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PHCR-512 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

PHCR-512: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: SLOTTED HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.813 INCHES NOMINAL IN, hardness_rating: 46.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-341-8788, 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
PHCR-512
NSN: 5310-01-341-8788
FSC: 5310 — Nuts and Washers
CAGE: 62554 — ALCOA GLOBAL FASTENERS, INC DBA SIMMONDS MECAERO FAS PDTS DIV SIMMONDS MECAERO FAS PDTS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleSLOTTED HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.813 INCHES NOMINAL IN
hardness_rating46.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.100 INCHES NOMINAL IN
surface_treatmentSILVER OVERALL
width_across_flats0.868 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES IN
NSN5310-01-341-8788
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: PHCR-512 · 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
•
WASHER OUTSIDE DIAMETER: 1.130 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.868 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS2410 ASSN STD SINGLE TREATMENT RESPONSE OR AMS2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 46.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.100 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.813 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER1.130 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.868 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2410 ASSN STD SINGLE TREATMENT RESPONSE OR AMS2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING46.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.100 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.750 INCHES IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 3
10122216Reference document
Same NSN cross-reference
Reference document — Informative reference only
E9925-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
3D0026-12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is PHCR-512?
PHCR-512 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace PHCR-512?
There are 3 known substitutes for PHCR-512: 10122216, E9925-12, 3D0026-12. Substitute compatibility should be verified for your specific system.
What is the NSN for PHCR-512?
PHCR-512 is cataloged in the U.S. Government catalog under NSN 5310-01-341-8788. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.