491206C1

View detailed technical data, stock status, and sourcing information for: 491206C1
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5306 Bolts

National Stock Number

5306-01-181-1561

Item Name Code

16014

Assigment Date

06/07/1984 (42 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.

flat chamfer head style, 0.320 inches maximum thread length, right-hand thread direction, 3a thread class, 2.880 inches minimum and 2.910 inches maximum 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: 3a
Thread Direction: right-hand
Thread Length: 0.320 inches maximum
Fastener Length: 2.880 inches minimum and 2.910 inches maximum
Head Style: flat chamfer
Head Diameter: 1.190 inches minimum and 1.310 inches maximum
Head Height: 0.310 inches minimum and 0.340 inches maximum
Shoulder Diameter: 0.783 inches minimum and 0.786 inches maximum first shoulder
Shoulder Length: 1.470 inches minimum and 1.500 inches maximum first shoulder
Rib Major Diameter: 0.810 inches minimum and 0.820 inches maximum
Rib Length: 0.500 inches nominal
Distance From Largest Diameter Of Bearing Surface Of Head To Ribs: 0.060 inches nominal
Rib Quantity: 36
Nominal Thread Diameter: 0.750 inches
Features Provided: casehardened
Thread Quantity Per Inch: 16
Shoulder Shape: ribbed first shoulder
Material: steel comp 4427 or steel comp 8640 overall
Material Document And Classification: sae assn std all material responses overall
Thread Series Designator: unf

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
491206C1	Ribbed Shoulder Bolt
596008C1	Ribbed Shoulder Bolt
RH-49851	Ribbed Shoulder Bolt

FAQs

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

What is the FSCG of the NSN 5306-01-181-1561?

The FSCG of the NSN 5306-01-181-1561 is 5306

Does the NSN 5306-01-181-1561 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5306-01-181-1561 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 5306-01-181-1561 contain precious materials?

Item does not contain precious metal.

Does NSN 5306-01-181-1561 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 5306-01-181-1561 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Thu, Jun 7, 1984