Lesson 1Deadbolt types and dimensions: single-throw vs double-throw, bolt materials and typical diametersCheck out deadbolt designs fi steel doors, comparin single-throw an double-throw setups. Look at bolt materials, diameters, throw length, latch guards, an how fi match wid cylinders, strikes, an 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 standardsExplain corrosion pon steel doors, den compare galvanizin, liquid paint, an powder coat. Cover surface prep standards, film thickness, inspection, an how fi pick protection fi di environment an service life.
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 optionsLook at hinge an pivot choices fi high-use steel doors. Compare butt an continuous hinges, pivot sets, pin an bearin types, security features, an sizin base pon door weight, use frequency, an fire or escape needs.
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 depthsTell bout mechanical an chemical anchors fi fix steel frames to concrete. Cover base material check, anchor sizin, embedment depth, edge distances, load paths, an install practices fi avoid loosenin or crackin.
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 casesDetail common hollow an solid steel profiles use inna door frames, stiffeners, an reinforcin. Check dimensional series, wall thickness ranges, tolerances, an how profile pick affect strength, weight, an 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)Gih yuh a practical checklist fi choose materials fi warehouse entrance doors. Balance weight, security ratin, corrosion resistance, fire an egress needs, hardware match, an total install an 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 backsetCover main cylinder formats use inna metal doors, like euro-profile, rim, tubular, an mortise cylinders. Explain dimensional standards, backset, cam types, keyin options, an match wid multipoint an 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 securityGuide pick sheet thickness fi door leaves an frames from 1.5–6 mm. Talk bout stiffness, dent resistance, weight, hinge loadin, an security performance, includin typical gauges fi industrial, fire, an 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 criteriaIntroduce common structural steels fi doors, like S235, S275, an mild steel grades. Discuss yield strength, weldability, toughness, coat behavior, an how fi pick grades fi frames, leaves, an reinforcin 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
