KFN556-08 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

KFN556-08: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 8740 OR STEEL COMP E4340 NUT, nut_style: HEXAGON, thread_class: 3B, thread_series: UNJC, overall_height: 0.291 INCHES MAXIMUM IN, hardness_rating: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-225-0718, 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

KFN556-08

NSN: 5310-01-225-0718
FSC: 5310 — Nuts and Washers
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)

SPECIFICATIONS

material	STEEL COMP 8740 OR STEEL COMP E4340 NUT
nut_style	HEXAGON
thread_class	3B
thread_series	UNJC
overall_height	0.291 INCHES MAXIMUM IN
hardness_rating	39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
special_features	CETYL ALCOHOL LUBRICANT PER MIL-L-87132,TY 1,GRADE A
thread_direction	RIGHT-HAND
washer_thickness	0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
surface_treatment	CADMIUM AND CHROMATE NUT
width_across_flats	0.212 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN
NSN	5310-01-225-0718

COMPONENT DIAGRAM

KEY FEATURES

•

WASHER OUTSIDE DIAMETER: 0.313 INCHES MAXIMUM IN

•

WIDTH ACROSS FLATS: 0.212 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE NUT

•

THREAD SERIES: UNJC

•

HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM

•

WASHER THICKNESS: 0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: MIL-P-19468 MIL SPEC SINGLE MATERIAL RESPONSE WASHER

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.291 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.313 INCHES MAXIMUM IN
WIDTH ACROSS FLATS	0.212 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE NUT
THREAD SERIES	UNJC
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
WASHER THICKNESS	0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-P-19468 MIL SPEC SINGLE MATERIAL RESPONSE WASHER
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE NUT
THREAD DIRECTION	RIGHT-HAND

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

BH00529-08Reference 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 KFN556-08?

KFN556-08 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace KFN556-08?

There is 1 known substitute for KFN556-08: BH00529-08. Substitute compatibility should be verified for your specific system.

What is the NSN for KFN556-08?

KFN556-08 is cataloged in the U.S. Government catalog under NSN 5310-01-225-0718. This indicates validated use in U.S. government and defense supply chains.

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KFN556-08 — NUT,SELF-LOCKING,EXTENDED WASHER

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