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Technical Data Sheet
PartsTable / COMPONENT / MS21308-1
MS21308-1 ✓ 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 WASHER,SADDLE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR IRON OVERALL, hole_diameter: 0.688 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, overall_width: 2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN, overall_length: 2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN, style_designator: SADDLE, surface_treatment: ZINC OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-197-3331, 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
MS21308-1
NSN: 5310-00-197-3331
FSC: 5310
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR IRON OVERALL
hole_diameter0.688 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
overall_width2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
overall_length2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
style_designatorSADDLE
surface_treatmentZINC OVERALL
material_thickness0.125 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
NSN5310-00-197-3331
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21308-1 · 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
•
MATERIAL: STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR IRON OVERALL
•
HOLE DIAMETER: 0.688 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-698 FED SPEC 5TH MATERIAL RESPONSE OR QQ-I-666 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
STYLE DESIGNATOR: SADDLE
•
MATERIAL THICKNESS: 0.125 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL WIDTH2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR IRON OVERALL
HOLE DIAMETER0.688 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-698 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-698 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-698 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-698 FED SPEC 5TH MATERIAL RESPONSE OR QQ-I-666 FED SPEC ALL MATERIAL RESPONSES OVERALL
OVERALL LENGTH2.375 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
STYLE DESIGNATORSADDLE
MATERIAL THICKNESS0.125 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
6822Interchangeable
interchangeable cross-reference
interchangeable
173-86Interchangeable
interchangeable cross-reference
interchangeable
D3SZ-2128-AInterchangeable
interchangeable cross-reference
interchangeable
C9AZ2128AInterchangeable
interchangeable cross-reference
interchangeable
1305-A091Interchangeable
Cartridge,caliber .22
interchangeable
SC3BA2FInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21308-1?
MS21308-1 is a WASHER,SADDLE.
What parts can replace MS21308-1?
There are 8 known substitutes for MS21308-1: 6822, 173-86, D3SZ-2128-A and 5 more. Substitute compatibility should be verified for your specific system.
Is MS21308-1 still available?
MS21308-1 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