PartsTable
Technical Data Sheet
PartsTable / MRO / M518
M518 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

MODIFICATION KIT,TELEPHONE EQUIP. Key specifications include material: STEEL OVERALL, thickness: 0.152 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN, lining_style: CLUTCH DISK, major_diameter: 5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN, minor_diameter: 2.750 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN, overall_length: 139.37 MILLIMETERS NOMINAL MM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-152-0128, 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
MRO→ MRO_GENERAL→ M518
NSN: 4730-00-152-0128
FSC: 4730
CAGE: CN1L2 — STEMME GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.152 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
lining_styleCLUTCH DISK
major_diameter5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
minor_diameter2.750 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN
overall_length139.37 MILLIMETERS NOMINAL MM
application_typeDRY
special_features1/4-18 PIPE THREAD CONNECTION; TOTAL LENGTH OF ADAPTER 1.58 INCHES; 9/16 HEX IN
attachment_methodRIVETED
features_providedRIGID FRICTION LINING
fabrication_methodWOVEN
hole_arrangement_styleSTAGGERED
NSN4730-00-152-0128
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M518 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURES1/4-18 PIPE THREAD CONNECTION; TOTAL LENGTH OF ADAPTER 1.58 INCHES; 9/16 HEX IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
FMS518Interchangeable
interchangeable cross-reference
interchangeable
4A0521Interchangeable
interchangeable cross-reference
interchangeable
3018-244Interchangeable
interchangeable cross-reference
interchangeable
H1957500Interchangeable
interchangeable cross-reference
interchangeable
19575Interchangeable
interchangeable cross-reference
interchangeable
M 518Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy M518?
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 M518?
M518 is a MODIFICATION KIT,TELEPHONE EQUIP. It is classified as a MRO (MRO_GENERAL).
What parts can replace M518?
There are 11 known substitutes for M518: FMS518, 4A0521, 3018-244 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M518?
M518 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-152-0128. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — M518

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026