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9937-A1 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

9937-A1: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, thickness: 0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN, key_height: 0.177 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN, recess_angle: 90.0 DEGREES NOMINAL, recess_depth: 0.030 INCHES NOMINAL IN, hole_diameter: 0.809 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-062-1245, 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
9937-A1
NSN: 5315-00-062-1245
NIINs: 000621245, 000622342
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 6Z056 — CM MANUFACTURING INC DBA CM MANUFACTURING INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
thickness0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
key_height0.177 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
recess_angle90.0 DEGREES NOMINAL
recess_depth0.030 INCHES NOMINAL IN
hole_diameter0.809 INCHES NOMINAL IN
overall_height0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
overall_length0.812 INCHES NOMINAL IN
surface_finish63.0 MICROINCHES ALL SURFACES
circle_diameter1.490 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
hardness_rating34.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM
recess_diameter0.869 INCHES NOMINAL IN
NSN5315-00-062-1245
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9937-A1 · 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
•
STYLE DESIGNATOR: ROUND BOTTOM RELIEVED ENDS
•
CIRCLE DIAMETER: 1.490 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
•
KEY HEIGHT: 0.177 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL COMP 4130 OVERALL
•
THICKNESS: 0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORROUND BOTTOM RELIEVED ENDS
OVERALL LENGTH0.812 INCHES NOMINAL IN
CIRCLE DIAMETER1.490 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
KEY HEIGHT0.177 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL COMP 4130 OVERALL
THICKNESS0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
9937A31Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9937-A1?
9937-A1 is a WASHER,RECESSED.
What parts can replace 9937-A1?
There is 1 known substitute for 9937-A1: 9937A31. Substitute compatibility should be verified for your specific system.
What is the NSN for 9937-A1?
9937-A1 is cataloged in the U.S. Government catalog under NSN 5315-00-062-1245. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.