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Technical Data Sheet
PartsTable / COMPONENT / 319M5
319M5 ✓ 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 BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL, head_style: DEE, head_height: 0.185 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.469 INCHES NOMINAL IN, thread_length: 0.594 INCHES MINIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-534-6178, 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
319M5
NSN: 5306-00-534-6178
FSC: 5306
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL
head_styleDEE
head_height0.185 INCHES NOMINAL IN
thread_class3A A
head_diameter0.469 INCHES NOMINAL IN
thread_length0.594 INCHES MINIMUM IN
fastener_length1.469 INCHES NOMINAL IN
special_features1/2 IN. RADIUS ON 3RD DIA FROM HEAD AND HEAT TREATED MFR 06853 147.P IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.312 INCHES IN
first_diameter_from_head0.312 INCHES NOMINAL IN
third_diameter_from_head0.285 INCHES NOMINAL IN
NSN5306-00-534-6178
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 319M5 · 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
•
THIRD DIAMETER FROM HEAD: 0.285 INCHES NOMINAL IN
•
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY: 4
•
MATERIAL: STEEL OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: BW-218-M FSCM 06853 MFR REF 1ST MATERIAL RESPONSE OR TS-80-B-37 FSCM 06853 MFR REF 1ST MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
FOURTH DIAMETER FROM HEAD: 0.312 INCHES NOMINAL IN
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: AS DIFFERENTIATED BY MATERIAL AND HEAD DIMENSIONS
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THIRD DIAMETER FROM HEAD0.285 INCHES NOMINAL IN
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY4
MATERIALSTEEL OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONBW-218-M FSCM 06853 MFR REF 1ST MATERIAL RESPONSE OR TS-80-B-37 FSCM 06853 MFR REF 1ST MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF
FOURTH DIAMETER FROM HEAD0.312 INCHES NOMINAL IN
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY MATERIAL AND HEAD DIMENSIONS
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER0.312 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.125 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
75526Upgraded Successor
successor cross-reference
successor
202893Interchangeable
interchangeable cross-reference
interchangeable
225648Interchangeable
interchangeable cross-reference
interchangeable
A-A-59585Interchangeable
interchangeable cross-reference
interchangeable
307J24ITEM1A2Interchangeable
interchangeable cross-reference
interchangeable
AS59158Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 319M5?
319M5 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 319M5?
There are 17 known substitutes for 319M5: 75526, 202893, 225648 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 319M5?
319M5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-534-6178. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026