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Technical Data Sheet
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123-111-4 — LOCKNUT,PIPE

✓ Government record, cited
3M · HOSE FITTING
PRODUCT OVERVIEW

123-111-4: LOCKNUT,PIPE.

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Vikuiti protection films are designed for application to electronic displays. This part is cataloged in the U.S. Government catalog under NSN 4730-00-277-7878, 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
123-111-4
NSN: 4730-00-277-7878
NIINs: 002777878, 013671440
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 80996 — ITT GRINNELL CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_stylePIPE LOCKNUT
thread_seriesNPSL
thread_directionRIGHT-HAND
width_across_flats2.188 INCHES NOMINAL IN
nominal_thread_size1.250 INCHES IN
packing_recess_depth0.0625 INCHES NOMINAL IN
packing_recess_diameter1.938 INCHES NOMINAL IN
thread_quantity_per_inch11-5
NSN4730-00-277-7878
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 123-111-4 · 3M ⚠ 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
•
WIDTH ACROSS FLATS: 2.188 INCHES NOMINAL IN
•
PACKING RECESS DIAMETER: 1.938 INCHES NOMINAL IN
•
THREAD SERIES: NPSL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
NUT STYLE: PIPE LOCKNUT
•
THREAD QUANTITY PER INCH: 11-5
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS2.188 INCHES NOMINAL IN
PACKING RECESS DIAMETER1.938 INCHES NOMINAL IN
THREAD SERIESNPSL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.250 INCHES IN
NUT STYLEPIPE LOCKNUT
THREAD QUANTITY PER INCH11-5
MATERIALCOPPER ALLOY OVERALL
PACKING RECESS DEPTH0.0625 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
1231Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 123-111-4?
123-111-4 is a LOCKNUT,PIPE manufactured by 3M.
What parts can replace 123-111-4?
There is 1 known substitute for 123-111-4: 1231. Substitute compatibility should be verified for your specific system.
What is the NSN for 123-111-4?
123-111-4 is cataloged in the U.S. Government catalog under NSN 4730-00-277-7878. 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.