PartsTable
Technical Data Sheet
175-257 ✓ 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

PARTS KIT,HYDRAULIC BRAKE MASTER. Key specifications include head_style: HEXAGON, head_height: 0.272 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.250 INCHES MAXIMUM IN, screw_material: STEEL, fastener_length: 1.250 INCHES NOMINAL 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 5305-00-017-5257, 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
175-257
NSN: 5305-00-017-5257
FSC: 5305
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
head_styleHEXAGON
head_height0.272 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
thread_class2A A
thread_length1.250 INCHES MAXIMUM IN
screw_materialSTEEL
fastener_length1.250 INCHES NOMINAL IN
hardness_rating95.5 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM
thread_directionRIGHT-HAND
width_between_flats0.612 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.438 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
NSN5305-00-017-5257
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 175-257 · 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
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
WIDTH BETWEEN FLATS: 0.612 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
SCREW MATERIAL: STEEL
THREAD CLASS: 2A A
THREAD LENGTH: 1.250 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 1 OR 2 ASSN STD SINGLE MATERIAL RESPONSE
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.250 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.612 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
SCREW MATERIALSTEEL
THREAD CLASS2A A
THREAD LENGTH1.250 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 1 OR 2 ASSN STD SINGLE MATERIAL RESPONSE
THREAD DIRECTIONRIGHT-HAND
HEAD STYLEHEXAGON
HEAD HEIGHT0.272 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
2712Interchangeable
interchangeable cross-reference
interchangeable
K71666Interchangeable
interchangeable cross-reference
interchangeable
MC459Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 175-257?
175-257 is a PARTS KIT,HYDRAULIC BRAKE MASTER.
What parts can replace 175-257?
There are 3 known substitutes for 175-257: 2712, K71666, MC459. Substitute compatibility should be verified for your specific system.
What is the NSN for 175-257?
175-257 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-017-5257. This indicates validated use in U.S. government and defense supply chains.
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