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Technical Data Sheet
PartsTable / COMPONENT / H8638-1
H8638-1 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The GASKET is a the manufacturer industrial component. Key specifications include material: PAPER AND GLUE OVERALL, hole_diameter: 0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 5.190 INCHES NOMINAL IN, aperture_width: 3.500 INCHES NOMINAL IN, overall_length: 5.250 INCHES NOMINAL IN, aperture_length: 4.000 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-061-3272, 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
H8638-1
NSN: 5330-01-061-3272
FSC: 5330
CAGE: 29236 — M-D PNEUMATICS INC (USA)
SPECIFICATIONS
materialPAPER AND GLUE OVERALL
hole_diameter0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width5.190 INCHES NOMINAL IN
aperture_width3.500 INCHES NOMINAL IN
overall_length5.250 INCHES NOMINAL IN
aperture_length4.000 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
bolt_hole_quantity10
inside_corner_radius0.250 INCHES NOMINAL IN
outside_corner_radius0.380 INCHES NOMINAL IN
cross-sectional_thickness0.031 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
NSN5330-01-061-3272
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: H8638-1 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
•
APERTURE LENGTH: 4.000 INCHES NOMINAL IN
•
INSIDE CORNER RADIUS: 0.250 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH: 2.630 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL: PAPER AND GLUE OVERALL
•
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH: 0.345 INCHES NOMINAL IN
•
OUTSIDE CORNER RADIUS: 0.380 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH: 2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE LENGTH4.000 INCHES NOMINAL IN
OVERALL LENGTH5.250 INCHES NOMINAL IN
INSIDE CORNER RADIUS0.250 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH2.630 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIALPAPER AND GLUE OVERALL
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH0.345 INCHES NOMINAL IN
OUTSIDE CORNER RADIUS0.380 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
HOLE DIAMETER0.344 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
BOLT HOLE QUANTITY10
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
8767Interchangeable
interchangeable cross-reference
interchangeable
MIL-PRF-1/1647Interchangeable
interchangeable cross-reference
interchangeable
8638Interchangeable
interchangeable cross-reference
interchangeable
86381Interchangeable
interchangeable cross-reference
interchangeable
P-400-313-018Interchangeable
interchangeable cross-reference
interchangeable
GF-661 G-20-35 G-02-61Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H8638-1?
H8638-1 is a GASKET.
What parts can replace H8638-1?
There are 7 known substitutes for H8638-1: 8767, MIL-PRF-1/1647, 8638 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H8638-1?
H8638-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-061-3272. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026