PartsTable
Technical Data Sheet
BACS21S9-15A ✓ Verified by PartsTable
· BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130, thread_class: 3A NUT THREAD A, thread_length: 0.387 INCHES NOMINAL STUD THREAD IN, overall_length: 1.500 INCHES NOMINAL IN, locking_feature: RING, LOCK SERRATED, style_designator: LOCKED IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-638-2748, 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
BACS21S9-15A
NSN: 5307-00-638-2748
FSC: 5307
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130
thread_class3A NUT THREAD A
thread_length0.387 INCHES NOMINAL STUD THREAD IN
overall_length1.500 INCHES NOMINAL IN
locking_featureRING, LOCK SERRATED
style_designatorLOCKED IN
thread_directionRIGHT-HAND STUD THREAD
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.250 INCHES NUT THREAD IN
thread_pitch_diameters+0.2778 TO 0.2795 INCHES STUD THREAD IN
thread_quantity_per_inch18 STUD THREAD
thread_series_designatorUNS STUD THREAD
NSN5307-00-638-2748
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21S9-15A · 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
STYLE DESIGNATOR: LOCKED IN
THREAD DIRECTION: RIGHT-HAND NUT THREAD
THREAD QUANTITY PER INCH: 18 STUD THREAD
SURFACE TREATMENT: CADMIUM OVERALL
DISTANCE FROM SERRATED PORTION TO NUT END: 0.938 INCHES NOMINAL IN
DISTANCE FROM SERRATED PORTION TO END OF STUD THREAD: 0.176 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORLOCKED IN
THREAD DIRECTIONRIGHT-HAND NUT THREAD
OVERALL LENGTH1.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH18 STUD THREAD
SURFACE TREATMENTCADMIUM OVERALL
THREAD DIRECTIONRIGHT-HAND STUD THREAD
DISTANCE FROM SERRATED PORTION TO NUT END0.938 INCHES NOMINAL IN
DISTANCE FROM SERRATED PORTION TO END OF STUD THREAD0.176 INCHES NOMINAL IN
LOCKING FEATURERING, LOCK SERRATED
THREAD PITCH DIAMETERS+0.2778 TO 0.2795 INCHES STUD THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
12445-1Interchangeable
interchangeable cross-reference
interchangeable
3004-10Interchangeable
interchangeable cross-reference
interchangeable
917B774-1Interchangeable
interchangeable cross-reference
interchangeable
SFB101-95A14AInterchangeable
interchangeable cross-reference
interchangeable
CG124451Interchangeable
interchangeable cross-reference
interchangeable
311D894P02Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACS21S9-15A?
BACS21S9-15A is a STUD,LOCKED IN.
What parts can replace BACS21S9-15A?
There are 9 known substitutes for BACS21S9-15A: 12445-1, 3004-10, 917B774-1 and 6 more. Substitute compatibility should be verified for your specific system.
Is BACS21S9-15A still available?
BACS21S9-15A is currently cancelled.
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