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DIN Grade 7 | S45C Steel | HRC 48\u201352 | Four-Side Ground<\/p>\n
Induction Hardened Straight Rack with Surface Treatment<\/h1>\n
Engineered for demanding linear motion applications across UK manufacturing, automation, and agricultural machinery sectors. Ground on all four sides, surface-treated for long service life.<\/p>\n
Get a Quote<\/a><\/p>\n<\/div>\n<\/div>\n <\/p>\n <\/p>\n Case-Hardened Tooth Flanks<\/strong><\/p>\n Induction hardening creates a hard, wear-resistant surface layer (HRC 48\u201352) whilst preserving a tough, shock-absorbing core \u2014 ideal for servo-driven axes experiencing rapid direction reversals.<\/p>\n<\/div>\n DIN 8 Grade 7 Precision<\/strong><\/p>\n Ground to Grade 7 tolerances on all four faces, guaranteeing consistent pitch and profile accuracy across the full length \u2014 critical when splicing multiple rack sections on long travel axes.<\/p>\n<\/div>\n Dual Surface Treatment Options<\/strong><\/p>\n Choose blackening for in-plant environments or phosphating for elevated humidity and outdoor exposure. Both options provide rust inhibition without compromising dimensional tolerances at the tooth surface.<\/p>\n<\/div>\n Wide Module Range<\/strong><\/p>\n Available from Module 1.5 through to Module 12, covering light-duty precision positioning through to high-load agricultural and heavy machine applications in a single consistent product family.<\/p>\n<\/div>\n Custom Drilling & Lengths<\/strong><\/p>\n Mounting hole patterns, chamfers, and custom lengths are accommodated through our in-house machining centre. This eliminates costly secondary operations for UK OEMs working to tight project timelines.<\/p>\n<\/div>\n Traceable Material Certification<\/strong><\/p>\n Each batch is accompanied by material test reports verifying chemical composition and mechanical properties of the S45C steel stock \u2014 supporting quality audit requirements common in UK Tier-1 supply chains.<\/p>\n<\/div>\n<\/div>\n<\/div>\n <\/p>\n S45C (equivalent to C45 \/ EN8) is selected for its balanced carbon content of approximately 0.42\u20130.48%, which gives the steel sufficient hardenability for induction treatment. After selective heating of the tooth zone and rapid quenching, the transformed martensite layer reaches HRC 48\u201352 \u2014 hard enough to resist abrasive wear yet not so brittle that the rack becomes susceptible to chipping under shock loading. The remaining core stays at a normalised or lightly tempered condition, providing ductility and bending fatigue resistance. Surface roughness after grinding is typically Ra 0.8 or better, ensuring low friction engagement with the mating pinion and predictable lubrication film retention.<\/p>\n<\/div>\n The straight rack engages with a cylindrical spur or helical pinion mounted on a driven shaft. As the pinion rotates, its teeth mesh progressively along the rack’s tooth pitch, translating rotational input into linear displacement. The relationship is simple: linear travel = pinion rotation (radians) x pinion pitch radius. This deterministic, backlash-controlled motion makes the rack-and-pinion pair superior to chain drives or belt drives in applications where positioning repeatability matters \u2014 such as plasma cutting gantries, packaging line transfer units, and automated warehouse picking systems widely deployed across the UK Midlands and North West manufacturing corridors.<\/p>\n<\/div>\n In the UK market, these induction hardened straight racks are found in CNC router and laser cutting machines, automated guided vehicles (AGVs) in fulfilment centres, robotic welding cells, agricultural equipment including planting and harvesting machinery, hydraulic press saddle drives, steel rack-and-pinion car park lifts, and stone or glass processing tables. The phosphated variants are particularly popular in Scottish and Welsh coastal industrial sites, where salt-laden air accelerates surface corrosion on untreated ferrous components. Food-processing facilities in the East of England have also adopted the blackened grade where incidental contact with moisture is a concern but food-grade lubricants are applied to the mating surfaces.<\/p>\n<\/div>\n<\/div>\n<\/div>\n <\/p>\n All dimensions in mm unless otherwise stated. Fp = cumulative pitch deviation (mm).<\/p>\n <\/p>\nWhat Is an Induction Hardened Straight Rack?<\/h2>\n
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A straight rack is a flat, linear gear element that converts rotational motion from a pinion into precise straight-line movement \u2014 or vice versa. When manufactured from S45C medium-carbon steel and subjected to induction hardening, the tooth flanks reach a surface hardness of HRC 48\u201352 while the core retains its toughness. The result is a component that resists pitting, wear, and dynamic impact loads that would quickly degrade a through-hardened or unhardened alternative. Our straight racks comply with DIN 8 Grade 7 tolerances and undergo four-side grinding, delivering the dimensional consistency required in CNC gantries, laser cutting machines, robotic arms, and heavy agricultural equipment. A blackening or phosphating surface treatment adds a further layer of corrosion protection \u2014 particularly relevant in the wet and variable climate conditions typical across England, Scotland, and Wales.<\/p>\n<\/div>\nWhy Engineers Across the UK Specify This Rack<\/h2>\n
Material, Working Principle & Application Scenarios<\/h2>\n
Material: S45C Medium-Carbon Steel<\/h3>\n
Working Principle: Rack & Pinion Linear Drive<\/h3>\n
Where This Rack Is Used<\/h3>\n
Technical Specifications<\/h2>\n
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