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421854 — TEST PANEL,MINIMAL INHIBITORY CO

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

421854: TEST PANEL,MINIMAL INHIBITORY CO.

TEST PANEL,MINIMAL INHIBITORY CO. Key specifications include part_name_assigned_by_controlling_agency: TEST PANEL,MINERAL INHIBITORY CONCENTRATION. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-958-0656, 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
421854
NSN: 5305-00-958-0656
NIINs: 009580656, 016696469
FSC: 5305 — Screws
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyTEST PANEL,MINERAL INHIBITORY CONCENTRATION
NSN5305-00-958-0656
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 421854 · 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
•
HEAD HEIGHT: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
SCREW SURFACE TREATMENT: CADMIUM AND CHROMATE
•
FASTENER LENGTH: 0.625 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES
•
THREAD LENGTH: 0.583 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD STYLE: PAN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
SCREW SURFACE TREATMENTCADMIUM AND CHROMATE
FASTENER LENGTH0.625 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES
THREAD LENGTH0.583 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEPAN
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
SUBSTITUTES & CROSS-REFERENCES 2
MS35207-218Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FFS92Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 421854?
421854 is a TEST PANEL,MINIMAL INHIBITORY CO.
What parts can replace 421854?
There are 2 known substitutes for 421854: MS35207-218, FFS92. Substitute compatibility should be verified for your specific system.
What is the NSN for 421854?
421854 is cataloged in the U.S. Government catalog under NSN 5305-00-958-0656. 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.