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PBF1263-4D26M — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

PBF1263-4D26M: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: DISHED HEXAGON, head_height: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.415 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-239-0634, 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
PBF1263-4D26M
NSN: 5306-01-239-0634
FSC: 5306 — Bolts
CAGE: 27624 — SPS TECHNOLOGIES LLC DBA PB FASTENERS DIV PB FASTENERS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleDISHED HEXAGON
head_height0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
thread_class3A A
thread_length0.415 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
shoulder_length1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
width_between_flats0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
NSN5306-01-239-0634
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: PBF1263-4D26M · 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: 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.415 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
SHANK UNTHREADED HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM ALL HOLES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM IN
FASTENER LENGTH2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
SHOULDER LENGTH1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.415 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM ALL HOLES IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
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 3
VS3251-4D26MReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
S11-1065-4D26MSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M494-4D26MSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 PBF1263-4D26M?
PBF1263-4D26M is a BOLT,SHOULDER.
What parts can replace PBF1263-4D26M?
There are 3 known substitutes for PBF1263-4D26M: VS3251-4D26M, S11-1065-4D26M, ST3M494-4D26M. Substitute compatibility should be verified for your specific system.
What is the NSN for PBF1263-4D26M?
PBF1263-4D26M is cataloged in the U.S. Government catalog under NSN 5306-01-239-0634. 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.