DIAMOND TRUCKING INC
AUTHORIZEDUSDOT
491637
MC Number
240905
Fleet Size
76
Total Drivers
81
Last updated: March 11, 2026
Safety overview
DIAMOND TRUCKING INC is a mid-size interstate motor carrier based in PHOENIX, Arizona, operating 76 power units with 81 drivers. Their safety profile raises flags: 4 of 5 BASIC categories exceed the 75th percentile, which is where FMCSA considers stepping in. Their driver out-of-service rate of 0.0% comes in under the 5.51% national average. They have 7 crashes on file (2 with injuries). FMCSA records show 156 inspections for this carrier.
BASIC scores
SMS PercentilesHigher percentile = worse performance relative to peers. Scores at or above 75% may trigger an FMCSA investigation.
Out-of-service rates vs. national average
An out-of-service order means the driver or vehicle was pulled from operation during a roadside inspection.
For reference, the average driver OOS rate in Arizona is 12.4% and the average vehicle OOS rate is 26.7% across 29,008 carriers.
Company details
- Entity Type
- N/A
- Carrier Operation
- Interstate
- Operation Classification
- Authorized For Hire
- Cargo Carried
- N
- Hazmat
- Yes
- Safety Rating Date
- N/A
What are BASIC scores?
FMCSA tracks carrier performance through its Safety Measurement System (SMS), which scores carriers across six categories called BASICs. Each score is a percentile from 0 to 100, based on inspection and crash data from the past 24 months.
A score of 65 means the carrier performed worse than 65% of its peers. Anything above 75% can trigger FMCSA alerts or investigations. Brokers vetting new carriers should pay attention to scores above 50%.
- Unsafe driving
- Speeding, reckless driving, improper lane changes, seatbelt violations. All based on what officers find during roadside inspections.
- HOS / Fatigue
- Hours-of-service violations, logbook problems, driving past the allowed limits. Fatigued driving is one of the top causes of truck crashes in the US.
- Driver fitness
- Licensing problems, expired medical certificates, and other driver qualification issues.
- Controlled substances
- Drug and alcohol testing violations, possession, or impairment.
- Vehicle maintenance
- Brake problems, tire issues, lighting defects, load securement failures. Caught during the vehicle portion of roadside inspections.
- Crash indicator
- Based on crash history from state-reported data. Higher percentile means more crashes relative to the carrier's size and mileage.
Inspections
156
Total
51%
Driver %
Crash history
7
Total Crashes
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Frequently asked questions
Is DIAMOND TRUCKING INC authorized to operate?
Yes. DIAMOND TRUCKING INC (USDOT #491637) currently holds "AUTHORIZED" status with FMCSA. They're registered as an interstate carrier.
What is DIAMOND TRUCKING INC's safety record?
DIAMOND TRUCKING INC has 4 BASIC scores above the 75th percentile, which is where FMCSA may look into a carrier. Brokers should weigh these scores alongside the inspection history and crash data before making a decision.
How many trucks does DIAMOND TRUCKING INC operate?
DIAMOND TRUCKING INC operates 76 power units with 81 drivers on file. That puts them in the mid-size range.
Does DIAMOND TRUCKING INC transport hazardous materials?
Yes. DIAMOND TRUCKING INC is flagged for hazardous materials transportation with FMCSA. That means additional safety requirements and more frequent inspections.
Where is DIAMOND TRUCKING INC located?
DIAMOND TRUCKING INC is based in PHOENIX, Arizona at 5701 W VAN BUREN ST, 85043. Phone: (602) 278-7399.
What are DIAMOND TRUCKING INC's out-of-service rates?
DIAMOND TRUCKING INC's driver out-of-service rate is 0.0%, compared to the national average of 5.51%. Below average, which is a good sign. Their vehicle out-of-service rate is 0.7% (national average: 20.72%). Below average, suggesting the fleet is well-maintained.