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Z7638-5 — NUT,SELF-LOCKING,CASTELLATED,HEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

Z7638-5: NUT,SELF-LOCKING,CASTELLATED,HEX.

NUT,SELF-LOCKING,CASTELLATED,HEX. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: CASTELLATED, HEXAGON, nut_height: 0.343 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, locking_feature: FREE-RUNNING ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-282-5796, 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
Z7638-5
NSN: 5310-01-282-5796
FSC: 5310 — Nuts and Washers
CAGE: 019L2 — ESNA, LLC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height0.343 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
locking_featureFREE-RUNNING ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.497 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch24
NSN5310-01-282-5796
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: Z7638-5 · 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
•
WIDTH ACROSS FLATS: 0.497 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
LOCKING FEATURE: FREE-RUNNING ALL METAL DESIGN
•
NUT HEIGHT: 0.343 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
NUT STYLE: CASTELLATED, HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.497 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
LOCKING FEATUREFREE-RUNNING ALL METAL DESIGN
NUT HEIGHT0.343 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
NUT STYLECASTELLATED, HEXAGON
THREAD CLASS3B
THREAD QUANTITY PER INCH24
SUBSTITUTES & CROSS-REFERENCES 1
C330-524-11Reference document
Same NSN cross-reference
Reference document — Vendor item drawing 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 Z7638-5?
Z7638-5 is a NUT,SELF-LOCKING,CASTELLATED,HEX.
What parts can replace Z7638-5?
There is 1 known substitute for Z7638-5: C330-524-11. Substitute compatibility should be verified for your specific system.
What is the NSN for Z7638-5?
Z7638-5 is cataloged in the U.S. Government catalog under NSN 5310-01-282-5796. 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.