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NAS1581C4T12

Screw, Close Tolerance

Part number
NAS1581C4T12
NSN
5305-01-603-8744
NIIN
01-603-8744
Item name
Screw, Close Tolerance
Manufacturer
National Aerospace Standards
CAGE code
80205
FSC
5305
Unit of issue
EA
DEMIL code
A

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Technical characteristics

Thread Class
3A
Thread Direction
Right-hand
Thread Length
0.403 inches nominal
Fastener Length
1.138 inches minimum and 1.168 inches maximum
Head Style
Flat countersunk
Head Diameter
0.3504 inches minimum and 0.3988 inches maximum
Grip Diameter
0.2485 inches minimum and 0.2495 inches maximum
Internal Drive Style
Offset cruciform (torque set)
Nominal Thread Diameter
0.250 inches
Grip Length
0.74 inches minimum and 0.76 inches maximum
Thread Quantity per Inch
28
Minimum Tensile Strength
3700 pounds per square inch
Countersink Angle
99.0 degrees minimum and 101.0 degrees maximum
Part Name Assigned BY Controlling Agency
Bolt, shear, 100 deg flush reduced head, offset cruciform, offset cruciform-ribbed & dt slot, 95 ksi fsu
Material
Steel corrosion resisting overall
Material Document and Classification
Cres 286 conform to AMS5731, AMS5732, AMS5737 or AMS5853 national std/spec single material response overall
Surface Treatment
Passivate overall
Surface Treatment Document and Classification
Passivate iaw AMS2700 method 1, type 2 or 8, class 1 national std/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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