We believe this is a replacement switch activated by closing the door of a microwave. It’s a N/O (normally open) microswitch from Dongnan Electronics, rated for 5A at 125V and 2A at 250V. Comes with a bent 1-3/4” lever and is prewired with 19” leads and a 2-pin 5.5mm Molex connector. UL.

If Madame Curie had owned this, she'd be alive today. (She'd be more than 140 years old, of course, but still….) Our Radex RD1503 digital radiation meter evaluates the ambient level of gamma radiation, and can detect objects polluted by beta active radioactive nuclides. It uses a Geiger counter to detect the amount of gamma radiation within 40 seconds. It indicates the ambient dose equivalent in µSv/hr (0.05 to 9.99) and the µRem/hr exposure dose rate on a scale of 0.1 to1.25. The values are displayed on a 1-3/4" x 1-1/8" LCD screen. The presence of each particle is indicated by a clicking sound, for quick identification of affected areas, and it has an audio alarm with 3 adjustable ranges. The unit measures 4" x 2-1/4" x 1" and comes with a detailed manual and technical certificate. Requires (2) "AAA" batteries. Made in Russia. CE.

Okay, they’re just strips of metal, but CJ says one of each and a grapefruit will get you at least a “C” at the science fair. The copper electrode is 100mm long x 18mm wide  x .8mm thick (3.94" x .7" x .041”). The zinc electrode is 4” long x 3/4” wide x .027” thick and stamped “ZN”. And both of them are awfully useful for crafters and jewelry makers, too.

Build your own quartz antenna. These (2) 4-3/8" x 3" x 1-5/16" plastic boxes each have (2) boxes of quartz crystals inside and (2) aluminum U-brackets that are attached to a single screw terminal on one short side of the box. Back in the early 70's, they were originally made to be used in pairs as part of a 300 Ohm antenna. Not sure if they will work with today's TV's but all you need is cabling to connect them and give it a try. Made in Brazil, the antenna capital of South America, probably.

This black plastic gear is 3-1/16" dia with (96) teeth at 32 pitch, 20-degree pressure angle. Center has a 9/16" ID bore with a 3/4" dia x 1/8" bushing on both sides. One side also has (3) 3/32" ID x 1/8" standoffs along with a 3/16" tooth along one edge. Source and function are unknown but you'll think of something.

Get plugged in with this pair of jacks, one each: 1/8” (3.5mm) feminine jack to 1/4” plug; and 1/4” feminine jack to 1/8” (3.5m) plug. Both are TRS--tip/ring/sleeve--wired. You get (4) jacks in all, you lucky thing, you.

From Therm-O-Disc, this thermal cut-off switch is N/C (normally closed) by definition. (Thermal cut-offs are what keep your coffeepot from burning your house down.) This one shuts down between 221°F (105°C) and 248°F (120°C) and measures 5/8" dia x 9/16" thick, with (2) axial terminals.

We searched the world over to find a good source for the most popular transistors. Success! Check out our listing and pick your favorite. Click the item to view the pin outs.

Our motorman, CJ, called this reversible 12-24VDC motor strange, mostly because it has the power contacts mounted on the face, bracketing the 11/16" x 1/8" mostly striated shaft, and has no mounting brackets. But that shouldn't stop a clever person like you. (Hint: it was probably made to fit into a sleeve of some sort.) At 12VDC, draws 100mA no load, stalls 850mA and spins approx 900 rpm; at 24VDC, draws 150mA, stalls 2.2A and spins approx 1800 rpm.  Measures 2-1/4" x 1-13/32" dia.

Don't wait or it'll all be gone. You get (4) pieces, 11 feet each, of 18-2 wire, polarized, black with a white stripe and eminently discardable spade-push terminals on both ends. (That's under a nickel a foot, cowboy.) Lamp cord, speaker wire, pretty much anything you run juice to.

Little takeout 3-6VDC Mabuchi motors (6VDC nominal) spin approx 4000 rpm and draw 50mA no load. Stall at 300mA and measure 1-1/2" long x 1-1/16" dia with a 1/2” long x 3/32” dia shaft with a 2-sheave 9/16” dia pulley. Sheaves are 1/16” ID. Wired with 2” leads for super easy battery or wall adapter hook up. These were originally from copiers so you'll want to wipe 'em down before use.

These pillow block bearings have 13-gauge steel mounting straps, 4" long x 1-1/8" with 5/16" x 5/8" mounting slots, and a sintered iron ball unit measuring 1-11/16" dia with either a 5/8” ID or 1” ID brass sleeve. The 5/8” ID one has an oil cup on the top; the 1” dia version has a grease fitting in the same place.

These 15uH chokes are encased in clear heat-shrink tubing with pre-soldered jumper leads. Rated for up to 4A and measure approx 4-1/2" long. Made in Germany.

This pair of 3” pliers-style alligator clips for quick wire connections have red and black insulator boots, and are good for up to a whopping 30A. Crimp connections are under the rubber insulators. We'll send you (2) pairs because you can't charge a battery without (4) clips. 

Little takeout 3-6VDC Mabuchi motors (6VDC nominal) spin approx 4000 rpm and draw 50mA no load. Stall at 300mA and measure 1-1/2" long x 1-1/16" dia with a 1/2” long x 3/32” dia shaft with a 2-sheave 9/16” dia pulley. Sheaves are 1/16” ID. Wired with 2” leads (positive and negative) for super easy battery or wall adapter hook up. A little dusty but incredible for scout projects, classroom robotics projects or making your own army of walking zombies.

More gators than a University of Florida homecoming. Scroll on down and select from: our 6-piece assortment of 2” electrical clips including (2) each of insulated pliers-type alligator clips, regular insulated alligator clips and booted alligator clips in red and black; our 4-pack of insulated 2-1/4” pliers-type alligator clips rated for up to 10A with 3/8” wide jaws and crimped ends in black and red; our 29” red and black test leads with open alligator clips at the ends; or our 6-pack of plated 1-1/2” alligator test clips, half red and half black, with crimped ends.

With this 1.2K OHM 10% tolerance power resistor. Rated 3 to 5 watts, it has a ceramic block body 3/8" sq x 1-1/2" long with wire leads on ends, one of which is 1/2" long and the other 1-1/2". Any questions?

This small reversible DC motor from JEI runs on 3-6VDC. At 6V it draws 350mA no load and stalls at 1.9A. Spins approx 1000 rpm and approx half that at 3V. Great for science fairs, hobbies and any kind of project that needs spinning. Measures 1-3/16" long x 7/8" dia with a 1/4" x 1/16" shaft and tiny contacts for power that you'd best solder.