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S2891 ✓ 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 KEY,WOODRUFF is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1035 OVERALL, thickness: 0.188 INCHES NOMINAL IN, key_height: 0.438 INCHES NOMINAL IN, circle_diameter: 1.000 INCHES NOMINAL IN, hardness_rating: 90.7 ROCKWELL B NOMINAL OVERALL, style_designator: ROUND BOTTOM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-281-7265, 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
S2891
NSN: 5315-00-281-7265
FSC: 5315
CAGE: 13841 — TIFFIN PARTS, L.L.C. DIV SUBSIDIARY OF PETTIBONE CORP. (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OVERALL
thickness0.188 INCHES NOMINAL IN
key_height0.438 INCHES NOMINAL IN
circle_diameter1.000 INCHES NOMINAL IN
hardness_rating90.7 ROCKWELL B NOMINAL OVERALL
style_designatorROUND BOTTOM
starting_edge_shapeSTRAIGHT
key_size_designationWOODRUFF 13
material_document_and_classificationQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-281-7265
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: S2891 · 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
•
THICKNESS: 0.188 INCHES NOMINAL IN
•
CIRCLE DIAMETER: 1.000 INCHES NOMINAL IN
•
KEY HEIGHT: 0.438 INCHES NOMINAL IN
•
KEY SIZE DESIGNATION: WOODRUFF 13
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: ROUND BOTTOM
•
MATERIAL: STEEL COMP 1035 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.188 INCHES NOMINAL IN
CIRCLE DIAMETER1.000 INCHES NOMINAL IN
KEY HEIGHT0.438 INCHES NOMINAL IN
KEY SIZE DESIGNATIONWOODRUFF 13
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORROUND BOTTOM
MATERIALSTEEL COMP 1035 OVERALL
HARDNESS RATING90.7 ROCKWELL B NOMINAL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
2625-12Interchangeable
interchangeable cross-reference
interchangeable
B40Interchangeable
interchangeable cross-reference
interchangeable
937020Interchangeable
Same NIIN cross-reference
interchangeable
31956Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S2891?
S2891 is a KEY,WOODRUFF.
What parts can replace S2891?
There are 4 known substitutes for S2891: 2625-12, B40, 937020 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S2891?
S2891 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-281-7265. 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