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K-31 — CYLINDER ASSEMBLY,ACTUATING,LINE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

K-31: CYLINDER ASSEMBLY,ACTUATING,LINE.

CYLINDER ASSEMBLY,ACTUATING,LINE. Key specifications include material: COPPER ALLOY OVERALL, case_style: SQUARE, seal_width: 0.375 INCHES NOMINAL IN, temp_rating: -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF, corner_shape: SQUARE INSIDE LEFT CORNER, flange_width: 0.1220 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-003-9280, 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
K-31
NSN: 5330-00-003-9280
NIINs: 000039280, 004758611, 006614959, 012449580, 012778002, 013571592
FSC: 5330 — Packing and Gasket Materials
CAGE: 79218 — WATEROUS COMPANY (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
case_styleSQUARE
seal_width0.375 INCHES NOMINAL IN
temp_rating-65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF
corner_shapeSQUARE INSIDE LEFT CORNER
flange_width0.1220 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN
bore_diameter2.000 INCHES NOMINAL IN
overall_length0.3180 INCHES NOMINAL IN
extended_length48.370 INCHES NOMINAL IN
special_featuresWITH PROTECTIVE INNER CASE
style_designatorSOLID, EXTERNAL FLANGE ONE END
compressed_length38.370 INCHES NOMINAL IN
NSN5330-00-003-9280
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: K-31 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
•
TEMP RATING: -65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF
•
SEAL WIDTH: 0.375 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULAR
•
HOUSING BORE DIAMETER: 1.250 INCHES NOMINAL IN
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 3000 FEET PER MINUTE FT
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT DIAMETER: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
TEMP RATING-65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF
SEAL WIDTH0.375 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER1.250 INCHES NOMINAL IN
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3000 FEET PER MINUTE FT
CASE STYLESQUARE
SPECIAL FEATURESWITH PROTECTIVE INNER CASE
ACCOMMODATED SHAFT DIAMETER0.750 INCHES NOMINAL IN
MATERIALSTEEL CASE
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
SUBSTITUTES & CROSS-REFERENCES 9
A1405B2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
43-959Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AA753Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
KE532Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
12524Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MD3264Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K-31?
K-31 is a CYLINDER ASSEMBLY,ACTUATING,LINE.
What parts can replace K-31?
There are 9 known substitutes for K-31: A1405B2, 43-959, AA753 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K-31?
K-31 is cataloged in the U.S. Government catalog under NSN 5330-00-003-9280. 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.