4AX25

View detailed technical data, stock status, and sourcing information for: 4AX25

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4AX25
Federal Supply Group
Hardware and Abrasives
Federal Supply Classification
5305 Screws
National Stock Number
5305-00-018-0177
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.

hexagon head style, right-hand thread direction, 2a thread class, 1.500 inches nominal fastener length, 1.250 inches minimum thread 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
1.250 inches minimum
Fastener Length
1.500 inches nominal
Head Style
hexagon
Head Height
0.302 inches minimum and 0.323 inches maximum
Width Between Flats
0.736 inches minimum and 0.750 inches maximum
Nominal Thread Diameter
0.500 inches
Thread Quantity Per Inch
13
Minimum Tensile Strength
120000 pounds per square inch
Hardness Rating
23.0 rockwell c minimum and 30.0 rockwell c maximum overall
Material
steel overall
Surface Treatment
cadmium and chromate or zinc and chromate overall
Thread Series Designator
unc
Nondefinitive Spec/Std Data
2 type and 10p style and 5 grade

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN Name Date
5305-00-021-5678 No Name Available 01/01/1961

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
20704704 Hexagon Head Cap Screw
4AX 25 Hexagon Head Cap Screw
4AX25 Hexagon Head Cap Screw
A266500 Hexagon Head Cap Screw
AK3497 Hexagon Head Cap Screw
BCVX4KQ1 Hexagon Head Cap Screw
D9576-2-5 Hexagon Head Cap Screw
JD573 Hexagon Head Cap Screw
K-500-CH-0491 Hexagon Head Cap Screw
MS35297-113 Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-018-0177?
The FSCG of the NSN 5305-00-018-0177 is 5305
Does the NSN 5305-00-018-0177 have a Schedule B code assigned?
Yes, the Schedule B code is 7318152000
Does NSN 5305-00-018-0177 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 5305-00-018-0177 contain precious materials?
Precious metal content is unknown
Does NSN 5305-00-018-0177 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 5305-00-018-0177 was assigned to the Federal Catalog?
It was assigned 63 years ago, on Tue, Jan 1, 1963

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