M4x35 vs Other eitech Screw Lengths: A Practical Comparison

Quick answer

The M4x35 screw is a long fastener best suited for joining thick stacks or spanning multiple layers in eitech metal kits. For most standard connections, shorter M4 screws (such as M4x8, M4x12, or M4x20) are more appropriate. Choose the shortest screw that fully engages the nut without protruding excessively.

If you're building with eitech metal construction kits, you'll quickly notice that screw length matters. The M4x35 is one of the longest M4 screws in the eitech range, and it's not meant for every joint. Using it in the wrong place can block moving parts or leave sharp ends exposed.

This comparison looks at the M4x35 alongside other common eitech screw lengths, using supplied catalog facts and practical building scenarios. You'll learn when the extra length helps and when a shorter screw is the smarter choice.

Why screw length is a critical choice in eitech builds

eitech models rely on M4 screws and nuts to hold metal strips, plates, and brackets together. The right length ensures a secure connection without interfering with gears, axles, or moving parts. Too short, and the screw won't reach the nut; too long, and it can protrude, snag, or block rotation.

The M4x35 is 35 mm long, which is substantial compared to typical M4 screws used in eitech kits. It's designed for situations where you need to pass through several stacked components or thick assemblies. Understanding the job at hand is the first step to picking the correct length.

• Always test-fit a screw before tightening it in a moving assembly.
• Keep a variety of lengths on hand to avoid forcing a long screw into a short joint.

How the M4x35 compares to shorter M4 screws

Most eitech connections use screws between 8 mm and 20 mm long. These shorter screws are ideal for joining two or three metal parts, such as attaching a bracket to a plate or securing a gear to a shaft. They keep the build compact and reduce the risk of interference.

The M4x35, by contrast, extends much further. It's useful when you need to clamp a thick sandwich of parts, like combining a bracket, a plate, and a structural beam. However, in a simple two-part joint, the extra length will stick out and may catch on other components or your fingers.

• Use shorter screws (M4x8 to M4x20) for standard two- or three-part connections.
• Reserve the M4x35 for multi-layer stacks or when a shorter screw won't reach the nut.

When the M4x35 is the right choice

The M4x35 shines in assemblies where you need to pass through a thick combination of parts. For example, if you're building a crane arm that layers several metal strips and a bracket, the M4x35 can secure the whole stack with a single screw. It's also handy when you need a temporary long reach during prototyping.

Another scenario: attaching a component to a thick wooden base or a custom mount. The extra length gives you the reach to engage a nut on the other side. Just be sure the protruding end doesn't interfere with moving parts like gears or wheels.

• Check that the screw tip doesn't contact any rotating part after tightening.
• If the screw protrudes more than a few millimeters, consider adding a spacer or using a shorter screw.

The trade-offs of using longer screws

Longer screws like the M4x35 offer versatility but come with drawbacks. They add weight, can obstruct movement, and may require extra nuts or washers to take up slack. In tight spaces, a long screw can be difficult to insert and tighten.

Shorter screws are lighter, less obtrusive, and easier to work with in compact models. However, they may not provide enough reach for thick assemblies. The key is to match the screw length to the specific joint, not to default to one size for everything.

• Keep a mix of lengths in your parts bin to adapt to different build stages.
• When in doubt, start with a shorter screw and switch to a longer one only if needed.

How to choose the right eitech screw length

Start by measuring the total thickness of the parts you need to join. Add a few millimeters for the nut and any washers. That total gives you the minimum screw length. If the calculated length falls between standard sizes, choose the next longer size to ensure full engagement.

For moving assemblies, always verify that the screw end doesn't protrude into the path of other components. If it does, either shorten the stack, use a shorter screw, or add a cap nut. Remember that eitech's modular system rewards planning ahead.

• A quick ruler check before building saves time and frustration.
• Consult your kit's instructions for recommended screw lengths in critical areas.

Trade-offs: M4x35 vs shorter eitech screws

• M4x35 length: 35 mm long, ideal for thick stacks or reaching through multiple layers. Choose when you need maximum reach; avoid in tight, moving assemblies.
• Shorter M4 screws (e.g., M4x8–M4x20): Common lengths for standard two- or three-part joints; keep builds compact. Default to these for most connections; they reduce interference risk.
• Protrusion risk: Long screws can stick out and block gears, wheels, or sliding parts. Always check clearance after tightening; trim or switch if needed.

eitech parts that work with M4 screws

• Bracket 3x1-hole (large): The eitech Bracket 3x1-hole (large) is a component from the eitech Manufaktur line, offered under SKU 01202 in the Standard option. It is intended as a bracket part for construction and model-building use. This bracket has three holes, so you can use M4 screws to attach it to other parts. Its size may require longer screws when stacking with other components.
• Gear 26 teeth module 1 hexagon socket: The eitech Gear 26 teeth module 1 hexagon socket is a precision gear component from the eitech Manufaktur line. It is identified by SKU 01804 and is offered in a Standard variant. It has 26 teeth, module 1, and a hexagon socket connection feature. When mounting this gear, screw length is critical: a screw that's too long can protrude into the gear's rotation path and cause binding. Use the shortest screw that securely holds the gear.

Which screw length should you use?

Best for

• Builders joining thick stacks of metal parts or adding custom mounts.
• Prototyping where you need extra reach to align components before final tightening.

Not for

• Standard two-part connections where a shorter screw would suffice.
• Moving assemblies where a protruding screw could block rotation.

The M4x35 is a valuable addition to your eitech screw collection, but it's not a one-size-fits-all solution. Match the screw length to the joint, keep a variety on hand, and always check for interference. With a little planning, you'll build stronger, smoother models.