Fixed solar tile roof hook

Specifications

Product Specification Sheet
Product Name	Fixed Type One-Piece Bent Solar Tile Roof Hook for PV Mounting Rails
Part No.	SRH-F01
Category	Solar mounting brackets
Overview	SRH-F01 is a one-piece press-bent Z/S-shaped tile roof hook that fixes aluminium PV mounting rails onto timber rafters under clay or concrete roof tiles. It is formed from a single SUS304 stainless steel plate with no welding at all, then shot-blasted and pickled/passivated for long-term outdoor corrosion resistance.
Version	V1.0 \| 2026-09-15
Material
Main material	SUS304 stainless steel, single-piece bent plate （no welded joint）
Grade and standard	SUS304 / AISI 304 / EN 1.4301; plate per ASTM A240, EN 10088-2 or GB/T 3280
Alternative material	SUS316L （EN 1.4404） for coastal or industrial chloride exposure; Q235B / Q355B carbon steel with hot-dip galvanizing for inland cost-sensitive projects
Raw material form and thickness	Cold-rolled stainless steel plate/strip, 5 mm （0.197 in） thick, strip width 30 mm （1.181 in）
Mechanical properties	Tensile strength ≥ 515 MPa, yield strength ≥ 205 MPa, elongation ≥ 40 %
Material certificate	Mill test certificate （MTC） with heat number, chemical composition and mechanical data for each production lot; PMI re-check on request
Service environment and design life	Rural and C4-class outdoor exposure, 25-year design service life when installed with matched SUS304 fasteners
Process
Cutting	CNC laser cutting （or precision blanking） of the flat strip to the unfolded profile, burr-free blank
Forming （bending）	One-piece press bending on CNC press brake: 3–4 consecutive 90° bends forming the Z/S tile-clearing offset and the hook head returned over the arm
Joining	No welding — single-piece bent part; rail and rafter connections are made on site with M8/M10 stainless steel bolts
Secondary machining	All slots cut in the flat state before bending: 3–4 base slots 11 × 25 mm （0.433 × 0.984 in） + 1 rail slot 11 × 25 mm; then deburring and chamfering to R0.5 mm
Surface pre-treatment	Alkaline degreasing and rinse before blasting; no weld spatter or heat tint to remove on this weld-free part
Key process control points	Bend sequence and bend-line position control the tile clearance height; punch/slot-to-bend registration ensures slot alignment; inner radius R5 mm avoids stress cracking
Process route	Plate incoming inspection → laser cutting → deburring → press bending → shot blasting → pickling and passivation → 100 % visual + dimensional check → packing
Surface treatment
Treatment method	Shot blasting （bead blasting） + pickling and passivation; no painting or plating
Coating or layer thickness	Passive film only （no measurable coating thickness）; carbon-steel alternative: hot-dip galvanizing 65–85 µm （2.6–3.3 mil）
Color and appearance	Uniform matte silver-grey, non-reflective, no spangle, no scratch, dent, rust spot or oil stain
Standard and salt spray	Passivation per ASTM A967 / GB/T 25150; neutral salt spray （NSS, ASTM B117） ≥ 480 h without red rust on the hook body
Surface roughness	Ra 1.6–3.2 µm after shot blasting
Pre-treatment	Alkaline degreasing → water rinse → acid pickling （iron-free acid） → passivation → DI water rinse → hot-air drying
Tolerance
Overall profile tolerance	General tolerance ISO 2768-m / GB/T 1804-m; overall length ±1.0 mm （0.039 in）, overall height ±1.0 mm （0.039 in）
Hole diameter and position	Slots 11 × 25 mm （0.433 × 0.984 in）, tolerance +0.3/0 mm; hole-to-hole position ±0.5 mm （0.020 in）; edge distance ≥ 1.5 × thickness
Bend angle and radius	Bend angle ±1°; inner bend radius R5 mm ±0.5 mm （0.197 ± 0.020 in）; bend-line position ±0.5 mm （0.020 in）
Weld position tolerance	Not applicable — weld-free one-piece part, no weld inspection required
Flatness and straightness	Base plate flatness ≤ 0.5 mm per 100 mm （0.020 in / 3.937 in）; arm straightness ≤ 1.0 mm over full length
Assembly and adjustment fit	Lateral adjustment travel ±12.5 mm （0.492 in） from the long slots; tile clearance height held within ±2 mm （0.079 in）
Dimensional basis	Dimensions shall follow the customer drawing and technical agreement; all values above are industry recommended values for reference only
Packaging
Surface protection	Each piece interleaved with kraft paper or VCI film; never stacked against carbon steel to avoid galvanic contamination
Inner packaging	Single piece in PE bag or shrink film, 25 pcs per inner carton
Outer packaging	5-ply export corrugated carton on fumigation-free plywood pallet, PP strapping, corner protection
Quantity, carton size and gross weight	100 pcs per carton; carton 400 × 300 × 250 mm （15.75 × 11.81 × 9.84 in）; gross weight approx. 28 kg （61.7 lb）
Marking and shipping marks	Part no. SRH-F01, product name, quantity, lot/batch no., production date, customer shipping mark and MADE IN CHINA
Container loading and stacking	Pallets stackable up to 5 layers; 1 × 20' GP holds approx. 20 pallets （about 2,000 pcs）
Storage and transport	Store indoors, dry, away from chloride and carbon steel contact; keep original packaging until installation; prevent moisture and impact damage
Quality control
Incoming inspection	MTC review plus PMI/chemical verification for SUS304, thickness check 5 mm ±0.2 mm, surface and flatness check on every coil/sheet lot
First article approval	Full first article inspection （FAI） with dimensional report before mass production; customer or third-party witness on request
In-process inspection frequency	Patrol inspection every 2 hours during cutting and bending; key dimensions checked with go/no-go gauges at 100 % frequency
Final and outgoing inspection	Sampling per GB/T 2828.1 / ISO 2859-1, AQL 1.0 （major） / 2.5 （minor）; 100 % visual plus sampled dimensional check
Inspection equipment	Digital caliper and micrometer, height gauge, radius gauge, bend-angle protractor （or CMM）, roughness tester, salt spray test chamber
Records and reports	Batch inspection report, dimensional report, mill test certificate and salt spray test report issued per shipment and traceable by lot number
Nonconforming product handling	NCR issued with rework or scrap disposition; re-bending of cracked or over-bent parts is prohibited to preserve material integrity
Quality system and certificates	Manufactured in an ISO 9001:2015 certified plant in Shandong, China; PPAP-style documentation available on request; no third-party certificate number is claimed unless issued for the specific order
Notes	The parameters listed in the table are standard values based on product photographs and our factory's standard manufacturing processes. For items marked as "Recommended Values," as well as all dimensions, materials, and tolerances, the final specifications shall be determined by the customer's drawings (2D/3D), technical agreements, and the results of the first-article inspection.
Drawing Format	3D: .step / .stp / .igs 2D: .dxf / .dwg / .pdf
For Quotation	Drawing + material + surface treatment + quantity + tolerance requirement