1/4" Knurled Thumb Nut with Collar – High-Profile Aluminum Alloy & Stainless, Red Black Silver

The "L" value is the total height of the thumb nut body. Generally, select a length that matches or slightly exceeds the exposed stud length you're threading onto. For shallow panel mounting or quick-release fixtures, L10mm (≈3/8") or L15mm (≈19/32") typically works well. For applications requiring more grip height — such as optical rail adjustments or field camera rigs — L25mm (≈1") to L40mm (≈1-9/16") is generally more appropriate. Measure your stud's exposed thread length and ensure the nut height allows full thread engagement before ordering.

The stainless steel threaded insert provides the primary thread strength, which is generally higher than a pure aluminum thread. The aluminum alloy body handles the grip and clamping load distribution. These are typically suitable for light-to-medium clamping loads in camera rigs, instrument panels, and enclosure assembly. For heavy-duty structural or high-vibration applications, contact us to confirm suitability before ordering.

The stainless steel insert offers good corrosion resistance at the thread engagement point. The anodized aluminum body generally resists surface oxidation well for occasional outdoor use. For extended outdoor, marine, or high-humidity environments, we recommend confirming suitability with us before committing to a bulk order, as prolonged exposure may affect the anodized finish over time.

In most cases, yes. These use the 1/4"-20 UNC thread, which is the standard thread for camera tripod systems, quick-release plates, and a wide range of optical bench and rail hardware. They are generally compatible with Manfrotto, Arca-Swiss style systems, Benro, and most other brands that use the 1/4"-20 standard. Always verify the thread standard of your specific hardware before ordering, as some larger format systems use 3/8"-16 threads instead.

The collar (flange at the base) acts as a built-in washer, distributing clamping load over a wider area and protecting soft or thin panel surfaces from indentation. It also provides a positive stop when tightening, which helps prevent over-tightening on delicate assemblies. The collar adds a small amount of height at the base — if you have tight clearance requirements, contact us to confirm the exact collar dimensions for your selected variant.

All three are functionally identical — anodized aluminum alloy body with a stainless steel threaded insert. The color is purely aesthetic and organizational. Red is easy to spot in a gear bag or on a busy workbench. Black blends with most camera and electronics equipment. Silver has a clean, industrial appearance suited to laboratory and optical setups. Many users order multiple colors to color-code fasteners by size or function across a multi-component rig.

For a single fixture or prototype, 1 piece is typically sufficient to test fit and function. For small batch assembly or a complete camera rig with multiple attachment points, a 5- or 10-piece pack generally offers better value per unit. Production facilities, rental houses, and workshop stock typically find the 20-piece pack most cost-effective for maintaining a consistent supply of 1/4"-20 hand-fasteners across multiple setups.