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PartsTable / COMPONENT / 91-971
91-971 ✓ 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 NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include color: RED HOLDER, material: PLASTIC LENS, thread_class: 2A A, thread_length: 0.188 INCHES NOMINAL IN, thread_series: UNS, overall_length: 0.780 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-273-6616, 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
91-971
NSN: 5310-00-273-6616
FSC: 5310
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
colorRED HOLDER
materialPLASTIC LENS
thread_class2A A
thread_length0.188 INCHES NOMINAL IN
thread_seriesUNS
overall_length0.780 INCHES NOMINAL IN
mounting_methodTHREAD
thread_diameter0.562 INCHES IN
thread_quantity27 PER INCH
effective_length0.592 INCHES NOMINAL IN
overall_diameter0.620 INCHES NOMINAL IN
style_designatorSTOVEPIPE
NSN5310-00-273-6616
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91-971 · 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
•
THREAD CLASS: 3B
•
WIDTH ACROSS FLATS: 1.500 INCHES NOMINAL IN
•
BEARING SURFACE TYPE: WASHER FACED
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
THREAD QUANTITY PER INCH: 14
•
THREAD SERIES: UNS
•
MATERIAL: STEEL COMP 1040 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3B
WIDTH ACROSS FLATS1.500 INCHES NOMINAL IN
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE1.000 INCHES IN
THREAD QUANTITY PER INCH14
THREAD SERIESUNS
MATERIALSTEEL COMP 1040 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NUT STYLEHEXAGON
NUT HEIGHT1.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
147-10REDInterchangeable
interchangeable cross-reference
interchangeable
91-971Interchangeable
interchangeable cross-reference
interchangeable
PR4414-1 REV B PC 64Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91-971?
91-971 is a NUT,PLAIN,HEXAGON.
What parts can replace 91-971?
There are 3 known substitutes for 91-971: 147-10RED, 91-971, PR4414-1 REV B PC 64. Substitute compatibility should be verified for your specific system.
Is 91-971 still available?
91-971 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