PartsTable
Technical Data Sheet
Download PDF

124D75 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

124D75: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 8735 OR STEEL COMP 4140 OVERALL, nut_style: HEXAGON, thread_class: 3B, thread_series: UNF, overall_height: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, hardness_rating: 19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-273-7776, 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
124D75
NSN: 5310-00-273-7776
FSC: 5310 — Nuts and Washers
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 8735 OR STEEL COMP 4140 OVERALL
nut_styleHEXAGON
thread_class3B
thread_seriesUNF
overall_height0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
hardness_rating19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
width_across_flats0.556 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
washer_outside_diameter0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
NSN5310-00-273-7776
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 124D75 · 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
•
WASHER OUTSIDE DIAMETER: 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.556 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
HARDNESS RATING: 19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6320 ASSN STD 1ST MATERIAL RESPONSE OR AMS 4140 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.556 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
THREAD SERIESUNF
HARDNESS RATING19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6320 ASSN STD 1ST MATERIAL RESPONSE OR AMS 4140 ASSN STD 2ND MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SUBSTITUTES & CROSS-REFERENCES 1
00144Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
Ready to buy 124D75?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 124D75?
124D75 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 124D75?
There is 1 known substitute for 124D75: 00144. Substitute compatibility should be verified for your specific system.
What is the NSN for 124D75?
124D75 is cataloged in the U.S. Government catalog under NSN 5310-00-273-7776. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 124D75

✓ 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.