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221-9778 — POWER STUD

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

221-9778: POWER STUD.

The POWER STUD is a the manufacturer industrial component. Key specifications include end_item_identification: 2320-01-542-7628;TRUCK,CARGO,22.5 TON,10X10,LVSR;MODEL NUMBER MKR18;MRAP-CAIMAN, part_name_assigned_by_controlling_agency: PULLER STUD. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-566-1530, 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
221-9778
NSN: 5340-01-566-1530
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
end_item_identification2320-01-542-7628;TRUCK,CARGO,22.5 TON,10X10,LVSR;MODEL NUMBER MKR18;MRAP-CAIMAN
part_name_assigned_by_controlling_agencyPULLER STUD
NSN5340-01-566-1530
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 221-9778 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
PART NAME ASSIGNED BY CONTROLLING AGENCYPULLER STUD
END ITEM IDENTIFICATION2320-01-542-7628;TRUCK,CARGO,22.5 TON,10X10,LVSR;MODEL NUMBER MKR18;MRAP-CAIMAN
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
14KP685Reference document
Same NSN cross-reference
Reference document — Secondary reference
12KP685Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 221-9778?
221-9778 is a POWER STUD.
What parts can replace 221-9778?
There are 2 known substitutes for 221-9778: 14KP685, 12KP685. Substitute compatibility should be verified for your specific system.
What is the NSN for 221-9778?
221-9778 is cataloged in the U.S. Government catalog under NSN 5340-01-566-1530. 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.