Lista completa de fixadores para construção africana.
Phase 1: Structural Steel Connection
Structural phase fasteners are load-bearing and critical to building safety: Anchor bolts (J-bolts, L-bolts) — M20/M24 for column base plates; embed in concrete during pour; specify HDG or 316 SS for coastal; quantity = 4 per column minimum. Structural hex bolts — M16/M20 Grade 10.9 for beam-to-column, beam-to-beam connections; specify HDG for outdoor exposed; quantity = per connection design (typically 4-8 per splice). Base plate shims — thin steel plates for leveling steel columns before grouting; size to match base plate. Shear studs — M19×100 Nelson studs for composite steel-deck floors; welded to beam flanges before deck installation. High-strength F1554 Grade 55 or 105 for anchor bolts in seismic zones.
Phase 2: Roofing and Cladding
Roofing fasteners must resist wind uplift and provide weather sealing: IBR/Trapezoidal roofing screws — #3 drill point, hex head with EPDM washer; 6mm (for 0.5mm sheet) or 8mm (for 0.8mm sheet) drill point; quantity = 4-6 per m² for roofs, 6-8 per m² for walls; always calculate based on wind zone. Side-lap screws — #2 drill point, pan head, 50mm long; one per lap rib at 500mm intervals. Ridge cap screws — same as roofing screws; install at both sides of ridge. Flashing nails — ring shank nails for securing flashing; hot-dip galvanized. For coastal areas (within 10km of ocean), specify stainless steel 304 roofing screws. For color-matched sheeting, specify polymer-coated in the correct RAL color — typically 500+ hours salt spray resistance.
Phase 3: Ceiling, Partition, and Drywall
Interior finishing fasteners: Drywall screws (coarse thread for wood, fine thread for metal studs) — #6×32mm for single-layer 12.5mm drywall to wood; #6×25mm for single-layer to metal studs; quantity ≈ 32-36 per 4×8 sheet. Ceiling channel (purlin) screws — #3 drill point, hex head, for ceiling grid to structural steel; M6×25mm for suspended ceiling Main Tees. Partition studs — No. 8 × 90mm bugle head screws for stud-to-track connections. Gyproc cornices —掰Gyproc screws for cornice fixing. Acoustic insulation clips — resilient channels for sound-rated partitions. For humid African environments (coastal, swimming pool buildings), use zinc-plated or stainless steel drywall screws to prevent corrosion staining.
Phase 4: Electrical and Plumbing Rough-In
Electrical and plumbing fasteners for building services: Conduit clamps — one-bolt conduit clamps (M6 or M8) for securing PVC conduit to walls/ceilings; sizes match conduit OD (20mm, 25mm, 32mm, 40mm). Trunking (cable tray) screws — M6×20mm pan head, zinc-plated, for securing trunking lid clips. Junction box screws — M3.5×20mm nickel-plated for electrical boxes. Pipe clips — single or two-bolt pipe clips (M8) for copper/PVC pipe support; sizes DN15-DN50. Strap iron (saddle iron) — 25×3mm hot-dip galvanized strap for pipe runs; nail or screw to wood/brick. Masonry anchors — wall plugs (rawlplugs) + wood screws for fixing to brick/concrete; sizes 6mm, 8mm, 10mm. Count: approximately 2 bags of mixed wall plugs (500g each) per 100m² of building.
Phase 5: Finishing and Fit-Out
Finishing phase fasteners — visible and often color-matched: Door and window frame screws — countersunk head, 100mm length for door frames to masonry/timber; specify stainless steel for coastal. Hinge screws — 30mm stainless steel screws for door hinges (replacing standard slotted with security head). Handrail brackets — M8 stainless steel screws for wall-mounting handrails. Sanitary ware — concealed fixing screws for toilets, basins, and bidets; stainless steel with white caps. Mirror fixings — special mirror clips with rubber buffer; stainless steel for humid bathrooms. Cabinet hinges — 15mm screws (provided with hinges usually). Skirting board nails — lost-head nails (brads) 50mm for timber skirtings; or grab screws for adhesive-fixed skirtings. For premium finishes in coastal Africa, specify stainless steel 316 for all visible fasteners to prevent rust staining.
Quick Quantity Estimation Guide
For estimating fastener quantities at construction planning stage: Rule of thumb — allow 25-40kg of mixed fasteners per 100m² of building (excluding structural steel). For roofing — allow 6-8 screws per m² of IBR roof sheeting (depending on wind zone); for cladding allow 8-10 per m². For drywall — allow approximately 1 kg of drywall screws per 10m² of drywall. For electrical — allow approximately 1 bag (500g) of wall plugs per 50m²; plus 1 box of cable clips per 100m² of building. These are estimates only — always verify against actual project specifications and structural engineer's requirements.
| Building Type | 100m² Fastener Weight | Key Categories |
|---|---|---|
| Residential (single story) | 25-30 kg | Roofing 40%, structural 20%, finishing 30%, other 10% |
| Residential (multi-story) | 30-40 kg | Structural 30%, drywall 25%, roofing 20%, other 25% |
| Commercial office | 35-50 kg | Drywall 30%, facade 25%, ceiling 20%, other 25% |
| Industrial warehouse | 20-25 kg | Roofing 50%, structural 30%, other 20% |
| Mining infrastructure | 50-80 kg | Structural 40%, mechanical 30%, electrical 20%, other 10% |
Perguntas Frequentes
What are Technical Guide and how are they used?
Technical Guide are essential components in construction and manufacturing. Proper selection depends on load requirements, environmental conditions, and material compatibility.
How do I choose the right fastener for my project?
Consider the material being fastened, load requirements, environmental exposure, and applicable standards. Consult with a professional if unsure about specifications.
What materials are available for these fasteners?
Common materials include carbon steel, stainless steel, alloy steel, and specialty alloys. Each offers different strength, corrosion resistance, and cost characteristics.
Do you offer custom manufacturing?
Yes, we offer custom fastener manufacturing to spec. Contact our sales team with your requirements for pricing and lead times.
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