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H621-0103-8 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

H621-0103-8: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400 OVERALL, hole_diameter: 4.940 INCHES NOMINAL IN, surface_finish: 250.0 MICROINCHES ALL SURFACES, outside_diameter: 7.750 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.188 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-490-3220, 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
H621-0103-8
NSN: 5310-01-490-3220
FSC: 5310 — Nuts and Washers
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY 400 OVERALL
hole_diameter4.940 INCHES NOMINAL IN
surface_finish250.0 MICROINCHES ALL SURFACES
outside_diameter7.750 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.188 INCHES NOMINAL IN
peening_key_length1.125 INCHES NOMINAL IN
end_item_identificationWASP CLASS LHD,STEERING GEAR
external_straight_key_width1.250 INCHES NOMINAL IN
external_straight_key_length1.125 INCHES NOMINAL IN
overall_distance_including_keys10.000 INCHES NOMINAL IN
material_document_and_classificationQQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-490-3220
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: H621-0103-8 · 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
•
SURFACE FINISH: 250.0 MICROINCHES ALL SURFACES
•
EXTERNAL STRAIGHT KEY LENGTH: 1.125 INCHES NOMINAL IN
•
OVERALL DISTANCE INCLUDING KEYS: 10.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 7.750 INCHES NOMINAL IN
•
PEENING KEY LENGTH: 1.125 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.188 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH250.0 MICROINCHES ALL SURFACES
EXTERNAL STRAIGHT KEY LENGTH1.125 INCHES NOMINAL IN
OVERALL DISTANCE INCLUDING KEYS10.000 INCHES NOMINAL IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER7.750 INCHES NOMINAL IN
PEENING KEY LENGTH1.125 INCHES NOMINAL IN
MATERIAL THICKNESS0.188 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH1.250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONWASP CLASS LHD,STEERING GEAR
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

No substitute or cross-reference records for this part.

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 H621-0103-8?
H621-0103-8 is a WASHER,KEY.
What is the NSN for H621-0103-8?
H621-0103-8 is cataloged in the U.S. Government catalog under NSN 5310-01-490-3220. 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.