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MS51831A201L — INSERT,SCREW THREAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS51831A201L: INSERT,SCREW THREAD.

The INSERT,SCREW THREAD is a the manufacturer industrial component. Key specifications include length: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN, material: STEEL COMP 303 OR STEEL COMP 303SE OVERALL, insert_size: 3/8-16 UNC 2A A, thread_class: 3B, thread_length: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN, style_designator: GROOVED KEYLOCK. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-948-9834, 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
MS51831A201L
NSN: 5325-00-948-9834
FSC: 5325 — Fastening Devices
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
length0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
materialSTEEL COMP 303 OR STEEL COMP 303SE OVERALL
insert_size3/8-16 UNC 2A A
thread_class3B
thread_length0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
style_designatorGROOVED KEYLOCK
thread_directionRIGHT-HAND
features_providedINDIVIDUALLY KEYED
surface_treatmentCADMIUM AND CHROMATE OVERALL
nominal_thread_size0.190 INCHES IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF)
NSN5325-00-948-9834
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51831A201L · 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
•
LENGTH: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
•
INSERT SIZE: 3/8-16 UNC 2A A
•
STYLE DESIGNATOR: GROOVED KEYLOCK
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5640 (UNS S30300)TYPE I ASSN STD 1ST MATERIAL RESPONSE AND AMS 5640 (UNS S30323)TYPE II ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
INTERNAL THREAD RELIEF DEPTH: 0.070 INCHES NOMINAL IN
•
FEATURES PROVIDED: INDIVIDUALLY KEYED
TECHNICAL CHARACTERISTICS
LENGTH0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
INSERT SIZE3/8-16 UNC 2A A
STYLE DESIGNATORGROOVED KEYLOCK
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5640 (UNS S30300)TYPE I ASSN STD 1ST MATERIAL RESPONSE AND AMS 5640 (UNS S30323)TYPE II ASSN STD 2ND MATERIAL RESPONSE OVERALL
INTERNAL THREAD RELIEF DEPTH0.070 INCHES NOMINAL IN
FEATURES PROVIDEDINDIVIDUALLY KEYED
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 3
P/ACY/01/06Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
KNHL1032JMXSYReference document
Same NSN cross-reference
Reference document — Secondary reference
NAS1395-3LReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS51831A201L?
MS51831A201L is a INSERT,SCREW THREAD.
What parts can replace MS51831A201L?
There are 3 known substitutes for MS51831A201L: P/ACY/01/06, KNHL1032JMXSY, NAS1395-3L. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51831A201L?
MS51831A201L is cataloged in the U.S. Government catalog under NSN 5325-00-948-9834. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.