PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 4-256-01
4-256-01 ✓ Verified by PartsTable
— · PSU
WHAT YOU NEED TO KNOW
Always quote matching pair — mixed wattage causes throttling Platinum/Titanium = higher efficiency = lower power cost over time
AC or DC input? Verify customer site power
PRODUCT OVERVIEW

The POWER SUPPLY is a the manufacturer power supply unit built for continuous operation in enterprise server and storage platforms. Key specifications include material: STEEL COMP 1010 OR STEEL COMP 1020 OR STEEL COMP 1050 OVERALL, head_style: HEXAGON, head_height: 0.270 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN, thread_class: 2A A, overall_width: 2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN, thread_length: 0.886 INCHES MINIMUM AND 0.969 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-042-5601, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
4-256-01
NSN: 5305-00-042-5601
FSC: 5305
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 1020 OR STEEL COMP 1050 OVERALL
head_styleHEXAGON
head_height0.270 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN
thread_class2A A
overall_width2.430 INCHES MINIMUM AND 2.450 INCHES MAXIMUM IN
thread_length0.886 INCHES MINIMUM AND 0.969 INCHES MAXIMUM IN
overall_length3.800 INCHES MINIMUM AND 3.820 INCHES MAXIMUM IN
fastener_length0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
washer_quantity1
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
NSN5305-00-042-5601
COMPONENT DIAGRAM
PULL TAB AIRFLOW —W PLATINUM 100-240V~ 50/60Hz OEM BACKPLANE CONN ~200 mm HOT-PLUG POWER SUPPLY | —W | Platinum AC input 100-240V | Redundant pair required | Match wattage in same chassis TITLE PSU —W PN 4-256-01 MFR OEM Platinum
KEY FEATURES
•
PRIMARY WASHER OUTSIDE DIAMETER: 0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
WASHER QUANTITY: 1
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
FASTENER LENGTH: 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 24
•
PRIMARY WASHER STYLE: FLAT EXTERNAL TEETH
TYPICAL APPLICATIONS
  • Server power supply replacement (failed or degraded)
  • Redundant power upgrade for high-availability
  • Power capacity upgrade for GPU or expansion configurations
  • Hot-swap power maintenance in production environments
  • Spare inventory for break-fix operations
TECHNICAL CHARACTERISTICS (FLIS)
PRIMARY WASHER OUTSIDE DIAMETER0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
WASHER QUANTITY1
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF
FASTENER LENGTH0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
PRIMARY WASHER STYLEFLAT EXTERNAL TEETH
THREAD LENGTH0.886 INCHES MINIMUM AND 0.969 INCHES MAXIMUM IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
M213-10EInterchangeable
interchangeable cross-reference
interchangeable
PS74029-1Interchangeable
interchangeable cross-reference
interchangeable
13067Interchangeable
interchangeable cross-reference
interchangeable
5305000425601Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy 4-256-01?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 4-256-01?
4-256-01 is a POWER SUPPLY.
What parts can replace 4-256-01?
There are 4 known substitutes for 4-256-01: M213-10E, PS74029-1, 13067 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-256-01?
4-256-01 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-042-5601. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 4-256-01

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026