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Technical Data Sheet
PartsTable / COMPONENT / 61259-429
61259-429 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,KEY is a the manufacturer industrial component. Key specifications include hole_diameter: 5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.148 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN, external_key_quantity: 19. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-186-0985, 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
61259-429
NSN: 5310-00-186-0985
FSC: 5310
CAGE: 65177 — PATTERSON PUMP CO DIV PATTERSON PUMP COMPANY (USA)
SPECIFICATIONS
hole_diameter5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.148 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
external_key_quantity19
external_prebent_key_width0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
internal_prebent_key_width0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
internal_prebent_key_length0.312 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
overall_distance_including_keys8.062 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-186-0985
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 61259-429 · 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
•
HOLE DIAMETER: 5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL: STEEL COMP 1005 OR STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1030 OR STEEL COMP 1035 OVERALL
•
EXTERNAL PREBENT KEY WIDTH: 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
INTERNAL PREBENT KEY LENGTH: 0.312 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 19
•
OVERALL DISTANCE INCLUDING KEYS: 8.062 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIALSTEEL COMP 1005 OR STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1030 OR STEEL COMP 1035 OVERALL
EXTERNAL PREBENT KEY WIDTH0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
INTERNAL PREBENT KEY LENGTH0.312 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY19
OVERALL DISTANCE INCLUDING KEYS8.062 INCHES MAXIMUM IN
OUTSIDE DIAMETER7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN
MATERIAL THICKNESS0.148 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
6135-50-100-0460Interchangeable
interchangeable cross-reference
interchangeable
W30Interchangeable
interchangeable cross-reference
interchangeable
W30BPInterchangeable
interchangeable cross-reference
interchangeable
MIL-B-43407Interchangeable
interchangeable cross-reference
interchangeable
76842Interchangeable
interchangeable cross-reference
interchangeable
CS51Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 61259-429?
61259-429 is a WASHER,KEY.
What parts can replace 61259-429?
There are 17 known substitutes for 61259-429: 6135-50-100-0460, W30, W30BP and 14 more. Substitute compatibility should be verified for your specific system.
Is 61259-429 still available?
61259-429 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026