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4172A ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

CYLINDER ASSEMBLY,HYDRAULIC BRAK. Key specifications include material: STEEL, thickness: 0.638 INCHES NOMINAL IN, bore_diameter: 1.1406 INCHES NOMINAL IN, outside_diameter: 2.000 INCHES NOMINAL IN, style_designator: PLAIN ROUND, nominal_thread_size: 0.250 INCHES SINGLE HOLE 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 5310-00-187-8661, 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
4172A
NSN: 5310-00-187-8661
FSC: 5310
CAGE: 93742 — DRS NAVAL POWER SYSTEMS INC DBA DRS POWER & CONTROL TECHNOLOGIES INC (USA)
SPECIFICATIONS
materialSTEEL
thickness0.638 INCHES NOMINAL IN
bore_diameter1.1406 INCHES NOMINAL IN
outside_diameter2.000 INCHES NOMINAL IN
style_designatorPLAIN ROUND
nominal_thread_size0.250 INCHES SINGLE HOLE IN
securing_hole_quantity1
furnished_items_and_quantity1 SETSCREW
securing_hole_type_and_locationTHREADED SINGLE HOLE
screw_thread_series_designator_and_locationSINGLE HOLE UNIFIED NATIONAL COARSE (UNC)
NSN5310-00-187-8661
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4172A · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THICKNESS: 0.062 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.750 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 1212 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.453 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.062 INCHES NOMINAL IN
OVERALL DIAMETER0.750 INCHES NOMINAL IN
MATERIALSTEEL COMP 1212 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.453 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
7351135Interchangeable
interchangeable cross-reference
interchangeable
917500Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4172A?
4172A is a CYLINDER ASSEMBLY,HYDRAULIC BRAK.
What parts can replace 4172A?
There are 2 known substitutes for 4172A: 7351135, 917500. Substitute compatibility should be verified for your specific system.
What is the NSN for 4172A?
4172A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-187-8661. 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