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104B438 — WASHER,SHOULDERED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

104B438: WASHER,SHOULDERED.

The WASHER,SHOULDERED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, hole_diameter: 0.437 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN, shoulder_height: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN, outside_diameter: 0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN, style_designator: SHOULDERED, shoulder_diameter: 0.518 INCHES MINIMUM AND 0.528 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-926-5891, 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
104B438
NSN: 5310-00-926-5891
FSC: 5310 — Nuts and Washers
CAGE: 10639 — AVIONICS SPECIALTIES, INC. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
hole_diameter0.437 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
shoulder_height0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
outside_diameter0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN
style_designatorSHOULDERED
shoulder_diameter0.518 INCHES MINIMUM AND 0.528 INCHES MAXIMUM IN
material_thickness0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
material_document_and_classificationZZ-R-765,CLASS 2,GRADE 60 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
NSN5310-00-926-5891
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 104B438 · 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
•
SHOULDER HEIGHT: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SHOULDERED
•
MATERIAL DOCUMENT AND CLASSIFICATION: ZZ-R-765,CLASS 2,GRADE 60 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.518 INCHES MINIMUM AND 0.528 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC OVERALL
TECHNICAL CHARACTERISTICS
SHOULDER HEIGHT0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
STYLE DESIGNATORSHOULDERED
MATERIAL DOCUMENT AND CLASSIFICATIONZZ-R-765,CLASS 2,GRADE 60 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.687 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN
MATERIAL THICKNESS0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
SHOULDER DIAMETER0.518 INCHES MINIMUM AND 0.528 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
MATERIALRUBBER SYNTHETIC OVERALL
HOLE DIAMETER0.437 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
104-438Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 104B438?
104B438 is a WASHER,SHOULDERED.
What parts can replace 104B438?
There is 1 known substitute for 104B438: 104-438. Substitute compatibility should be verified for your specific system.
What is the NSN for 104B438?
104B438 is cataloged in the U.S. Government catalog under NSN 5310-00-926-5891. 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.