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121 764 — RECTIFIER ASSEMBLY,METALLIC

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

121 764: RECTIFIER ASSEMBLY,METALLIC.

The RECTIFIER ASSEMBLY,METALLIC is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.840 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN, head_diameter: 0.339 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-053-1903, 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
121 764
NSN: 5305-01-053-1903
NIINs: 010531903, 014185006, 016148582
FSC: 5305 — Screws
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.840 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.339 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
thread_length0.488 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES THREADS
fastener_length1.348 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-01-053-1903
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121 764 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
FASTENER LENGTH: 1.348 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.488 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.077 INCHES MINIMUM AND 0.082 INCHES MAXIMUM FIRST HOLE IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
FASTENER LENGTH1.348 INCHES MINIMUM AND 1.378 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.488 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.077 INCHES MINIMUM AND 0.082 INCHES MAXIMUM FIRST HOLE IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.840 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 2
GB510BR3-850Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AIC1577Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 121 764?
121 764 is a RECTIFIER ASSEMBLY,METALLIC.
What parts can replace 121 764?
There are 2 known substitutes for 121 764: GB510BR3-850, AIC1577. Substitute compatibility should be verified for your specific system.
What is the NSN for 121 764?
121 764 is cataloged in the U.S. Government catalog under NSN 5305-01-053-1903. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.