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C9537-6-6 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

C9537-6-6: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 8740 OVERALL, thread_class: 3A A, thread_length: 0.930 INCHES MINIMUM AND 1.069 INCHES MAXIMUM IN, fastener_length: 1.500 INCHES NOMINAL IN, special_features: 1.355 IN. LG GROOVE AND WIRE FORMSPRING HOLD OUT DEVICE IN, thread_direction: RIGHT-HAND.

This part is cataloged in the U.S. Government catalog under NSN 5306-01-051-9622, 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
C9537-6-6
NSN: 5306-01-051-9622
FSC: 5306 — Bolts
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OVERALL
thread_class3A A
thread_length0.930 INCHES MINIMUM AND 1.069 INCHES MAXIMUM IN
fastener_length1.500 INCHES NOMINAL IN
special_features1.355 IN. LG GROOVE AND WIRE FORMSPRING HOLD OUT DEVICE IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.375 INCHES IN
thread_quantity_per_inch24
thread_series_designatorACME
NSN5306-01-051-9622
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: C9537-6-6 · 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
•
WIDTH ACROSS FLATS: 0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.930 INCHES MINIMUM AND 1.069 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
FASTENER LENGTH1.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.930 INCHES MINIMUM AND 1.069 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SPECIAL FEATURES1.355 IN. LG GROOVE AND WIRE FORMSPRING HOLD OUT DEVICE IN
SURFACE TREATMENTCADMIUM OVERALL
INTERNAL DRIVE STYLEHEXAGON
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 5
120000-6-6HSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FRS319817-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ET274A6-6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5306PL1496874Reference document
Same NSN cross-reference
Reference document — Informative reference only
120000-6-6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C9537-6-6?
C9537-6-6 is a BOLT,INTERNAL WRENCHING.
What parts can replace C9537-6-6?
There are 5 known substitutes for C9537-6-6: 120000-6-6H, FRS319817-3, ET274A6-6 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C9537-6-6?
C9537-6-6 is cataloged in the U.S. Government catalog under NSN 5306-01-051-9622. 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.