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Some preliminary questions would be:<br />
Size of organization?<br />
Support Staff?<br />
Budget?<br />
<br />
Here are several that meet your initial requirements:<br />
FileHold - <a href="http://unbouncepages.com/fileholdsoftware/" rel="ugc">http://unbouncepages.com/fileholdsoftware/</a><br />
PinPoint - <a href="http://www.lsspdocs.com/pinpoint-electronic-document-management/" rel="ugc">http://www.lsspdocs.com/pinpoint-electronic-document-management/</a><br />
Dokmee - <a href="https://www.dokmee.com/" rel="ugc">https://www.dokmee.com/</a><br />
<br />
For 4TB of engineering and CAD data, I use a standardized directory structure with robust ACL permissions based on user roles &amp;&nbsp;groups; with X-1 Search (Enterprise) for document retrieval.
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Some preliminary questions would be:
Size of organization?
Support Staff?
Budget?

Here are several that meet your initial requirements:
FileHold - http://unbouncepages.com/fileholdsoftware/ [http://unbouncepages.com/fileholdsoftware/]
PinPoint - http://www.lsspdocs.com/pinpoint-electronic-document-management/ [http://www.lsspdocs.com/pinpoint-electronic-document-management/]
Dokmee - https://www.dokmee.com/ [https://www.dokmee.com/]

For 4TB of engineering and CAD data, I use a standardized directory structure with robust ACL permissions based on user roles & groups; with X-1 Search (Enterprise) for document retrieval.

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Our organization size would be around 50.<br />
Am not sure about the budget though at this point of time. Based on the features and support that would be decided at a later point of time.
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Our organization size would be around 50.
Am not sure about the budget though at this point of time. Based on the features and support that would be decided at a later point of time.

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We're a 50 man manufacturing/engineering operation. Data revision control is extremely important; as is concurrent design data synchronization. <br />
<br />
Any luck with a solution?
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We're a 50 man manufacturing/engineering operation. Data revision control is extremely important; as is concurrent design data synchronization.

Any luck with a solution?

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Please suggest the best document management server for the main requirements given below.<br />
1. API based<br />
2. Self hosted / On-premises <br />
3. All type of documents
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Please suggest the best document management server for the main requirements given below.
1. API based
2. Self hosted / On-premises 
3. All type of documents

Document Server

A Document Management System (DMS) is a system (both hardware and software) used to track, manage and store documents and reduce paper. Most are capable of keeping a record of the various versions created and modified by different users (history tracking). It is often viewed as a component of enterprise content management (ECM) systems and related to digital asset management, document imaging, workflow systems and records management systems.