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B11257-7 — TRANSFORMER,POWER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B11257-7: TRANSFORMER,POWER.

The TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: FLOATING SELF-LOCKING BARREL, body_width: 2.750 INCHES NOMINAL IN, nut_height: 0.625 INCHES NOMINAL IN, nut_length: 0.870 INCHES NOMINAL IN, body_height: 4.250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-035-5403, 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
B11257-7
NSN: 5310-00-035-5403
NIINs: 000355403, 002339244
FSC: 5310 — Nuts and Washers
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleFLOATING SELF-LOCKING BARREL
body_width2.750 INCHES NOMINAL IN
nut_height0.625 INCHES NOMINAL IN
nut_length0.870 INCHES NOMINAL IN
body_height4.250 INCHES MAXIMUM IN
body_length4.750 INCHES NOMINAL IN
lubricationDRY FILM LUBRICANT
nut_diameter0.778 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
inclosure_typeFULLY INCLOSED
NSN5310-00-035-5403
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B11257-7 · 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
•
NUT LENGTH: 0.870 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
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FEATURES PROVIDED: FLOATING NUT
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
NUT DIAMETER: 0.778 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
NUT LENGTH0.870 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
FEATURES PROVIDEDFLOATING NUT
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.438 INCHES IN
NUT DIAMETER0.778 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.625 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
ST3M570-7Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B11257-7?
B11257-7 is a TRANSFORMER,POWER.
What parts can replace B11257-7?
There is 1 known substitute for B11257-7: ST3M570-7. Substitute compatibility should be verified for your specific system.
What is the NSN for B11257-7?
B11257-7 is cataloged in the U.S. Government catalog under NSN 5310-00-035-5403. This indicates validated use in U.S. government and defense supply chains.
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