Model: 18S03-1-1AA

Panel Screw Assembly

Special Features:

Recess plug depth is 0.179 - 0.191 inches; internal threads

Properties:

Thread Class
3b
Thread Direction
Right-hand
Fastener Length
Between 0.585 inches and 0.595 inches
Head Style
Pan
Head Diameter
Between 0.320 inches and 0.330 inches
Head Height
0.110 inches
Internal Drive Style
Hexagon
Thread Diameter
0.164 inches
Width Across Flats
Between 0.157 inches and 0.160 inches
Thready Qty Per Inch (tpi)
36
Part Name Assigned By Controlling Agency
Stud assembly plus flush
Lead Thread Quantity
Four
Material
Chromium bearing surface of head and nickel bearing surface of head and steel bearing surface of head
Material
Steel fastener
Material Specification
Ams 6322 assn standard single material response fastener
Material Specification
Astm a240 assn standard 1st material response bearing surface of head and astm a167 assn standard 2nd material response bearing surface of head and astm a666 assn standard 3rd material response bearing surface of head
Surface Treatment
Cadmium fastener
Surface Treatment
Passivate bearing surface of head
Surface Treatment Specification
Ams-qq-p-35 federal specification all treatment responses bearing surface of head
Surface Treatment Specification
Qq-p-416, ty2 cl2 federal specification all treatment responses fastener
Thread Series Designator
Unf
NSN
5305-01-553-3543
Part Number
18S03-1-1AA
Description
Screw Assembly,panel
CAGE
71286

A headed, threaded fastening device over which may be assembled; (1) a stand-off; (2) a flanged bushing with washer(s) and/or a shouldered bushing without a flange, or it may have an internally threaded sleeve that is an integral part of the screw; a washer and an externally thread self-locking bushing that is driven by an inserted driver. Attached to panel by threaded bushing or by flaring end of stand-off, or bushing. Used in conjunction with a speed nut, nut plate, or driven into a threaded hole in the item that the panel is fastened to. May be spring loaded.

Part 18S03-1-1AA NSN 5305-01-553-3543

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
33044
FIIG:
A003B0
Concept No.:
App. Key:
SU
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:
A
ESD:
A
MMAC:
CRITL:
X

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Schedule B and Export
  • Schedule B: 7318152000
  • SITC: 69421
  • End Use: Iron and steel products, other
  • NAICS: 332722
  • USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment

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