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821336-4 — SPRING,HELICAL,COMPRESSION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

821336-4: SPRING,HELICAL,COMPRESSION.

The SPRING,HELICAL,COMPRESSION is a the manufacturer industrial component. Key specifications include diameter: 4.080 INCHES NOMINAL IN, material: GLASS OPTICAL, abbe_constant: 60.300, axial_thickness: 0.395 INCHES NOMINAL IN, refraction_index: 1.6200 NOMINAL, back_focal_length: 19.114 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 6650-00-995-8013, 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
821336-4
NSN: 6650-00-995-8013
NIINs: 009958013, 014696549
FSC: 6650 — Optical Instruments, Test Equipment, Components and Accessories
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
diameter4.080 INCHES NOMINAL IN
materialGLASS OPTICAL
abbe_constant60.300
axial_thickness0.395 INCHES NOMINAL IN
refraction_index1.6200 NOMINAL
back_focal_length19.114 INCHES IN
single_lens_styleDOUBLE CONVEX
front_focal_length18.719 INCHES IN
individual_lens_styleDOUBLE CONVEX
equivalent_focal_length19.383 INCHES IN
element_left_surface_radius12.800 MILLIMETERS MM
element_right_surface_radius187.383 MILLIMETERS MM
NSN6650-00-995-8013
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING,HELICAL,COMPRESSION TITLE COMPONENT PN 821336-4 MFR SPRING,HELICAL,COMPRES
KEY FEATURES
•
INDIVIDUAL LENS STYLE: DOUBLE CONVEX
•
BACK FOCAL LENGTH: 19.114 INCHES IN
•
FRONT FOCAL LENGTH: 18.719 INCHES IN
•
ELEMENT LEFT SURFACE RADIUS: 12.800 MILLIMETERS MM
•
EQUIVALENT FOCAL LENGTH: 19.383 INCHES IN
•
ELEMENT RIGHT SURFACE RADIUS: 187.383 MILLIMETERS MM
•
MATERIAL DOCUMENT AND CLASSIFICATION: JAN-G-174, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE
•
DIAMETER: 4.080 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INDIVIDUAL LENS STYLEDOUBLE CONVEX
BACK FOCAL LENGTH19.114 INCHES IN
FRONT FOCAL LENGTH18.719 INCHES IN
ELEMENT LEFT SURFACE RADIUS12.800 MILLIMETERS MM
EQUIVALENT FOCAL LENGTH19.383 INCHES IN
ELEMENT RIGHT SURFACE RADIUS187.383 MILLIMETERS MM
MATERIAL DOCUMENT AND CLASSIFICATIONJAN-G-174, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE
DIAMETER4.080 INCHES NOMINAL IN
ABBE CONSTANT60.300
AXIAL THICKNESS0.395 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
6650009958013Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementDemilitarization required — mutilation + specific procedure
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FREQUENTLY ASKED QUESTIONS
What is 821336-4?
821336-4 is a SPRING,HELICAL,COMPRESSION.
What parts can replace 821336-4?
There is 1 known substitute for 821336-4: 6650009958013. Substitute compatibility should be verified for your specific system.
What is the NSN for 821336-4?
821336-4 is cataloged in the U.S. Government catalog under NSN 6650-00-995-8013. 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.