59-FX-640 — NUT,SELF-LOCKING,SLOTTED,HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

59-FX-640: NUT,SELF-LOCKING,SLOTTED,HEXAGON.

NUT,SELF-LOCKING,SLOTTED,HEXAGON. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.141 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-346-0137, 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

59-FX-640

NSN: 5310-01-346-0137
FSC: 5310 — Nuts and Washers
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)

SPECIFICATIONS

material	STEEL CORROSION RESISTING OVERALL
nut_style	SLOTTED, HEXAGON
nut_height	0.141 INCHES MAXIMUM IN
thread_class	3B
thread_series	UNIFIED NATIONAL JOINT FINE (UNJF)
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
precious_material	SILVER
surface_treatment	SILVER OVERALL
width_across_flats	0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
nominal_thread_size	0.138 INCHES IN
bearing_surface_type	CHAMFERED
NSN	5310-01-346-0137

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

PRECIOUS MATERIAL: SILVER

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.138 INCHES IN

•

LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN

•

NUT HEIGHT: 0.141 INCHES MAXIMUM IN

•

SURFACE TREATMENT: SILVER OVERALL

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
PRECIOUS MATERIAL	SILVER
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.138 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT	0.141 INCHES MAXIMUM IN
SURFACE TREATMENT	SILVER OVERALL
NUT STYLE	SLOTTED, HEXAGON
THREAD CLASS	3B

OTHER ITEMS IN FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540

SUBSTITUTES & CROSS-REFERENCES 1

59-FK-640Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

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 59-FX-640?

59-FX-640 is a NUT,SELF-LOCKING,SLOTTED,HEXAGON.

What parts can replace 59-FX-640?

There is 1 known substitute for 59-FX-640: 59-FK-640. Substitute compatibility should be verified for your specific system.

What is the NSN for 59-FX-640?

59-FX-640 is cataloged in the U.S. Government catalog under NSN 5310-01-346-0137. This indicates validated use in U.S. government and defense supply chains.

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59-FX-640 — NUT,SELF-LOCKING,SLOTTED,HEXAGON

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