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ST57D100-4 — NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

ST57D100-4: NUT,TUBE COUPLING.

The NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OR STEEL CORROSION RESISTING OVERALL, nut_style: TUBE COUPLING, nut_height: 1.047 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT (UNJ). This part is cataloged in the U.S.

Government catalog under NSN 4730-00-009-2133, 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
ST57D100-4
NSN: 4730-00-009-2133
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OR STEEL CORROSION RESISTING OVERALL
nut_styleTUBE COUPLING
nut_height1.047 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN
seat_angle45.00 DEGREES NOMINAL
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT (UNJ)
special_featuresGRUMMAN A10 AIRCRAFT
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
length_to_shoulder0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
width_across_flats1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
nominal_thread_size1.062 INCHES IN
NSN4730-00-009-2133
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST57D100-4 · OEM ⚠ 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
•
LENGTH TO SHOULDER: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC 1ST TREATMENT RESPONSE AND QQ-P-35 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT (UNJ)
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66,AISI 304/SAE 30304 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
SEAT ANGLE: 45.00 DEGREES NOMINAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.062 INCHES IN
TECHNICAL CHARACTERISTICS
LENGTH TO SHOULDER0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC 1ST TREATMENT RESPONSE AND QQ-P-35 FED SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT (UNJ)
MATERIAL DOCUMENT AND CLASSIFICATION66,AISI 304/SAE 30304 FED STD SINGLE MATERIAL RESPONSE OVERALL
SEAT ANGLE45.00 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.062 INCHES IN
NUT HEIGHT1.047 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN
SPECIAL FEATURESGRUMMAN A10 AIRCRAFT
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 7
H10006-12Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
D10006-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
LD83096-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
AC1170C12Reference document
Same NSN cross-reference
Reference document — Secondary reference
AC1180C12Reference document
Same NSN cross-reference
Reference document — Secondary reference
D10006J12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST57D100-4?
ST57D100-4 is a NUT,TUBE COUPLING.
What parts can replace ST57D100-4?
There are 7 known substitutes for ST57D100-4: H10006-12, D10006-12, LD83096-12 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST57D100-4?
ST57D100-4 is cataloged in the U.S. Government catalog under NSN 4730-00-009-2133. 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.