PartsTable
Technical Data Sheet
421D4 ✓ 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 NUT,PLAIN,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1212 OR STEEL OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.875 INCHES NOMINAL IN, thread_class: 2B, thread_series: UN, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-208-2831, 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
421D4
NSN: 5310-00-208-2831
FSC: 5310
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1212 OR STEEL OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.875 INCHES NOMINAL IN
thread_class2B
thread_seriesUN
thread_directionRIGHT-HAND
width_across_flats2.625 INCHES NOMINAL IN
nominal_thread_size1.750 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch12
material_document_and_classificationQQ-S-637,COMP B1121 FED SPEC 1ST MATERIAL RESPONSE OR SAE 1114 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NSN5310-00-208-2831
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 421D4 · 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
THREAD QUANTITY PER INCH: 12
THREAD SERIES: UN
BEARING SURFACE TYPE: CHAMFERED
NOMINAL THREAD SIZE: 1.750 INCHES IN
WIDTH ACROSS FLATS: 2.625 INCHES NOMINAL IN
THREAD DIRECTION: RIGHT-HAND
THREAD CLASS: 2B
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-637,COMP B1121 FED SPEC 1ST MATERIAL RESPONSE OR SAE 1114 ASSN STD 2ND MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH12
THREAD SERIESUN
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE1.750 INCHES IN
WIDTH ACROSS FLATS2.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-637,COMP B1121 FED SPEC 1ST MATERIAL RESPONSE OR SAE 1114 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NUT STYLESLOTTED, HEXAGON
MATERIALSTEEL COMP 1212 OR STEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
91214Interchangeable
interchangeable cross-reference
interchangeable
CS1024641Interchangeable
interchangeable cross-reference
interchangeable
0097885Interchangeable
interchangeable cross-reference
interchangeable
8.35.507.07Interchangeable
interchangeable cross-reference
interchangeable
XR26346NInterchangeable
interchangeable cross-reference
interchangeable
74447Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 421D4?
421D4 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace 421D4?
There are 12 known substitutes for 421D4: 91214, CS1024641, 0097885 and 9 more. Substitute compatibility should be verified for your specific system.
Is 421D4 still available?
421D4 is currently cancelled.
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