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AM4 — VOLTMETER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AM4: VOLTMETER.

The VOLTMETER is a the manufacturer industrial component. Key specifications include material: PLASTIC, corner_shape: SQUARE ALL CORNERS, overall_width: 4.687 INCHES NOMINAL IN, overall_height: 4.125 INCHES NOMINAL IN, overall_length: 1.365 INCHES NOMINAL IN, style_designator: RECTANGULAR FLUSH MTG. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-218-1776, 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
AM4
NSN: 5340-00-218-1776
NIINs: 002181776, 008663581, 009071506
FSC: 5340 — Hardware, Commercial
CAGE: 42689 — NATIONAL LOCK CO (USA)
SPECIFICATIONS
materialPLASTIC
corner_shapeSQUARE ALL CORNERS
overall_width4.687 INCHES NOMINAL IN
overall_height4.125 INCHES NOMINAL IN
overall_length1.365 INCHES NOMINAL IN
style_designatorRECTANGULAR FLUSH MTG
features_providedZERO ADJUSTER
accuracy_in_percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR ALL RANGES
installation_designPANEL
body_inside_diameter0.2498 INCHES MINIMUM AND 0.2502 INCHES MAXIMUM IN
mounting_stud_length0.437 INCHES NOMINAL IN
body_outside_diameter0.6245 INCHES MINIMUM AND 0.6250 INCHES MAXIMUM IN
NSN5340-00-218-1776
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AM4 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
SUBSTITUTES & CROSS-REFERENCES 2
180AJReference document
Same NSN cross-reference
Reference document — Secondary reference
J41Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AM4?
AM4 is a VOLTMETER.
What parts can replace AM4?
There are 2 known substitutes for AM4: 180AJ, J41. Substitute compatibility should be verified for your specific system.
What is the NSN for AM4?
AM4 is cataloged in the U.S. Government catalog under NSN 5340-00-218-1776. 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.