1/4-20 Captive Mounting Screw | 0.750" Under-Head Length with 5/32" Hex Head

The Hejnar Photo 1/4-20 Captive Mounting Screw is a professional-grade, high-tensile structural fastener custom-engineered for camera support equipment, quick-release plates, heavy telephoto lens feet, and technical macro rails. Featuring an extra-long 0.750-inch (3/4") total length measured from directly under the screw head and a low-profile 5/32" hex socket head, this captive fastener is designed specifically to work with deep-set counterbored channels, heavy-duty replacement feet, or ultra-thick base plates. It provides an unyielding physical connection that completely eliminates hardware play and ensures maximum camera security on professional tripods and gimbal rigs.

Quick Overview & Key Features

• Precision 1/4-20 Threading: Standard photo-industry connection thread size compatible with most digital camera bodies, medium-to-large telephoto lenses, and tripod plates.
• 0.750" Under-Head Clearance: Extended 3/4-inch total shaft length (including the unthreaded neck and threaded portion) measured entirely from beneath the screw head to accommodate deep or thick-walled gear plates.
• Captive Shank Architecture: Designed explicitly for use with unthreaded clearance recesses or counterbored channels, keeping the hardware safely retained so it cannot fall out of your plate.
• 5/32" Hex Socket Drive: Heavy-duty internal drive socket accommodates standard 5/32" Allen keys, allowing you to apply high tightening torque without slipping or stripping.
• Low-Profile Cylindrical Head: Precision-milled to sit flush or recessed inside standard quick-release plate slots, preventing mechanical interference with tripod clamps.
• Premium Stainless Steel: Forged from high-grade, corrosion-resistant stainless steel to handle harsh outdoor elements and heavy structural load distributions.
• Made in the USA: Precision-manufactured to strict industrial tolerances to ensure lifelong field and studio reliability.

Technical Specifications

• Thread Size: 1/4"-20 (Standard Photo Thread)
• Length Under Head: 0.750 inches (3/4") total shaft reach
• Drive System: 5/32" Hex Socket Head
• Material Construction: High-Strength Stainless Steel
• Mounting Interface Type: Captive style (for unthreaded slider channels, slots, and thick-walled feet)

Product Description

The premium Hejnar Photo 1/4-20 Captive Mounting Screw (0.750" Under-Head Length) is a critical hardware replacement and component asset for sports, wildlife, portrait, and action photographers who require total stability from their support platforms. Because tracking heavy camera rigs puts continuous vibrational and rotational stress on your equipment connections, cheap zinc-plated screws can flex or loosen over time. This heavy-duty stainless steel fastener resolves that physical vulnerability entirely, delivering a rigid lockup that dampens micro-vibrations and completely eliminates rotation.

The definitive mechanical advantage of this specific model is its specialized captive neck architecture combined with an extended 0.750" shaft reach. This dimension dictates the total usable height **underneath the screw head**, meaning the combined width of the unthreaded captive section and the functional threads totals exactly 3/4 of an inch. When deployed inside a matching quick-release plate or macro rail equipped with an unthreaded clearance slot, this clearance allows the bolt to slide and spin freely within the channel without backing out or falling on the ground when the gear is detached. It is highly optimized for extra-deep connection points or specialized custom spacers, ensuring a maximum safety margin of thread engagement under maximum load.

Engineered for high-performance pacing in punishing outdoor field environments, the screw head houses a deep, precision-milled 5/32" hex socket well. Unlike standard slotted screws that easily strip when tightened with a coin or flat screwdriver, this internal hex drive allows you to deploy a standard L-key to deliver massive manual leverage. This ensures an exceptionally firm lockup that won't give way during rapid transitions between landscape and portrait panning configurations. Non-corrosive, rust-proof, and milled in the USA to elite structural standards, this captive screw ensures your technical support train remains tightly grouped together and fully functional on every shoot.