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BM4979 — MAGNET,PERMANENT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

BM4979: MAGNET,PERMANENT.

The MAGNET,PERMANENT is a the manufacturer industrial component. Key specifications include shape: RECTANGULAR, material: CERAMIC, face_size: 2.120 IN. BY 1.380 IN.

ALGCGTWO 0.280 IN. DIA HOLES SPACED 2.620 IN. C TO C IN, overall_width: 1.380 INCHES NOMINAL IN, overall_height: 0.380 INCHES NOMINAL IN, overall_length: 3.250 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 5340-01-072-4399, 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
BM4979
NSN: 5340-01-072-4399
FSC: 5340 — Hardware, Commercial
CAGE: 30876 — BUNTING MAGNETICS CO (USA)
SPECIFICATIONS
shapeRECTANGULAR
materialCERAMIC
face_size2.120 IN. BY 1.380 IN. ALGCGTWO 0.280 IN. DIA HOLES SPACED 2.620 IN. C TO C IN
overall_width1.380 INCHES NOMINAL IN
overall_height0.380 INCHES NOMINAL IN
overall_length3.250 INCHES NOMINAL IN
NSN5340-01-072-4399
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: BM4979 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
•
FACE SIZE: 2.120 IN. BY 1.380 IN. ALGCGTWO 0.280 IN. DIA HOLES SPACED 2.620 IN. C TO C IN
•
SHAPE: RECTANGULAR
•
MATERIAL: CERAMIC
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.380 INCHES NOMINAL IN
FACE SIZE2.120 IN. BY 1.380 IN. ALGCGTWO 0.280 IN. DIA HOLES SPACED 2.620 IN. C TO C IN
SHAPERECTANGULAR
OVERALL LENGTH3.250 INCHES NOMINAL IN
OVERALL WIDTH1.380 INCHES NOMINAL IN
MATERIALCERAMIC
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

No substitute or cross-reference records for this part.

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 BM4979?
BM4979 is a MAGNET,PERMANENT.
What is the NSN for BM4979?
BM4979 is cataloged in the U.S. Government catalog under NSN 5340-01-072-4399. 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.