Lincoln Viking 3350 Headgear Replacement Guide: Comfort You Can Restore

← All Posts helmets Weld Gear Team Last updated on July 19, 2026

The cartridge on a Lincoln Viking 3350 can be flawless while the helmet still feels miserable, because comfort lives in the headgear, not the lens. Worn ratchets that will not hold, a stretched crown strap, a sweatband gone hard, these are what make a good hood feel done. The fix is rarely a new helmet. This Lincoln Viking 3350 headgear replacement guide covers the right part, what it fits, and how to swap it.

The Part You Need

The standard replacement headgear for the Viking 3350 is Lincoln part KP4100-1, a ratcheting headgear that includes the sweatband. It is the same headgear platform used across the Viking family, so it fits the 1740, 1840, 2450, and 3350 series, which makes it easy to source.[^https://www.amazon.com/dp/B0BQW9KZZ5?tag=mysuggestions01-20]

There are a couple of alternatives worth knowing. Lincoln has also offered the KP3908-1 pivot-style headgear, and the newer X6 headgear (KP4470-1) upgrades comfort with a six-point suspension that spreads helmet weight around your head instead of concentrating it on the crown. If your complaint is a sore spot on top of your head during long jobs, the X6 is the upgrade path rather than a like-for-like replacement.

What It Fits

The KP4100-1 ratcheting headgear covers the mainstream Viking auto-darkening lineup: 1740, 1840, 2450, and 3350. That cross-compatibility is handy because it means the part stays widely available and you are not hunting a model-specific harness. Always confirm the mounting style matches your shell’s pivot points before ordering, since the X6 and pivot headgears attach a little differently.

How to Replace It

Remove the old headgear. Most Viking headgear attaches at three points, one on each side pivot and one at the rear. Pop the side pivots free (they typically twist or unclip from the adjustment knobs) and release the rear mount.
Note your old settings. Before it comes off, glance at the crown strap depth and the circumference setting so you can dial the new one close to your fit.
Fit the side pivots first. Line up the new headgear’s side tabs with the shell’s pivot holes and secure them with the tension knobs. These knobs also set how easily the hood flips up and stays down.
Secure the rear. Clip or screw the rear mount into place.
Set the fit. Adjust the ratchet for circumference, the crown strap for height, and the tilt tension so the lens sits at the right distance and angle when you nod down.

The Honest Weak Point

The knock on the standard Viking headgear is the same one across many auto-darkening hoods: the three-point ratchet concentrates weight and can create a pressure point on top of the head during all-day overhead or production work. It is perfectly comfortable for general use, but heavy users feel it. That is precisely the gap the X6 six-point headgear fills, so if you are replacing headgear because of crown soreness rather than a broken part, spend the extra on the six-point rather than repeating the same pressure point.

Who should skip the standard headgear: all-day production and overhead welders chasing maximum comfort, who are better served by the X6 six-point suspension.

The Bottom Line

Replacing the headgear is the cheapest way to make a tired Lincoln Viking 3350 feel new again, and the KP4100-1 ratcheting headgear with its included sweatband is the straightforward answer that also fits the 1740, 1840, and 2450. If your real problem is crown pressure on long jobs, treat the replacement as a chance to upgrade to the X6 six-point suspension instead. Either way, the lens you already trust gets a fresh, comfortable harness, and the helmet goes back to disappearing on your head the way good gear should.

Frequently Asked Questions

What headgear fits the Lincoln Viking 3350? The standard replacement is Lincoln KP4100-1 ratcheting headgear, which includes a sweatband and also fits the Viking 1740, 1840, and 2450.

Does the Viking 3350 headgear include a sweatband? Yes. The KP4100-1 replacement headgear comes with the sweatband.

Is there a more comfortable headgear for the Viking 3350? Yes. The X6 headgear, KP4470-1, uses a six-point suspension that spreads weight more evenly and reduces crown pressure during long or overhead work.

Will Viking 1740 or 2450 headgear fit my 3350? Yes. The KP4100-1 ratcheting headgear is shared across the 1740, 1840, 2450, and 3350, so the standard harness is cross-compatible.

How is the Viking headgear attached? It mounts at three points, the two side pivots at the tension knobs and a rear mount. Confirm your shell’s pivot style before ordering, since the X6 attaches differently.

Why does my Viking 3350 hurt the top of my head? The standard three-point ratchet can create a crown pressure point during long jobs. The X6 six-point headgear is the upgrade that solves it.

Can I replace just the sweatband instead of the whole headgear? Yes, if the ratchet and straps are still good. Lincoln offers replacement sweatbands, but if the ratchet no longer holds, replace the full headgear.