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Technical Data Sheet
PartsTable / COMPONENT / D2-8881PC20
D2-8881PC20 ✓ 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: 5.191 INCHES MINIMUM AND 5.226 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 6.188 INCHES MINIMUM AND 6.233 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN, external_key_quantity: 19. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-186-0983, 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
D2-8881PC20
NSN: 5310-00-186-0983
FSC: 5310
CAGE: 73057 — USM CORP SUB OF EMHART INDUSTRIES INC FARREL CO DIV (USA)
SPECIFICATIONS
hole_diameter5.191 INCHES MINIMUM AND 5.226 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter6.188 INCHES MINIMUM AND 6.233 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
external_key_quantity19
external_prebent_key_width0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
internal_prebent_key_width0.375 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN
internal_prebent_key_length0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
overall_distance_including_keys7.031 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-186-0983
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: D2-8881PC20 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
INTERNAL PREBENT KEY LENGTH: 0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
HARDNESS RATING: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
•
EXTERNAL KEY QUANTITY: 19
•
OUTSIDE DIAMETER: 6.188 INCHES MINIMUM AND 6.233 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 7.031 INCHES MAXIMUM IN
•
HOLE DIAMETER: 5.191 INCHES MINIMUM AND 5.226 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
INTERNAL PREBENT KEY LENGTH0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
HARDNESS RATING50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
EXTERNAL KEY QUANTITY19
OUTSIDE DIAMETER6.188 INCHES MINIMUM AND 6.233 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS7.031 INCHES MAXIMUM IN
HOLE DIAMETER5.191 INCHES MINIMUM AND 5.226 INCHES MAXIMUM IN
INTERNAL PREBENT KEY WIDTH0.375 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
W26Interchangeable
interchangeable cross-reference
interchangeable
S8853-1Interchangeable
interchangeable cross-reference
interchangeable
T8601330P95Interchangeable
interchangeable cross-reference
interchangeable
A181-28Interchangeable
interchangeable cross-reference
interchangeable
C31-10084-6Interchangeable
interchangeable cross-reference
interchangeable
09200702TInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D2-8881PC20?
D2-8881PC20 is a WASHER,KEY.
What parts can replace D2-8881PC20?
There are 16 known substitutes for D2-8881PC20: W26, S8853-1, T8601330P95 and 13 more. Substitute compatibility should be verified for your specific system.
Is D2-8881PC20 still available?
D2-8881PC20 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