Square-Opening Clamps & Flat-Mouth Holders — Universal Mounting Adapters for Shoulder Frames, Waist Frames, Stirrup Leg Frames & Kneeling Boards
Product Title
Square Opening Clamp and Flat Mouth Holder for Operating Table | 304 Stainless Steel Surgical Mounting Adapter | Universal Side-Rail Compatibility for Shoulder Frame, Waist Frame, Stirrup Leg Frame & Kneeling Board Attachment
Product Overview
This comprehensive range of square-opening clamps and flat-mouth holders serves as the critical interface between operating table side rails and the surgical positioning accessories mounted upon them — including shoulder frames, waist frames, stirrup-shaped multifunctional leg frames, and monolithic kneeling boards. Fabricated entirely from 304 stainless steel for corrosion resistance, structural rigidity, and full autoclave compatibility, each clamp and holder is precision-engineered to match the specific side-rail dimensions of different operating table brands, ensuring a secure, rattle-free connection that holds firm under the dynamic loads of surgical positioning.
The product family spans multiple plate sizes and opening dimensions — from 25 × 10 mm to 32 × 9 mm clamp plates and square openings ranging from 20 × 7 mm to 26 × 9 mm — covering the full spectrum of side-rail profiles found across major operating table manufacturers worldwide. Whether the surgical team needs to attach a shoulder frame for steep Trendelenburg positioning, a waist frame for lateral spine surgery, a stirrup-shaped leg frame for lithotomy, or a kneeling board for posterior knee and ankle procedures, the correct clamp variant in this range provides the exact mounting geometry required for a safe, stable, and repeatable connection.
These clamps and holders are the unsung heroes of the operating room — small, rugged components that enable the entire modular positioning accessory ecosystem to function reliably across any table brand, any procedure, and any surgical discipline.
Key Features & Clinical Advantages
304 stainless steel construction — Every clamp and holder is fabricated from medical-grade 304 stainless steel that resists corrosion from repeated disinfection, maintains structural integrity under sustained load, and withstands standard autoclave sterilization cycles without deformation or surface degradation.
Multiple plate and opening sizes — The range covers clamp plate dimensions from 25 × 10 mm to 32 × 9 mm and square openings from 20 × 7 mm to 26 × 9 mm, ensuring a precise match to the side-rail profile of any major operating table brand — eliminating the need for improvised adapters or shims.
Square-opening design — The precision-machined square opening provides a positive, anti-rotational engagement with the accessory's mounting rod, preventing unwanted rotation or slippage under load — a critical safety feature when the clamp is supporting a shoulder frame, leg frame, or kneeling board that must remain absolutely stable during the procedure.
Flat-mouth clamp profile — The low-profile flat-mouth design minimizes the clamp's protrusion beyond the side rail, reducing the risk of interference with the surgeon's working space, sterile drapes, and adjacent positioning accessories.
Universal accessory compatibility — Each clamp variant is designed to accept the standard mounting rods of shoulder frames, waist frames, stirrup-shaped multifunctional leg frames, and monolithic kneeling boards, making it the universal link between the operating table and the positioning accessory.
Rapid installation and removal — The clamp's simple, tool-free design allows surgical staff to install or swap accessories in seconds — tightening the clamp screw to secure the accessory, or loosening it to release and reposition — streamlining case turnover and reducing setup time.
Model Variants & Specifications
General-Purpose Square Holders & Clamps
FP-042-E1 — Square Holder / Clamp / Flat Mouth Holder
A general-purpose square holder with a 25 × 10 mm clamp plate, designed for standard side-rail operating tables with 25 × 10 mm rail profiles. This model serves as the baseline clamp for attaching shoulder frames, waist frames, and other positioning accessories to the most common rail size found across major OT table brands. The flat-mouth profile keeps the clamp low and unobtrusive, while the precision-machined square opening provides positive anti-rotational engagement with the accessory's mounting rod.
FP-043-A1 / FP-043-A2 / FP-043-A3 — Square Holder / Clamp / Flat Mouth Holder
A family of three square holders available with clamp plates sized 28.5 × 9.5 mm (FP-043-A1), 25 × 10 mm (FP-043-A2), and 28 × 9.5 mm (FP-043-A3), each featuring a 25 × 7 mm square opening. The three plate-size variants cover the most common side-rail dimensions across different operating table manufacturers, while the standardized 25 × 7 mm square opening ensures compatibility with the full range of positioning accessories that use 25 mm mounting rods. This series is the most versatile in the general-purpose clamp range, providing a precise fit for tables with 28.5 mm, 28 mm, or 25 mm rail widths.
Stirrup Leg Frame Square Holders
FP-043-B2 / FP-043-B4 — Square Holder for Stirrup-Shaped Leg Frame
Specialized square holders with clamp plates sized 25 × 10 mm (FP-043-B2) and 30 × 10 mm (FP-043-B4), purpose-designed for mounting stirrup-shaped multifunctional leg frames to the operating table side rail. These holders are engineered to handle the higher dynamic loads generated by leg frames during lithotomy positioning — where the patient's legs are elevated, abducted, and subjected to surgical manipulation. The larger clamp plate area distributes the load more evenly across the rail, reducing the risk of clamp slippage under the sustained lateral and torsional forces that leg frames impose. The two plate-size variants ensure compatibility with both 25 mm and 30 mm rail profiles.
Flat Mouth Holders — 20 × 7 mm Opening
FP-044-A3 / FP-044-A5 — Square Holder / Flat Mouth Holder
Square holders with clamp plates sized 30 × 8 mm (FP-044-A3) and 32 × 9 mm (FP-044-A5), each featuring a 20 × 7 mm square opening. The 20 × 7 mm opening is designed for accessories that use 20 mm mounting rods — a common size for lighter-duty positioning accessories such as arm boards, hand rests, and small retractors. The larger clamp plate dimensions (30 × 8 mm and 32 × 9 mm) provide enhanced grip on wider side rails, ensuring secure attachment even on tables with non-standard or oversized rail profiles.
Flat Mouth Holders — 26 × 9 mm Opening
FP-044-B2 / FP-044-B4 — Square Holder / Flat Mouth Holder
Square holders with clamp plates sized 25 × 10 mm (FP-044-B2) and 30 × 10 mm (FP-044-B4), each featuring a 26 × 9 mm square opening. The 26 × 9 mm opening accommodates accessories with 26 mm mounting rods — a size commonly used for medium-duty positioning accessories including waist frames, kneeling board mounts, and certain shoulder frame components. The two clamp plate options ensure compatibility with both 25 mm and 30 mm side-rail widths.
Square Clamps — 25 × 9 mm Opening
FP-044-C2 / FP-044-C4 — Square Clamp / Flat Mouth Clamp
Square clamps with clamp plates sized 25 × 10 mm (FP-044-C2) and 30 × 10 mm (FP-044-C4), each featuring a 25 × 9 mm square opening. This 25 × 9 mm opening size provides a slightly taller engagement profile than the 25 × 7 mm opening found in the FP-043-A series, offering increased rotational resistance for accessories that experience higher torsional loads — such as shoulder frames used in steep Trendelenburg positioning or waist frames used in lateral spine surgery where the patient's trunk weight creates significant rotational force on the mounting rod.
Anesthesia Curtain Clamps
FP-045-A3 / FP-045-A4 — Square Clamp / Anesthesia Curtain Clamp
Square clamps with clamp plates sized 30 × 6 mm (FP-045-A3) and 30 × 10 mm (FP-045-A4), each featuring a 13 mm round hole instead of the square opening found in the other models. The round hole is specifically designed for mounting anesthesia curtain rods — the vertical poles that support the sterile drape separating the anesthesia workstation from the surgical field. The 13 mm diameter accommodates standard anesthesia curtain rod sizes, while the two clamp plate options ensure compatibility with both narrow (30 × 6 mm) and standard (30 × 10 mm) side-rail profiles. These clamps are essential for maintaining the sterile barrier between the anesthesia team and the surgical team throughout the procedure.
Clinical Applications
These square-opening clamps and flat-mouth holders enable the attachment of positioning accessories across virtually every surgical discipline:
Shoulder frame mounting — Clamps secure shoulder frame rods to the side rail, providing the anti-rotational stability needed to prevent the patient from sliding cephalad during steep Trendelenburg positioning in pelvic, colorectal, and gynecologic laparoscopic surgery.
Waist frame mounting — Clamps attach waist frame rods for lateral spine surgery, kidney surgery, and flank approaches where the patient's trunk must be stabilized against rotational forces during table flexion and lateral tilt.
Stirrup-shaped leg frame mounting — Heavy-duty holders secure stirrup leg frame rods for lithotomy positioning in urology, gynecology, obstetrics, and colorectal surgery, withstanding the dynamic loads of leg elevation, abduction, and surgical manipulation.
Monolithic kneeling board mounting — Clamps attach kneeling board support rods for posterior knee, ankle, and Achilles tendon procedures where the patient is positioned prone with the knee flexed over a kneeling board.
Anesthesia curtain support — Round-hole clamps mount anesthesia curtain rods to maintain the sterile drape barrier between the anesthesia workstation and the surgical field.
Arm board and hand rest mounting — Flat-mouth holders with 20 × 7 mm openings secure arm board and hand rest rods for upper-limb positioning in general surgery, orthopedics, and microsurgery.
Multi-accessory configurations — Multiple clamps can be installed on a single side rail at different positions, allowing the surgical team to mount several positioning accessories simultaneously — for example, a shoulder frame at the head end, a waist frame at the mid-table, and a leg frame at the foot end — each secured by its own precisely matched clamp.
Cross-facility standardization — The range of plate sizes covers the side-rail dimensions of all major operating table brands, enabling hospitals with mixed table inventories to standardize on a single clamp inventory that serves every table in every operating room.
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Meta Description (for product listing pages)
← Back to all products304 stainless steel square-opening clamps and flat-mouth holders for operating table side rails. Multiple plate sizes (25×10 to 32×9 mm) and opening dimensions (20×7 to 26×9 mm) for universal compatibility with all major OT table brands. Enables secure attachment of shoulder frames, waist frames, stirrup leg frames, kneeling boards, and anesthesia curtain rods. Essential mounting adapters for surgical positioning accessories.