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S38421-113BAK1 — PACKING ASSEMBLY

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

S38421-113BAK1: PACKING ASSEMBLY.

The PACKING ASSEMBLY is a the manufacturer industrial component. Key specifications include height: 0.177 INCHES NOMINAL IN, material: PLASTIC POLYTETRAFLUOROETHYLENE TOP RING, joint_type: SCARF-PERIPHERAL BOTTOM RING, temp_rating: -65.0 FAHRENHEIT AND 71.0 FAHRENHEIT DEGF, inside_diameter: 0.547 INCHES NOMINAL IN, outside_diameter: 0.738 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-533-8134, 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
S38421-113BAK1
NSN: 5330-00-533-8134
FSC: 5330 — Packing and Gasket Materials
CAGE: 09257 — TRELLEBORG SEALING SOLUTIONS US, INC. (USA)
SPECIFICATIONS
height0.177 INCHES NOMINAL IN
materialPLASTIC POLYTETRAFLUOROETHYLENE TOP RING
joint_typeSCARF-PERIPHERAL BOTTOM RING
temp_rating-65.0 FAHRENHEIT AND 71.0 FAHRENHEIT DEGF
inside_diameter0.547 INCHES NOMINAL IN
outside_diameter0.738 INCHES NOMINAL IN
special_featuresFLIGHT SAFETY CRITICAL AIRCRAFT PART
end_item_identificationAIRCRAFT,EAGLE F-15;AIRCRAFT,STRATOLIFTER C-135;AIRCRAFT,HARRIER AV-8B
intermediate_ring_quantity1
cross-sectional_shape_styleSQUARE/RECTANGULAR TOP RING
specification/standard_data76301-ST7-254 MANUFACTURERS SPECIFICATION
criticality_code_justificationFEAT
NSN5330-00-533-8134
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S38421-113BAK1 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 71.0 FAHRENHEIT DEGF
•
INTERMEDIATE RING QUANTITY: 1
•
OUTSIDE DIAMETER: 0.738 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE BOTTOM RING
•
CROSS-SECTIONAL SHAPE STYLE: SQUARE/RECTANGULAR BOTTOM RING
TECHNICAL CHARACTERISTICS
TEMP RATING-65.0 FAHRENHEIT AND 71.0 FAHRENHEIT DEGF
INTERMEDIATE RING QUANTITY1
OUTSIDE DIAMETER0.738 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONFEAT
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE BOTTOM RING
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE TOP RING
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR BOTTOM RING
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR TOP RING
CROSS-SECTIONAL SHAPE STYLESPECIAL INTERMEDIATE RING
SPECIFICATION/STANDARD DATA76301-ST7-254 MANUFACTURERS SPECIFICATION
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 2
7113MS160TReference document
Same NSN cross-reference
Reference document — Secondary reference
ST7M254-113-2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S38421-113BAK1?
S38421-113BAK1 is a PACKING ASSEMBLY.
What parts can replace S38421-113BAK1?
There are 2 known substitutes for S38421-113BAK1: 7113MS160T, ST7M254-113-2. Substitute compatibility should be verified for your specific system.
What is the NSN for S38421-113BAK1?
S38421-113BAK1 is cataloged in the U.S. Government catalog under NSN 5330-00-533-8134. 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.