FAA Approved for Aircraft
Use Under TSO-C-148A
Fully Compatible and Interchangeable with Existing OEM Parts!
* Please note: Due to environmental
regulations, steel parts are no longer cad plated. The plating used is
bright zinc with yellow chromate. This gives the same appearance as cad
with similar corrosion protection but is more environmentally friendly.
Cad is available as an option, however minimum quantities may apply.
Contact us for details if cad plating is required.
This Series is the Modern Standard in Quick
Release Fastening Systems. They have an 800# working
strength and 1050# Ultimate Tensile load capacity.
All dimensions on this page are in inches unless otherwise
specified. For metric conversion use this formula: Inches x 25.4 =
mm. mm ÷ 25.4 = Inches.
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 below.
Selecting the proper components for your application is simple using
the data tables below. If you have any questions or need additional
information, please
Contact Us and we will be glad to help.
When designing a new application it is best to select components
from the inside out.
First, determine which Receptacle you want to
use. See Table # 1.
Next, select the Grommet you wish to use.
See Table # 2.
Then, select a Grommet Retainer (snap ring retained only)
See Table # 3.
Next, select a Stud Length (dash number). If you have chosen to use
Adjustable Depth receptacles, use
Table # 4. If you have chosen
Fixed Depth receptacles use
Table # 5.
Finally, select a stud Head Style and Material from
Table # 6.
Reference Table # 7 to measure an
existing stud for replacement purposes.
Once you have determined all of the above and selected the
components to be used, be sure to reference
Table # 8 to select the appropriate associated
tooling.
Tool part number 4P3 (stud plier) is
required for any installation. Other tools will be determined
by the parts you select. Some tools are not absolutely necessary but
are very helpful in assuring proper hole spacing, hole diameters,
and a proper installation.
Receptacles are available in several styles. There are many options but,
the most important distinction to make is do you want to use fixed depth
or adjustable depth receptacles as this
will greatly affect the stud selection process. The original
standard system used fixed depth
receptacles and various stud lengths to fit different panel
thicknesses. This configuration is limited to small variations in
material thickness (0.030") from one stud length to the next.
Later, MilSpec
developed an adjustable depth
receptacle which allows a much wider material thickness range
(0.300") for a
given stud length than the
original design. This not only simplifies the installation but
dramatically reduces inventory costs for the fabricator. For your
convenience, we stock both fixed depth and adjustable depth styles.
If the materials to
be fastened are of a consistent thickness at each fastener location
either type will work very well. If the thickness is variable at
different fastener locations we recommend the adjustable depth
receptacles for ease of use. After selecting the basic type of receptacle
to be used, refer to the table below to select from the various
styles, options, materials, etc.
The receptacles are usually attached to the support
(inside) panel with rivets. The Rigid Style is a
fixed depth, solid, machined piece. This style does not allow for
misalignment of fastener to receptacle holes. They are available
with plain rivet holes (most common) or countersunk rivet holes. The
countersunk rivet holes allow relief for receptacles to be attached
to thin sheet metal panels that have dimpled holes for flush attachment
rivets. Various materials are available for any receptacle type or
style.
A Floating Style receptacle style is also available in either
fixed depth or
adjustable depth. The floating style allows the body of
the receptacle to move 1/16" in any direction to assist with
minor misalignment of holes from fastener to receptacle. The
floating feature is only to assist in the fastener to receptacle
engagement. Once the fastener is locked, the panels are pulled
tightly together and the receptacle will not be able to move (float)
until the fastener is disengaged (unlocked). They are available with
plain rivet holes (most common) or countersunk rivet holes. The
countersunk rivet holes allow relief for receptacles to be attached
to thin sheet metal panels that have dimpled holes for flush
attachment rivets. Various materials are available for any receptacle type or
style.
* Note: We recommend MS245 type, floating receptacles for most applications
for their ease of use and simplicity of installation.We also recommend our new tool number
MS-ARDT when using the adjustable depth receptacles. It makes
setting the proper depth a snap! See tools section for info.
Click on desired Part Number below to add the item to your shopping
cart
(quantity can be adjusted after adding item to cart).
* NOTE:
When using 244-16BR receptacles add
.030" to your TMT calculations.
Outer Panel, Snap Ring Retained Grommet Selection
Table # 2
There are two basic types of grommets for the 4000 series C-Spec
fasteners and they go though the outer panel only. Therefore you will
need to measure the thickness of the outer panel and select the shortest
grommet that will fit it.
The snap ring retained type grommets are the most common, least
expensive, are reusable and have many size and style options. They will
protrude slightly from the back side of the outer panel. This protrusion
of the grommet is absorbed by the inner panel, support structure,
receptacle or a combination of these. Therefore, no gap will exist
between panels.
Flare type grommets are also available. These are permanently crimped
into the panel using a special tool (part number MS-40GFT) and have
nearly zero protrusion from the back side of the panel. However, they
have limited size and style options. We recommend the flare type only
for applications subjected to severe continuous vibration. Please call
for details and availability of flare type grommets.
Both types of grommets are available in two basic styles. The low
profile (plus flush) grommets are the most common and easiest to
install. The profile of the head is approx. 0.025". Countersunk Flush
grommets can be used in applications requiring the fasteners to be
completely flush with the panel surface. During panel preparation,
countersinking or dimpling the outer panel is required for flush
grommets.
* Note 1:Snap ring retained
grommets will protrude slightly from the back side of the outer panel.
Therefore, use the shortest grommet possible to fit the outer panel.
Minimum "Total Material Thickness" (TMT, all panels together) must be
observed to prevent grommets from jamming against the receptacle when
the fastener is locked.
* Note 2: When installing snap
ring type grommets, use tool number MS-T26 which can be found in the
tools section or at the bottom of this page.
For metric conversion use this formula: Inches x 25.4 = mm. mm ÷
25.4 = Inches.
Click on desired Part Number below to add the item to your shopping
cart
(quantity can be adjusted after adding item to cart).
Grommet retainers
are simple snap rings that keep the grommet and fastener in
the panel when unlocked. Various styles are available below,
primarily in stainless steel. We recommend the R4GS retainer for
most applications. A high shear retainer part number R4T is also
available. It is slightly thicker and retains the grommet more
tightly to the outer panel. The MS-T26 tool is used to install both
of these. For worn or oversized panel holes, we also have a large area
retainer part number 4002-LWS-2 which requires tool number
MS-T40 for installation. The large area retainer can also be used
for high shear applications.
Click on desired Part Number below to add the item to your shopping
cart
(quantity can be adjusted after adding item to cart).
4000 Series Stud Dash Numbers (Lengths)
Using MS245 Adjustable
DepthReceptacles and Various Grommets
Table # 4
If
the Total Material Thickness (TMT) is very near the top of the
thickness range, selection of the next greater dash number is
recommended. Longer lengths are available. Add .030" to TMT range
for each stud dash number increase.
For metric conversion use this formula: Inches x 25.4 = mm. mm ÷
25.4 = Inches.
4000 Series Stud Dash Number
Using
Countersunk Flush Grommets
4000 Series Stud Dash Number
Using Low
Profile Grommets
Minimum Grip(TMT)
Maximum
Grip(TMT)
Minimum
Grip(TMT)
Maximum
Grip(TMT)
-1
0.010"
0.310"
-2
0.010"
0.310"
-2
0.040"
0.340"
-3
0.040"
0.340"
-3
0.070"
0.370"
-4
0.070"
0.370"
-4
0.100"
0.400"
-5
0.100"
0.400"
-5
0.130"
0.430"
-6
0.130"
0.430"
-6
0.160"
0.460"
-7
0.160"
0.460"
-7
0.190"
0.490"
-8
0.190"
0.490"
8
0.220"
0.520"
-9
0.220"
0.520"
-9
0.250"
0.550"
-10
0.250"
0.550"
-10
0.280"
0.580"
-11
0.280"
0.580"
-11
0.310"
0.610"
-12
0.310"
0.610"
-12
0.340"
0.640"
-13
0.340"
0.640"
-13
0.370"
0.670"
-14
0.370"
0.670"
-14
0.400"
0.700"
-15
0.400"
0.700"
-15
0.430"
0.730"
-16
0.430"
0.730"
-16
0.460"
0.760"
-17
0.460"
0.760"
-17
0.490"
0.790"
-18
0.490"
0.790"
-18
0.520"
0.820"
-19
0.520"
0.820"
-19
0.550"
0.850"
-20
0.550"
0.850"
-20
0.580"
0.880"
-21
0.580"
0.880"
4000 Series Stud Dash Numbers (Lengths) Using Fixed Depth
Receptacles
and Various Grommets
Table # 5
If
the Total Material Thickness (TMT) is very near the top of the
thickness range, selection of the next greater dash number is
recommended. Longer lengths are available. Add .030" to TMT range
for each stud dash number increase.
For metric conversion use this formula: Inches x 25.4 = mm. mm ÷
25.4 = Inches.
Total Material
Thickness (TMT)
All Panels Together
Using
Rigid
Receptacles (214-16 etc.)
Using
Floating Receptacles (244-16 etc.)
With
Countersunk Flush
Grommets
With Low Profile
Grommets
With
Countersunk Flush
Grommets
With Low Profile
Grommets
.021" - .050"
---
-1
-1
-2
.051" - .080"
-1
-2
-2
-3
.081" - .110"
-2
-3
-3
-4
.111" - .140"
-3
-4
-4
-5
.141" - .170"
-4
-5
-5
-6
.171" - .200"
-5
-6
-6
-7
.201" - .230"
-6
-7
-7
-8
.231" - .260"
-7
-8
-8
-9
.261" - .290"
-8
-9
-9
-10
.291" - .320"
-9
-10
-10
-11
.321" - .350"
-10
-11
-11
-12
.351" - .380"
-11
-12
-12
-13
.381" - .410"
-12
-13
-13
-14
.411" - .440"
-13
-14
-14
-15
.441" - .470"
-14
-15
-15
-16
.471" - .500"
-15
-16
-16
-17
.501" - .530"
-16
-17
-17
-18
.531" - .560"
-17
-18
-18
-19
.561" - .590"
-18
-19
-19
-20
.591" - .620"
-19
-20
-20
-21
4000 Series Stud Head Styles and Materials
Table # 6
Select a stud head style. Various head styles are available.
4002 series slotted head
C-Specs feature our special Collared Slot which prevents your screwdriver from slipping and scratching expensive paint. Phillips (cross recess) head and wing head
versions are also available. All studs come in different lengths (dash
numbers) that are used for accommodating different
Total Material Thicknesses (TMT, all
panels together).
Studs vary in length by .030". The stud length (dash number) is indicated by a Number stamped
in the head of the stud. Please use the charts below to determine what stud length
is suitable for the material thickness range being used and for the
grommet and receptacle styles you have chosen. Please note
that studs -16 and longer will require a secondary stud retainer
part number 4002-SW to keep the stud in the grommet when unlocked.
Click on the desired part number to add the item to your shopping cart
(quantity can be adjusted after adding item to cart)
* Note: -1 studs are special order. Please
call for stock availability.
Longer Lengths and Different Head Styles are Available. Please call for pricing and stock
availability.
Stud Replacement
Table # 7
Use this chart to measure
an existing stud for replacement purposes. The stud's dash number
should be stamped in the head of the stud. If it is unreadable,
simply measure the total length of the stud. For wing head studs, do
not
include the wing in measurement.
Stud Dash Number
Total Stud Length (Tolerance: ± .010")
Stud Dash Number
Total Stud Length (Tolerance: ± .010")
-1
0.650"
-11
0.950"
-2
0.680"
-12
0.980"
-3
0.710"
-13
1.010"
-4
0.740"
-14
1.040"
-5
0.770"
-15
1.070"
-6
0.800"
-16
1.090"
-7
0.830"
-17
1.120"
-8
0.860"
-18
1.150"
-9
0.890"
-19
1.180"
-10
0.920"
-20
1.210"
Longer
lengths are available.
Add .030" (.762mm) to Total Stud Length for every dash number increase.For metric conversion
use this formula: Inches x 25.4 = mm. mm ÷ 25.4 = Inches.
This tool just made MilSpec
Adjustable Depth receptacles easier to install than ever! Do you
know how thick your material is? Can you turn a screwdriver? Well,
that is all the skill required to fit virtually any panel! Simply
lock this tool into the receptacle, turn to the appropriate setting,
remove the tool and lock the receptacle. No need to " fit " the
outer panel in place to find the right depth. Just use this tool and
go right to final assembly! Part Number
MS-ARDT (Patent Pending S/N 12/495,983)
