68A690879-2015/2017/2019

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5340 Commercial Hardware

National Stock Number

5340-01-257-5231

Item Name Code

37415

Assigment Date

06/20/1987 (39 years ago)

A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.

0.758 inches nominal overall height, 3.560 inches minimum and 3.590 inches maximum overall length, 0.500 inches nominal overall width, 0.205 inches minimum and 0.211 inches maximum distance from center of mounting hole to edge along the width, 2 mounting hole quantity

Product Characteristics

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

Overall Length: 3.560 inches minimum and 3.590 inches maximum
Overall Height: 0.758 inches nominal
Overall Width: 0.500 inches nominal
Mounting Hole Quantity: 2
Distance From Center Of Mounting Hole To Edge Along The Width: 0.205 inches minimum and 0.211 inches maximum
Mounting Facility: unthreaded hole
Block Height: 0.250 inches minimum and 0.255 inches maximum
Clamping Hole Quantity: 5
Clamping Hole Diameter: 0.391 inches minimum and 0.395 inches maximum fourth hole
Clamping Hole Diameter: 0.391 inches minimum and 0.395 inches maximum second hole
Clamping Hole Diameter: 0.391 inches minimum and 0.395 inches maximum third hole
Center To Center Distance Between First And Second Clamping Holes: 0.870 inches minimum and 0.874 inches maximum
Center To Center Distance Between First And Third Clamping Holes: 0.600 inches minimum and 0.602 inches maximum
Center To Center Distance Between First And Fourth Clamping Holes: 2.133 inches nominal
Center To Center Distance Between First And Fifth Clamping Holes: 3.060 inches minimum and 3.064 inches maximum
Special Features: has 2 slotted clamping holes on each end,lg 0.313 in.,width 0.205 in. to 0.211 in.
Material: plastic
Material Document And Classification: mil-p-15035 mil spec single material response
Style Designator: rectangular

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
68A690879-2015/2017/2019	Block Clamp
68A690879-2017	Block Clamp
68A690879-2019	Block Clamp

FAQs

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

What is the FSCG of the NSN 5340-01-257-5231?

The FSCG of the NSN 5340-01-257-5231 is 5340

Does NSN 5340-01-257-5231 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 5340-01-257-5231 contain precious materials?

Item does not contain precious metal.

Does NSN 5340-01-257-5231 contain hazardous materials?

Indicates there is no information in the hmirs. The nsn is in a fsc in table ii of fed std 313 and a msds may be required by the user. The requirement for a msds is dependent on a hazard determination of the supplier or the intended end use of item.

When the NSN 5340-01-257-5231 was assigned to the Federal Catalog?

It was assigned 39 years ago, on Sat, Jun 20, 1987