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PBF1270-8-27 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

PBF1270-8-27: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: SPLINE DRIVE SHEAR HEAD, head_height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-142-3541, 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
PBF1270-8-27
NSN: 5306-01-142-3541
FSC: 5306 — Bolts
CAGE: 27624 — SPS TECHNOLOGIES LLC DBA PB FASTENERS DIV PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleSPLINE DRIVE SHEAR HEAD
head_height0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
thread_class3A A
thread_length0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.321 INCHES MINIMUM AND 1.368 INCHES MAXIMUM IN
shoulder_length1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.5302 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
head_minor_diameter0.772 INCHES MINIMUM IN
NSN5306-01-142-3541
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: PBF1270-8-27 · 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: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.321 INCHES MINIMUM AND 1.368 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.5302 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
FASTENER LENGTH1.321 INCHES MINIMUM AND 1.368 INCHES MAXIMUM IN
SHOULDER LENGTH1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.5302 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLESPLINE DRIVE SHEAR HEAD
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 4
VS3191-8-27YReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
ST3M838-8-27Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MB160-8-27Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
122898-8-27Same 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 PBF1270-8-27?
PBF1270-8-27 is a BOLT,SHOULDER.
What parts can replace PBF1270-8-27?
There are 4 known substitutes for PBF1270-8-27: VS3191-8-27Y, ST3M838-8-27, MB160-8-27 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PBF1270-8-27?
PBF1270-8-27 is cataloged in the U.S. Government catalog under NSN 5306-01-142-3541. 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.