BH788-4 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

BH788-4: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: SLOTTED HEXAGON, lubrication: DRY FILM LUBRICANT, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-116-1207, 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

BH788-4

NSN: 5310-01-116-1207
FSC: 5310 — Nuts and Washers
CAGE: 27238 — BRISTOL INDUSTRIES, LLC (USA)

SPECIFICATIONS

material	IRON ALLOY 660 OVERALL
nut_style	SLOTTED HEXAGON
lubrication	DRY FILM LUBRICANT
temp_rating	450.0 FAHRENHEIT NOMINAL DEGF
thread_class	3B
thread_series	UNIFIED NATIONAL JOINT FINE (UNJF)
overall_height	0.173 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
washer_thickness	0.020 INCHES NOMINAL IN
width_across_flats	0.306 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
nominal_thread_size	0.250 INCHES IN
NSN	5310-01-116-1207

COMPONENT DIAGRAM

KEY FEATURES

•

LUBRICATION: DRY FILM LUBRICANT

•

WASHER OUTSIDE DIAMETER: 0.420 INCHES MAXIMUM IN

•

WIDTH ACROSS FLATS: 0.306 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

TEMP RATING: 450.0 FAHRENHEIT NOMINAL DEGF

•

WASHER THICKNESS: 0.020 INCHES NOMINAL IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS5737 NATIONAL SPEC ALL MATERIAL RESPONSES OR AMS5525 NATIONAL SPEC ALL MATERIAL RESPONSES OVERALL

TECHNICAL CHARACTERISTICS

LUBRICATION	DRY FILM LUBRICANT
OVERALL HEIGHT	0.173 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.420 INCHES MAXIMUM IN
WIDTH ACROSS FLATS	0.306 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
TEMP RATING	450.0 FAHRENHEIT NOMINAL DEGF
WASHER THICKNESS	0.020 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5737 NATIONAL SPEC ALL MATERIAL RESPONSES OR AMS5525 NATIONAL SPEC ALL MATERIAL RESPONSES OVERALL
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.250 INCHES IN

SUBSTITUTES & CROSS-REFERENCES 7

MC15189Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

ST3M788-4Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

10109286Reference document

Same NSN cross-reference

Reference document — Informative reference only

E12589-4Reference document

Same NSN cross-reference

Reference document — Secondary reference

SLN206-3Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

79318CM-428Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is BH788-4?

BH788-4 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace BH788-4?

There are 7 known substitutes for BH788-4: MC15189, ST3M788-4, 10109286 and 4 more. Substitute compatibility should be verified for your specific system.

What is the NSN for BH788-4?

BH788-4 is cataloged in the U.S. Government catalog under NSN 5310-01-116-1207. This indicates validated use in U.S. government and defense supply chains.

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BH788-4 — NUT,SELF-LOCKING,EXTENDED WASHER

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