordable
| Date | State | Location | Fatal | Injuries | Tow |
|---|---|---|---|---|---|
| 04/20/2026 | MD | NORTH EAST, MD | 0 | 0 | Yes |
| 04/13/2026 | NJ | QUINTON TWP, NJ | 0 | 0 | Yes |
| 08/27/2025 | MD | ELKTON, MD | 0 | 0 | Yes |
| 06/09/2025 | DE | NEWPORT, DE | 0 | 2 | Yes |
| 04/24/2025 | NJ | ELK TWP, NJ | 0 | 1 | Yes |
| 02/18/2025 | NJ | UPPER PITTSGROVE TWP, NJ | 0 | 1 | Yes |
| 02/18/2025 | NJ | HAMILTON TWP, NJ | 0 | 0 | Yes |
| 11/12/2024 | DE | MIDDLETOWN, DE | 0 | 1 | Yes |
| 11/12/2024 | PA | STRASBURG TOWNSHIP, PA | 0 | 1 | Yes |
Crash data from FMCSA. Does not include driver information per federal privacy requirements. View full crash report on FMCSA →
Is Diamond Materials LLC Legitimate? Safety & Fraud Check
A quick, plain-English check of whether this carrier looks safe and legitimate to hire — based on public FMCSA and U.S. Treasury records. It's a screening aid, not a guarantee; always confirm on the official FMCSA SAFER site.
These checks use public U.S. government records — the carrier's license status, safety-inspection and crash history, ownership links, and the U.S. Treasury sanctions list — refreshed automatically. A flag doesn't prove wrongdoing; it's a prompt to verify before you do business.
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Frequently Asked Questions
What equipment does DIAMOND MATERIALS LLC operate?
Based on their FMCSA cargo classifications and fleet data, DIAMOND MATERIALS LLC is inferred to operate: Flatbed, Step Deck / RGN, Tanker, Dump Truck, Hopper / Grain, Box Truck and Doubles/Triples.
Is DIAMOND MATERIALS LLC's authority currently active?
DIAMOND MATERIALS LLC currently holds active operating authority with the FMCSA.
How long has DIAMOND MATERIALS LLC been in business?
DIAMOND MATERIALS LLC has been registered with the FMCSA since June 1974, making their authority approximately 52 years, 1 month old.
Where is DIAMOND MATERIALS LLC located?
DIAMOND MATERIALS LLC is physically located at 924 S HEALD ST, WILMINGTON, DE 19801.
Roadside Inspection History 132 records
Individual inspections from FMCSA Motor Carrier Management Information System (MCMIS). Last 24 months. Updated monthly.
What this means
DIAMOND MATERIALS LLC has been inspected 132 times by state troopers and DOT inspectors in the past 24 months. Most inspections happened in NJ, MD, DE. Out of these, 12 inspections (about 9%) resulted in an out-of-service order — meaning the truck or driver was held until a violation was fixed. The national average vehicle out-of-service rate is roughly 21%. The most frequently cited violation is 393.75A3-TAOL — 6 times in this window.
| Date | State | Level | Violations | OOS |
|---|---|---|---|---|
| 2026-07-22 | DE | Level 2 · Walk-around | 0 | — |
| 2026-07-17 | DE | Level 2 · Walk-around | 1 | — |
| 2026-07-15 | NJ | Level 2 · Walk-around | 1 | — |
| 2026-07-10 | MD | Level 2 · Walk-around | 5 | OOS · 3 |
| 2026-07-01 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-30 | NJ | Level 2 · Walk-around | 0 | — |
| 2026-06-30 | NJ | Level 3 · Driver-only | 0 | — |
| 2026-06-30 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-25 | DE | Level 2 · Walk-around | 1 | — |
| 2026-06-17 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-16 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-16 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-15 | DE | Level 3 · Driver-only | 1 | — |
| 2026-06-11 | MD | Level 2 · Walk-around | 0 | — |
| 2026-06-05 | MD | Level 1 · North American Standard (full) | 1 | — |
| 2026-06-02 | NJ | Level 1 · North American Standard (full) | 0 | — |
| 2026-06-01 | NJ | Level 2 · Walk-around | 0 | — |
| 2026-05-26 | NJ | Level 2 · Walk-around | 0 | — |
| 2026-05-15 | NJ | Level 2 · Walk-around | 0 | — |
| 2026-05-12 | NJ | Level 3 · Driver-only | 0 | — |
| 2026-05-11 | DE | Level 3 · Driver-only | 0 | — |
| 2026-05-08 | NJ | Level 3 · Driver-only | 0 | — |
| 2026-05-06 | NJ | Level 2 · Walk-around | 0 | — |
| 2026-05-06 | DE | Level 3 · Driver-only | 0 | — |
| 2026-05-04 | MD | Level 2 · Walk-around | 2 | OOS · 2 |
Showing 25 of 132 inspections. View full history →
Most-Cited Violations
Top 10 violation types across this carrier's roadside inspections. Cards in red triggered an out-of-service order — the most serious outcome.
Roadside Violation Profile
Across FMCSA roadside inspections (rolling 24 months), DIAMOND MATERIALS LLC was cited for 49 violations, of which 16 (33%) placed a driver or vehicle out of service.
| BASIC category | Violations | Out-of-service |
|---|---|---|
| Vehicle Maintenance | 32 | 12 |
| Unsafe Driving | 11 | 0 |
| Driver Fitness | 6 | 4 |
Source: FMCSA roadside-inspection violation records (rolling 24-month summary). Counts reflect citations across all inspections under this carrier's DOT number; see Inspection History for individual inspection events. Violation severity and CSA percentile scores are shown in the Safety & Compliance section.
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Carrier History & Continuity
Research signals that connect this carrier to other USDOT entities — useful for shippers, brokers, and insurers performing due diligence.
Other USDOT Registrations Sharing Officer Names (2)
Officer names listed on this carrier's MCS-150 also appear on the following USDOT registrations in FMCSA's public database. Common names may match unrelated individuals; this is a research starting point, not an accusation. Always verify directly with FMCSA before drawing conclusions.
Other Carriers Registered at This Address (1)
These carriers list the same physical street, city, and state in FMCSA's public database. Shared addresses commonly reflect legitimate co-located businesses, multi-fleet owners, or registered-agent services. Always verify directly with FMCSA before drawing conclusions.
About this data: All entries above come from FMCSA's public USDOT registry (MCS-150 filings). We surface name and address overlaps so shippers, brokers, and insurers can perform their own due diligence. The presence of an entry here does not imply wrongdoing by any party.
For background on FMCSA's chameleon-carrier risk-based vetting program: FMCSA methodology →
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