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HLM78G-4 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

HLM78G-4: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_direction: RIGHT-HAND, nominal_thread_size: 4.0 INCHES IN, bearing_surface_type: CHAMFERED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-656-6380, 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
HLM78G-4
NSN: 5310-01-656-6380
FSC: 5310 — Nuts and Washers
CAGE: 73197 — HI-SHEAR CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_seriesM
thread_directionRIGHT-HAND
nominal_thread_size4.0 INCHES IN
bearing_surface_typeCHAMFERED
NSN5310-01-656-6380
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: HLM78G-4 · 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 SERIES: M
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 4.0 INCHES IN
•
MATERIAL: STEEL OVERALL
•
BEARING SURFACE TYPE: CHAMFERED
TECHNICAL CHARACTERISTICS
THREAD SERIESM
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE4.0 INCHES IN
MATERIALSTEEL OVERALL
BEARING SURFACE TYPECHAMFERED
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 1
HLM78Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HLM78G-4?
HLM78G-4 is a NUT,PLAIN,HEXAGON.
What parts can replace HLM78G-4?
There is 1 known substitute for HLM78G-4: HLM78. Substitute compatibility should be verified for your specific system.
What is the NSN for HLM78G-4?
HLM78G-4 is cataloged in the U.S. Government catalog under NSN 5310-01-656-6380. 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.