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MS16997-18 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS16997-18: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.218 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN, thread_length: 0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-978-9346, 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
MS16997-18
NSN: 5305-00-978-9346
FSC: 5305 — Screws
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.218 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
thread_length0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
fastener_length0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MAXIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-978-9346
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS16997-18 · 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
•
WIDTH ACROSS FLATS: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
THREAD LENGTH: 0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
•
HARDNESS RATING: 36.0 ROCKWELL C MAXIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN
HEAD HEIGHT0.134 INCHES MINIMUM AND 0.138 INCHES MAXIMUM IN
FASTENER LENGTH0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD LENGTH0.157 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
HARDNESS RATING36.0 ROCKWELL C MAXIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.138 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
SUBSTITUTES & CROSS-REFERENCES 5
1026-11-306Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MS35459-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
324-2608-000Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS35349-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
200090-7Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS16997-18?
MS16997-18 is a SCREW,CAP,SOCKET HEAD.
What parts can replace MS16997-18?
There are 5 known substitutes for MS16997-18: 1026-11-306, MS35459-6, 324-2608-000 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS16997-18?
MS16997-18 is cataloged in the U.S. Government catalog under NSN 5305-00-978-9346. This indicates validated use in U.S. government and defense supply chains.
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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.