The ULAMEX silver and anodized middle clamp is the most frequently used fastening component in professional solar panel mounting systems. Positioned between two adjacent photovoltaic modules, a single solar panel mid clamp grips both panel frames simultaneously — replacing two end clamps and reducing your hardware count by up to fifty percent across every interior junction of the array. For solar installers, EPC contractors and PV distributors who demand reliable, consistent quality at wholesale volumes, ULAMEX middle clamps deliver the mechanical performance and corrosion resistance required for installations rated to last twenty-five years and beyond. Every clamp ships M8 T-bolt hardware, and is available in both silver (natural anodized) and black anodized finishes to match any module aesthetic.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Aluminum EN AW-6060 T6, anodized |
| Available sizes | 30 mm, 32 mm, 35 mm, 37 mm, 40 mm, 45 mm, 50 mm |
| Finish options | Silver anodized (natural) / Black anodized |
| Fastener | M8 T-bolt + sliding nut (stainless steel A2) |
| Recommended torque | 12–14 Nm (M8 bolt) |
| Clamp type | Middle clamp (inter-module) |
| Rail compatibility | Standard T-slot PV profiles (40×40 mm, 45×40 mm) |
| Corrosion protection | Anodized aluminum |
| Operating temperature | −40 °C to +85 °C |
| Standards | Eurocode wind/snow load compatible, CE |
How It Works — Installation Guide
Installing a solar panel middle clamp is straightforward. Slide the M8 T-bolt into the T-slot channel of your PV mounting rail, position the clamp body between two adjacent module frames, and tighten the bolt to the recommended torque of 12–14 Nm using a calibrated torque wrench. The clamp compresses against the panel frame, creating a vibration-damping grip that distributes clamping pressure evenly across the frame surface. Never exceed the specified torque — over-tightening can crack the panel frame glass, compromising both electrical output and mechanical integrity. For arrays installed in high-wind zones, consider increasing from four to six clamps per module to enhance uplift resistance and comply with Eurocode EN 1991 wind load requirements.
Compatible Components
ULAMEX middle clamps are engineered to integrate seamlessly with the complete ULAMEX photovoltaic mounting system. Pair them with our aluminum PV profiles (40×40 mm and 45×40 mm cross-sections) for the rail structure, end clamps at the array edges, roof hooks for pitched roof attachment, and T-bolts, sliding nuts and other PV fasteners for complete assembly. For flat roof applications, combine with ballast mounting trays and PV triangles for a fully non-penetrating tilted installation.
Application Scenarios
Pitched roof installations: Middle clamps secure modules to rails mounted on roof hooks attached to rafters beneath tile, slate or metal roofing. The silver anodized finish blends with most panel frames, while the black anodized variant complements all-black module designs increasingly popular in residential markets across Europe.
Flat roof systems: When combined with ballast trays and tilt triangles, middle clamps fasten modules to rail profiles that rest on non-penetrating ballast frames — preserving the integrity of , TPO, PVC and bituminous roof membranes on commercial and industrial buildings.
Ground-mounted arrays: For solar farms and open-field installations, the same middle clamp secures modules to profiles mounted on driven piles or concrete foundations. The high corrosion resistance of anodized aluminum ensures long-term durability in exposed outdoor environments.
Carport and canopy structures: Middle clamps adapt to carport-specific mounting structures, enabling dual-purpose installations that generate electricity while providing covered parking for commercial properties.
Sizing Guide — Selecting the Correct Clamp Height
The gripping height of a solar panel clamp must match the frame thickness of the PV module. Check the module manufacturer’s datasheet for the frame height specification — typically 30, 32, 35, 37, 40, 45 or 50 mm for current-generation panels. Select the corresponding clamp size. If your project uses modules from multiple manufacturers with different frame heights, order clamps in each required size. As a rule of thumb, for a row of N modules you need (N−1) middle clamps and 2 end clamps per rail line (top and bottom), totaling 4 clamps per module as a baseline. In high-wind zones or for large-format panels above 400 W, increase to 6 clamps per module for enhanced structural security.
Standards and Certifications
ULAMEX middle clamps are manufactured from EN AW-6060 T6 aluminum in accordance with European material standards. The anodizing process meets the requirements of Qualanod quality specifications for architectural anodizing. All clamps are designed for installations calculated under Eurocode EN 1991 (wind and snow loads). ULAMEX operates under EN 1090 certification for execution of steel and aluminum structures, ensuring full traceability from raw material to finished component. Material test certificates (EN 10204 Type 3.1) are available on request for project documentation.
Why Choose ULAMEX
ULAMEX is a European B2B wholesaler with over thirty-five years of experience in steel and aluminum distribution. We supply solar panel clamps at volume-based pricing with pallet delivery across the EU. Our complete PV mounting component range — profiles, clamps, fasteners, roof hooks, ballast trays and triangles — is available from a single source, simplifying your procurement and reducing shipping costs. Contact our team for project-specific quotations, stock availability and technical consultation.
Frequently Asked Questions
What is the difference between a middle clamp and an end clamp?
A middle clamp sits between two adjacent solar panels and grips both module frames at the same time. An end clamp is positioned at the outer edge of the array and secures only one panel frame. Middle clamps are more efficient because each one replaces two end clamps — reducing component count and installation time across every interior junction of the module row.
How do I determine the correct clamp size for my solar panels?
Check the frame height in your solar panel’s technical datasheet. The clamp gripping height must match the frame thickness. For example, a module with a 35 mm frame requires 35 mm clamps. ULAMEX supplies middle clamps in all standard sizes from 30 to 50 mm, covering virtually every framed PV module currently manufactured worldwide.
What torque should I apply to the clamp bolt?
The recommended tightening torque for the M8 stainless steel T-bolt on aluminum clamps is 12–14 Nm. Always use a calibrated torque wrench. Over-tightening may crack the module frame, deform the clamp or strip the sliding nut thread — any of which can compromise the structural integrity and void the module manufacturer’s warranty.
Are ULAMEX middle clamps compatible with other manufacturers’ mounting rails?
Yes. ULAMEX middle clamps use the industry-standard M8 T-bolt and sliding nut system, which is compatible with most T-slot PV mounting rails on the market, including profiles from K2 Systems, Schletter, Novotegra and similar manufacturers. For guaranteed performance and full system warranty, we recommend pairing them with ULAMEX PV aluminum profiles.