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161957 — STAY,LOCKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

161957: STAY,LOCKING.

The STAY,LOCKING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304, overall_width: 0.440 INCHES NOMINAL IN, overall_length: 4.440 INCHES NOMINAL IN, style_designator: SINGLE, surface_treatment: PASSIVATE, material_thickness: 0.063 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-200-9884, 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
161957
NSN: 5340-01-200-9884
NIINs: 012009884, 016314225
FSC: 5340 — Hardware, Commercial
CAGE: 21877 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 304
overall_width0.440 INCHES NOMINAL IN
overall_length4.440 INCHES NOMINAL IN
style_designatorSINGLE
surface_treatmentPASSIVATE
material_thickness0.063 INCHES NOMINAL IN
mounting_hole_typePLAIN
operational_directionLEFT-HAND OR RIGHT-HAND
mounting_hole_diameter0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-766,FINISH 2D FED SPEC SINGLE MATERIAL RESPONSE
surface_treatment_document_and_classificationQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE
NSN5340-01-200-9884
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 161957 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OPERATIONAL DIRECTION: LEFT-HAND OR RIGHT-HAND
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE
•
STYLE DESIGNATOR: SINGLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766,FINISH 2D FED SPEC SINGLE MATERIAL RESPONSE
•
MOUNTING HOLE DIAMETER: 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.063 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OPERATIONAL DIRECTIONLEFT-HAND OR RIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE
STYLE DESIGNATORSINGLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766,FINISH 2D FED SPEC SINGLE MATERIAL RESPONSE
MOUNTING HOLE DIAMETER0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
OVERALL LENGTH4.440 INCHES NOMINAL IN
OVERALL WIDTH0.440 INCHES NOMINAL IN
MATERIAL THICKNESS0.063 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE
MATERIALSTEEL COMP 304
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 161957?
161957 is a STAY,LOCKING.
What is the NSN for 161957?
161957 is cataloged in the U.S. Government catalog under NSN 5340-01-200-9884. 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.