PartsTable
Technical Data Sheet
PartsTable / STORAGE_HDD / MIL-U-18250
MIL-U-18250 ✓ Verified by PartsTable
— · STORAGE_HDD · 2.5_SAS_HDD
WHAT YOU NEED TO KNOW
SAS backplane supports SATA, not vice versa NL-SAS = SAS protocol at nearline (7.2K) speed — NOT SATA
Gen8 LFF tray ≠ Gen10 tray — different screw holes
PRODUCT OVERVIEW

IBM 428GB 15K RPM SAS Disk Drive 3.5 (IBM i). Key specifications include material: IRON OR IRON ALLOY BODY, seat_type: GROUND-JOINTGROUND-JOINT, connection_type: THREADED INTERNAL PIPE ALL ENDSTHREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDSPLAIN (PIPE) ALL ENDS, style_designator: THREADED, surface_treatment: ZINC BODY. The unit ships in a LFF form factor suitable for standard rack-mount installations.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-189-2598, 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
STORAGE_HDD→ 2.5_SAS_HDD→ LFF BAY→ MIL-U-18250
NSN: 4730-00-189-2598
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialIRON OR IRON ALLOY BODY
seat_typeGROUND-JOINTGROUND-JOINT
connection_typeTHREADED INTERNAL PIPE ALL ENDSTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDSPLAIN (PIPE) ALL ENDS
style_designatorTHREADED
surface_treatmentZINC BODY
operating_pressure300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
nominal_thread_size1.250 INCHES ALL ENDS1.250 INCHES ALL ENDS IN
maximum_operating_temp500.0 FAHRENHEIT SINGLE RESPONSE500.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length2.810 INCHES IN
media_for_which_designedWATER-OIL-GAS SECOND RESPONSE
thread_series_designatorNPT ALL ENDS
NSN4730-00-189-2598
COMPONENT DIAGRAM
RELEASE LATCH 428GB NL-SAS 15K RPM MIL-U-18250 OEM NL-SAS INTERFACE INTERPOSER SAS drive in SATA tray? Check board compatibility 3.5" (101.6 x 146mm) LFF 3.5" DRIVE | 428GB | NL-SAS 15K RPM NL-SAS uses SAS protocol at 7.2K RPM | SAS backplane supports SATA, not reverse Tray generation matters | Gen8 LFF tray differs from Gen10 TITLE LFF 3.5" DRIVE PN MIL-U-18250 MFR OEM
KEY FEATURES
•
LFF Form Factor
•
428GB Capacity
•
15K RPM Speed
•
NONDEFINITIVE SPEC/STD DATA: XA TYPE
•
STYLE DESIGNATOR: SCREWED
•
MEDIA FOR WHICH DESIGNED: STEAM SINGLE RESPONSE
•
OPERATING PRESSURE: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.750 INCHES ALL ENDS IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OVERALL
•
NOMINAL OVERALL LENGTH: 2.094 INCHES IN
TYPICAL APPLICATIONS
  • Enterprise storage arrays and SANs
  • Direct-attached storage (DAS) expansion
  • Database tier storage (OLTP, OLAP)
  • Virtual machine datastore expansion
  • Backup-to-disk and disaster recovery targets
  • Content delivery and media streaming storage
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATAXA TYPE
STYLE DESIGNATORSCREWED
MEDIA FOR WHICH DESIGNEDSTEAM SINGLE RESPONSE
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
STYLE DESIGNATORSCREWED
NOMINAL THREAD SIZE0.750 INCHES ALL ENDS IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A197 ASSN STD 1ST MATERIAL RESPONSE OVERALL
NOMINAL OVERALL LENGTH2.094 INCHES IN
NOMINAL THREAD SIZE0.750 INCHES ALL ENDS IN
REDUCER TYPECONCENTRIC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
MIL-U-18250Interchangeable
interchangeable cross-reference
interchangeable
B16.39Interchangeable
interchangeable cross-reference
interchangeable
198EInterchangeable
IBM 428GB 15K RPM SAS Disk Drive 3.5 (IBM i)
interchangeable
MILU18250TYPEXAInterchangeable
interchangeable cross-reference
interchangeable
1631-400Interchangeable
interchangeable cross-reference
interchangeable
198E2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-U-18250?
MIL-U-18250 is a IBM 428GB 15K RPM SAS Disk Drive 3.5 (IBM i). It is classified as a STORAGE_HDD (2.5_SAS_HDD).
What parts can replace MIL-U-18250?
There are 14 known substitutes for MIL-U-18250: MIL-U-18250, B16.39, 198E and 11 more. Substitute compatibility should be verified for your specific system.
Is MIL-U-18250 still available?
MIL-U-18250 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026