C7521-8DN25

View detailed technical data, stock status, and sourcing information for: C7521-8DN25
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-01-060-6843

Item Name Code

27851

Assigment Date

05/27/1978 (48 years ago)

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

2.080 inches minimum and 2.100 inches maximum fastener length, 0.528 inches nominal thread length, spline drive shear head head style, right-hand thread direction, 3a thread class

Product Characteristics

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

Thread Class: 3a
Thread Direction: right-hand
Thread Length: 0.528 inches nominal
Fastener Length: 2.080 inches minimum and 2.100 inches maximum
Head Style: spline drive shear head
Head Height: 0.281 inches nominal
Width Between Flats: 0.901 inches maximum
Grip Diameter: 0.4982 inches minimum and 0.4991 inches maximum
Shank Unthreaded Hole Diameter: 0.106 inches nominal first hole
Nominal Thread Diameter: 0.500 inches
Grip Length: 1.552 inches minimum and 1.572 inches maximum
Thread Quantity Per Inch: 20
Minimum Tensile Strength: 220000 pounds per square inch
Distance From Head Largest Bearing Surface To Shank Hole Center: 1.825 inches minimum and 1.845 inches maximum first hole
Special Features: dry film lube per mil-l-8937b on bearing surface of head and grip
Material: steel corrosion resisting overall
Material Document And Classification: ams6487 assn std single material response overall
Surface Treatment: cadmium threads
Surface Treatment: cadmium top of head
Surface Treatment Document And Classification: nas672 national spec single treatment response threads
Surface Treatment Document And Classification: nas672 national spec single treatment response top of head
Thread Series Designator: unjf

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
120978-8D25N	Close Tolerance Bolt
AIC596-8DN25	Close Tolerance Bolt
C7521-8DN25	Close Tolerance Bolt
H411-8DN25	Close Tolerance Bolt
PBF7521-8DN25	Close Tolerance Bolt
SF118-8DN25	Close Tolerance Bolt
VCG0009-8DN25	Close Tolerance Bolt
VS3133-8DN25	Close Tolerance Bolt

FAQs

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

What is the FSCG of the NSN 5306-01-060-6843?

The FSCG of the NSN 5306-01-060-6843 is 5306

Does the NSN 5306-01-060-6843 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-01-060-6843 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 5306-01-060-6843 contain precious materials?

Precious metal content is unknown

Does NSN 5306-01-060-6843 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 5306-01-060-6843 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Sat, May 27, 1978