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N56 — CAP,TUBE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

N56: CAP,TUBE.

The CAP,TUBE is a the manufacturer industrial component. Key specifications include material: PAPER, nut_style: HEXAGON, nut_height: 0.250 INCHES NOMINAL IN, seat_angle: 45.0 DEGREES, thread_class: 3B INTERNAL, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the U.S.

Government catalog under NSN 5310-00-022-0065, 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
N56
NSN: 5310-00-022-0065
NIINs: 000220065, 001052478, 006012611, 007630041, 011800464
FSC: 5310 — Nuts and Washers
CAGE: 72540 — DAYTON-WALTHER CORP (USA)
SPECIFICATIONS
materialPAPER
nut_styleHEXAGON
nut_height0.250 INCHES NOMINAL IN
seat_angle45.0 DEGREES
thread_class3B INTERNAL
thread_seriesUNIFIED NATIONAL COARSE (UNC)
connection_styleFLARE
special_featuresUSED ON GLASS OR PLASTIC CONTAINERS; UNIT QTY 6
style_designatorCAP
thread_directionRIGHT-HAND INTERNAL
adhesive_locationBACK
attachment_methodPRESSURE SENSITIVE ADHESIVE
NSN5310-00-022-0065
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: N56 · 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: 0.562 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY HGT
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
NUT HEIGHT: 0.250 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.562 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY HGT
NONDEFINITIVE SPEC/STD DATAA TYPE
NUT HEIGHT0.250 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD CLASS2B
THREAD QUANTITY PER INCH18
SUBSTITUTES & CROSS-REFERENCES 2
220065Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
FFB571TYPEAReference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is N56?
N56 is a CAP,TUBE.
What parts can replace N56?
There are 2 known substitutes for N56: 220065, FFB571TYPEA. Substitute compatibility should be verified for your specific system.
What is the NSN for N56?
N56 is cataloged in the U.S. Government catalog under NSN 5310-00-022-0065. 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.