PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 5977B
5977B ✓ 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 material: STEEL COMP 301 OVERALL, hole_diameter: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN, outside_diameter: 0.890 INCHES MINIMUM AND 0.910 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.0136 INCHES MINIMUM AND 0.0176 INCHES MAXIMUM IN, external_straight_key_width: 0.230 INCHES MINIMUM AND 0.270 INCHES MAXIMUM 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 5310-00-825-2690, 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
5977B
NSN: 5310-00-825-2690
FSC: 5310
CAGE: 05160 — MICHIGAN DYNAMICS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 301 OVERALL
hole_diameter0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
outside_diameter0.890 INCHES MINIMUM AND 0.910 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.0136 INCHES MINIMUM AND 0.0176 INCHES MAXIMUM IN
external_key_quantity1
external_straight_key_width0.230 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
overall_distance_including_keys0.940 INCHES MINIMUM AND 0.960 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-5059,ANNEALED MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-825-2690
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5977B · 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
•
OUTSIDE DIAMETER: 0.890 INCHES MINIMUM AND 0.910 INCHES MAXIMUM IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.230 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 1
•
HOLE DIAMETER: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 301 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059,ANNEALED MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: KEY
•
OVERALL DISTANCE INCLUDING KEYS: 0.940 INCHES MINIMUM AND 0.960 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.890 INCHES MINIMUM AND 0.910 INCHES MAXIMUM IN
EXTERNAL STRAIGHT KEY WIDTH0.230 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY1
HOLE DIAMETER0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
MATERIALSTEEL COMP 301 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059,ANNEALED MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORKEY
OVERALL DISTANCE INCLUDING KEYS0.940 INCHES MINIMUM AND 0.960 INCHES MAXIMUM IN
MATERIAL THICKNESS0.0136 INCHES MINIMUM AND 0.0176 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
5977Interchangeable
interchangeable cross-reference
interchangeable
5156117Interchangeable
interchangeable cross-reference
interchangeable
70608R91Interchangeable
interchangeable cross-reference
interchangeable
100106R91Interchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/187Interchangeable
interchangeable cross-reference
interchangeable
DMS 80034BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5977B?
5977B is a WASHER,KEY.
What parts can replace 5977B?
There are 8 known substitutes for 5977B: 5977, 5156117, 70608R91 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5977B?
5977B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-825-2690. 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