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Technical Data Sheet
PartsTable / COMPONENT / 166252-5
166252-5 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_length: 0.511 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-978-9355, 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
166252-5
NSN: 5305-00-978-9355
FSC: 5305
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_length0.511 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
fastener_length0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.156 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-978-9355
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 166252-5 · 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 STYLE: FLAT CHAMFER
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
HEAD DIAMETER: 0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
MINIMUM YIELD STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
•
FASTENER LENGTH: 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEFLAT CHAMFER
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
HEAD DIAMETER0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
MINIMUM YIELD STRENGTH130000 POUNDS PER SQUARE INCH LBS
FASTENER LENGTH0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD CLASS3A A
NONDEFINITIVE SPEC/STD DATA6 TYPE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
41-209Interchangeable
interchangeable cross-reference
interchangeable
00296Interchangeable
interchangeable cross-reference
interchangeable
2-212E515-8Interchangeable
interchangeable cross-reference
interchangeable
2-212 E515-80Interchangeable
interchangeable cross-reference
interchangeable
13207E2681FN3Interchangeable
Same NIIN cross-reference
interchangeable
FF-S-86Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 166252-5?
166252-5 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 166252-5?
There are 11 known substitutes for 166252-5: 41-209, 00296, 2-212E515-8 and 8 more. Substitute compatibility should be verified for your specific system.
Is 166252-5 still available?
166252-5 is currently cancelled.
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Last verified: July 2026