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PartsTable / COMPONENT / R851PC5
R851PC5 ✓ 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,ROUND is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 903 OVERALL, nut_diameter: 3.125 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 2.000 INCHES NOMINAL IN, thread_series: UN, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-754-2021, 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
R851PC5
NSN: 5310-00-754-2021
FSC: 5310
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
materialCOPPER ALLOY 903 OVERALL
nut_diameter3.125 INCHES NOMINAL IN
thread_class2B
nut_thickness2.000 INCHES NOMINAL IN
thread_seriesUN
thread_directionRIGHT-HAND
drive_point_width0.281 INCHES NOMINAL IN
nominal_thread_size2.000 INCHES IN
counterbore_diameter2.031 INCHES NOMINAL NUT IN
drive_point_quantity2
nut_counterbore_depth0.375 INCHES NOMINAL NUT IN
hole_type_and_quantity1 TAPPED
NSN5310-00-754-2021
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R851PC5 · 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 DIRECTION: RIGHT-HAND
•
NUT DIAMETER: 3.125 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY 903 OVERALL
•
NOMINAL THREAD SIZE: 2.000 INCHES IN
•
HOLE TYPE AND QUANTITY: 1 TAPPED
•
THREAD QUANTITY PER INCH: 12
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-390,TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
COUNTERBORE DIAMETER: 2.031 INCHES NOMINAL NUT IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NUT DIAMETER3.125 INCHES NOMINAL IN
MATERIALCOPPER ALLOY 903 OVERALL
NOMINAL THREAD SIZE2.000 INCHES IN
HOLE TYPE AND QUANTITY1 TAPPED
THREAD QUANTITY PER INCH12
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-390,TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
COUNTERBORE DIAMETER2.031 INCHES NOMINAL NUT IN
NUT THICKNESS2.000 INCHES NOMINAL IN
DRIVE POINT WIDTH0.281 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
CMR04C161JODMInterchangeable
interchangeable cross-reference
interchangeable
F112Interchangeable
interchangeable cross-reference
interchangeable
MIL-PRF-39001/5Interchangeable
interchangeable cross-reference
interchangeable
F-180Interchangeable
interchangeable cross-reference
interchangeable
301833Interchangeable
interchangeable cross-reference
interchangeable
R869PC7Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R851PC5?
R851PC5 is a NUT,PLAIN,ROUND.
What parts can replace R851PC5?
There are 6 known substitutes for R851PC5: CMR04C161JODM, F112, MIL-PRF-39001/5 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R851PC5?
R851PC5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-754-2021. 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