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20B — RETAINER,ELECTRON TUBE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

20B: RETAINER,ELECTRON TUBE.

The RETAINER,ELECTRON TUBE is a the manufacturer industrial component. Key specifications include shape: ROUND, length: 14.000 INCHES NOMINAL IN, material: IRON CAST HOUSING, base_style: TELEPHONE SLIDE NUMBER ONE, bulb_style: T (TUBULAR), current_type: DC. This part is cataloged in the U.S.

Government catalog under NSN 3030-00-080-8768, 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
20B
NSN: 3030-00-080-8768
NIINs: 000808768, 001536518, 002475159, 002575343, 002732449, 002889875, 003006037, 004746967, 008554917, 010738323, 011418812, 011526114, 012855346, 015590856
FSC: 3030 — Belting, Drive Belts, Fan Belts, and Accessories
CAGE: 25472 — GOODRICH CORPORATION (USA)
SPECIFICATIONS
shapeROUND
length14.000 INCHES NOMINAL IN
materialIRON CAST HOUSING
base_styleTELEPHONE SLIDE NUMBER ONE
bulb_styleT (TUBULAR)
current_typeDC
physical_formSTRAIGHT
overall_height2.375 INCHES NOMINAL IN
overall_length1.688 INCHES MAXIMUM IN
voltage_rating20.000 VOLTS NOMINAL
bulb_designatorT-2
outside_diameter0.156 INCHES NOMINAL IN
NSN3030-00-080-8768
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RETAINER,ELECTRON TUBE TITLE COMPONENT PN 20B MFR RETAINER,ELECTRON TUBE
SUBSTITUTES & CROSS-REFERENCES 8
A38HYTReference document
Same NSN cross-reference
Reference document — Secondary reference
A38Reference document
Same NSN cross-reference
Reference document — Secondary reference
6-1-2304-20-196AReference document
Same NSN cross-reference
Reference document — Secondary reference
208Reference document
Same NSN cross-reference
Reference document — Secondary reference
TE4048S6Reference document
Same NSN cross-reference
Reference document — Secondary reference
AP38Reference 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 20B?
20B is a RETAINER,ELECTRON TUBE.
What parts can replace 20B?
There are 8 known substitutes for 20B: A38HYT, A38, 6-1-2304-20-196A and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20B?
20B is cataloged in the U.S. Government catalog under NSN 3030-00-080-8768. 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.