China Factory for hex head drilling screw Export to Qatar
Name Hex head self driing screw. Place of Origin zhengjiang,china Length non-standard as request&design Standards GB, DIN, ISO, ANSI/ASTM, BS, JIS etc Material SS201/202/304/316/316L,carbon steel,etc. Surface Plain,hot galvanized, bule white, etc Delivery 5-20days Package 25KG/CTN,36CTNS/PLT, or according to customers’ requirement Payment T/T Non-standards OEM is available if you provide a drawing or sample. Samples Samples are free.
China Factory for hex head drilling screw Export to Qatar Detail:
|Name||Hex head self driing screw.|
|Place of Origin||zhengjiang,china|
|Length||non-standard as request&design|
|Standards||GB, DIN, ISO, ANSI/ASTM, BS, JIS etc|
|Surface||Plain,hot galvanized, bule white, etc|
|Package||25KG/CTN,36CTNS/PLT, or according to customers’ requirement|
|Non-standards||OEM is available if you provide a drawing or sample.|
|Samples||Samples are free.|
Product detail pictures:
The really wealthy projects administration experiences and a person to just one assistance model make the higher importance of company communication and our easy understanding of your expectations for China Factory for hex head drilling screw Export to Qatar, The product will supply to all over the world, such as: Bangalore, Cancun, Switzerland, We are adhering to the philosophy of "attracting customers with the best solutions and excellent service". We welcome customers, business associations and friends from all parts of the world to contact us and seek cooperation for mutual benefits.
How do we get heat energy or thermal energy from one place to another? ANSWER: ONE of the mechanisms is CONDUCTION. In this mechanism energy only gets from here to there. That is – there is no transfer of heated stuff. Heat is applied to one end of a conductor – say – and the resulting higher agitation of the elemental parts is felt by collision along the conductor.
A. We do a classic experiment first done by Ben Franklin. A copper
rod and an iron rod are tightly joined at one end. The common
junction is placed in some hot STUFF – boiling oil – say – and
the remote ends are held in the hands. After a time we FEEL some¬
thing. And we feel it sooner – quicker – faster on the copper
rod. Copper has roughly ten times the thermal conductivity of iron.
It is also a better electrical conductor.
B. A metal rod and a wooden rod are smoothly fitted end-to-end.
Over the common junction we wrap a sheet of paper – tight.
We now hoW the system over a flame at the junction. And what
do we see? The paper is scorched where the wood is but not
where the metal is. REASON: the metal being a good conductor
takes the heat energy away before the paper has a chance to heat
up high enough to kindle.
C. We put a flame under a paper cup. The paper cup burns – as we
might expect! Now we fill another cup with water – still paper
- and we can boil the water in the paper cup without any injury
to the paper! Indeed – we can boil the water all away! MORAL: why not do all our cooking in paper pots?
D. A thermometer reads room temperature. We quickly immerse the
bulb in a vessel of HOT water. What do we see FIRST? Answer:
A DROP in the reading. And after a time the mercury column
climbs. Any why is the thermometer bulb cylindrical? To expose
greater surface for quicker response to mercury. Remember the
beautiful properties of spheres. Which is why raindrops are spher¬
ical. The energy of a system tends toward least.
E. A burning cigarette on a glass ashtray is likely to go out when the
hot end gets to the glass. Why? The glass conducts the heat away.
F. A burning cigarette on the edge of a wooden block? IT scorches
the wood. See B again.
G. A dinner table TRICK? Wedge a spoon and a fork together with a
match properly lodged and balance the whole thing on the edge of
a glass. Add to the dilemma by having another match uniquely
placed giving the idea that this second match is NECESSARY for
stability! Now we propose to light all the matches. What will
happen? Take a wager!
H. And how to bake BIG potatoes QUICK? Trivial – Watson -says Holmes: just lodge some big nails in them. The metal is a good conductor!
I. And how about a roast in the oven – a BIG one? With a bone in it the heat conduction is very rapid. And bone is a wonderful thing – very wonderful! A blood factory!
J. Is it not better to put your feet out of bed on to a deep matted rug rather than on to a bare floor? And remember: They are both at the same temperature – remember this. But the matted rug is a poor thermal conductor — which is to say – it is a good thermal insulator.
K. And when you touch the metal faucet it FEELS COLD. It is no colder than the table top!
L. A more formal demonstration can be done with a device having a metal hub – like the hub of a wheel – from which spokes emanate – and the spokes are different metals.
Thus we see in these various demonstrations how heat energy or thermal energy isCONducted from a place of higher temperature to a place of lower temperature – and there is no transfer of heated stuff.
By Anne 2016-3-08 16:27
This company has a lot of ready-made options to choose and also could custom new program according to our demand, which is very nice to meet our needs.
By Julie 2016-10-11 12:41