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BH1291C-06MFA — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

BH1291C-06MFA: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: HEXAGON, lubrication: DRY FILM LUBRICANT, thread_class: 3B, thread_series: UNJC, overall_height: 0.141 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-330-2347, 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
BH1291C-06MFA
NSN: 5310-01-330-2347
FSC: 5310 — Nuts and Washers
CAGE: 27238 — BRISTOL INDUSTRIES, LLC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleHEXAGON
lubricationDRY FILM LUBRICANT
thread_class3B
thread_seriesUNJC
overall_height0.141 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.010 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
width_across_flats0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
nominal_thread_size0.138 INCHES IN
NSN5310-01-330-2347
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BH1291C-06MFA · 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
•
WASHER OUTSIDE DIAMETER: 0.244 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNJC
•
WASHER THICKNESS: 0.010 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
OVERALL HEIGHT0.141 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.244 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNJC
WASHER THICKNESS0.010 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.138 INCHES 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 6
VN324D62Reference document
Same NSN cross-reference
Reference document — Secondary reference
03A153-06LReference document
Same NSN cross-reference
Reference document — Secondary reference
83963-06LSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NRH30C-06MSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VN324DH62Reference document
Same NSN cross-reference
Reference document — Secondary reference
H52766-06Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BH1291C-06MFA?
BH1291C-06MFA is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace BH1291C-06MFA?
There are 6 known substitutes for BH1291C-06MFA: VN324D62, 03A153-06L, 83963-06L and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BH1291C-06MFA?
BH1291C-06MFA is cataloged in the U.S. Government catalog under NSN 5310-01-330-2347. 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.