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If you are looking for a specific part, type in the corresponding part number. Or try our Site Map. If you are unsure of the exact part number, type the first 3 letters or numbers and put an * after it to broaden your search results.


C-Spec 4000 Series Fasteners

The 4000 Series is the Modern Standard in Quick Release Fastening Systems. Compatible With Industry Standard Parts.


When using the 4000 series you will need 4 parts to make up the system. A stud, grommet, retainer, and receptacle. There are many options for each of these items as you will see. Selecting the proper components for your application is simple using the data tables provided on each component's page.

*The most important decision to make is to use a Fixed Depth receptacle or Adjustable Depth receptacle as this greatly affects the stud selection process.

When designing a new application it is best to select components from the inside out.

1.  Determine which Receptacle you want to use.
2.  Select the Grommet you wish to use.
3.  Select a Grommet Retainer (snap ring retained grommets only).
4.  Select a Stud Length (dash number) for the Total Material Thickness (TMT) being fastened. That is, all panels  together including gaskets and gaps (if used).

5.  Finally, select a Stud Head Style and Material.

Once you have determined all of the above and selected the components to be used, be sure to select the appropriate associated tooling which can be found here. Tool part number MS-4P3 (stud plier) is required for any installation. Other tools will be determined by the parts you select. If you have questions or are not sure which tools are required, just Contact Us. We will be happy to help.

About Quick Release Fasteners

We appreciate the support from everyone that uses Genuine MilSpec Products, and over the years it has been that support which has led to our growth. We will continue to work hard to provide fast, friendly and dependable service that will earn your trust in the future.

All content Copyright 1993 - 2016© MilSpec Products, Inc., All Rights Reserved. Trademarks® referenced are the property of their respective owners and do not indicate affiliation with Quick Release Fasteners or MilSpec.


Contact us
MilSpec Products / Quick Release Fasteners
31537 Long Acres Dr.
Sorrento, FL 32776
352-735-0065 (fax)

MilSpec makes no claims regarding suitability of items for any application. Installer is responsible for proper installation and any regulatory compliance.