3308256

View detailed technical data, stock status, and sourcing information for: 3308256

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3308256
Federal Supply Group
Hardware and Abrasives
Federal Supply Classification
5305 Screws
National Stock Number
5305-00-021-3509
Item Name Code
18257
Assigment Date
01/01/1963 (63 years ago)

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

2a thread class, 1.000 inches nominal thread length, hexagon head style, right-hand thread direction, 1.000 inches nominal fastener length

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class
2a
Thread Direction
right-hand
Thread Length
1.000 inches nominal
Fastener Length
1.000 inches nominal
Head Style
hexagon
Head Height
0.297 inches nominal
Width Between Flats
0.750 inches nominal
Nominal Thread Diameter
0.500 inches
Thread Quantity Per Inch
13
Minimum Tensile Strength
125000 pounds per square inch
Hardness Rating
25.0 rockwell c minimum and 34.0 rockwell c maximum overall
Material
steel overall
Thread Series Designator
unc
Nondefinitive Spec/Std Data
2 type and 10p style

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number Name
213509 Hexagon Head Cap Screw
3308256 Hexagon Head Cap Screw
8112GS41-20960PC9 Hexagon Head Cap Screw
SD6X407 Hexagon Head Cap Screw

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5305-00-021-3509?
The FSCG of the NSN 5305-00-021-3509 is 5305
Does the NSN 5305-00-021-3509 have a Schedule B code assigned?
Yes, the Schedule B code is 7318152000
Does NSN 5305-00-021-3509 require demilitarization?
Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.
Does NSN 5305-00-021-3509 contain precious materials?
Precious metal content is unknown
Does NSN 5305-00-021-3509 contain hazardous materials?
Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.
When the NSN 5305-00-021-3509 was assigned to the Federal Catalog?
It was assigned 63 years ago, on Tue, Jan 1, 1963

Professional Distribution

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