Picatinny rail

A Picatinny rail is a standardized mounting platform used to attach optics, sensors, and precision equipment. It is characterized by its fixed dimensions: each transverse groove is exactly 5.23 mm wide, and the center-to-center distance between the grooves is always 10.01 mm. This standardization ensures that equipment fits perfectly across manufacturers.

The primary difference lies in the dimensions. A Weaver rail has narrower grooves (typically 4.57 mm) and does not have a standardized spacing between the grooves. This means that equipment designed for Picatinny will rarely fit on a Weaver rail, as the recoil lug/locking bolt is too thick. A Picatinny rail is the most future-proof choice for professional equipment.

While aluminum is light, CNC-machined steel offers unmatched mechanical rigidity and significantly lower thermal expansion. This is crucial for measuring equipment, industrial camera equipment, or tasks where even microscopic temperature differences must not affect the system's zero point. Steel also tolerates significantly higher tightening torque without the threads deforming.

QPQ (Quench Polish Quench) is an advanced thermochemical hardening process. It is not just a coating, but a change in the surface structure of the steel itself. The treatment makes the rail extremely resistant to wear, scratches, and corrosion, while also providing a deep, matte black, and non-reflective finish.

To ensure stress-free mounting of steel rails on a steel base, we typically recommend a torque of 2.8 - 3.4 Nm (equivalent to approx. 25-30 inch-pounds). Always use a calibrated torque wrench and tighten the screws from the inside out to equalize mechanical stresses. Always check the manual for your specific equipment.

For high-end precision assembly, we do not recommend the use of liquid threadlocker. Chemical locking fluids can act as an unpredictable lubricant during assembly, preventing precise torque. Instead, ensure that threads and contact surfaces are 100% clean and degreased. The mechanical tension and steel-on-steel friction are more than sufficient to keep the assembly vibration-free.

MOA (Minute of Angle) indicates that the rail is not entirely flat, but milled with a slight forward tilt. A 20 MOA rail points your equipment down by a fraction of a degree. This is used to compensate for elevation adjustment over very long distances, so that your equipment's internal adjustment mechanism (e.g., in an advanced sensor or laser rangefinder) can remain centered within its optimal operating range.

Yes, to a great extent. The Picatinny and NATO standard has become incredibly popular in the film and photography industry (especially for heavy-duty rig setups and studio mounting). You can find adapters for Arca-Swiss and other camera standards, which provides an extremely strong and vibration-free platform for heavy lenses or expensive sensor equipment.

A correctly mounted steel rail can bear several hundred kilograms in pure shear strength. The limitation is almost never in the rail itself, but rather in the substrate (the threaded holes it is mounted in) or the quality of the clamp/bracket you fasten to the rail.

The QPQ surface is extremely hard and requires minimal maintenance. The most important thing to maintain precision is to keep the transverse grooves completely free of dust, metal chips, and dirt, so your equipment can make perfect contact. Use a stiff nylon brush to clean the grooves, and wipe the rail with a clean cloth.

The QPQ treatment makes the steel highly rust-resistant and extremely resistant to moisture, sweat, and chemicals. However, no steel is 100% rust-proof under extreme conditions. A light wipe with an acid-free machine oil or silicone cloth now and then ensures that the rail remains completely protected throughout its lifespan.

STANAG 4694 is a newer NATO standard, which builds upon the Picatinny design. The dimensions (groove width and spacing) are identical to Picatinny (MIL-STD-1913), so they are fully backward compatible. The difference lies in the technical measurement specification for how the clamp grips the rail: STANAG mounts are designed to grip the top and bottom of the rail tightly, instead of wedging themselves onto the sides. This provides even higher repeatability (repeat accuracy). Our rails are CNC-milled to tolerances that meet the requirements of both systems.

If the surface (e.g., a machine housing) you are mounting on has irregularities, the rail can be forced to warp when tightened. To avoid this tension, an industrial "bedding" (a filling with a special epoxy) can be done between the machine and the rail. This creates a perfect impression and a 100% mechanical contact surface, after which the rail can be tightened completely stress-free.