# M4 screw won't go in **URL:** \ **Category:** 3D Printer Parts\ **Created:** [August 13, 2022, 10:53pm UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498 "2022-08-13T22:53:56Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Zeezee073](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/z/839c29/32.png) [@Zeezee073](https://3dprintingspace.com/u/Zeezee073)\ **Post date:** [August 13, 2022, 10:53pm UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498/1 "2022-08-13T22:53:56Z")
I’ve just finally added the lead screw in and when started to tighten the screws that connect the z motor and bar together the right side and fell of. When tried to screw it back in it aligned perfectly but will not go in at all. Could you help me ![20220813_224741](https://storage.3dprintingspace.com/original/2X/d/ddf940f43242c57b27b16af8da6158932898d49f.jpeg) ![20220813_224730](https://storage.3dprintingspace.com/original/2X/6/6ab93b45d3a39382eb03c225413ea0e5c654d945.jpeg) ---
**Author:** ![Jason](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/jason/32/6148_2.png) [@Jason](https://3dprintingspace.com/u/Jason)\ **Post date:** [August 15, 2022, 8:01pm UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498/2 "2022-08-15T20:01:22Z")
Looks like you may have stripped out the threads in the aluminum. The easiest way to fix it is to use a drop-in T-nut and a shorter bolt Parts I have are listed below, You would only need a pack of each [https://3dprintingcanada.com/products/m4-t-nuts-for-20-series-10-pack?variant=39403768512581](https://3dprintingcanada.com/products/m4-t-nuts-for-20-series-10-pack?variant=39403768512581) > **[Stainless Steel Metric Thread Flat Head Cap Screw (10 Pack)](https://3dprintingcanada.com/products/stainless-steel-metric-thread-flat-head-cap-screw-10-packs?variant=39532758007877)** > > Pre-packaged in 10 packs. 304 Stainless Steel Flat Head Cap Screw available in M2.5, M3, M4, M5, M6, and M8 sizes Measurements are given from the end of the screw to the top of the head.  Hope this helps ---
**Author:** ![PJprincefpv](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/pjprincefpv/32/262_2.png) [@PJprincefpv](https://3dprintingspace.com/u/PJprincefpv)\ **Post date:** [August 15, 2022, 8:36pm UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498/3 "2022-08-15T20:36:07Z")
So my recommendation is to just unscrew that Z upright bar and flip it the other way looks like Jason is right you stripped the screw ---
**Author:** ![mykepredko](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mykepredko/32/4027_2.png) [@mykepredko](https://3dprintingspace.com/u/mykepredko)\ **Post date:** [August 16, 2022, 12:39am UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498/4 "2022-08-16T00:39:58Z")
Rather than the twist Tee nuts, wouldn’t the spring loaded ones > **[M4 T Nuts with a ball bearing for 20 Series (10- Pack)](https://3dprintingcanada.com/collections/parts-aluminum-extrusion-t-nuts/products/m4-t-nuts-with-a-ball-bearing-for-20-series-10-pack)** > > Online and Retail Store based in Hamilton, Ontario, Canada specializing in 3D Filaments, 3D Resins, 3D Printers, 3D Printer Parts, 3D Printing and 3D Printer Training with thousands of products in stock. be better? I don’t like the twist ones because it’s too easy to apply too much torque and end up bending the V-Slot rail. ---
**Author:** ![Jason](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/jason/32/6148_2.png) [@Jason](https://3dprintingspace.com/u/Jason)\ **Post date:** [August 16, 2022, 12:20pm UTC](https://3dprintingspace.com/t/m4-screw-wont-go-in/4498/5 "2022-08-16T12:20:20Z")
HI Myke The only reason I suggest them for this application is for ease of getting the Z motor in or out for maintenance, The drop-ins will come out with the motor and the other ones stay in the extrusion and I find most of the time will lose traction on the extrusion and drop to the bottom. Just my personal pref that’s all, Other ones will work.