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20X1253 — BOLT,RIBBED SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

20X1253: BOLT,RIBBED SHOULDER.

The BOLT,RIBBED SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, rib_length: 0.500 INCHES NOMINAL IN, head_height: 0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN, head_diameter: 1.375 INCHES NOMINAL IN, thread_length: 0.906 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-448-3997, 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
20X1253
NSN: 5306-00-448-3997
FSC: 5306 — Bolts
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
rib_length0.500 INCHES NOMINAL IN
head_height0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
head_diameter1.375 INCHES NOMINAL IN
thread_length0.906 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length3.375 INCHES NOMINAL IN
shoulder_length0.312 INCHES MINIMUM AND 1.688 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.798 INCHES MINIMUM AND 0.808 INCHES MAXIMUM FIRST SHOULDER IN
rib_major_diameter0.810 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
NSN5306-00-448-3997
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 20X1253 · 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: 0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.375 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.312 INCHES MINIMUM AND 1.688 INCHES MAXIMUM FIRST SHOULDER IN
•
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS: 0.562 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 0.798 INCHES MINIMUM AND 0.808 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.906 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: T AND A DIV B14 GRADE 8 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
FASTENER LENGTH3.375 INCHES NOMINAL IN
SHOULDER LENGTH0.312 INCHES MINIMUM AND 1.688 INCHES MAXIMUM FIRST SHOULDER IN
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS0.562 INCHES NOMINAL IN
SHOULDER DIAMETER0.798 INCHES MINIMUM AND 0.808 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.906 INCHES MINIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONT AND A DIV B14 GRADE 8 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL
RIB LENGTH0.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.750 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 1
5306004483997Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 20X1253?
20X1253 is a BOLT,RIBBED SHOULDER.
What parts can replace 20X1253?
There is 1 known substitute for 20X1253: 5306004483997. Substitute compatibility should be verified for your specific system.
What is the NSN for 20X1253?
20X1253 is cataloged in the U.S. Government catalog under NSN 5306-00-448-3997. 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.