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721617-291 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

721617-291: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 1.000 INCHES NOMINAL IN, style_designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD, width_across_flats: 0.250 INCHES NOMINAL IN, cross-sectional_shape: HEXAGON, left_counterbore_depth: 0.094 INCHES NOMINAL IN, left_counterbore_diameter: 0.158 INCHES MINIMUM AND 0.162 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-238-3219, 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
721617-291
NSN: 5340-00-238-3219
FSC: 5340 — Hardware, Commercial
CAGE: 05869 — RAYTHEON COMPANY DIV RMD STRATEGIC (USA)
SPECIFICATIONS
length1.000 INCHES NOMINAL IN
style_designatorLEFT INTERNAL AND RIGHT EXTERNAL THREAD
width_across_flats0.250 INCHES NOMINAL IN
cross-sectional_shapeHEXAGON
left_counterbore_depth0.094 INCHES NOMINAL IN
left_counterbore_diameter0.158 INCHES MINIMUM AND 0.162 INCHES MAXIMUM IN
NSN5340-00-238-3219
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 721617-291 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
•
LEFT COUNTERBORE DEPTH: 0.094 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
LENGTH: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT EXTERNAL THREAD
•
LEFT COUNTERBORE DIAMETER: 0.158 INCHES MINIMUM AND 0.162 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE: HEXAGON
TECHNICAL CHARACTERISTICS
LEFT COUNTERBORE DEPTH0.094 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
LENGTH1.000 INCHES NOMINAL IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT EXTERNAL THREAD
LEFT COUNTERBORE DIAMETER0.158 INCHES MINIMUM AND 0.162 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 1
PR-366-241Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 721617-291?
721617-291 is a STANDOFF,THREADED,SPACING.
What parts can replace 721617-291?
There is 1 known substitute for 721617-291: PR-366-241. Substitute compatibility should be verified for your specific system.
What is the NSN for 721617-291?
721617-291 is cataloged in the U.S. Government catalog under NSN 5340-00-238-3219. 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.