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31-21 — RELAY,ELECTROMAGNETIC

✓ Government record, cited
Giochi Preziosi · MRO · MRO_GENERAL
PRODUCT OVERVIEW

31-21: RELAY,ELECTROMAGNETIC.

The RELAY,ELECTROMAGNETIC is a Giochi Preziosi industrial component. Key specifications include width: 44.000 INCHES NOMINAL IN, length: 22.000 INCHES NOMINAL IN, weight: 1.80 OUNCES PER LINEAR YARD OZ, diameter: 0.483 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, end_type: EXTERNAL THREAD SECOND END, material: RUBBER SEAL. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-100-0683, 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→ 31-21
NSN: 3110-00-100-0683
NIINs: 001000683, 001786822, 002599909, 002643593, 005572143, 006343460, 006814716, 010070145, 010425943, 010499128, 011290466, 011656732, 011804642, 011926029, 012040663, 012828377, 012967546, 013097690, 013673937, 014184208, 016974350
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 33705 — KINGHAM TRAILER CO (USA)
SPECIFICATIONS
width44.000 INCHES NOMINAL IN
length22.000 INCHES NOMINAL IN
weight1.80 OUNCES PER LINEAR YARD OZ
diameter0.483 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
end_typeEXTERNAL THREAD SECOND END
materialRUBBER SEAL
duty_typeCONTINUOUS
cloth_namePLAIN WEAVE
cone_width1.8375 INCHES NOMINAL IN
head_styleTEE NO. 5
design_typeNONREUSABLE
head_length0.780 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
NSN3110-00-100-0683
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 31-21 · Giochi Preziosi ⚠ 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
•
STYLE DESIGNATOR: NORMAL ANGLE
•
CONE CORNER RADIUS: 0.1406 INCHES NOMINAL IN
•
CONE WIDTH: 1.8375 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
BORE DIAMETER: 3.3475 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORNORMAL ANGLE
CONE CORNER RADIUS0.1406 INCHES NOMINAL IN
CONE WIDTH1.8375 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYBEARING,CONE OTR WHL
END ITEM IDENTIFICATIONMRAP MAXXPRO
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER3.3475 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 7
749Reference document
Same NSN cross-reference
Reference document — Secondary reference
16887JReference document
Same NSN cross-reference
Reference document — Secondary reference
139D6Reference document
Same NSN cross-reference
Reference document — Secondary reference
667567Reference document
Same NSN cross-reference
Reference document — Secondary reference
240036Reference document
Same NSN cross-reference
Reference document — Secondary reference
21FX2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 31-21?
31-21 is a RELAY,ELECTROMAGNETIC manufactured by Giochi Preziosi. It is classified as a MRO (MRO_GENERAL).
What parts can replace 31-21?
There are 7 known substitutes for 31-21: 749, 16887J, 139D6 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31-21?
31-21 is cataloged in the U.S. Government catalog under NSN 3110-00-100-0683. 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.