Strain Relief 16 mm: When and How to Install
By Products for bench top machinists | LittleMachineShop.com | Published: 2026-10-24
Category: How-to Guides
Learn when to replace the 16 mm strain relief on your bench mill and follow step-by-step instructions to install it correctly and protect the power cord.
Quick answer
Install the 16 mm strain relief on your bench mill when the power cord shows signs of wear or pulls at the entry point. It is a simple replacement that protects the cord and prevents future damage.
Why the strain relief matters
The strain relief is a small but important part on your bench mill. It secures the power cord where it enters the machine, reducing strain and wear. Over time, cords can bend, pull, or fray at that point, which can lead to electrical issues or even safety hazards. Replacing a worn strain relief is a quick, low-cost fix that keeps your machine running safely.
When to replace it
Check the strain relief whenever you notice the power cord is loose, cracked, or showing bare wires near the machine housing. Also replace it if the old part has become brittle or no longer grips the cord firmly. If you are already working on the mill's wiring or control box, it is a good time to inspect and replace this part as preventive maintenance.
How to install the 16 mm strain relief
- Disconnect power: Unplug the bench mill from the electrical outlet before doing any work. This is a safety must—never work on electrical components while the machine is connected. Double-check that the machine is unplugged and the switch is off.
- Remove the old strain relief: Locate the strain relief where the power cord enters the mill. Depending on the model, you may need to remove a cover or access panel. Carefully pull out the old strain relief and disconnect the cord if necessary. Keep track of any screws or fasteners you remove so you can reassemble later.
- Insert the new strain relief: Feed the power cord through the new 16 mm strain relief, ensuring the cord sits securely in the channel. Push the strain relief into the mounting hole until it snaps or fits firmly into place. Make sure the cord is not twisted or pinched inside the strain relief.
- Reconnect and test: Reconnect the power cord to the machine's wiring if you disconnected it, then reattach any covers or panels. Plug the mill back in and test that the power cord is secure and the machine operates normally. Give the cord a gentle tug to confirm the strain relief holds it firmly.
Product facts
- Strain Relief, 16 mm: This strain relief is designed to protect the power cord on your bench mill and is identified as part #195 on the 3900 Bench Mill. It fits the 3900 Bench Mill perfectly, so you can replace the old part without modifications.
Strain Relief, 16 mm
