Part Number NAS1581A4R11 Close Tolerance Screw

SKU: 5305011974650

Product Features

Internal drive ribbed

NAS1581A4R11 Close Tolerance Screw Datasheet

National aerospace standards part number NAS1581A4R11
Thread Direction:
Right-hand
Thread Length:
Between 0.378 inches and 0.428 inches
Fastener Length:
Between 1.076 inches and 1.106 inches
Head Style:
Flat countersunk
Head Diameter:
Between 0.350 inches and 0.3988 inches
Grip Diameter:
Between 0.2485 inches and 0.2495 inches
Internal Drive Style:
Offset cruciform (torque set)
Thread Diameter:
0.250 inches
Grip Length:
Between 0.678 inches and 0.698 inches
Thready Qty Per Inch (tpi):
28
Min. Tensile Strength (psi):
160000 pounds per square inch
Hardness Rating:
36.0 rockwell c and 40.0 rockwell c
Countersink Angle:
Between 99.0 degrees and 101.0 degrees
Surface Finish:
32.0 microinches grip
Surface Finish:
32.0 microinches threads
Material Specification:
MIL-S-5626 military specification 1ST material response or MIL-S-5000 military specification 2ND material response or MIL-S-6049 military specification 3RD material response
Surface Treatment Specification:
QQ-P-416, type 2, class 2 federal specification single treatment response
Specification Data:
80205-NAS1581 professional/industrial association standard
Manufacturer Cage:
80205
Trade Information:
  • Schedule B: 7318152000
  • SITC: 69421
  • End Use: Iron and steel products, other
  • NAICS: 332722
  • USDA: 1

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

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