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PartsTable / COMPONENT / B1937
B1937 ✓ 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 PIN,COTTER is a the manufacturer industrial component. Key specifications include diameter: 0.086 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN, material: STEEL COMP 302 OR STEEL COMP 304 OVERALL, point_type: EXTENDED PRONG SQUARE CUT, hardness_rating: 60.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 70.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL, style_designator: STANDARD, underloop_length: 1.125 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-241-7330, 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
B1937
NSN: 5315-00-241-7330
FSC: 5315
CAGE: K3456 — CLARK MASTS TEKSAM LTD (GBR)
SPECIFICATIONS
diameter0.086 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
materialSTEEL COMP 302 OR STEEL COMP 304 OVERALL
point_typeEXTENDED PRONG SQUARE CUT
hardness_rating60.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 70.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL
style_designatorSTANDARD
underloop_length1.125 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
end_item_identificationARMORED MULTI-PURPOSE VEHICLE (AMPV)
material_document_and_classificationASTM A493 ASSN STD ALL MATERIAL RESPONSES OVERALL
general_characteristics_item_description3/4 IN. W,84 IN. LG IN
surface_treatment_document_and_classificationASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-241-7330
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B1937 · 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
•
POINT TYPE: EXTENDED PRONG SQUARE CUT
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: STANDARD
•
UNDERLOOP LENGTH: 1.125 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A493 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
HARDNESS RATING: 60.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 70.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
POINT TYPEEXTENDED PRONG SQUARE CUT
END ITEM IDENTIFICATIONARMORED MULTI-PURPOSE VEHICLE (AMPV)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORSTANDARD
UNDERLOOP LENGTH1.125 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A493 ASSN STD ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
HARDNESS RATING60.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 70.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL
MATERIALSTEEL COMP 302 OR STEEL COMP 304 OVERALL
DIAMETER0.086 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
AN381-3-18Interchangeable
interchangeable cross-reference
interchangeable
MS24665-303Interchangeable
interchangeable cross-reference
interchangeable
AS123795Interchangeable
interchangeable cross-reference
interchangeable
30611-3-4X84INInterchangeable
interchangeable cross-reference
interchangeable
9535Interchangeable
interchangeable cross-reference
interchangeable
B 2974 TYPE CTInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1937?
B1937 is a PIN,COTTER.
What parts can replace B1937?
There are 13 known substitutes for B1937: AN381-3-18, MS24665-303, AS123795 and 10 more. Substitute compatibility should be verified for your specific system.
Is B1937 still available?
B1937 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