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BS-4 ✓ 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

The GUARD,MECHANICAL DRIVE is a the manufacturer industrial component. Key specifications include material: STEEL, duty_cycle: INTERMITTENT, temp_rating: -54.0 OPERATING CELSIUS AND 107.2 OPERATING CELSIUS, blade_length: 97.0 MILLIMETERS NOMINAL MM, winding_type: SERIES WOUND, overall_width: 1.250 INCHES IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-188-9486, 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
BS-4
NSN: 5315-00-188-9486
FSC: 5315
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
materialSTEEL
duty_cycleINTERMITTENT
temp_rating-54.0 OPERATING CELSIUS AND 107.2 OPERATING CELSIUS
blade_length97.0 MILLIMETERS NOMINAL MM
winding_typeSERIES WOUND
overall_width1.250 INCHES IN
time_interval1.0 MINUTES MAXIMUM ON AND 5.0 MINUTES MINIMUM OFF
overall_height1.250 INCHES IN
overall_length170.0 MILLIMETERS NOMINAL MM
mounting_methodFACE
style_designatorSCREWDRIVER HANDLE
enclosure_featureTOTALLY ENCLOSED
NSN5315-00-188-9486
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BS-4 · 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
•
STARTING EDGE SHAPE: STRAIGHT
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-N-894 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL: NICKEL ALLOY R-405 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STARTING EDGE SHAPESTRAIGHT
OVERALL LENGTH0.625 INCHES NOMINAL IN
OVERALL HEIGHT0.125 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-N-894 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORPLAIN
MATERIALNICKEL ALLOY R-405 OVERALL
OVERALL WIDTH0.125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
BS4Interchangeable
interchangeable cross-reference
interchangeable
0257 1317Interchangeable
interchangeable cross-reference
interchangeable
10660Interchangeable
interchangeable cross-reference
interchangeable
BS849APC10Interchangeable
Same NIIN cross-reference
interchangeable
BS984PC10Interchangeable
Same NIIN cross-reference
interchangeable
BS879PC10Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BS-4?
BS-4 is a GUARD,MECHANICAL DRIVE.
What parts can replace BS-4?
There are 13 known substitutes for BS-4: BS4, 0257 1317, 10660 and 10 more. Substitute compatibility should be verified for your specific system.
Is BS-4 still available?
BS-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026