OmniSynk Distribution Services

3M1278E4D9A

Screw, Shoulder

Part number
3M1278E4D9A
NSN
5305-01-536-4445
NIIN
01-536-4445
Item name
Screw, Shoulder
Manufacturer
Alcoa Global Fasteners Inc.
CAGE code
06950
FSC
5305
Unit of issue
EA
DEMIL code
A

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Alternate part numbers

Technical characteristics

Thread Class
3A
Thread Direction
Right-hand
Thread Length
0.425 inches nominal
Fastener Length
0.9725 inches minimum and 1.0025 inches maximum
Head Style
Flat countersunk
Head Diameter
0.388 inches minimum and 0.395 inches maximum
Shoulder Diameter
0.2802 inches minimum grip and 0.2807 inches maximum grip
Shoulder Length
0.5025 inches nominal grip
Hole Diameter
0.076 inches minimum and 0.086 inches maximum
Spline Minor Diameter
0.1105 inches minimum and 0.1125 inches maximum
Spline Major Diameter
0.1540 inches minimum and 0.1560 inches maximum
Internal Drive Style
TORX
End Item Identification
F/a 18 E/F aircraft
Nominal Thread Diameter
0.2500 inches
Hole Quantity
1
Hole Type
Drilled
Features Provided
Cetyl alcohol lubricant
Thread Quantity per Inch
28
Countersink Angle
99.0 degrees minimum and 101.0 degrees maximum
Criticality Code Justification
AGAV
Shoulder Shape
Round grip
Part Name Assigned BY Controlling Agency
Eddie bolt aircraft
Material
Nickel alloy 718 overall
Material Document and Classification
AMS5662 assn std single material response overall
Surface Treatment
Passivate overall
Surface Treatment Document and Classification
MIL-L-87132 type 1 grade B mil spec single treatment response overall
Thread Series Designator
UNJF
Catalogue data is compiled from public DLA/FLIS sources and is provided for identification. Availability, condition and certification are confirmed on quotation. OmniSynk Distribution Services is a stocking distributor.

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