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Technical Data Sheet
PartsTable / COMPONENT / D25-168
D25-168 ✓ 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 RING,PISTON is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, ring_style: CONCENTRIC, joint_style: VERTICAL JOINT, hole_diameter: 0.328 INCHES NOMINAL IN, overall_width: 0.0925 INCHES MINIMUM AND 0.0935 INCHES MAXIMUM IN, outside_diameter: 0.500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-444-6450, 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
D25-168
NSN: 5310-00-444-6450
FSC: 5310
CAGE: 31435 — LUCAS AEROSPACE POWER EQUIPMENT CORPORATION (USA)
SPECIFICATIONS
materialIRON OVERALL
ring_styleCONCENTRIC
joint_styleVERTICAL JOINT
hole_diameter0.328 INCHES NOMINAL IN
overall_width0.0925 INCHES MINIMUM AND 0.0935 INCHES MAXIMUM IN
outside_diameter0.500 INCHES NOMINAL IN
split_key_length0.125 INCHES NOMINAL IN
style_designatorKEY
surface_treatmentCHROMIUM OVERALL
material_thickness0.032 INCHES NOMINAL IN
fsc_application_dataPISTON,VALVE,REGULATING,FLUID PRESSURE
external_key_quantity3
NSN5310-00-444-6450
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: D25-168 · 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
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR AMS 5040 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
EXTERNAL TAPERED KEY WIDTH: 0.750 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.094 INCHES NOMINAL IN
•
MATERIAL: STEEL OR STEEL COMP 1010 OVERALL
•
OVERALL DISTANCE INCLUDING KEYS: 0.844 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY ANGLE: 45.0 DEGREES NOMINAL
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.316 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR AMS 5040 ASSN STD 2ND MATERIAL RESPONSE OVERALL
EXTERNAL TAPERED KEY WIDTH0.750 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.094 INCHES NOMINAL IN
MATERIALSTEEL OR STEEL COMP 1010 OVERALL
OVERALL DISTANCE INCLUDING KEYS0.844 INCHES NOMINAL IN
EXTERNAL PREBENT KEY ANGLE45.0 DEGREES NOMINAL
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.316 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN
SPLIT KEY LENGTH0.125 INCHES NOMINAL IN
MATERIAL THICKNESS0.032 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
4319-1Interchangeable
interchangeable cross-reference
interchangeable
309-0702-0000Interchangeable
interchangeable cross-reference
interchangeable
12977Interchangeable
interchangeable cross-reference
interchangeable
D25168Interchangeable
interchangeable cross-reference
interchangeable
8D18113MInterchangeable
interchangeable cross-reference
interchangeable
AA-1339Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D25-168?
D25-168 is a RING,PISTON.
What parts can replace D25-168?
There are 10 known substitutes for D25-168: 4319-1, 309-0702-0000, 12977 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D25-168?
D25-168 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-444-6450. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026