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TW 121 — Technical Data Sheet

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— · 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 SOCKET,SOCKET WRENCH is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 4.801 INCHES MINIMUM AND 4.831 INCHES MAXIMUM IN, overall_length: 1.438 INCHES NOMINAL IN, drive_end_shape: SQUARE SINGLE END INTERNAL, outside_diameter: 5.688 INCHES MINIMUM AND 5.733 INCHES MAXIMUM IN, special_features: STANDARD LENGTH. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-00-787-4556, 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
TW 121
NSN: 5310-00-787-4556
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter4.801 INCHES MINIMUM AND 4.831 INCHES MAXIMUM IN
overall_length1.438 INCHES NOMINAL IN
drive_end_shapeSQUARE SINGLE END INTERNAL
outside_diameter5.688 INCHES MINIMUM AND 5.733 INCHES MAXIMUM IN
special_featuresSTANDARD LENGTH
style_designatorINTERNAL-INTERNAL
features_providedMANUAL TOOL
surface_treatmentCHROMIUM OVERALL
drive_surface_size0.500 INCHES NOMINAL SINGLE END IN
material_thickness0.165 INCHES NOMINAL IN
external_key_quantity19
NSN5310-00-787-4556
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: TW 121 · 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
•
INTERNAL PREBENT KEY LENGTH: 0.250 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
EXTERNAL KEY QUANTITY: 19
•
STYLE DESIGNATOR: KEY
•
HOLE DIAMETER: 4.801 INCHES MINIMUM AND 4.831 INCHES MAXIMUM IN
•
INTERNAL PREBENT KEY WIDTH: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 6.469 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 5.688 INCHES MINIMUM AND 5.733 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY LENGTH0.250 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
EXTERNAL KEY QUANTITY19
STYLE DESIGNATORKEY
HOLE DIAMETER4.801 INCHES MINIMUM AND 4.831 INCHES MAXIMUM IN
INTERNAL PREBENT KEY WIDTH0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS6.469 INCHES NOMINAL IN
OUTSIDE DIAMETER5.688 INCHES MINIMUM AND 5.733 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
MATERIAL THICKNESS0.165 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
W-124InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-DTL-13075InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MILW13075InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
W-125InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
BELCO 30 AWXInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4012InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is TW 121?
TW 121 is a SOCKET,SOCKET WRENCH.
What parts can replace TW 121?
There are 18 known substitutes for TW 121: W-124, MIL-DTL-13075, MILW13075 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for TW 121?
TW 121 is cataloged in the Federal Logistics Information System under NSN 5310-00-787-4556. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026