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Technical Data Sheet
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278326 — Technical Data Sheet

✓ 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 ADJUSTER,SLACK,BRAKE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.500 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-01-100-5205, 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
278326
NSN: 5310-01-100-5205
FSC: 5310
CAGE: 30076 — HYSTER-YALE GROUP, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.500 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch20
NSN5310-01-100-5205
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 278326 · 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
•
BEARING SURFACE TYPE: CHAMFERED
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 20
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL OVERALL
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH20
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
278302InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
102972InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5994882InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
25QDA21D-P17InterchangeableGOVERNMENT REGISTRY
Adjuster,slack,brake
interchangeable
278326NInterchangeableGOVERNMENT REGISTRY
Adjuster,slack,brake
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 278326?
278326 is a ADJUSTER,SLACK,BRAKE.
What parts can replace 278326?
There are 5 known substitutes for 278326: 278302, 102972, 5994882 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 278326?
278326 is cataloged in the Federal Logistics Information System under NSN 5310-01-100-5205. 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: September 2026