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PartsTable / COMPONENT / BB27156
BB27156 ✓ 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,SHOULDERED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340, thread_class: 3A NUT THREAD A, thread_length: 1.250 INCHES MINIMUM STUD THREAD IN, hardness_rating: 42.0 ROCKWELL C NOMINAL, thread_direction: RIGHT-HAND STUD THREAD, nominal_thread_size: 1.000 INCHES STUD THREAD 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 5307-00-353-2532, 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
BB27156
NSN: 5307-00-353-2532
FSC: 5307
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 4340
thread_class3A NUT THREAD A
thread_length1.250 INCHES MINIMUM STUD THREAD IN
hardness_rating42.0 ROCKWELL C NOMINAL
special_features0.062 IN. BY 45.0 DEG CHAMFER AT BOTH THREAD ENDS; 1.625 IN. DIA BY 0.125 IN. LG CHAMFER AT BOTH ENDS OF UNTHD PORTION; 0.062 IN. BY 45.0 DEG CHAMFER AT LARGE END OF TAPER PORTION IN
thread_directionRIGHT-HAND STUD THREAD
nominal_thread_size1.000 INCHES STUD THREAD IN
cotter_pin_hole_diameter0.141 INCHES NOMINAL FIRST HOLE IN
thread_quantity_per_inch14 NUT THREAD
thread_series_designatorUNS STUD THREAD
material_document_and_classificationASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A331 ASSN STD SINGLE MATERIAL RESPONSE
distance_from_cotter_pin_hole_centerline_to_nut_end0.250 INCHES NOMINAL FIRST HOLE IN
NSN5307-00-353-2532
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BB27156 · 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
•
HARDNESS RATING: 42.0 ROCKWELL C NOMINAL
•
NOMINAL THREAD SIZE: 1.000 INCHES STUD THREAD IN
•
THREAD LENGTH: 1.250 INCHES MINIMUM NUT THREAD IN
•
THREAD QUANTITY PER INCH: 14 STUD THREAD
•
THREAD CLASS: 3A NUT THREAD A
•
DISTANCE FROM COTTER PIN HOLE CENTERLINE TO NUT END: 0.250 INCHES NOMINAL FIRST HOLE IN
•
COTTER PIN HOLE DIAMETER: 0.141 INCHES NOMINAL FIRST HOLE IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING42.0 ROCKWELL C NOMINAL
NOMINAL THREAD SIZE1.000 INCHES STUD THREAD IN
THREAD LENGTH1.250 INCHES MINIMUM NUT THREAD IN
THREAD QUANTITY PER INCH14 STUD THREAD
THREAD CLASS3A NUT THREAD A
DISTANCE FROM COTTER PIN HOLE CENTERLINE TO NUT END0.250 INCHES NOMINAL FIRST HOLE IN
COTTER PIN HOLE DIAMETER0.141 INCHES NOMINAL FIRST HOLE IN
THREAD CLASS3A STUD THREAD A
THREAD QUANTITY PER INCH14 NUT THREAD
THREAD LENGTH1.250 INCHES MINIMUM STUD THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
24516-1Interchangeable
interchangeable cross-reference
interchangeable
24516Interchangeable
interchangeable cross-reference
interchangeable
2110K37Interchangeable
Same NIIN cross-reference
interchangeable
A1-2110V125Interchangeable
Same NIIN cross-reference
interchangeable
414D4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BB27156?
BB27156 is a STUD,SHOULDERED.
What parts can replace BB27156?
There are 5 known substitutes for BB27156: 24516-1, 24516, 2110K37 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BB27156?
BB27156 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-353-2532. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026