For 12 years I operated a G Gauge Commercial Train Sales and Service Business. I sold, installed and serviced trains running 8 hours a day in commercial establishments. I have installed hundreds of feet of Aristocraft and USA brand track, most on overhead track systems. I first had a machine shop make me a hex nut driver, with a long handle to fit these cheap small hex nut screws. After you clean out the pink wax that held the screws on to each section of track. Forget about the small blue handle drivers that come in each box of track. After a trying to get the screw real tight, the corners are rounded off these China made drivers. My new tool worked good. I found USA screws to be made better than Aristo's, they had a deeper socket hole, and did not round off so easy. Where I did not have a track screw hole, such as when you cut a section of track, I used a Split-Jaw or Hillman Rail Clamp. Much easier than tapping and drilling.
BUt, here is a better screw,
and hex nut driver,
to get a super tight fit. A screw that when put it on the head of the driver, it will stay there, even as you climb a step ladder, and aim the screw into the little hole on the track joiner. The screw size is an exact replacement for the factory screws, only 100% better. Has a deep socket hole, and will not round off, and stays on the driver. That's the biggest plus for this screw and driver combo.
The screw is sold by: McMaster-Carr Company, in Atlanta, GA.
http://www.mcmaster.com/ < Link To www.mcmaster.com . Their item number for the screw is: 91290A010, Description: Metric Class 12.9 Socket Head Cap Screw, Alloy Steel, M2 Thread, 3MM Length, 0.4MM Pitch. Sold in a box of 50 for $7.66. The Hex Driver is item number: 52975A14, Description: Miniature Plastic-Handle Hex Driver, 1.5mm Hex, 5-45/64" Overall Length. Price $3.61.
These great steel screws can be really screwed in tight, will not strip or round off. After dropping hundrews of the factory screws on the floor, never to be found again, or worse yet dropping them on a lawn when installing a outdoor garden RR, the additional cost is well worth the ease of installation. My driver has lasted 8 years, so your only cost after first purchase is the box(s) of screws. Do not waste your money buying factory screws from the track manufacture. One box of these steel screws and you will be sold. Trust me, Please. Jimbo611