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255391 — TRANSFORMER,AUDIO FREQUENCY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

255391: TRANSFORMER,AUDIO FREQUENCY.

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: OVAL COUNTERSUNK, body_length: 0.500 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.340 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, thread_length: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-933-4181, 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
255391
NSN: 5305-00-933-4181
NIINs: 009334181, 010195324
FSC: 5305 — Screws
CAGE: 99592 — RAYTHEON COMPANY DBA RAYTHEON CO (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleOVAL COUNTERSUNK
body_length0.500 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.340 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_length0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
inclosure_typeFULLY INCLOSED
fastener_length0.898 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
mounting_methodTERMINAL SINGLE GROUP
special_featuresCONE POINT 60 DEG OF ANGLE BY 0.164 IN. LG IN
thread_directionRIGHT-HAND
countersink_angle81.0 DEGREES MINIMUM AND 83.0 DEGREES MAXIMUM
NSN5305-00-933-4181
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 255391 · 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
•
FASTENER LENGTH: 0.898 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: OVAL COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.898 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEOVAL COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.648 INCHES MINIMUM AND 0.676 INCHES MAXIMUM IN
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY1
SUBSTITUTES & CROSS-REFERENCES 1
6216SS1032Reference 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 255391?
255391 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace 255391?
There is 1 known substitute for 255391: 6216SS1032. Substitute compatibility should be verified for your specific system.
What is the NSN for 255391?
255391 is cataloged in the U.S. Government catalog under NSN 5305-00-933-4181. 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.