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MS16998-61 — Technical Data Sheet

✓ 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: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.457 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN, thread_length: 1.377 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System under NSN 5305-00-983-6673, 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
MS16998-61
NSN: 5305-00-983-6673
FSC: 5305
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.457 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN
thread_length1.377 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
fastener_length1.460 INCHES MINIMUM AND 1.500 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_flats0.250 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-983-6673
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS16998-61 · 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 QUANTITY PER INCH: 24
•
HEAD DIAMETER: 0.457 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 6 TYPE
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
THREAD CLASS: 3A A
•
INTERNAL DRIVE STYLE: HEXAGON
•
MINIMUM TENSILE STRENGTH: 160000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
THREAD QUANTITY PER INCH24
HEAD DIAMETER0.457 INCHES MINIMUM AND 0.468 INCHES MAXIMUM IN
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
NONDEFINITIVE SPEC/STD DATA6 TYPE
NOMINAL THREAD DIAMETER0.312 INCHES IN
THREAD CLASS3A A
INTERNAL DRIVE STYLEHEXAGON
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
HEAD STYLEFLAT CHAMFER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
1-5237InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
72-6970-551InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
714114InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
AC1056InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GM138234InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
PC138234InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS16998-61?
MS16998-61 is a SCREW,CAP,SOCKET HEAD.
What parts can replace MS16998-61?
There are 8 known substitutes for MS16998-61: 1-5237, 72-6970-551, 714114 and 5 more. Substitute compatibility should be verified for your specific system.
Is MS16998-61 still available?
MS16998-61 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: September 2026