50FK640 — NUT,SELF-LOCKING,SLOTTED,HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

50FK640: NUT,SELF-LOCKING,SLOTTED,HEXAGON.

NUT,SELF-LOCKING,SLOTTED,HEXAGON. Key specifications include nut_style: SLOTTED, HEXAGON, nut_height: 0.141 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNF, locking_feature: PREVAILING TORQUE ALL METAL DESIGN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-193-6883, 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

50FK640

NSN: 5310-01-193-6883
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)

SPECIFICATIONS

nut_style	SLOTTED, HEXAGON
nut_height	0.141 INCHES MAXIMUM IN
thread_class	2B
thread_series	UNF
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
width_across_flats	0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
nominal_thread_size	0.138 INCHES IN
bearing_surface_type	FLAT
thread_quantity_per_inch	40
NSN	5310-01-193-6883

COMPONENT DIAGRAM

KEY FEATURES

•

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

•

THREAD SERIES: UNF

•

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

•

NUT STYLE: SLOTTED, HEXAGON

•

THREAD CLASS: 2B

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
THREAD SERIES	UNF
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
NUT STYLE	SLOTTED, HEXAGON
THREAD CLASS	2B
THREAD QUANTITY PER INCH	40
MATERIAL	STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 303CU OR STEEL COMP 303MA OR STEEL COMP 303PB OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 304H OVERALL

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 2

645167P640Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

525-518-9027Reference 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 50FK640?

50FK640 is a NUT,SELF-LOCKING,SLOTTED,HEXAGON.

What parts can replace 50FK640?

There are 2 known substitutes for 50FK640: 645167P640, 525-518-9027. Substitute compatibility should be verified for your specific system.

What is the NSN for 50FK640?

50FK640 is cataloged in the U.S. Government catalog under NSN 5310-01-193-6883. This indicates validated use in U.S. government and defense supply chains.

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50FK640 — NUT,SELF-LOCKING,SLOTTED,HEXAGON

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