PartsTable
Technical Data Sheet
Download PDF

98438A030 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

98438A030: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 0.32 INCHES NOMINAL IN, hardness_rating: 34.0 ROCKWELL C NOMINAL, outside_diameter: 0.61 INCHES NOMINAL IN, special_features: SCREW SIZE:5/16 IN IN, style_designator: COUNTERSINK EXTERNAL TEETH. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-691-7100, 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
98438A030
NSN: 5310-01-691-7100
FSC: 5310 — Nuts and Washers
CAGE: 0KVE6 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter0.32 INCHES NOMINAL IN
hardness_rating34.0 ROCKWELL C NOMINAL
outside_diameter0.61 INCHES NOMINAL IN
special_featuresSCREW SIZE:5/16 IN IN
style_designatorCOUNTERSINK EXTERNAL TEETH
material_thickness0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
external_key_quantity12
part_name_assigned_by_controlling_agencyEXTERNAL TOOTH LOCK WASHER
NSN5310-01-691-7100
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 98438A030 · 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
•
HARDNESS RATING: 34.0 ROCKWELL C NOMINAL
•
STYLE DESIGNATOR: COUNTERSINK EXTERNAL TEETH
•
OUTSIDE DIAMETER: 0.61 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 12
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
HARDNESS RATING34.0 ROCKWELL C NOMINAL
STYLE DESIGNATORCOUNTERSINK EXTERNAL TEETH
OUTSIDE DIAMETER0.61 INCHES NOMINAL IN
MATERIAL THICKNESS0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY12
SPECIAL FEATURESSCREW SIZE:5/16 IN IN
PART NAME ASSIGNED BY CONTROLLING AGENCYEXTERNAL TOOTH LOCK WASHER
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER0.32 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 98438A030?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 98438A030?
98438A030 is a WASHER,LOCK.
What is the NSN for 98438A030?
98438A030 is cataloged in the U.S. Government catalog under NSN 5310-01-691-7100. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 98438A030

✓ 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.