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Technical Data Sheet
PartsTable / COMPONENT / EB21
EB21 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

STRUCTURAL SECTION,SPECIAL SHAPE. Key specifications include length: 16.000 FEET MINIMUM AND 20.000 FEET MAXIMUM FT, material: ALUMINUM ALLOY 6063, shank_length: 1.000 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.781 INCHES MAXIMUM IN, heat_treatment: T-5 SOLUTION HEAT TREATED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-133-3805, 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
EB21
NSN: 5306-00-133-3805
FSC: 5306
CAGE: 65814 — TRW INC HAND TOOLS DIV TRW INDUSTRIAL PRODUCTS GROUP (USA)
SPECIFICATIONS
length16.000 FEET MINIMUM AND 20.000 FEET MAXIMUM FT
materialALUMINUM ALLOY 6063
shank_length1.000 INCHES NOMINAL IN
thread_class2A A
thread_length0.781 INCHES MAXIMUM IN
heat_treatmentT-5 SOLUTION HEAT TREATED
overall_length2.406 INCHES NOMINAL IN
style_designatorROUND, CLOSED W/SHOULDER
thread_directionRIGHT-HAND
eye_outside_width1.188 INCHES NOMINAL IN
shoulder_diameter0.469 INCHES NOMINAL IN
eye_stock_diameter0.219 INCHES NOMINAL IN
NSN5306-00-133-3805
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: EB21 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
EYE OUTSIDE WIDTH: 1.188 INCHES NOMINAL IN
•
THREAD LENGTH: 0.781 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
EYE STOCK DIAMETER: 0.219 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND, CLOSED W/SHOULDER
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
EYE OUTSIDE WIDTH1.188 INCHES NOMINAL IN
OVERALL LENGTH2.406 INCHES NOMINAL IN
THREAD LENGTH0.781 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD DIRECTIONRIGHT-HAND
EYE STOCK DIAMETER0.219 INCHES NOMINAL IN
STYLE DESIGNATORROUND, CLOSED W/SHOULDER
MATERIALSTEEL OVERALL
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
R4Interchangeable
interchangeable cross-reference
interchangeable
C94Interchangeable
interchangeable cross-reference
interchangeable
R4JInterchangeable
interchangeable cross-reference
interchangeable
EB21Interchangeable
interchangeable cross-reference
interchangeable
EB21/EXT AL6063 -T5,144INLGInterchangeable
interchangeable cross-reference
interchangeable
89021Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is EB21?
EB21 is a STRUCTURAL SECTION,SPECIAL SHAPE.
What parts can replace EB21?
There are 8 known substitutes for EB21: R4, C94, R4J and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for EB21?
EB21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-133-3805. 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: July 2026