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128HM10451 — RETAINER,HELICAL COMPRESSION SPR

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

128HM10451: RETAINER,HELICAL COMPRESSION SPR.

RETAINER,HELICAL COMPRESSION SPR. Key specifications include material: STEEL CORROSION RESISTING, overall_height: 2.610 INCHES NOMINAL IN, flange_diameter: 2.000 INCHES NOMINAL IN, flange_thickness: 0.375 INCHES NOMINAL IN, style_designator: IRREGULAR, body_inside_diameter: 1.781 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-971-3508, 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
128HM10451
NSN: 5340-00-971-3508
FSC: 5340 — Hardware, Commercial
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
overall_height2.610 INCHES NOMINAL IN
flange_diameter2.000 INCHES NOMINAL IN
flange_thickness0.375 INCHES NOMINAL IN
style_designatorIRREGULAR
body_inside_diameter1.781 INCHES NOMINAL IN
body_outside_diameter1.968 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
NSN5340-00-971-3508
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 128HM10451 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
•
FLANGE DIAMETER: 2.000 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.375 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 1.968 INCHES NOMINAL IN
•
STYLE DESIGNATOR: IRREGULAR
•
BODY INSIDE DIAMETER: 1.781 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER2.000 INCHES NOMINAL IN
OVERALL HEIGHT2.610 INCHES NOMINAL IN
FLANGE THICKNESS0.375 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.968 INCHES NOMINAL IN
STYLE DESIGNATORIRREGULAR
BODY INSIDE DIAMETER1.781 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIALSTEEL CORROSION RESISTING
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 2
128HM10451-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
128HM10173-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 128HM10451?
128HM10451 is a RETAINER,HELICAL COMPRESSION SPR.
What parts can replace 128HM10451?
There are 2 known substitutes for 128HM10451: 128HM10451-1, 128HM10173-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 128HM10451?
128HM10451 is cataloged in the U.S. Government catalog under NSN 5340-00-971-3508. 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.