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Technical Data Sheet
PartsTable / COMPONENT / 1B8729
1B8729 ✓ 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 4130 OR STEEL COMP 8630 OR STEEL COMP 2330 OVERALL, thickness: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN, key_height: 0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN, overall_length: 1.713 INCHES MINIMUM AND 1.723 INCHES MAXIMUM IN, circle_diameter: 2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-011-7999, 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
1B8729
NSN: 5315-00-011-7999
FSC: 5315
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 2330 OVERALL
thickness0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
key_height0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
overall_length1.713 INCHES MINIMUM AND 1.723 INCHES MAXIMUM IN
circle_diameter2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorROUND BOTTOM RELIEVED ENDS
starting_edge_shapeROUND
key_size_designationWOODRUFF 26
starting_edge_radius0.010 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-624 FED SPEC ALL MATERIAL RESPONSES OR 66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-011-7999
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1B8729 · 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: STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 2330 OVERALL
•
STARTING EDGE RADIUS: 0.010 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
•
THICKNESS: 0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
•
STARTING EDGE SHAPE: ROUND
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OR 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
KEY HEIGHT: 0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
CIRCLE DIAMETER: 2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.713 INCHES MINIMUM AND 1.723 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 2330 OVERALL
STARTING EDGE RADIUS0.010 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
THICKNESS0.1875 INCHES MINIMUM AND 0.1885 INCHES MAXIMUM IN
STARTING EDGE SHAPEROUND
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC ALL MATERIAL RESPONSES OR 66 FED STD ALL MATERIAL RESPONSES OVERALL
KEY HEIGHT0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
CIRCLE DIAMETER2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
KEY SIZE DESIGNATIONWOODRUFF 26
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
433-1959Interchangeable
interchangeable cross-reference
interchangeable
96750Interchangeable
interchangeable cross-reference
interchangeable
4820003604916Interchangeable
interchangeable cross-reference
interchangeable
9433884Interchangeable
interchangeable cross-reference
interchangeable
17395Interchangeable
interchangeable cross-reference
interchangeable
88417395Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1B8729?
1B8729 is a KEY,WOODRUFF.
What parts can replace 1B8729?
There are 18 known substitutes for 1B8729: 433-1959, 96750, 4820003604916 and 15 more. Substitute compatibility should be verified for your specific system.
Is 1B8729 still available?
1B8729 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