High performance contact resistance test system

Dongguan Yinyin Hardware Products Co., Ltd. is a one-stop service enterprise integrating production, service, sales and after-sales. Welcome buyers to negotiate!
Thanks to the manufacturer of professional silver contacts (in-mold riveting parts), stamping parts, low-voltage switches (wall switches, leakage switches, etc.) that focus on "safety electricity, safety switches, safety electricians"! Thank you for your attention! ! Committed to providing users with the most comprehensive safety power detail service!

The contact resistance is the impedance to the current through the closed contact pair. This type of measurement is performed on devices such as connectors, relays, and switches. This resistance is usually very small, ranging from microohms to a few milliohms, so a 4-wire measurement is required. Programmable scanners dramatically reduce measurement time by switching a set of test instruments to multiple contacts. For example when testing multiple pin connectors or automatically testing multiple contacts in an environmental chamber.

Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in: silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, various precision stampings, conductive copper posts, contacts Screws, electrical screws, DC, AC various pins, rivets, silver dots, binding posts, stamping parts and production of various silver, copper, iron, aluminum, non-show steel and other heterosexual products, electricity, mobile phone 13728192869, Mr. Chen

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We Manufacture, Exporter & Supplier-Alloy steel WP11 Reducer,ASTM A234 WP91 Reducer, ASTM A420 WPL6 Reducer
We can manufacture two kinds of  Pipe ReducerConcentric Reducer and Eccentric Reducer.Which are commonly used to change the pipe size or pressure in a piping system. 
ASTM A234 WP11 reducers, ASTM A234 WP91 reducer, ASTM A420 WPL6 reducer are made of Alloy Steel seamless tube within the range of DN 15 – DN 1000.

Pipe Reducer Fittings Specifications

Pipe Reducer

Nominal Diameter Outside Diameter End to End
D1*D2
DN NPS Series A Series B H
20×15 3/4×1/2 26.9×21.3 25×18 38
20×10 3/4×3/8 26.9×17.3 25×14 38
25×20 1×3/4 33.7×26.9 32×25 51
25×15 1×1/2 33.7×21.3 32×18 51
32×25 1.1/4×1 42.4×33.7 38×32 51
32×20 1.1/4×3/4 42.4×26.9 38×25 51
32×15 1.1/4×1/2 42.4×21.3 38×18 51
40×32 1.1/2×1.1/4 48.3×42.4 45×38 64
40×25 1.1/2×1 48.3×33.7 45×32 64
40×20 1.1/2×3/4 48.3×26.9 45×25 64
40×15 1.1/2×1/2 48.3×21.3 45×18 64
50×40 2×1.1/2 60.3×48.3 57×45 76
50×32 2×1.1/4 60.3×42.4 57×38 76
50×25 2×1 60.3×33.7 57×32 76
50×20 2×3/4 60.3×26.9 57×25 76
65×50 2.1/2×2 73.0×60.3 76×57 89
65×40 2.1/2×1.1/2 73.0×48.3 76×45 89
65×32 2.1/2×1.1/4 73.0×42.4 76×38 89
65×25 2.1/2×1 73.0×33.7 76×32 89
80×65 3×2.1/2 88.9×73.0 89×76 89
80×50 3×2 88.9×60.3 89×57 89
80×40 3×1.1/2 88.9×48.3 89×45 89
80×32 3×1.1/4 88.9×42.4 89×38 89
90×80 3.1/2×3 101.6×88.9 – 102
90×65 3.1/2×2.1/2 101.6×73.0 – 102
90×50 3.1/2×2 101.6×60.3 – 102
90×40 3.1/2×1.1/2 101.6×48.3 – 102
90×32 3.1/2×1.1/4 101.6×42.4 – 102
100×90 4×3.1/2 114.3×101.6 – 102
100×80 4×3 114.3×88.9 108×89 102
100×65 4×2.1/2 114.3×73.0 108×76 102
100×50 4×2 114.3×60.3 108×57 102
100×40 4×1.1/2 114.3×48.3 108×45 102
125×100 5×4 141.3×114.3 133×108 127
125×90 5×3.1/2 141.3×101.6 – 127
125×80 5×3 141.3×88.9 133×89 127
125×65 5×2.1/2 141.3×73.0 133×76 127
125×50 5×2 141.3×60.3 133×57 127
150×125 6×5 168.3×141.3 159×133 140
150×100 6×5 168.3×114.3 159×108 140
150×90 6×3.1/2 168.3×101.6 – 140
150×80 6×3 168.3×88.9 159×89 140
150×65 6×2.1/2 168.3×73.0 159×76 140
200×150 8×6 219.1×168.3 219×159 152
200×125 8×5 219.1×141.3 219×133 152
200×100 8×4 219.1×114.3 219×108 152
200×90 8×3.1/2 219.1×101.6 – 152
250×200 10×8 273.0×219.1 273×219 178
250×150 10×6 273.0×168.3 273×159 178
250×125 10×5 273.0×141.3 273×133 178
250×100 10×4 273.0×114.3 273×108 178
300×250 12×10 323.9×273.1 325×273 203
300×200 12×8 323.9×219.1 325×219 203
300×150 12×6 323.9×168.3 325×159 203
300×125 12×5 323.9×141.3 325×133 203
350×300 14×12 355.6×323.9 377×325 330
350×250 14×10 355.6×273.0 377×273 330
350×200 14×8 355.6×219.1 377×219 330
350×150 14×6 355.6×168.3 377×159 330
400×350 16×14 406.4×355.6 426×377 356
400×300 16×12 406.4×323.9 426×325 356
400×250 16×10 406.4×273.0 426×273 356
400×200 16×8 406.4×219.1 426×219 356
450×400 18×16 457×406.4 478×426 381
450×350 18×14 457×355.6 478×377 381
450×300 18×12 457×323.9 478×325 381
450×250 18×10 457×273.0 478×273 381
500×450 20×18 508×457 529×478 508
500×400 20×16 508×406.4 529×426 508
500×350 20×14 508×355.6 529×377 508
500×300 20×12 508×323.9 529×325 508
550×500 22×20 559×508 – 508
550×450 22×18 559×457 – 508
550×400 22×16 559×406.4 – 508
550×350 22×14 559×355.6 – 508
600×550 24×22 610×559 – 508
600×500 24×20 610×508 630×529 508
600×450 24×18 610×457 630×478 508
600×400 24×22 610×406.4 630×426 508
650×600 26×24 660×610 – 610
650×550 26×22 660×559 – 610
650×500 26×20 660×508 – 610
650×450 26×18 660×457 – 610
700×650 28×26 711×660 – 610
700×600 28×24 711×610 720×630 610
700×550 28×22 711×559 – 610
700×500 28×20 711×508 720×530 610
750×700 30×28 762×711 – 610
750×650 30×26 762×660 – 610
750×600 30×24 762×610 – 610
750×550 30×22 762×559 – 610
800×750 32×30 813×762 – 610
800×700 32×28 813×711 820×720 610
800×650 32×26 813×660 – 610
800×600 32×24 813×610 820×630 610
850×800 34×32 864×813 – 610
850×750 34×30 864×762 – 610
850×700 34×28 864×711 – 610
850×650 34×26 864×660 – 610
900×850 36×34 914×864 – 610
900×800 36×32 914×813 920×820 610
900×750 36×30 914×762 – 610
900×700 36×28 914×711 920×720 610
950×900 38×36 965×914 – 610
950×850 38×34 965×864 – 610
950×800 38×32 965×813 – 610
950×750 38×30 965×762 – 610
1000×950 40×38 1016×965 – 610
1000×900 40×36 1016×914 1020×920 610
1000×850 40×34 1016×864 – 610
1000×800 40×32 1016×813 1020×820 610
1050×1000 42×40 1067×1016 – 610
1050×950 42×38 1067×965 – 610
1050×900 42×36 1067×914 – 610
1050×850 42×34 1067×864 – 610
1100×1050 44×42 1118×1067 – 610
1100×1000 44×40 1118×1016 1120×1020 610
1100×950 44×38 1118×965 – 610
1100×900 44×36 1118×914 1220×920 610
1150×1100 46×44 1168×1118 – 711
1150×1050 46×42 1168×1067 – 711
1150×1000 46×40 1168×1016 – 711
1150×950 46×38 1168×965 – 711
1200×1150 48×46 1220×1168 – 711
1200×1100 48×44 1220×1118 1220×1120 711
1200×1050 48×42 1220×1067 – 711
1200×1000 48×40 1220×1016 1220×1020 711
Alloy-Steel-WP11-reducer-Buttweld Fittings


ASTM A420 WPL6 Fitting-Reducer

ASTM-A234-WP11 Fittings manufacturer

ASTM-A234-WP91-Concentric-Reducer

Alloy Reducer

Alloy Reducer,Concentric Reducer,Eccentric Reducer,Pipe Reducer

HEBEI HANMAC MACHINE CO., LTD. , http://www.chinahanmac.com