Model: 3M1278E3D4A

Shoulder Screw

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.425 inches
Fastener Length
Between 0.5175 inches and 0.5475 inches
Head Style
Flat countersunk
Head Diameter
Between 0.294 inches and 0.301 inches
Shoulder Diameter
0.2177 inches grip and 0.2182 inches grip
Shoulder Length
0.204 inches grip
Hole Diameter
Between 0.070 inches and 0.080 inches
Spline Minor Diameter
Between 0.1105 inches and 0.1125 inches
Spline Major Diameter
Between 0.1540 inches and 0.1560 inches
Internal Drive Style
Torx
End Application
F/a 18 e/f aircraft
Thread Diameter
0.250 inches
Hole Quantity
1
Hole Type
Drilled
Features Provided
Cetyl alcohol lubricant
Thready Qty Per Inch (tpi)
32
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Criticality Code Justification
Agav
Shoulder Shape
Round grip
Part Name Assigned By Controlling Agency
Eddie bolt aircraft
Material
Nickel alloy 718
Material Specification
Ams5662 assn standard single material response
Surface Treatment
Passivate
Surface Treatment Specification
Mil-l-87132 type 1 grade b military specification single treatment response
Thread Series Designator
Unjf
NSN
5305-01-536-4443
Part Number
3M1278E3D4A
Description
Screw,shoulder
CAGE

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below no. 10 (0.190 in.) (5 mm) nominal diameter. No. 10 (0.190 in.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use screw, externally relieved body. For items with a no. 10 (0.190 in.) (5 mm) or larger thread diameter without an inserted driver head, use bolt, shoulder. Excludes bolt, internal wrenching and screw, cap, socket head.

Part 3M1278E3D4A NSN 5305-01-536-4443

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
22846
FIIG:
A003B0
Concept No.:
App. Key:
SL
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
Y

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
096640
UFC:
50600
LTL:
70.0
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Equipment for Aircraft

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Schedule B and Export
  • Schedule B: 7508900000
  • SITC: 69975
  • End Use: Finished metal shapes
  • NAICS: 332999
  • USDA: 1

Freight Class: Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire)

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