Model: NAS1581C3H2P

Close Tolerance Screw

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.363 inches
Fastener Length
Between 0.472 inches and 0.502 inches
Head Style
Flat countersunk
Head Diameter
0.258 inches
Grip Diameter
Between 0.188 inches and 0.189 inches
Internal Drive Style
High-torque
Thread Diameter
0.190 inches
Grip Length
Between 0.115 inches and 0.135 inches
Thready Qty Per Inch (tpi)
32
Min. Tensile Strength (psi)
160000 pounds per square inch
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Material
Iron alloy 660
Material Specification
Ams 5731 national std/spec single material response or ams 5732 national std/spec single material response or ams 5737 national std/spec single material response or ams 5853 national std/spec single material response
Surface Treatment
Cadmium
Surface Treatment Specification
Ams qq-p-416, ty ii, cl 2 national std/spec single treatment response
Thread Series Designator
Unjf
NSN
5305-01-596-9640
Part Number
NAS1581C3H2P
Description
Screw,close Tolerance
CAGE
71379

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Part NAS1581C3H2P NSN 5305-01-596-9640

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
29294
FIIG:
A003B0
Concept No.:
App. Key:
SS
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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