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Socket Head Cap Screw NSN 5305-01-286-7991

Item Description

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

NSN 5305-01-286-7991 NSN: 5305-01-286-7991

Features and Characteristics

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.370 inches
Fastener Length
Between 0.470 inches and 0.500 inches
Head Style
Flat chamfer
Head Diameter
Between 0.365 inches and 0.375 inches
Head Height
Between 0.244 inches and 0.250 inches
Internal Drive Style
Hexagon
Thread Diameter
0.250 inches
Width Across Flats
0.188 inches
Thready Qty Per Inch (tpi)
20
Hardness Rating
37.0 rockwell c and 45.0 rockwell c
Surface Finish
63.0 microinches grip
Part Name Assigned By Controlling Agency
Navy special project
Material
Steel uns k03104
Material Specification
Astm a574 assn standard single material response
Thread Series Designator
Unc
Nondefinitive Specification/std Data
2 type
FSC
5305 Screws
NIIN
012867991
NSN
5305012867991

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
1/4-20UNC 3A X 1/2 IN. LG.
Cage Code:
80204
Status:
A
MSDS:
Part Number:
MIL-DTL-1222
Cage Code:
81349
Status:
A
MSDS:
Part Number:
MIL-S-1222
Cage Code:
81349
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 7318152000
  • NAICS: 332722
  • SITC: 69421
  • Description: Bolts and bolts and their nuts or washers exported in the same shipment
  • End Use (Code 12110):
    Iron and steel products, other

Q & A

Frequently asked questions for NSN 5305-01-286-7991
What are the manufacturers of nsn 5305012867991?
Does this nsn 5305012867991 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5305012867991
An externally threaded fastener whose threaded portion is of one nominal diameter. the head has an internal socket or multiple spline for use with an inserted driver. a locking feature may be incorporated in the design of the head or threads. excludes items with bevel (conical) heads. see bolt, internal wrenching. excludes screw, shoulder; and screw, machine.
Does nsn 5305012867991 contain any precious metals?
No precious metal content.
Does nsn 5305012867991 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5305012867991?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
16282
FIIG:
A003B0
App. Key:
SC
Cond. Code:
1
Status:
A

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  •   On Time Delivery
  •   Certificate of Conformance
  •   Quality Inspected Parts
  •   Quality Fast Service
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