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Technical Data Sheet
PartsTable / STORAGE_HDD / 4-2556-518
4-2556-518 ✓ Verified by PartsTable
— · STORAGE_HDD · 2.5_SAS_HDD
WHAT YOU NEED TO KNOW
SAS HDD backplane accepts SATA drives, SATA backplane does NOT accept SAS 2.5" SAS HDDs come with or without carrier/tray — ALWAYS ASK
ALWAYS confirm carrier/tray PN — server-specific trays vary by generation
PRODUCT OVERVIEW

The IBM 35.16GB 15K RPM DISK UNIT is a the manufacturer hard disk drive designed for enterprise environments demanding consistent performance and data integrity. Key specifications include material: STEEL, overall_width: 1.500 INCHES NOMINAL IN, terminal_type: TAB W/SCREW, overall_height: 1.219 INCHES NOMINAL IN, overall_length: 3.625 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-01-176-6498, 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→ 4-2556-518
NSN: 5930-01-176-6498
FSC: 5930
CAGE: 76854 — ELECTRO SWITCH CORP. DBA OAK GRISGSBY DIV ELECTROSWITCH (USA)
SPECIFICATIONS
materialSTEEL
overall_width1.500 INCHES NOMINAL IN
terminal_typeTAB W/SCREW
overall_height1.219 INCHES NOMINAL IN
overall_length3.625 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES
insert_materialPLASTIC SINGLE MATING END
mounting_methodFLANGE
mating_end_quantity1
nominal_thread_size0.500 INCHES SINGLE PRESSURE CONNECTION IN
pressure_switch_typeGAGE
included_contact_typeFLAT SOCKET SINGLE MATING END SINGLE CONTACT GROUPING
NSN5930-01-176-6498
COMPONENT DIAGRAM
LABEL 35.16GB HDD SAS 12Gb/s 69.85 mm (2.75") 100.0 mm 2.5" HDD — MECHANICAL Spinning disk, hot-swap SAS 12Gb/s — Dual-port 35.16GB | 7200 / 10K / 15K RPM FORM FACTOR — 2.5" Hot-swap, carrier-specific MOUNTING — 4x M3 bottom Standard SFF screw pattern TITLE HDD DRIVE PN 4-2556-518 MFR IBM 35.16GB 15K RPM DISK UNIT
KEY FEATURES
•
35.16GB Capacity
•
15K RPM Speed
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
4326Interchangeable
IBM 35.16GB 15k RPM Disk Unit
interchangeable
10465549Interchangeable
interchangeable cross-reference
interchangeable
53B7130Interchangeable
interchangeable cross-reference
interchangeable
7051Interchangeable
interchangeable cross-reference
interchangeable
17733Interchangeable
interchangeable cross-reference
interchangeable
B4326Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-2556-518?
4-2556-518 is a IBM 35.16GB 15K RPM DISK UNIT. It is classified as a STORAGE_HDD (2.5_SAS_HDD).
What parts can replace 4-2556-518?
There are 18 known substitutes for 4-2556-518: 4326, 10465549, 53B7130 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-2556-518?
4-2556-518 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5930-01-176-6498. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026