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1781B — 1781B

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

1781B: 1781B.

The 1781B is a the manufacturer industrial component. Key specifications include unit_type: DELAYING SWEEP, end_item_identification: 175A OSCILLOSCOPE A. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-398-9118, 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→ 1781B
NSN: 5305-00-398-9118
NIINs: 003989118, 008559583, 009181825
FSC: 5305 — Screws
CAGE: 830Q4 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
unit_typeDELAYING SWEEP
end_item_identification175A OSCILLOSCOPE A
NSN5305-00-398-9118
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1781B · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL; 0.806 IN. SQUARE; THD DATA 1.250 IN.-12 UNF; EXTERNAL RH; LARGEST END RECESSED; 1.210 IN. DIA BY 1.000 IN. DEEP THD DATA 1.750 IN.-10 UNS RH; 0.188 IN. DIA; 0.202 IN. THK IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL; 0.806 IN. SQUARE; THD DATA 1.250 IN.-12 UNF; EXTERNAL RH; LARGEST END RECESSED; 1.210 IN. DIA BY 1.000 IN. DEEP THD DATA 1.750 IN.-10 UNS RH; 0.188 IN. DIA; 0.202 IN. THK IN
SUBSTITUTES & CROSS-REFERENCES 1
119729PC359Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1781B?
1781B is a 1781B. It is classified as a MRO (MRO_GENERAL).
What parts can replace 1781B?
There is 1 known substitute for 1781B: 119729PC359. Substitute compatibility should be verified for your specific system.
What is the NSN for 1781B?
1781B is cataloged in the U.S. Government catalog under NSN 5305-00-398-9118. 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.