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D37178A13 — Technical Data Sheet

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— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The OPTIC ASSEMBLY,TEST SET is a the manufacturer optical transceiver module designed for high-speed data center interconnects. Key specifications include material: COPPER ALLOY, inside_diameter: 0.281 INCHES NOMINAL IN, screw_drive_type: HEXAGON SOCKET, style_designator: ROUND, attachment_method: SETSCREWS, overall_thickness: 0.562 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 3120-00-347-5749, 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
D37178A13
NSN: 3120-00-347-5749
FSC: 3120
CAGE: 00000
SPECIFICATIONS
materialCOPPER ALLOY
inside_diameter0.281 INCHES NOMINAL IN
screw_drive_typeHEXAGON SOCKET
style_designatorROUND
attachment_methodSETSCREWS
overall_thickness0.562 INCHES NOMINAL IN
nominal_thread_size0.047 INCHES SCREW HOLE IN
setscrew_hole_quantity2
skirt_outside_diameter0.438 INCHES NOMINAL IN
thread_quantity_per_inch38 SCREW HOLE
shaft_accommodation_styleROUND
gripping_surface_conditionGRIP AID
NSN3120-00-347-5749
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: D37178A13 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
TYPICAL APPLICATIONS
  • Data center switch-to-switch interconnects
  • Server-to-storage fabric connectivity
  • Long-distance fiber optic links
  • High-speed uplink connections (10G/25G/40G/100G)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
203690InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
200854InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
51116InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
HJ-364-01-000InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2119D13InterchangeableGOVERNMENT REGISTRY
Optic Assembly,test Set
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D37178A13?
D37178A13 is a OPTIC ASSEMBLY,TEST SET.
What parts can replace D37178A13?
There are 5 known substitutes for D37178A13: 203690, 200854, 51116 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D37178A13?
D37178A13 is cataloged in the Federal Logistics Information System under NSN 3120-00-347-5749. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: October 2026