Hejnar FR-D4-2.375 clamp, Arca-Swiss D4 head clamp, 2.375 inch round quick release, tripod screw knob clamp, CNC aluminum Arca clamp, Hejnar Photo USA, Arca-Swiss quick release, RRS compatible, Markins, Wimberley, Kirk, Acratech, Photo Clam, Foba, Jobu Designs, Vanguard ABH, 1/4-20 M6 threaded clamp

The Hejnar Photo FR-D4-2.375 Quick Release Clamp is a 2.375" diameter round Arca-Swiss style screw-knob clamp designed specifically for the Arca Swiss D4 Tripod Head. Precision-machined from 6061-T6 aluminum, this clamp features a captive-style knob and a center socket that accepts either a flat head 1/4"-20 screw (included) or M6 screw.

The clamp includes 2.6mm deep relief grooves to support safety-stop-equipped plates and prevent free fall when not fully closed. The tongue-in-pocket design ensures jaw alignment and protects internal components from dust and grit. All edges are rounded for safe handling and gear protection.

✅ Compatible With

• Arca Swiss D4 Tripod Head
• Markins
• Really Right Stuff (RRS)
• Wimberley
• Kirk
• Photo Clam
• Foba
• Vanguard ABH Series
• Custom Brackets
• Jobu Designs
• Acratech
• Other Arca-style systems

📐 Specifications

• Diameter: 2.375"
• Center Socket: Accepts flat head 1/4"-20 (included) or M6 screw
• Relief Grooves: 2.6mm deep for plate safety stops
• Knob: Captive, one-piece aluminum, dust-resistant
• Design: Tongue-in-pocket for jaw alignment and grit protection
• Material: CNC-machined 6061-T6 aluminum
• Finish: Black anodized surface
• Hardware: Stainless steel
• Made in USA

📦 Auction Includes

• One Hejnar FR-D4-2.375 Quick Release Clamp (2.375" diameter)
• One flat head 1/4"-20 screw
• Hex wrench for provided screw

🚚 Shipping Information

• Free USPS First Class Mail
• Tracking info provided upon shipment
• Note: USPS delivery times may vary and tracking updates are not always daily
• For time-sensitive orders, select FedEx, UPS, or USPS Express Mail at checkout