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212556 — SLEEVE,COUPLING,FLEXIBLE

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

212556: SLEEVE,COUPLING,FLEXIBLE.

The SLEEVE,COUPLING,FLEXIBLE is a the manufacturer industrial component. Key specifications include bore_shape: TAPERED BOTH ENDS, head_style: PAN NO. 2, bore_length: 2.4380 INCHES NOMINAL SECOND END IN, design_type: INTERNAL GEAR, head_height: 0.099 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN, keyway_depth: 0.2357 INCHES NOMINAL FIRST END IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-043-6758, 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
MRO→ MRO_GENERAL→ 212556
NSN: 5305-00-043-6758
NIINs: 000436758, 009772783, 010396512
FSC: 5305 — Screws
CAGE: 80009 — TEKTRONIX, INC. (USA)
SPECIFICATIONS
bore_shapeTAPERED BOTH ENDS
head_stylePAN NO. 2
bore_length2.4380 INCHES NOMINAL SECOND END IN
design_typeINTERNAL GEAR
head_height0.099 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
keyway_depth0.2357 INCHES NOMINAL FIRST END IN
keyway_width0.500 INCHES NOMINAL SECOND END IN
thread_class2A A
head_diameter0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
thread_length2.000 INCHES MAXIMUM IN
overall_length6.063 INCHES NOMINAL IN
fastener_length2.000 INCHES NOMINAL IN
NSN5305-00-043-6758
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 212556 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD HEIGHT: 0.099 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
•
SCREW SURFACE TREATMENT: CADMIUM AND CHROMATE OR CHROMATE ZINC
•
FASTENER LENGTH: 2.000 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 EXCEPT BESSEMER COMP. FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-409 GRADE 2,3 OR 4 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD LENGTH: 2.000 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: PAN NO. 2
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.099 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
SCREW SURFACE TREATMENTCADMIUM AND CHROMATE OR CHROMATE ZINC
FASTENER LENGTH2.000 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 EXCEPT BESSEMER COMP. FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-409 GRADE 2,3 OR 4 FED SPEC SINGLE MATERIAL RESPONSE
THREAD LENGTH2.000 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEPAN NO. 2
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATAI TYPE AND 9S STYLE
SCREW MATERIALSTEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1022 OR STEEL COMP 1524 OR STEEL COMP 1025 OR STEEL COMP 1527 OR STEEL COMP 1030 OR STEEL COMP 1033 OR STEEL COMP 1034 OR STEEL COMP 1035 OR STEEL COMP 1038 OR STEEL COMP 1040 OR STEEL COMP 1541 OR STEEL COMP 1108 OR STEEL COMP 1109 OR STEEL COMP 1110
SUBSTITUTES & CROSS-REFERENCES 3
MS35226-71Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5305000436758Reference document
Same NSN cross-reference
Reference document — Informative reference only
212-0556-00Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 212556?
212556 is a SLEEVE,COUPLING,FLEXIBLE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 212556?
There are 3 known substitutes for 212556: MS35226-71, 5305000436758, 212-0556-00. Substitute compatibility should be verified for your specific system.
What is the NSN for 212556?
212556 is cataloged in the U.S. Government catalog under NSN 5305-00-043-6758. 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.