PartsTable
Technical Data Sheet
PartsTable / COMPONENT / MS16997-99 3/8- 16UNC-3AX1LG
MS16997-99 3/8- 16UNC-3AX1LG ✓ 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 MS16997-99 3/8- 16UNC-3AX1LG is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-978-9394, 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
MS16997-99 3/8- 16UNC-3AX1LG
NSN: 5305-00-978-9394
FSC: 5305
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
Part NumberMS16997-99 3/8- 16UNC-3AX1LG
NSN5305-00-978-9394
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS16997-99 3/8- 16UNC-3AX1LG · 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 CLASS: 3A A
•
INTERNAL DRIVE STYLE: HEXAGON
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 6 TYPE
•
MINIMUM YIELD STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
WIDTH ACROSS FLATS: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A A
INTERNAL DRIVE STYLEHEXAGON
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA6 TYPE
MINIMUM YIELD STRENGTH130000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
WIDTH ACROSS FLATS0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
END ITEM IDENTIFICATIONHIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
803-2145518Interchangeable
interchangeable cross-reference
interchangeable
9X20SSInterchangeable
interchangeable cross-reference
interchangeable
900-1 1-2Interchangeable
interchangeable cross-reference
interchangeable
SP523Interchangeable
interchangeable cross-reference
interchangeable
23A92Interchangeable
interchangeable cross-reference
interchangeable
712847-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy MS16997-99 3/8- 16UNC-3AX1LG?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is MS16997-99 3/8- 16UNC-3AX1LG?
MS16997-99 3/8- 16UNC-3AX1LG is a MS16997-99 3/8- 16UNC-3AX1LG.
What parts can replace MS16997-99 3/8- 16UNC-3AX1LG?
There are 21 known substitutes for MS16997-99 3/8- 16UNC-3AX1LG: 803-2145518, 9X20SS, 900-1 1-2 and 18 more. Substitute compatibility should be verified for your specific system.
Is MS16997-99 3/8- 16UNC-3AX1LG still available?
MS16997-99 3/8- 16UNC-3AX1LG is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — MS16997-99 3/8- 16UNC-3AX1LG

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026