Крепление находится на заднике.

Крепление is a neuter noun because it ends in -ие, which is a very common neuter ending in Russian.

In this sentence, крепление usually means something like fastening, mount, attachment, or fixture, depending on context. It often refers to a part used to attach one thing to another.

So grammatically:

• крепление = nominative singular
• gender = neuter

That is why the verb is находится, not находитсяа or anything else: Russian present-tense verbs do not change for gender, only for person and number.

In Russian, есть is usually not used the way English uses is/are in simple location sentences.

So English The fastening is on the back panel is often expressed in Russian as:

• Крепление находится на заднике.

Literally, находится means is located or is situated.

This sounds natural when talking about where something is physically located. In many contexts, you could also simply omit the verb in present tense Russian:

• Крепление на заднике.

But находится makes the location statement more explicit and often sounds more formal, technical, or descriptive.

На заднике is in the prepositional case.

Why? Because after на, when you are talking about location—where something is—the noun normally takes the prepositional case.

Here:

• на = on
• задник → на заднике

So:

• задник = nominative singular
• на заднике = prepositional singular

This is the standard pattern for location:

• на столе = on the table
• на стене = on the wall
• на заднике = on the back part / back panel / heel counter, depending on context

Because на задник would normally suggest direction or motion toward something, not location.

Russian often works like this:

• на + accusative = motion onto / onto something
• на + prepositional = location on something

Compare:

• Положить на стол = to put onto the table
• Лежать на столе = to lie on the table

In your sentence, the fastening is already located there, so Russian uses the prepositional:

• на заднике

Задник is a context-dependent word. Its basic idea is something like the back part, back side, or rear section of an object.

Depending on context, it can mean things like:

• the back panel
• the rear part
• the heel counter or back part of a shoe
• the backdrop in some other contexts

So in this sentence, you usually should not memorize a single English translation in isolation. It is better to understand it as the back/rear part of the item, with the exact English wording depending on what object is being discussed.

Yes, possibly. It depends on context.

Because задник can refer to a specific back piece or rear section, possible translations include:

• The fastening is on the back.
• The fastening is on the back panel.
• The fastening is on the rear part.

If this is about a shoe, a bag, a piece of equipment, or furniture, the most natural English translation may change. Russian often leaves this kind of detail to context.

Yes, Russian word order is fairly flexible, although different orders can sound more or less natural depending on emphasis.

The neutral version is:

• Крепление находится на заднике.

You might also see:

• На заднике находится крепление.

This version emphasizes the location a bit more, almost like:

• On the back part, there is a fastening.

So the grammar stays correct, but the focus changes.

Yes, in some contexts.

Russian often omits the verb to be in the present tense, especially in simple statements. So you may hear or read:

• Крепление на заднике.

This can sound like a label, a short technical note, or a concise description.

However:

• Крепление находится на заднике.

sounds fuller and more standard as a complete sentence, especially in technical or explanatory language.

The form заднике here is prepositional singular.

For a masculine noun like задник, the prepositional singular often ends in -е:

• задник → о заднике / на заднике

So the sentence means on the back part of one item, not several.

If it were plural, the form would be different.

A useful pronunciation guide is:

• креплЕние нахОдится на зАднике

Stress:

• креплЕние
• нахОдится
• зАднике

A rough English-style approximation would be:

• kryep-LYE-ni-ye na-KHO-di-tsa na ZAD-ni-kye

But it is best to listen to native audio if possible, especially for:

• the soft consonants
• unstressed vowels
• the -тся ending in находится

Yes, находится is a reflexive form, from находиться.

In this sentence, you do not need to think of it as literally reflexive in the English sense. The whole verb находиться commonly means:

• to be located
• to be situated
• to be found

So it is best learned as a complete vocabulary item:

• находиться где? = to be located where?

Example:

• Офис находится в центре. = The office is located in the center.

Usually на is correct if the idea is on the back part / on the rear section.

A different preposition would change the meaning:

• в заднике = inside the back part or in the heel counter/back section, depending on context
• за задником = behind the back part

So на заднике specifically means the fastening is on that surface or part, not inside it or behind it.

It sounds somewhat neutral to technical.

The combination of:

• крепление
• находится
• на заднике

feels natural in product descriptions, instructions, manufacturing, clothing or footwear descriptions, and technical explanations.

In casual everyday speech, a person might use a simpler phrasing depending on the object:

• Крепление сзади. = The fastening is at the back.
• Крепление на задней части. = The fastening is on the back part.

But your original sentence is perfectly normal and clear.