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Technical Data Sheet
PartsTable / COMPONENT / A75-4-557
A75-4-557 ✓ 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 BUMPER is a the manufacturer industrial component. Key specifications include color: BLACK, material: RUBBER SYNTHETIC, hole_diameter: 0.250 INCHES NOMINAL IN, overall_height: 1.875 INCHES NOMINAL IN, style_designator: FLAT TOP COUNTERBORED, first_counterbore_depth: 0.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-664-8344, 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
A75-4-557
NSN: 5340-00-664-8344
FSC: 5340
CAGE: 81361 — EDGEWOOD CHEMICAL BIOLOGICAL CENTER ECBC (USA)
SPECIFICATIONS
colorBLACK
materialRUBBER SYNTHETIC
hole_diameter0.250 INCHES NOMINAL IN
overall_height1.875 INCHES NOMINAL IN
style_designatorFLAT TOP COUNTERBORED
first_counterbore_depth0.750 INCHES NOMINAL IN
material_hardness_rating65.0 DUROMETER MINIMUM AND 75.0 DUROMETER MAXIMUM
first_counterbore_diameter0.375 INCHES NOMINAL IN
outside/top_flange_diameter1.250 INCHES NOMINAL IN
material_document_and_classificationMIL-STD-417, TYPE R, CLASS RS, GRADE RS705 MIL STD SINGLE MATERIAL RESPONSE
NSN5340-00-664-8344
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A75-4-557 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
•
MATERIAL HARDNESS RATING: 65.0 DUROMETER MINIMUM AND 75.0 DUROMETER MAXIMUM
•
COLOR: BLACK
•
OUTSIDE/TOP FLANGE DIAMETER: 1.250 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
HOLE DIAMETER: 0.250 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-STD-417, TYPE R, CLASS RS, GRADE RS705 MIL STD SINGLE MATERIAL RESPONSE
•
FIRST COUNTERBORE DEPTH: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT1.875 INCHES NOMINAL IN
MATERIAL HARDNESS RATING65.0 DUROMETER MINIMUM AND 75.0 DUROMETER MAXIMUM
COLORBLACK
OUTSIDE/TOP FLANGE DIAMETER1.250 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
HOLE DIAMETER0.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-STD-417, TYPE R, CLASS RS, GRADE RS705 MIL STD SINGLE MATERIAL RESPONSE
FIRST COUNTERBORE DEPTH0.750 INCHES NOMINAL IN
FIRST COUNTERBORE DIAMETER0.375 INCHES NOMINAL IN
STYLE DESIGNATORFLAT TOP COUNTERBORED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
61196Interchangeable
interchangeable cross-reference
interchangeable
61196-12Interchangeable
interchangeable cross-reference
interchangeable
59643Interchangeable
interchangeable cross-reference
interchangeable
6-1-742-1-8-8AInterchangeable
interchangeable cross-reference
interchangeable
F80FPLP6-5GPH45Interchangeable
interchangeable cross-reference
interchangeable
MS49007-25SH45Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A75-4-557?
A75-4-557 is a BUMPER.
What parts can replace A75-4-557?
There are 7 known substitutes for A75-4-557: 61196, 61196-12, 59643 and 4 more. Substitute compatibility should be verified for your specific system.
Is A75-4-557 still available?
A75-4-557 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026