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121540 — SWITCH,ROTARY

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

121540: SWITCH,ROTARY.

The SWITCH,ROTARY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 268 OVERALL, thickness: 0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN, head_style: ROUND, head_height: 0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN, shaft_length: 0.750 INCHES NOMINAL SINGLE ACTUATOR IN, thread_class: 2A SINGLE MOUNTING FACILITY A. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-206-7876, 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→ 121540
NSN: 5305-00-206-7876
NIINs: 002067876, 007616781, 008152167, 014428535
FSC: 5305 — Screws
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY 268 OVERALL
thickness0.022 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
head_styleROUND
head_height0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN
shaft_length0.750 INCHES NOMINAL SINGLE ACTUATOR IN
thread_class2A SINGLE MOUNTING FACILITY A
head_diameter0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
hole_diameter0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
overall_width1.500 INCHES NOMINAL IN
pole_quantity1 SINGLE SECTION REAR
terminal_typeQUICK DISCONNECT, MALE
thread_length0.312 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
NSN5305-00-206-7876
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121540 · 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: 0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN
•
SCREW SURFACE TREATMENT: CADMIUM OR ZINC
•
FASTENER LENGTH: 0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE
•
THREAD LENGTH: 0.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: ROUND
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.123 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN
SCREW SURFACE TREATMENTCADMIUM OR ZINC
FASTENER LENGTH0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE
THREAD LENGTH0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEROUND
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 1010 OR STEEL COMP 1020
INTERNAL DRIVE STYLESLOT
SUBSTITUTES & CROSS-REFERENCES 5
8X321Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BB8021Reference document
Same NSN cross-reference
Reference document — Secondary reference
FFS92TYPE1STYLE1SReference document
Same NSN cross-reference
Reference document — Identification reference
27063S7Reference document
Same NSN cross-reference
Reference document — Secondary reference
20481Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 121540?
121540 is a SWITCH,ROTARY. It is classified as a MRO (MRO_GENERAL).
What parts can replace 121540?
There are 5 known substitutes for 121540: 8X321, BB8021, FFS92TYPE1STYLE1S and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 121540?
121540 is cataloged in the U.S. Government catalog under NSN 5305-00-206-7876. 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.