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TM20 — MODEM,COMMUNICATIONS

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

TM20: MODEM,COMMUNICATIONS.

The MODEM,COMMUNICATIONS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_shape: STRAIGHT, scale_range: +0.000 TO 20.000 INCHES IN, bore_diameter: 20.00 MILLIMETERS NOMINAL MM, control_valve: NOT PROVIDED, overall_width: 19.0 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-156-6716, 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→ TM20
NSN: 3110-00-156-6716
NIINs: 001566716, 005276757, 013788420, 016633306, 016707271
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 60380 — TIMKEN AEROSPACE, INC DBA TORRINGTON PRODUCT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
scale_range+0.000 TO 20.000 INCHES IN
bore_diameter20.00 MILLIMETERS NOMINAL MM
control_valveNOT PROVIDED
overall_width19.0 INCHES NOMINAL IN
zero_adjusterPROVIDED
load_directionRADIAL
overall_height3.5 INCHES NOMINAL IN
overall_length16.0 INCHES NOMINAL IN
surface_finishGROUND
connection_typeTHREADED
NSN3110-00-156-6716
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: TM20 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
SURFACE FINISH: GROUND
•
STYLE DESIGNATOR: COUNTERBORED OUTER RING, MAGNETO TYPE, S EPARABLE
•
OVERALL OUTSIDE DIAMETER: 52.00 MILLIMETERS NOMINAL MM
•
BORE SHAPE: STRAIGHT
•
NONDEFINITIVE SPEC/STD DATA: 132 TYPE AND 00 GRADE
•
LOAD DIRECTION: RADIAL
TECHNICAL CHARACTERISTICS
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
STYLE DESIGNATORCOUNTERBORED OUTER RING, MAGNETO TYPE, S EPARABLE
OVERALL WIDTH15.00 MILLIMETERS NOMINAL MM
OVERALL OUTSIDE DIAMETER52.00 MILLIMETERS NOMINAL MM
BORE SHAPESTRAIGHT
NONDEFINITIVE SPEC/STD DATA132 TYPE AND 00 GRADE
LOAD DIRECTIONRADIAL
END ITEM IDENTIFICATIONLOGISTICS SUPPORT VESSEL
STANDARD TOLERANCE DESIGNATIONABEC NO.1
SUBSTITUTES & CROSS-REFERENCES 3
FFB171Reference document
Same NSN cross-reference
Reference document — Identification reference
504902-21Reference document
Same NSN cross-reference
Reference document — Secondary reference
M20Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is TM20?
TM20 is a MODEM,COMMUNICATIONS. It is classified as a MRO (MRO_GENERAL).
What parts can replace TM20?
There are 3 known substitutes for TM20: FFB171, 504902-21, M20. Substitute compatibility should be verified for your specific system.
What is the NSN for TM20?
TM20 is cataloged in the U.S. Government catalog under NSN 3110-00-156-6716. 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.