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Technical Data Sheet
PartsTable / COMPONENT / 6253-1
6253-1 ✓ 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 VENT UNIT,RELIEF 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 NOMINAL IN, head_diameter: 1.250 INCHES NOMINAL IN, thread_length: 1.250 INCHES MINIMUM 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 5306-00-175-7483, 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
6253-1
NSN: 5306-00-175-7483
FSC: 5306
CAGE: 0W357 — PDI GROUND SUPPORT SYSTEMS, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
rib_length0.500 INCHES NOMINAL IN
head_height0.312 INCHES NOMINAL IN
head_diameter1.250 INCHES NOMINAL IN
thread_length1.250 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.125 INCHES NOMINAL IN
shoulder_length0.250 INCHES NOMINAL FIRST SHOULDER IN
rib_major_diameter0.812 INCHES NOMINAL IN
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch16
NSN5306-00-175-7483
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6253-1 · 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
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
THREAD QUANTITY PER INCH: 16
•
RIB MAJOR DIAMETER: 0.812 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
THREAD SERIES DESIGNATOR: UNF
•
SHOULDER LENGTH: 0.250 INCHES NOMINAL FIRST SHOULDER IN
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER SHAPEROUND FIRST SHOULDER
THREAD QUANTITY PER INCH16
RIB MAJOR DIAMETER0.812 INCHES NOMINAL IN
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.750 INCHES IN
THREAD SERIES DESIGNATORUNF
SHOULDER LENGTH0.250 INCHES NOMINAL FIRST SHOULDER IN
HEAD STYLEFLAT CHAMFER
THREAD LENGTH1.250 INCHES MINIMUM IN
HEAD DIAMETER1.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
E6-2108Interchangeable
interchangeable cross-reference
interchangeable
9292-6Interchangeable
interchangeable cross-reference
interchangeable
6X7927Interchangeable
interchangeable cross-reference
interchangeable
2307-271Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-15305Interchangeable
interchangeable cross-reference
interchangeable
LT4K247Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6253-1?
6253-1 is a VENT UNIT,RELIEF.
What parts can replace 6253-1?
There are 12 known substitutes for 6253-1: E6-2108, 9292-6, 6X7927 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 6253-1?
6253-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-175-7483. 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