Lesson 1Deadbolt types and dimensions: single-throw vs double-throw, bolt materials and typical diametersWe go look at deadbolt designs for steel doors, compare single-throw and double-throw mechanisms. We go check bolt materials, diameters, throw length, latch guards, and how to match dem with cylinders, strikes, and security standards.
Single-throw vs double-throw mechanismsBolt materials, hardness, and corrosionBolt diameter, throw length, and clearancesStrike plates, boxes, and reinforcementCompatibility with cylinders and escutcheonsLesson 2Corrosion protection options: galvanizing, paint systems, powder coat, surface prep standardsDis go explain how corrosion dey attack steel doors, den compare galvanizing, liquid paint, and powder coating. We go cover surface prep standards, film thickness, inspection, and how to pick protection for di environment and how long e go last.
Atmospheric corrosion and exposure categoriesHot-dip galvanizing vs electro-galvanizingLiquid paint systems and zinc-rich primersPowder coating process and curing controlSurface prep grades per ISO and SSPCLesson 3Hinges and pivot hardware for high-use doors: butt hinges, continuous hinges, pin types, security hinge optionsWe go check hinge and pivot options for high-use steel doors. Compare butt and continuous hinges, pivot sets, pin and bearing types, security features, and sizing based on door weight, how often e dey use, and fire or escape rules.
Butt hinge types, knuckle count, and sizingContinuous hinges for high-cycle applicationsFloor and top pivots for heavy doorsSecurity hinges, studs, and non-removable pinsBearing types, lubrication, and maintenanceLesson 4Fasteners and anchors to concrete: mechanical anchors, chemical anchors, anchor sizing and embedment depthsDis go describe mechanical and chemical anchors for fixing steel frames to concrete. Cover base material check, anchor sizing, embedment depth, edge distances, load paths, and installation ways to avoid loosening or cracking.
Concrete strength, cracking, and inspectionExpansion anchors and sleeve anchorsAdhesive anchors and curing conditionsEmbedment depth, spacing, and edge distanceTorque, installation, and pull-out testingLesson 5Standard steel profiles: rectangular tube, square tube, angle irons, flat bars—dimensions, wall thicknesses, and use casesDis go detail common hollow and solid steel profiles for door frames, stiffeners, and reinforcing. Check dimensional series, wall thickness ranges, tolerances, and how profile choice affect strength, weight, and fabrication work.
Rectangular and square hollow section rangesAngle irons for frames and edge stiffenersFlat bars for strike, hinge, and lock platesWall thickness vs load and weld distortionSpecifying tolerances and mill certificatesLesson 6Materials selection checklist for warehouse entrance doors (weight, security rating, cost)Dis provide practical checklist for choosing materials for warehouse entrance doors. Balance weight, security rating, corrosion resistance, fire and egress needs, hardware match, and total installed and lifecycle cost.
Door leaf gauge, profiles, and reinforcementsFrame type, anchors, and substrate checksLocking, cylinders, and access controlCorrosion protection and environment classBudget, lifecycle cost, and maintenanceLesson 7Standard cylinder lock types for metal doors: euro-profile, rim cylinder, tubular, mortise cylinders—dimensions and backsetDis cover main cylinder formats for metal doors, like euro-profile, rim, tubular, and mortise cylinders. Explain dimensional standards, backset, cam types, keying options, and match with multipoint and panic hardware.
Euro-profile cylinder dimensions and camsRim cylinders for surface-mounted locksTubular cylinders and keyway optionsMortise cylinders and thread standardsBackset, center distance, and door prepLesson 8Sheet thickness selection for door leafs and frames: 1.5–6 mm ranges, tradeoffs between weight and securityDis guide selection of sheet thickness for door leaves and frames from 1.5–6 mm. Talk about stiffness, dent resistance, weight, hinge loading, and security performance, including typical gauges for industrial, fire, and high-security doors.
Typical gauge ranges for leaves and framesDeflection, dent resistance, and span limitsWeight impact on hinges and closersSecurity, burglary, and fire rating needsCost and fabrication implications by gaugeLesson 9Common structural steels for doors: S235, S275, mild steel properties and selection criteriaDis introduce common structural steels for doors, like S235, S275, and mild steel grades. Discuss yield strength, weldability, toughness, coating behavior, and how to pick grades for frames, leaves, and reinforcing plates.
Mechanical properties of S235 and S275Mild steel chemistry and weldabilityFormability for bends, hems, and profilesCoating performance and galvanizing issuesSelecting grades for frames and stiffeners
