PV Fasteners and Others
ULAMEX supplies a comprehensive range of fasteners and small mounting components for photovoltaic installations. From T-bolts and sliding nuts that secure modules to mounting rails, through hanger bolts for roof substructures, to grounding plates and cable management clips — every element needed to complete a professional PV installation. Available in A2 stainless steel (1.4301), anodized aluminium and hot-dip galvanized finishes.
Complete PV Hardware — Bolts, Nuts, Clips and Connectors
A reliable PV installation depends not only on profiles and clamps, but equally on the quality and specification of its fasteners. Under-specified bolts, corroding washers or poorly grounded frames compromise safety, void warranties and reduce system lifespan. ULAMEX sources all PV mounting hardware to meet the material and dimensional requirements of professional solar installations across Europe.
Our fastener range covers the full spectrum of PV mounting needs:
- T-bolts and hammer bolts (M8, M10) — for securing mid and end clamps to PV mounting profiles. Available in A2 stainless steel and galvanized carbon steel.
- Sliding nuts and channel nuts (M8) — for rapid, tool-free positioning within the profile channel before tightening.
- Hanger bolts and double-threaded screws (M10, M12) — for connecting roof handles to timber rafters. Wood thread on one end, metric thread on the other.
Self-drilling screws and bi-metal screws
for direct mounting to trapezoidal sheet metal roofs without pre-drilling.
Grounding plates and earthing connectors
for equipment grounding and potential equalisation per IEC 62548 / EN 62305.
EPDM washers and protective tapes
for waterproof sealing at roof penetration points and vibration damping.
Rail connectors, splices and end caps
for extending, joining and finishing PV mounting rails.
Cable clips
stainless steel clips for secure DC cable routing along mounting rails.
ULAMEX is an EN 1090 certified B2B wholesaler supplying the complete range of PV mounting hardware alongside profiles, clamps, ballast systems and PV triangles. One supplier, one delivery, one invoice — simplifying procurement for installers and distributors. All fasteners are available in bulk packaging (100, 250, 500, 1000 pieces) with pallet delivery across Europe.
Frequently Asked Questions
What bolt material should I use for solar panel mounting?
For most PV installations, A2 stainless steel (1.4301 / AISI 304) is the standard choice — it resists atmospheric corrosion and is compatible with aluminium profiles without galvanic corrosion risk. For coastal or highly corrosive environments, A4 stainless steel (1.4401 / AISI 316) is recommended. Hot-dip galvanized fasteners are a cost-effective alternative for inland installations.
What torque specification applies to PV T-bolts?
Typical torque values for PV T-bolt connections: M8 = 16-20 Nm, M10 = 30-35 Nm. Always follow the mounting system manufacturer's specified torque values and use a calibrated torque wrench. Over-tightening can deform aluminium profiles; under-tightening risks module displacement under wind load.
What is a hanger bolt and where is it used?
A hanger bolt (Stockschraube) has a wood-thread section on one end and a metric thread on the other. It is driven into a timber rafter to create a threaded stud onto which the roof handle is mounted with a nut. Standard sizes for PV: M10 x 200 mm and M12 x 250 mm, in A2 stainless or galvanized steel.
Why is equipment grounding important in PV systems?
Equipment grounding (Potentialausgleich) ensures all metallic components — frames, rails, clamps — are at the same electrical potential, preventing hazardous voltage build-up. Grounding plates and earthing connectors with serrated contact surfaces establish reliable electrical bonds. Grounding must comply with IEC 62548 and local electrical codes.
What EPDM washers are used in PV installations?
EPDM washers serve two purposes: sealing roof penetrations (under hanger bolts or lag screws) to prevent water ingress, and providing electrical isolation between dissimilar metals. Standard sizes: M8 (6.5 x 19 mm) and M10 (8 x 25 mm) with vulcanized EPDM bonded to a steel backing washer.
Does ULAMEX supply PV fasteners in bulk?
Yes. As a B2B wholesaler, ULAMEX supplies all fasteners in bulk packaging: 100, 250, 500 or 1000 pieces per box. Pallet delivery is available for larger quantities. Contact us for volume pricing and mixed-component orders.
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