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Technical Data Sheet
PartsTable / COMPONENT / 179897
179897 ✓ 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,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.277 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.250 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN, fastener_length: 4.094 INCHES MINIMUM AND 4.156 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-022-4057, 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
179897
NSN: 5305-00-022-4057
FSC: 5305
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.277 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
thread_class2A A
thread_length1.250 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
fastener_length4.094 INCHES MINIMUM AND 4.156 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.725 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
minimum_yield_strength130000 POUNDS PER SQUARE INCH LBS
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch20
NSN5305-00-022-4057
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 179897 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 20
•
MATERIAL: STEEL OVERALL
•
FASTENER LENGTH: 4.094 INCHES MINIMUM AND 4.156 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
HEAD HEIGHT: 0.277 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH20
MATERIALSTEEL OVERALL
FASTENER LENGTH4.094 INCHES MINIMUM AND 4.156 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
HEAD HEIGHT0.277 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
MINIMUM YIELD STRENGTH130000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
FFS85TYPE2STYLE10PGRADE5Interchangeable
interchangeable cross-reference
interchangeable
S1815Interchangeable
interchangeable cross-reference
interchangeable
S4076Interchangeable
interchangeable cross-reference
interchangeable
FFS85TYPE2STYLE10PGRADE7Interchangeable
interchangeable cross-reference
interchangeable
MS51096-421Interchangeable
interchangeable cross-reference
interchangeable
FF-S-85C TY II ST 10PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 179897?
179897 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 179897?
There are 12 known substitutes for 179897: FFS85TYPE2STYLE10PGRADE5, S1815, S4076 and 9 more. Substitute compatibility should be verified for your specific system.
Is 179897 still available?
179897 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026