500 ea .440" OD x .040" Wire Dia x 2.312" Long - Extension Springs

Description

Click here to see the rest of our large selection of Aircraft Hardware!
Click Here to see our entire selection of Springs!
Our springs are typically listed in both large (.00+) and small (.95 minimum) quantities.  You can search our store for the box number - which is located at the end of the description -  to view all quantities listed for this particular spring. Be sure to check the box "in titles & description" before searching.
Quantity:
500
O.D.:
.440"
I.D.:
.360"
Wire Diameter:
.040"
Body Length (Coil Length):
1.687"
Length Inside Ends (Inside of one loop to inside of the other):
2.312"
Gap:
.062" approx.
Material:
Music Wire
Coating:
Plain Mill Finish - 5% to 10% have light surface rust from shelf aging, which is why these are listed as "New, Other.....".  Please see random sample close-up photo before buying.  Most are very clean.
Aerospace P/N:
NSN:
Distinguishing
Features:
Both ends have open loops.   Each spring weighs 9.45 grams.
Spring Rate
:
Customers often ask: "how many pounds will this spring pull?"  Well, it depends.  Spring force is dependent on the distance it is displaced (compressed or extended).  The greater the displacement, the higher the force exerted by the spring.  The relationship between force and displacement is directly proportional as expressed by Hooke's Law:
F
=k
x
where:
x = displacement of the spring's end from resting position (inches)
F = Force exerted by spring (lbs)
k
=
Spring Rate Constant
For spring rate constant and other more in-depth calculations, enter the spring dimensions from the above description into one of the many free online spring rate calculators.  For example, searching google for:
calculator edge spring constant calculator
will bring up a simple calculator for coil springs to determine the approximate spring rate constant (
k
).
Using the spring rate constant, you can now use Hooke's Law to answer questions like:
"How many pounds will it take to compress/extend the spring half way?" (F =
k
x)
Or,
"How many inches will the spring compress/extend given a certain number of pounds of pressure?" (x = F/
k
)
I do
NOT
sell cheap junk.  These fasteners are straight from our vast aircraft hardware inventory which were used to support light corporate aircraft service and maintenance.   If you know anything about aviation hardware you will know that these are
high quality
fasteners that cost good money.  These are not worth much since I can't provide manufacturer's quality control certifications as required in some aviation applications.  However, there are many uses for surplus hardware in aviation where certifications are not needed or required. Aircraft hardware is the perfect choice for the race car builder, experimental aircraft builder, or the discriminating hobbyist who demands a much higher level of quality in their fasteners.  In most cases, we are offering aviation fasteners for
less
than the cost of cheap-grade commercial variety you will find in retail hardware stores. As an added bonus, you will not get gouged on shipping!
No certs
No warranty
Buyer to determine airworthiness of all items
All sales final
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I will combine items to save you money on shipping.  You must email me before paying so I can modify your invoice. - Thanks!
How to find what you need from our vast inventory:
You may shop our large aircraft hardware inventory using the category links on the nav bar to your left.  If you are looking for a combination of specs, simply type the specifics in our store search box, for example: something like
"6-32 Screws" "4-40 Stainless nuts
",  "
Brass washers
", or "
Aluminum Phillips Flat"
(without the quotes). Care has been taken to include the pertinent nomenclature in the titles of each fastener to make searching easy and accurate.  For materials, use
"Aluminum", "Brass", "Stainless", "CRES", "Nylon"
. If the title of a screw item doesn't denote a material, it is alloy steel by default. There isn't enough room in the title to go into plating and coatings - although some titles do allow enough room and we use it to denote coatings such as
"zinc"
or
"chrome"
. For the thread size and pitch, you will find the consistent use of "diameter - Threads per inch" syntax.. For example
"2-56", "10-32", or "1/4-28", etc...
. For washer sizes, it is denoted in the title using
"#6"
or
"1/4"
for example.  All screw titles have the term "screws", so if you are searching for all screws of size 8-32, you simply type in
"8-32 Screws"
in the search box (without quotes). For drive type, use
"Phillips", "Pan", "Flat", "Hex", "Round", "Truss", "Binding",
or
"Oval"
.  There isn't enough room in the title to denote 82 degree vs. 100 degree countersink on flat head screws.  Searching for "Drilled Screws" will return all Slotted Fillister Head screws since they are the only one's will holes drilled for safety wire.
Box # RCA75229 S2
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