Thomson QSSS 1/2 L 42, Quick Shaft, 0.4990 / 0.4995 in Diameter, Class L, 440C Stainless Steel, 50 Rockwell C Min., 42 in long

Excellent! Just what I was after. Be aware, that if you need to cut this you're in for a challenge. The case hardening is very well done on this shaft, and was much deeper than I was expecting. I ended up having to grind through it, as I didn't have anything hard enough to cut even through the center. This will alter the hardness near the grind as it gets quite hot, but for my application this was acceptable. If you don't know for a fact that you can cut hardened metal, just buy shorter shafts.Diameter tolerances were within specified tolerances as measures with a blade micrometer. Fit my bearings exactly. I am very pleased with this shaft and can recommend them.

Highly recommend this stuff for any linear bearing/actuator applications. If you want to cut it or create 'D' sections on the ends, you need to have an angle grinder and a lot of patience. If you want to drill it, you need to have cobalt drill bits and a lot of lubricant and patience. I burned 3 carbide bits to a stump trying to drill through this rod. It's incredibly rigid, and that's a good thing, just be prepared to spend the time to work with it if you need to make any modifications.

The product looks great. It says it comes with instructions on how to cut it, but I did not get any instructions. I assumed it would have a tip on the best way to cut. This came very well packaged to protect the shaft.

I've been buying chinese rods which claim to be hardened but based on how much they flex, i kind of doubt it. This rod is not much more expensive and it's leagues above the chinese rods. This shaft comes packaged really well. Plenty of padding, in a (really) hard cardboard box with wooden ends. Now i just need to get some quality linear bearings, probably from thomson.

This shaft is well machined and the bearings fit perfect. Like some of the others said a hacksaw will not cut it. I tried and had to switch to a cut off tool. If you need a well made shaft I would recommend this one.

Very well made precision ground and polished shaft. Very hard steel. You will need carbide tools to machine. You can not drill a hole in this shaft and you will need an abrasive cut off tool if you need it shorter. Shipping package is over the top

High quality, appears to be straight and true. I have to mention the shipping package - it was exemplary. Shaft inside plastic warp, in a cardboard box, in bubble wrap, inside another very sturdy cardboard bow with 3" wooden ends, and placed in an Amazon cardboard outer box. This is going to be the shaft for my DIY 18" drum sander.

Thomson 12MM Shaft.-Product is within roundness and straightness tolerances-Arrived in a sealed bag coated with lubrication.- Great Price- 500mm rails are good lengthwise for those looking for a 12MM rail upgrade to their 3d printers, (Matches TAZ line of 3D Printers).- This product was used in conjunction with stepper motors to create a linear actuator.

Good product

Excellent quality