HT271A4-13M

View detailed technical data, stock status, and sourcing information for: HT271A4-13M
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-312-0701

Item Name Code

29294

Assigment Date

12/09/1989 (36 years ago)

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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 designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

0.443 inches minimum and 0.510 inches maximum thread length, 3a thread class, 1.265 inches minimum and 1.312 inches maximum fastener length, flat countersunk undercut head style, right-hand thread direction

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: 0.443 inches minimum and 0.510 inches maximum
Fastener Length: 1.265 inches minimum and 1.312 inches maximum
Head Style: flat countersunk undercut
Head Diameter: 0.4750 inches minimum and 0.5066 inches maximum
Head Height: 0.0713 inches minimum and 0.0733 inches maximum
Grip Diameter: 0.2485 inches minimum and 0.2495 inches maximum
Internal Drive Style: high-torque
Nominal Thread Diameter: 0.250 inches
Grip Length: 0.802 inches minimum and 0.822 inches maximum
Features Provided: dry film lubricant and o ring and cetyl alcohol lubricant
Thread Quantity Per Inch: 28
Minimum Tensile Strength: 160000 pounds per square inch
Countersink Angle: 99.0 degrees minimum and 101.0 degrees maximum
Surface Finish: 32.0 microinches bearing surface of head
Surface Finish: 32.0 microinches grip
Surface Finish: 32.0 microinches threads
Special Features: fluorsilicone rubber o-ring,per mil-r-25988 ty1,cl 1,gr 70; lubricants applied on shank and threads
Material: titanium alloy uns r56400 fastener
Material Document And Classification: ams 4967 assn std single material response fastener
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
110179-4-13ASM	Close Tolerance Screw
HT271A4-13M	Close Tolerance Screw
HT8137-4-13ASM	Close Tolerance Screw
ST3M430V4-13ASM	Close Tolerance Screw

FAQs

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

What is the FSCG of the NSN 5305-01-312-0701?

The FSCG of the NSN 5305-01-312-0701 is 5305

Does the NSN 5305-01-312-0701 have a Schedule B code assigned?

Yes, the Schedule B code is 8109900000

Does NSN 5305-01-312-0701 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 5305-01-312-0701 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-312-0701 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 5305-01-312-0701 was assigned to the Federal Catalog?

It was assigned 36 years ago, on Sat, Dec 9, 1989