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Technical Data Sheet
PartsTable / COMPONENT / 4BM028
4BM028 ✓ 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,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 1.570 INCHES MINIMUM AND 1.570 INCHES MINIMUM AND 1.575 INCHES MAXIMUM1.575 INCHES MAXIMUM IN, heat_treatment: AS FABRICATEDAS FABRICATED, outside_diameter: 2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN, material_thickness: 0.075 INCHES MINIMUM AND 0.075 INCHES MINIMUM AND 0.083 INCHES MAXIMUM0.083 INCHES MAXIMUM IN, external_keyway_width: 0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-269-6327, 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
4BM028
NSN: 5310-00-269-6327
FSC: 5310
CAGE: 62265 — VOLVO TRUCKS NORTH AMERICA, INC. DBA (FOREIGN PARENT IS VOLVO LASTVAGNAR AB, GOTEBORG, SWEDEN.) (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter1.570 INCHES MINIMUM AND 1.570 INCHES MINIMUM AND 1.575 INCHES MAXIMUM1.575 INCHES MAXIMUM IN
heat_treatmentAS FABRICATEDAS FABRICATED
outside_diameter2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
material_thickness0.075 INCHES MINIMUM AND 0.075 INCHES MINIMUM AND 0.083 INCHES MAXIMUM0.083 INCHES MAXIMUM IN
external_keyway_width0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN
external_keyway_length0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
external_keyway_quantity1010
material_document_and_classification-B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL-B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-269-6327
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4BM028 · 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: 2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
•
EXTERNAL KEYWAY WIDTH: 0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN
•
EXTERNAL KEYWAY QUANTITY: 1010
•
MATERIAL: STEEL OVERALL
•
MATERIAL THICKNESS: 0.075 INCHES MINIMUM AND 0.075 INCHES MINIMUM AND 0.083 INCHES MAXIMUM0.083 INCHES MAXIMUM IN
•
HEAT TREATMENT: AS FABRICATEDAS FABRICATED
•
MATERIAL DOCUMENT AND CLASSIFICATION: -B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL-B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
EXTERNAL KEYWAY WIDTH0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN
EXTERNAL KEYWAY QUANTITY1010
MATERIALSTEEL OVERALL
MATERIAL THICKNESS0.075 INCHES MINIMUM AND 0.075 INCHES MINIMUM AND 0.083 INCHES MAXIMUM0.083 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATEDAS FABRICATED
MATERIAL DOCUMENT AND CLASSIFICATION-B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL-B100 FSCM 43999 MFR REF SINGLE MATERIAL RESPONSE OVERALL
SPECIAL FEATURESNONE INTERNAL KEY 0.240 IN. MIN 0.245 IN. MAX W,0.117 IN. LG,LOCATED 60 DEG FROM CENTER OF A KEYWAY TO CENTER OF INTERNAL KEYNONE INTERNAL KEY 0.240 IN. MIN 0.245 IN. MAX W,0.117 IN. LG,LOCATED 60 DEG FROM CENTER OF A KEYWAY TO CENTER OF INTERNAL KEY IN
HOLE DIAMETER1.570 INCHES MINIMUM AND 1.570 INCHES MINIMUM AND 1.575 INCHES MAXIMUM1.575 INCHES MAXIMUM IN
EXTERNAL KEYWAY LENGTH0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
305002Interchangeable
interchangeable cross-reference
interchangeable
85965Interchangeable
interchangeable cross-reference
interchangeable
85965-1Interchangeable
interchangeable cross-reference
interchangeable
372-2252-020Interchangeable
interchangeable cross-reference
interchangeable
D15-548HPC192Interchangeable
interchangeable cross-reference
interchangeable
3232Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4BM028?
4BM028 is a WASHER,KEYWAY.
What parts can replace 4BM028?
There are 21 known substitutes for 4BM028: 305002, 85965, 85965-1 and 18 more. Substitute compatibility should be verified for your specific system.
Is 4BM028 still available?
4BM028 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