Model: 4257098

Thumbscrew

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
3.625 inches
Fastener Length
1.185 inches
Head Style
Thumb no. 4
Head Height
0.810 inches
Width Between Flats
1.120 inches
Point Style
Pointless
Thread Diameter
0.375 inches
Thready Qty Per Inch (tpi)
16
Color
Natural
Material
Steel
Material Specification
Astm a668 assn standard all material responses
Surface Treatment
Zinc
Surface Treatment Specification
Astm b 633 assn standard all treatment responses
Thread Series Designator
Unc
NSN
5305-01-538-8106
Part Number
4257098
Description
Thumbscrew
CAGE
80212

An externally threaded fastener whose threaded portion is of one nominal diameter. It may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. It has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. For items having wrenching facilities such as socket recess, multiple spline or slot heads, use screw (as modified) or bolt (as modified).

Part 4257098 NSN 5305-01-538-8106

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06673
FIIG:
A003B0
Concept No.:
App. Key:
SR
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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