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Technical Data Sheet
PartsTable / MEMORY / 4-522
4-522 ✓ Verified by PartsTable
IBM · MEMORY · RDIMM
WHAT YOU NEED TO KNOW
Memory is a hot market right now. DDR5 and DDR4 are extremely volatile with data centers driving availability to extreme lows. Always validate machine type and model. Remember: all RAM is Hynix, Samsung, or Micron underneath OEM labels — use that to find alternatives. Key checks: Check OEM alternatives — all RAM is Hynix/Samsung/Micron underneath. Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW

IBM 4GB Memory Kit (2x 2048MB) PC2-5300 667MHz RDIMMs. Key specifications include general_characteristics_item_description: 2 IN.X 25 YDS.; PRESSURE SENSITIVE; FOR USE IN SECURING O.R. TABLE PADS IN, part_name_assigned_by_controlling_agency: FASTENER TAPE LOOP 2"X25 YDS PRESSURE SENSITIVE.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-006-4685, 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
MEMORY→ RDIMM→ 4-522
NSN: 5950-00-006-4685
FSC: 5950
CAGE: 11603 — WINTRON CO (USA)
SPECIFICATIONS
general_characteristics_item_description2 IN.X 25 YDS.; PRESSURE SENSITIVE; FOR USE IN SECURING O.R. TABLE PADS IN
part_name_assigned_by_controlling_agencyFASTENER TAPE LOOP 2"X25 YDS PRESSURE SENSITIVE
NSN5950-00-006-4685
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC4 — RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | 4GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 4-522 MFR IBM 4GB —
KEY FEATURES
•
4GB Capacity
•
MOUNTING METHOD: BRACKET(S) AND UNTHREADED HOLE(S) SINGLE GROUP
•
WINDING OPERATING VOLTAGE: 8.40 AC VOLTS NOMINAL AND 13.40 AC VOLTS NOMINAL AND 16.80 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
•
WINDING OPERATING CURRENT: 2.2 AMPERES AC MAXIMUM SINGLE COMPONENT THIRD SECONDARY
•
TEST DATA DOCUMENT: 57057-8892400014 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING)
•
TERMINAL TYPE AND QUANTITY: 19 SOLDER STUD AND 3 THREADED STUD
•
WINDING FUNCTION AND QUANTITY: 2 PRIMARY AND 5 SECONDARY SINGLE COMPONENT
TYPICAL APPLICATIONS
  • Server memory expansion for virtualization workloads
  • Database performance optimization (in-memory computing)
  • VDI and remote desktop session hosting
  • High-performance computing (HPC) clusters
  • Mail server and collaboration platform scaling
  • Application server tier expansion
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING METHODBRACKET(S) AND UNTHREADED HOLE(S) SINGLE GROUP
WINDING OPERATING VOLTAGE8.40 AC VOLTS NOMINAL AND 13.40 AC VOLTS NOMINAL AND 16.80 AC VOLTS NOMINAL SINGLE COMPONENT FIRST SECONDARY
WINDING OPERATING CURRENT2.2 AMPERES AC MAXIMUM SINGLE COMPONENT THIRD SECONDARY
TEST DATA DOCUMENT57057-8892400014 DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING)
WINDING OPERATING VOLTAGE114.00 AC VOLTS NOMINAL SINGLE COMPONENT ALL PRIMARY
WINDING OPERATING CURRENT1.6 AMPERES AC MAXIMUM SINGLE COMPONENT FOURTH SECONDARY
TERMINAL TYPE AND QUANTITY19 SOLDER STUD AND 3 THREADED STUD
WINDING FUNCTION AND QUANTITY2 PRIMARY AND 5 SECONDARY SINGLE COMPONENT
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO WIDTH2.240 INCHES MINIMUM AND 2.260 INCHES MAXIMUM SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
MOUNTING HOLE DIAMETER0.210 INCHES MINIMUM AND 0.220 INCHES MAXIMUM SINGLE GROUP IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
WL50Interchangeable
interchangeable cross-reference
interchangeable
4522Interchangeable
IBM 4GB Memory Kit (2x 2048MB) PC2-5300 667MHz RDIMMs
interchangeable
AA55518/02Interchangeable
interchangeable cross-reference
interchangeable
TX107-2Interchangeable
interchangeable cross-reference
interchangeable
FH22BMInterchangeable
interchangeable cross-reference
interchangeable
4012290Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-522?
4-522 is a IBM 4GB Memory Kit (2x 2048MB) PC2-5300 667MHz RDIMMs manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 4-522?
There are 15 known substitutes for 4-522: WL50, 4522, AA55518/02 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-522?
4-522 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-006-4685. 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.
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Last verified: July 2026