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6-55097-18 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6-55097-18: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4340 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 1.000 INCHES MINIMUM AND 1.007 INCHES MAXIMUM IN, recess_diameter: 1.205 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN, outside_diameter: 1.600 INCHES MINIMUM AND 1.620 INCHES MAXIMUM IN, special_features: 0.075 IN. MIN 0.080 IN.

MAX RADIUS OPPOSITE SIDE RECESSED ANGLE IN. This part is cataloged in the U.S. Government catalog under NSN 5310-01-015-9893, 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
6-55097-18
NSN: 5310-01-015-9893
FSC: 5310 — Nuts and Washers
CAGE: 17765 — THE BOEING COMPANY DIV COMMERCIAL (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4340 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter1.000 INCHES MINIMUM AND 1.007 INCHES MAXIMUM IN
recess_diameter1.205 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
outside_diameter1.600 INCHES MINIMUM AND 1.620 INCHES MAXIMUM IN
special_features0.075 IN. MIN 0.080 IN. MAX RADIUS OPPOSITE SIDE RECESSED ANGLE IN
style_designatorRECESSED
material_thickness0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
minimum_tensile_strength150000 POUNDS PER SQUARE INCH LBS
material_document_and_classificationMIL-S-5626 COND D MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 COND D MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-5000 COND D MIL SPEC 3RD MATERIAL RESPONSE OVERALL
NSN5310-01-015-9893
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6-55097-18 · 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
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 COND D MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 COND D MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-5000 COND D MIL SPEC 3RD MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.600 INCHES MINIMUM AND 1.620 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
•
RECESS DIAMETER: 1.205 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
•
MINIMUM TENSILE STRENGTH: 150000 POUNDS PER SQUARE INCH LBS
•
MATERIAL: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4340 OVERALL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 COND D MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 COND D MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-5000 COND D MIL SPEC 3RD MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.600 INCHES MINIMUM AND 1.620 INCHES MAXIMUM IN
MATERIAL THICKNESS0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
RECESS DIAMETER1.205 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
SPECIAL FEATURES0.075 IN. MIN 0.080 IN. MAX RADIUS OPPOSITE SIDE RECESSED ANGLE IN
MINIMUM TENSILE STRENGTH150000 POUNDS PER SQUARE INCH LBS
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4340 OVERALL
HOLE DIAMETER1.000 INCHES MINIMUM AND 1.007 INCHES MAXIMUM IN
RECESS ANGLE90.0 DEGREES NOMINAL
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6-55097-18?
6-55097-18 is a WASHER,RECESSED.
What is the NSN for 6-55097-18?
6-55097-18 is cataloged in the U.S. Government catalog under NSN 5310-01-015-9893. 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.