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ST57D99 — ELBOW,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

ST57D99: ELBOW,TUBE.

The ELBOW,TUBE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, flow_angle: 45.0 DEGREES, leg_length: 2.055 INCHES MINIMUM AND 2.085 INCHES MAXIMUM FIRST END IN, connection_type: UNTHREADED INTERNAL TUBE ALL ENDS, connection_style: SWAGED W/ GROOVES (TUBE) ALL ENDS, surface_treatment: PASSIVATE OUTSIDE. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-535-2146, 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
ST57D99
NSN: 4730-00-535-2146
NIINs: 005352146, 005352175, 005362210, 005362212, 005362269
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
flow_angle45.0 DEGREES
leg_length2.055 INCHES MINIMUM AND 2.085 INCHES MAXIMUM FIRST END IN
connection_typeUNTHREADED INTERNAL TUBE ALL ENDS
connection_styleSWAGED W/ GROOVES (TUBE) ALL ENDS
surface_treatmentPASSIVATE OUTSIDE
end_item_identification79F MISSILE, MX PEACEKEEPER
material_document_and_classificationAMS 5656,TYPE 21-6-9 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
nominal_outside_diameter_tube_accommodated0.750 INCHES ALL ENDS IN
surface_treatment_document_and_classificationMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
tubing_wall_nominal_thickness_for_which_designed0.035 INCHES ALL ENDS IN
NSN4730-00-535-2146
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST57D99 · 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
•
FLOW ANGLE: 45.0 DEGREES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
•
CONNECTION STYLE: SWAGED W/ GROOVES (TUBE) ALL ENDS
•
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED: 0.035 INCHES ALL ENDS IN
•
CONNECTION TYPE: UNTHREADED INTERNAL TUBE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5656,TYPE 21-6-9 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FLOW ANGLE45.0 DEGREES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,E300,TY2 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
CONNECTION STYLESWAGED W/ GROOVES (TUBE) ALL ENDS
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED0.035 INCHES ALL ENDS IN
CONNECTION TYPEUNTHREADED INTERNAL TUBE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5656,TYPE 21-6-9 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES ALL ENDS IN
LEG LENGTH1.190 INCHES MINIMUM AND 1.220 INCHES MAXIMUM FIRST END IN
SPECIAL FEATURESTHE INTERNAL SURFACE OF THE PERMASWAGE ENDS,WILL BE POLYTETRAFLUOROETHYLENE COATED,PER DEUTSCH CO,SPEC NO. DMCPS1009,TO 0.220 IN. MIN 0.270 IN. MAX,INTO THE FITTING BORE IN
SUBSTITUTES & CROSS-REFERENCES 5
H10090-06Reference document
Same NSN cross-reference
Reference document — Secondary reference
LD83061-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
D10090-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
ST57D99-2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AC1107C06Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST57D99?
ST57D99 is a ELBOW,TUBE.
What parts can replace ST57D99?
There are 5 known substitutes for ST57D99: H10090-06, LD83061-6, D10090-6 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST57D99?
ST57D99 is cataloged in the U.S. Government catalog under NSN 4730-00-535-2146. This indicates validated use in U.S. government and defense supply chains.
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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.