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Technical Data Sheet
PartsTable / COMPONENT / CR-23R-303/BLOX
CR-23R-303/BLOX ✓ 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 CR-23R-303/BLOX is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-388-0908, 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
CR-23R-303/BLOX
NSN: 5315-01-388-0908
FSC: 5315
CAGE: 09332 — AEROFAST INC (USA)
SPECIFICATIONS
Part NumberCR-23R-303/BLOX
NSN5315-01-388-0908
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: CR-23R-303/BLOX · 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
•
RING HANDLE DIAMETER: 1.000 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: RING HANDLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE SHANK
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL COMP 316 SPINDLE
•
SURFACE TREATMENT: OXIDE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
RING HANDLE DIAMETER1.000 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
STYLE DESIGNATORRING HANDLE
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE SHANK
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 316 SPINDLE
SURFACE TREATMENTOXIDE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A313 ASSN STD SINGLE MATERIAL RESPONSE SPINDLE
MATERIALSTEEL COMP 303 SHANK
SHANK DIAMETER0.246 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
ACTUATION TYPEPULL AND PUSH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
C4-23Interchangeable
interchangeable cross-reference
interchangeable
PMS-2000Interchangeable
interchangeable cross-reference
interchangeable
51907Interchangeable
interchangeable cross-reference
interchangeable
SA-12900Interchangeable
interchangeable cross-reference
interchangeable
BLNS4-23Interchangeable
Same NIIN cross-reference
interchangeable
12418557-002Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CR-23R-303/BLOX?
CR-23R-303/BLOX is a CR-23R-303/BLOX.
What parts can replace CR-23R-303/BLOX?
There are 8 known substitutes for CR-23R-303/BLOX: C4-23, PMS-2000, 51907 and 5 more. Substitute compatibility should be verified for your specific system.
Is CR-23R-303/BLOX still available?
CR-23R-303/BLOX 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