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HF91-L-12-E-1 — NUT,SELF-LOCKING,SPLINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

HF91-L-12-E-1: NUT,SELF-LOCKING,SPLINE.

The NUT,SELF-LOCKING,SPLINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 384 FLANGE, nut_style: SPLINE (FLOATING), nut_height: 0.278 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, nut_length: 0.635 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, pilot_length: 0.223 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-450-9830, 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
HF91-L-12-E-1
NSN: 5310-01-450-9830
FSC: 5310 — Nuts and Washers
CAGE: 0HDW7 — HUCK INTERNATIONAL, INC. DIV HUCK PRODUCTS DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 384 FLANGE
nut_styleSPLINE (FLOATING)
nut_height0.278 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
nut_length0.635 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANT
pilot_length0.223 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
pilot_diameter0.300 INCHES NOMINAL IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE FLANGE
NSN5310-01-450-9830
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: HF91-L-12-E-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
•
LUBRICATION: DRY FILM LUBRICANT
•
WIDTH ACROSS FLATS: 0.450 INCHES NOMINAL IN
•
NUT LENGTH: 0.635 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE FLANGE
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-A-493 ASSN STD 1ST MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 2ND MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 3RD MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 4TH MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 5TH MATERIAL RESPONSE FLANGE
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
WIDTH ACROSS FLATS0.450 INCHES NOMINAL IN
NUT LENGTH0.635 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE FLANGE
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-A-493 ASSN STD 1ST MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 2ND MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 3RD MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 4TH MATERIAL RESPONSE OR ASTM-A-493 ASSN STD 5TH MATERIAL RESPONSE FLANGE
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
PILOT DIAMETER0.300 INCHES NOMINAL IN
PILOT LENGTH0.223 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HF91-L-12-E-1?
HF91-L-12-E-1 is a NUT,SELF-LOCKING,SPLINE.
What is the NSN for HF91-L-12-E-1?
HF91-L-12-E-1 is cataloged in the U.S. Government catalog under NSN 5310-01-450-9830. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.