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5191951 — CAP,FILLER OPENING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5191951: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1018 OR STEEL COMP 1022 OVERALL, thread_length: 0.960 INCHES NOMINAL IN, overall_height: 1.340 INCHES NOMINAL IN, thread_diameter: 2.000 INCHES NOMINAL IN, style_designator: THREADED TYPE EXTERNAL, features_provided: BREATHER HOLE. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-287-9438, 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
5191951
NSN: 5340-01-287-9438
NIINs: 012879438, 012880790
FSC: 5340 — Hardware, Commercial
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL COMP 1018 OR STEEL COMP 1022 OVERALL
thread_length0.960 INCHES NOMINAL IN
overall_height1.340 INCHES NOMINAL IN
thread_diameter2.000 INCHES NOMINAL IN
style_designatorTHREADED TYPE EXTERNAL
features_providedBREATHER HOLE
surface_treatmentPAINT BODY
accommodation_typeHEXAGON END GRIPPING
thread_series_designatorNPT
system_for_which_designedNONPRESSURIZED
filler_neck_diameter_for_which_designed2.150 INCHES NOMINAL IN
surface_treatment_document_and_classificationMIL-STD-1303,SYSTEM NO.76 MIL STD SINGLE TREATMENT RESPONSE BODY
NSN5340-01-287-9438
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5191951 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESSTEEL,ASTM A366,PAINT SURFACE TREATMENT MIL-STD-1303 SYSTEM NO. 76; OVERALL LENGTH 22.310 IN.; OVERALL WIDTH 4.000 IN.; THICKNESS 0.250 IN.; ONE SLOT; FOUR HOLES VARIOUS SIZES; OPPOSITE P/N 5191958-2 IN
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 5191951?
5191951 is a CAP,FILLER OPENING.
What is the NSN for 5191951?
5191951 is cataloged in the U.S. Government catalog under NSN 5340-01-287-9438. 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.