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CTS270C-4 — WASHER,SEAL

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

CTS270C-4: WASHER,SEAL.

The WASHER,SEAL is a the manufacturer industrial component. Key specifications include hole_diameter: 0.670 INCHES MINIMUM AND 0.670 INCHES MINIMUM AND 0.730 INCHES MAXIMUM0.730 INCHES MAXIMUM IN, overall_height: 0.365 INCHES MINIMUM AND 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM0.385 INCHES MAXIMUM IN, outside_diameter: 1.365 INCHES MINIMUM AND 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM1.385 INCHES MAXIMUM IN, style_designator: CONCAVE, surface_treatment: OXIDE OVERALL, surface_treatment_document_and_classification: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-376-3574, 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
CTS270C-4
NSN: 5310-01-376-3574
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
hole_diameter0.670 INCHES MINIMUM AND 0.670 INCHES MINIMUM AND 0.730 INCHES MAXIMUM0.730 INCHES MAXIMUM IN
overall_height0.365 INCHES MINIMUM AND 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM0.385 INCHES MAXIMUM IN
outside_diameter1.365 INCHES MINIMUM AND 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM1.385 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentOXIDE OVERALL
surface_treatment_document_and_classificationMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-376-3574
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: CTS270C-4 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: CONCAVE
•
OUTSIDE DIAMETER: 1.365 INCHES MINIMUM AND 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM1.385 INCHES MAXIMUM IN
•
SURFACE TREATMENT: OXIDE OVERALL
•
HOLE DIAMETER: 0.670 INCHES MINIMUM AND 0.670 INCHES MINIMUM AND 0.730 INCHES MAXIMUM0.730 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.365 INCHES MINIMUM AND 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM0.385 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORCONCAVE
OUTSIDE DIAMETER1.365 INCHES MINIMUM AND 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM1.385 INCHES MAXIMUM IN
SURFACE TREATMENTOXIDE OVERALL
HOLE DIAMETER0.670 INCHES MINIMUM AND 0.670 INCHES MINIMUM AND 0.730 INCHES MAXIMUM0.730 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is CTS270C-4?
CTS270C-4 is a WASHER,SEAL.
What is the NSN for CTS270C-4?
CTS270C-4 is cataloged in the U.S. Government catalog under NSN 5310-01-376-3574. 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.