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1291-236 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

1291-236: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: FLAT CHAMFERFLAT CHAMFER, head_height: 0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM0.185 INCHES MAXIMUM IN, thread_class: 3A3A, head_diameter: 0.307 INCHES MINIMUM AND 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM0.317 INCHES MAXIMUM IN, thread_length: 0.630 INCHES NOMINAL0.630 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-133-6618, 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
1291-236
NSN: 5305-01-133-6618
FSC: 5305 — Screws
CAGE: 72314 — BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFERFLAT CHAMFER
head_height0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM0.185 INCHES MAXIMUM IN
thread_class3A3A
head_diameter0.307 INCHES MINIMUM AND 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM0.317 INCHES MAXIMUM IN
thread_length0.630 INCHES NOMINAL0.630 INCHES NOMINAL IN
fastener_length3.535 INCHES MINIMUM AND 3.535 INCHES MINIMUM AND 3.545 INCHES MAXIMUM3.545 INCHES MAXIMUM IN
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentOXIDE OVERALLOXIDE OVERALL
internal_drive_styleSLOTSLOT
nominal_thread_diameter0.190 INCHES0.190 INCHES IN
first_diameter_from_head0.138 INCHES MINIMUM AND 0.138 INCHES MINIMUM AND 0.148 INCHES MAXIMUM0.148 INCHES MAXIMUM IN
NSN5305-01-133-6618
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1291-236 · 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
•
HEAD HEIGHT: 0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM0.185 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.535 INCHES MINIMUM AND 3.535 INCHES MINIMUM AND 3.545 INCHES MAXIMUM3.545 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.630 INCHES NOMINAL0.630 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-764 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.138 INCHES MINIMUM AND 0.138 INCHES MINIMUM AND 0.148 INCHES MAXIMUM0.148 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES0.190 INCHES IN
•
HEAD STYLE: FLAT CHAMFERFLAT CHAMFER
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.175 INCHES MINIMUM AND 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM0.185 INCHES MAXIMUM IN
FASTENER LENGTH3.535 INCHES MINIMUM AND 3.535 INCHES MINIMUM AND 3.545 INCHES MAXIMUM3.545 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.630 INCHES NOMINAL0.630 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-764 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.138 INCHES MINIMUM AND 0.138 INCHES MINIMUM AND 0.148 INCHES MAXIMUM0.148 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES0.190 INCHES IN
HEAD STYLEFLAT CHAMFERFLAT CHAMFER
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER2.910 INCHES NOMINAL2.910 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 1291-236?
1291-236 is a SCREW,EXTERNALLY RELIEVED BODY.
What is the NSN for 1291-236?
1291-236 is cataloged in the U.S. Government catalog under NSN 5305-01-133-6618. 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.