PartsTable
Technical Data Sheet
BACS21S12-20A ✓ 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: 0.518 INCHES NOMINAL STUD THREAD IN, overall_length: 2.000 INCHES NOMINAL IN, locking_feature: ANY ACCEPTABLE, style_designator: LOCKED IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-207-5852, 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
BACS21S12-20A
NSN: 5307-00-207-5852
FSC: 5307
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130
thread_class3A NUT THREAD A
thread_length0.518 INCHES NOMINAL STUD THREAD IN
overall_length2.000 INCHES NOMINAL IN
locking_featureANY ACCEPTABLE
style_designatorLOCKED IN
thread_directionRIGHT-HAND STUD THREAD
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.438 INCHES STUD THREAD IN
thread_pitch_diameters+0.3926 TO 0.3946 INCHES STUD THREAD IN
thread_quantity_per_inch14 STUD THREAD
thread_series_designatorUNF NUT THREAD
NSN5307-00-207-5852
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21S12-20A · 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
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE
THREAD QUANTITY PER INCH: 24 NUT THREAD
LOCKING FEATURE: ANY ACCEPTABLE
THREAD SERIES DESIGNATOR: UNS STUD THREAD
NOMINAL THREAD SIZE: 0.375 INCHES NUT THREAD IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE
THREAD QUANTITY PER INCH24 NUT THREAD
LOCKING FEATUREANY ACCEPTABLE
THREAD SERIES DESIGNATORUNS STUD THREAD
NOMINAL THREAD SIZE0.375 INCHES NUT THREAD IN
THREAD QUANTITY PER INCH14 STUD THREAD
THREAD SERIES DESIGNATORUNF NUT THREAD
NOMINAL THREAD SIZE0.438 INCHES STUD THREAD IN
DISTANCE FROM SERRATED PORTION TO STUD END0.750 INCHES NOMINAL IN
STYLE DESIGNATORLOCKED IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
133728Interchangeable
interchangeable cross-reference
interchangeable
FFS92TYPE1STYLE2SInterchangeable
interchangeable cross-reference
interchangeable
FF-S-92BInterchangeable
interchangeable cross-reference
interchangeable
150026Interchangeable
interchangeable cross-reference
interchangeable
79125Interchangeable
interchangeable cross-reference
interchangeable
355405Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACS21S12-20A?
BACS21S12-20A is a STUD,LOCKED IN.
What parts can replace BACS21S12-20A?
There are 13 known substitutes for BACS21S12-20A: 133728, FFS92TYPE1STYLE2S, FF-S-92B and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BACS21S12-20A?
BACS21S12-20A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-207-5852. This indicates validated use in U.S. government and defense supply chains.
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