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124221 — RESISTOR,FIXED,COMPOSITION

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

124221: RESISTOR,FIXED,COMPOSITION.

The RESISTOR,FIXED,COMPOSITION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, head_style: FLAT CHAMFER, head_height: 0.120 INCHES NOMINAL IN, corner_shape: CHAMFERED INSIDE RIGHT CORNER, thread_class: 2A A, head_diameter: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-132-4225, 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→ 124221
NSN: 5305-00-132-4225
NIINs: 001324225, 003570826, 007951295, 009409820, 013852412, 015083767
FSC: 5305 — Screws
CAGE: 13973 — LITTON SYSTEMS INC. DIV NAVIGATION SYSTEMS DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
head_styleFLAT CHAMFER
head_height0.120 INCHES NOMINAL IN
corner_shapeCHAMFERED INSIDE RIGHT CORNER
thread_class2A A
head_diameter0.250 INCHES NOMINAL IN
thread_length0.135 INCHES MINIMUM IN
overall_length0.1834 INCHES MINIMUM AND 0.1934 INCHES MAXIMUM IN
fastener_length0.410 INCHES NOMINAL IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 29.00 ROCKWELL C MAXIMUM OVERALL
special_featuresID AND OD CONCENTRIC WITHIN 0.0020 IN. TOTAL INDICATOR READING IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
NSN5305-00-132-4225
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 124221 · 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
•
FOURTH DIAMETER FROM HEAD: 0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.120 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.410 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.135 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 0.116 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FOURTH DIAMETER FROM HEAD0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
HEAD HEIGHT0.120 INCHES NOMINAL IN
FASTENER LENGTH0.410 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.135 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER0.116 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER0.143 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 124221?
124221 is a RESISTOR,FIXED,COMPOSITION. It is classified as a MRO (MRO_GENERAL).
What is the NSN for 124221?
124221 is cataloged in the U.S. Government catalog under NSN 5305-00-132-4225. 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.