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20B18556 — RETAINER,ELECTRON TUBE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

20B18556: RETAINER,ELECTRON TUBE.

The RETAINER,ELECTRON TUBE is a the manufacturer industrial component. Key specifications include material: STEEL, overall_diameter: 1.813 INCHES NOMINAL IN, style_designator: SPRING TENSION LOCK RING, surface_treatment: CADMIUM, unthreaded_mounting_hole_diameter: 0.136 INCHES NOMINAL SINGLE MOUNTING FACILITY IN, mounting_facility_type_and_quantity: 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY. This part is cataloged in the U.S.

Government catalog under NSN 5960-00-170-4447, 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
20B18556
NSN: 5960-00-170-4447
FSC: 5960 — Electron Tubes and Associated Hardware
CAGE: 71785 — CINCH CONNECTIVITY SOLUTIONS INC. (USA)
SPECIFICATIONS
materialSTEEL
overall_diameter1.813 INCHES NOMINAL IN
style_designatorSPRING TENSION LOCK RING
surface_treatmentCADMIUM
unthreaded_mounting_hole_diameter0.136 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
mounting_facility_type_and_quantity2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
accommodated_item_securing_device_typeSPRING CLIP
electron_tube_base_accommodated_diameter+1.235 TO 1.275 INCHES IN
distance_between_mounting_facility_centers1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE
NSN5960-00-170-4447
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RETAINER,ELECTRON TUBE TITLE COMPONENT PN 20B18556 MFR RETAINER,ELECTRON TUBE
KEY FEATURES
•
MOUNTING FACILITY TYPE AND QUANTITY: 2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE
•
OVERALL DIAMETER: 1.813 INCHES NOMINAL IN
•
UNTHREADED MOUNTING HOLE DIAMETER: 0.136 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
•
STYLE DESIGNATOR: SPRING TENSION LOCK RING
•
ACCOMMODATED ITEM SECURING DEVICE TYPE: SPRING CLIP
•
DISTANCE BETWEEN MOUNTING FACILITY CENTERS: 1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
•
ELECTRON TUBE BASE ACCOMMODATED DIAMETER: +1.235 TO 1.275 INCHES IN
TECHNICAL CHARACTERISTICS
MOUNTING FACILITY TYPE AND QUANTITY2 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE
OVERALL DIAMETER1.813 INCHES NOMINAL IN
UNTHREADED MOUNTING HOLE DIAMETER0.136 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
STYLE DESIGNATORSPRING TENSION LOCK RING
ACCOMMODATED ITEM SECURING DEVICE TYPESPRING CLIP
DISTANCE BETWEEN MOUNTING FACILITY CENTERS1.500 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
ELECTRON TUBE BASE ACCOMMODATED DIAMETER+1.235 TO 1.275 INCHES IN
SURFACE TREATMENTCADMIUM
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 3
128204Reference document
Same NSN cross-reference
Reference document — Secondary reference
8169993Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
8599Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 20B18556?
20B18556 is a RETAINER,ELECTRON TUBE.
What parts can replace 20B18556?
There are 3 known substitutes for 20B18556: 128204, 8169993, 8599. Substitute compatibility should be verified for your specific system.
What is the NSN for 20B18556?
20B18556 is cataloged in the U.S. Government catalog under NSN 5960-00-170-4447. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.