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503612 — AIR DUCT ASSEMBLY

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

503612: AIR DUCT ASSEMBLY.

The AIR DUCT ASSEMBLY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: PLATE, nut_height: 0.340 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN, nut_length: 0.976 INCHES MINIMUM AND 1.006 INCHES MAXIMUM IN, plate_width: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-959-0748, 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→ 503612
NSN: 5310-00-959-0748
NIINs: 009590748, 011016628
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_stylePLATE
nut_height0.340 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
nut_length0.976 INCHES MINIMUM AND 1.006 INCHES MAXIMUM IN
plate_width0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.055 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentSILVER OVERALL
nominal_thread_size0.190 INCHES IN
NSN5310-00-959-0748
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 503612 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
PLATE THICKNESS: 0.055 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
NUT LENGTH: 0.976 INCHES MINIMUM AND 1.006 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
PLATE WIDTH: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MOUNTING HOLE DIAMETER: 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
PLATE THICKNESS0.055 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
NUT LENGTH0.976 INCHES MINIMUM AND 1.006 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
PLATE WIDTH0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 2
754043Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ZA6634-02KReference 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 503612?
503612 is a AIR DUCT ASSEMBLY. It is classified as a MRO (MRO_GENERAL).
What parts can replace 503612?
There are 2 known substitutes for 503612: 754043, ZA6634-02K. Substitute compatibility should be verified for your specific system.
What is the NSN for 503612?
503612 is cataloged in the U.S. Government catalog under NSN 5310-00-959-0748. 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.