PartsTable
Technical Data Sheet
Download PDF

2R-638-118 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2R-638-118: RETAINER,PACKING.

The RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, peripheral_diameter: 3.324 INCHES NOMINAL IN, center_hole_diameter: 2.750 INCHES NOMINAL IN, cross-sectional_height: 0.812 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-111-7573, 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
2R-638-118
NSN: 5330-01-111-7573
FSC: 5330 — Packing and Gasket Materials
CAGE: 51729 — DRESSER, INC. DBA DRESSER ROOTS BLOWERS & COMPRESSORS DIV DRESSER ROOTS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
peripheral_diameter3.324 INCHES NOMINAL IN
center_hole_diameter2.750 INCHES NOMINAL IN
cross-sectional_height0.812 INCHES NOMINAL IN
NSN5330-01-111-7573
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2R-638-118 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
•
CROSS-SECTIONAL HEIGHT: 0.812 INCHES NOMINAL IN
•
PERIPHERAL DIAMETER: 3.324 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 2.750 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.812 INCHES NOMINAL IN
PERIPHERAL DIAMETER3.324 INCHES NOMINAL IN
CENTER HOLE DIAMETER2.750 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
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 1
836448040Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy 2R-638-118?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 2R-638-118?
2R-638-118 is a RETAINER,PACKING.
What parts can replace 2R-638-118?
There is 1 known substitute for 2R-638-118: 836448040. Substitute compatibility should be verified for your specific system.
What is the NSN for 2R-638-118?
2R-638-118 is cataloged in the U.S. Government catalog under NSN 5330-01-111-7573. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 2R-638-118

✓ 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.