PartsTable
Technical Data Sheet
MS51831CA108 ✓ 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 INSERT,SCREW THREAD is a the manufacturer industrial component. Key specifications include length: 0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN, material: IRON ALLOY 660 OVERALL, insert_size: 0.875-14 UNF 2A A, thread_class: 3B, thread_length: 0.775 INCHES NOMINAL IN, style_designator: KEYLOCK. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-371-0904, 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
MS51831CA108
NSN: 5325-01-371-0904
FSC: 5325
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
length0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
materialIRON ALLOY 660 OVERALL
insert_size0.875-14 UNF 2A A
thread_class3B
thread_length0.775 INCHES NOMINAL IN
style_designatorKEYLOCK
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.6250 INCHES IN
thread_quantity_per_inch11
thread_series_designatorUNJC
full_internal_thread_length0.775 INCHES NOMINAL IN
NSN5325-01-371-0904
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51831CA108 · 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: 11
LENGTH: 0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
THREAD SERIES DESIGNATOR: UNJC
STYLE DESIGNATOR: KEYLOCK
NOMINAL THREAD SIZE: 0.6250 INCHES IN
INTERNAL THREAD RELIEF DEPTH: 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
MATERIAL: IRON ALLOY 660 OVERALL
THREAD LENGTH: 0.775 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH11
LENGTH0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNJC
STYLE DESIGNATORKEYLOCK
NOMINAL THREAD SIZE0.6250 INCHES IN
INTERNAL THREAD RELIEF DEPTH0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
MATERIALIRON ALLOY 660 OVERALL
THREAD LENGTH0.775 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
K9905-1024Interchangeable
interchangeable cross-reference
interchangeable
MIL-I-45914Interchangeable
interchangeable cross-reference
interchangeable
KNHXH420JInterchangeable
interchangeable cross-reference
interchangeable
KNHXH420Interchangeable
interchangeable cross-reference
interchangeable
MS51830CA106Interchangeable
interchangeable cross-reference
interchangeable
MS51832-201LInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51831CA108?
MS51831CA108 is a INSERT,SCREW THREAD.
What parts can replace MS51831CA108?
There are 6 known substitutes for MS51831CA108: K9905-1024, MIL-I-45914, KNHXH420J and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51831CA108?
MS51831CA108 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-371-0904. This indicates validated use in U.S. government and defense supply chains.
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