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ST4M178 REV D — WASHER,SPRING TENSION

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST4M178 REV D: WASHER,SPRING TENSION.

The WASHER,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 172 OVERALL, hole_diameter: 2.400 INCHES NOMINAL2.400 INCHES NOMINAL IN, overall_height: 0.307 INCHES NOMINAL0.307 INCHES NOMINAL IN, outside_diameter: 2.860 INCHES NOMINAL2.860 INCHES NOMINAL IN, special_features: ONE TAB,0.200 IN. W,ON EACH SIDE OF CENTER HOLEONE TAB,0.200 IN.

W,ON EACH SIDE OF CENTER HOLE IN, style_designator: SPRING TENSION. This part is cataloged in the U.S. Government catalog under NSN 5310-01-030-4920, 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
ST4M178 REV D
NSN: 5310-01-030-4920
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialCOPPER ALLOY 172 OVERALL
hole_diameter2.400 INCHES NOMINAL2.400 INCHES NOMINAL IN
overall_height0.307 INCHES NOMINAL0.307 INCHES NOMINAL IN
outside_diameter2.860 INCHES NOMINAL2.860 INCHES NOMINAL IN
special_featuresONE TAB,0.200 IN. W,ON EACH SIDE OF CENTER HOLEONE TAB,0.200 IN. W,ON EACH SIDE OF CENTER HOLE IN
style_designatorSPRING TENSION
surface_treatmentTIN OVERALL
material_thickness0.025 INCHES NOMINAL0.025 INCHES NOMINAL IN
material_document_and_classificationQQ-C-533,TEMPER AT FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-T-10727 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-030-4920
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST4M178 REV D · 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-T-10727 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: SPRING TENSION
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-533,TEMPER AT FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.860 INCHES NOMINAL2.860 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.025 INCHES NOMINAL0.025 INCHES NOMINAL IN
•
SURFACE TREATMENT: TIN OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.307 INCHES NOMINAL0.307 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-T-10727 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORSPRING TENSION
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-533,TEMPER AT FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.860 INCHES NOMINAL2.860 INCHES NOMINAL IN
MATERIAL THICKNESS0.025 INCHES NOMINAL0.025 INCHES NOMINAL IN
SPECIAL FEATURESONE TAB,0.200 IN. W,ON EACH SIDE OF CENTER HOLEONE TAB,0.200 IN. W,ON EACH SIDE OF CENTER HOLE IN
SURFACE TREATMENTTIN OVERALL
MATERIALCOPPER ALLOY 172 OVERALL
HOLE DIAMETER2.400 INCHES NOMINAL2.400 INCHES NOMINAL 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
ST4M178A4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 ST4M178 REV D?
ST4M178 REV D is a WASHER,SPRING TENSION.
What parts can replace ST4M178 REV D?
There is 1 known substitute for ST4M178 REV D: ST4M178A4. Substitute compatibility should be verified for your specific system.
What is the NSN for ST4M178 REV D?
ST4M178 REV D is cataloged in the U.S. Government catalog under NSN 5310-01-030-4920. 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.