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Diamond Materials Llc (DOT# 45597 · MC# 76472) – FMCSA Carrier Profile

DOT# 45597MC# 76472● Active
Updated monthly · 2026-03-09

This carrier is active with a Conditional safety rating — some safety deficiencies were noted.

Diamond Materials Llc is a registered motor carrier with the FMCSA under USDOT number 45597. The company operates from Wilmington, DE and maintains an active operating status with 139 power units and 117 drivers on record.

Safety Rating

FMCSA Safety Rating
⚠ Conditional
Rated: May 26, 1988

Diamond Materials Llc holds a "Conditional" safety rating from the Federal Motor Carrier Safety Administration (FMCSA). This rating indicates that some safety deficiencies were found during the most recent compliance review conducted by FMCSA. View official FMCSA record →

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Company Information

Address924 S Heald St, Wilmington, DE, 19801
Phone(302) 658-6524
EmaildiamondMATERIALS@DIAMONDMATERIALS.COM
Entity TypePrivate Property
OperationInterstate
Power Units139(Large carrier)
Drivers117
MCS-150 FiledJuly 2, 2025
Annual Mileage676,737 mi (2025)
All carriers in Delaware→Carriers in Wilmington, DE→

Inspection Summary

All-time Inspections
All-time
110
Total
10
OOS
3
Driver OOS
7
Vehicle OOS
110 inspections indicates a high-volume, actively operating carrier.
OOS Rate9.09%
The out-of-service (OOS) rate represents the percentage of inspections that resulted in the carrier being placed out of service. 9.1% — below the national vehicle OOS average of ~21%.

Crash History

Crash Records
All-time
6
Total
0
Fatal
4
Injuries
0
Tow-Away
6 crashes on record. This is within a common range for active carriers — assess relative to fleet size and inspection volume.

BASICS Safety Scores

BASICS Scores
Higher = more risk · FMCSA Behavior Analysis and Safety Improvement Categories
0.7
Unsafe Driving
Measures violations related to speeding, reckless driving, and improper lane changes.
0.0
HOS Compliance
Tracks hours-of-service violations, including driving beyond legal limits without rest.
0.3
Driver Fitness
Reflects issues with driver qualifications, licenses, and medical certifications.
0.0
Controlled Substances
Captures drug and alcohol violations, including failed or refused tests.
1.0
Vehicle Maintenance
Reflects brake, tire, lighting, and other equipment-related inspection violations.
Scores above 65 (general freight) or 50 (passenger/hazmat) trigger an FMCSA Alert. Higher scores indicate more safety risk. National median is approximately 20–30 for active carriers.
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Carrier Insight

Diamond Materials Llc is a large motor carrier operating in Delaware. With 110 total inspections on record, the carrier has an out-of-service rate of 9.1%, which is below the national average of approximately 21%. 6 crashes have been reported. Review crash details alongside fleet size and inspection history before making hiring decisions.

A Conditional rating from the FMCSA indicates that Diamond Materials Llc has some safety deficiencies that need to be addressed. Shippers and brokers should review the BASICS scores carefully.

The company operates 139 power units and employs 117 drivers. This fleet size places it among the larger carriers in the FMCSA registry.

Frequently Asked Questions

What is USDOT Number 45597?
USDOT number 45597 is assigned to Diamond Materials Llc, an active motor carrier registered with the FMCSA, based in Wilmington, DE.
What is the safety rating of Diamond Materials Llc?
Diamond Materials Llc has a safety rating of Conditional as of May 26, 1988.
How many inspections has Diamond Materials Llc had?
Diamond Materials Llc has recorded 110 total inspections with 10 out-of-service orders, representing an OOS rate of 9.09%.
Where is Diamond Materials Llc located?
Diamond Materials Llc is headquartered at 924 S Heald St, Wilmington, DE 19801.
What does "Not Rated" mean?
"Not Rated" means the FMCSA has not conducted a formal compliance review for this carrier. It does not indicate a safety problem — many active carriers operate without a formal rating.
Is zero crashes always a good sign?
Generally yes, but context matters. A carrier with zero crashes and very few inspections may simply have limited road exposure. Always review crash data alongside inspection volume and fleet size.
What is a normal OOS rate?
The national average vehicle out-of-service rate is approximately 21%. Driver OOS averages around 5%. Rates significantly above these thresholds may indicate recurring compliance issues.
How often is FMCSA data updated?
FMCSA publishes updated carrier data monthly. This page reflects the most recent available snapshot, updated on the date shown above.
What is the MC number for Diamond Materials Llc?
The MC number for Diamond Materials Llc is MC# 76472. The MC number is issued by the FMCSA and authorizes carriers to operate in interstate commerce.

Data sourced from the FMCSA Open Data Portal. Updated monthly. DOT# 45597 · Last updated: 2026-03-09. View official FMCSA record →