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ST4M199C10 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST4M199C10: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 304 OVERALL, hole_diameter: 0.652 INCHES NOMINAL IN, outside_diameter: 0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN, special_features: INTERNAL KEY WITH FLAT TOP SURFACE 90 DEG FROM PREBENT EXTERNAL KEY, style_designator: KEY, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-116-5453, 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
ST4M199C10
NSN: 5310-01-116-5453
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 304 OVERALL
hole_diameter0.652 INCHES NOMINAL IN
outside_diameter0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN
special_featuresINTERNAL KEY WITH FLAT TOP SURFACE 90 DEG FROM PREBENT EXTERNAL KEY
style_designatorKEY
surface_treatmentPASSIVATE OVERALL
material_thickness0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
external_prebent_key_width0.110 INCHES NOMINAL IN
external_prebent_key_length0.050 INCHES NOMINAL IN
internal_straight_key_width0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
overall_distance_including_keys0.899 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-766,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
NSN5310-01-116-5453
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST4M199C10 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
INTERNAL STRAIGHT KEY WIDTH: 0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.295 INCHES MINIMUM AND 0.302 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.429 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY LENGTH: 0.050 INCHES NOMINAL IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.899 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.295 INCHES MINIMUM AND 0.302 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.429 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY LENGTH0.050 INCHES NOMINAL IN
OVERALL DISTANCE INCLUDING KEYS0.899 INCHES MINIMUM AND 0.915 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER0.859 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN
MATERIAL THICKNESS0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
10109303Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST4M199C10?
ST4M199C10 is a WASHER,KEY.
What parts can replace ST4M199C10?
There is 1 known substitute for ST4M199C10: 10109303. Substitute compatibility should be verified for your specific system.
What is the NSN for ST4M199C10?
ST4M199C10 is cataloged in the U.S. Government catalog under NSN 5310-01-116-5453. 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.