Опис
DIN Grade 7 | S45C Steel | HRC 48–52 | Four-Side Ground
Induction Hardened Straight Rack with Surface Treatment
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.
What Is an Induction Hardened Straight Rack?
A straight rack is a flat, linear gear element that converts rotational motion from a pinion into precise straight-line movement — or vice versa. When manufactured from S45C medium-carbon steel and subjected to induction hardening, the tooth flanks reach a surface hardness of HRC 48–52 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 — particularly relevant in the wet and variable climate conditions typical across England, Scotland, and Wales.
Why Engineers Across the UK Specify This Rack
Case-Hardened Tooth Flanks
Induction hardening creates a hard, wear-resistant surface layer (HRC 48–52) whilst preserving a tough, shock-absorbing core — ideal for servo-driven axes experiencing rapid direction reversals.
DIN 8 Grade 7 Precision
Ground to Grade 7 tolerances on all four faces, guaranteeing consistent pitch and profile accuracy across the full length — critical when splicing multiple rack sections on long travel axes.
Dual Surface Treatment Options
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.
Wide Module Range
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.
Custom Drilling & Lengths
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.
Traceable Material Certification
Each batch is accompanied by material test reports verifying chemical composition and mechanical properties of the S45C steel stock — supporting quality audit requirements common in UK Tier-1 supply chains.
Material, Working Principle & Application Scenarios
Material: S45C Medium-Carbon Steel
S45C (equivalent to C45 / EN8) is selected for its balanced carbon content of approximately 0.42–0.48%, 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 48–52 — 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.
Working Principle: Rack & Pinion Linear Drive
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 — 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.
Where This Rack Is Used
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.
Technical Specifications
All dimensions in mm unless otherwise stated. Fp = cumulative pitch deviation (mm).
Customer Success: Real Applications, Real Results
UK and European customers across industrial sectors have trusted this straight rack in their most demanding applications.
A stamping press manufacturer based in Coventry was replacing worn feed rack sections on a progressive die transfer line operating at 42 strokes per minute. Their previous Grade 8 unhardened racks were showing measurable pitch wear after only eight months in service, causing registration errors and increased scrap rates. After switching to Module 4 induction hardened straight racks with phosphate finish, the same line reached 22 months before inspection was needed, with no measurable pitch deviation beyond the original Fp tolerance of 0.095 mm. The plant engineering manager estimated a reduction in downtime-related costs of roughly 35% over the first production year, not counting the improved scrap rate. Custom drilling to match their existing bed plate pattern was completed within seven working days of order placement — well within the project’s turnaround window.
“We’ve been sourcing precision ground and induction hardened racks for our gantry routers for three years now. Pitch consistency between joined sections is excellent, which is what matters most on a 6-metre cutting table.”
— Technical Procurement Manager, CNC Router OEM, Yorkshire, UK
“The phosphated finish held up surprisingly well inside our coastal facility near Aberdeen. Previous racks we used from a European distributor showed surface rust within months. These are still clean after 18 months — saves us maintenance cost.”
— Maintenance Engineer, Offshore Equipment Assembly, Aberdeen, Scotland
“Delivery on custom-drilled Module 6 racks was faster than any UK-stocked distributor quoted us, and the price was very competitive for the hardened grade. We’ll be using them across two more project lines this year.”
— Head of Engineering, Automated Racking Systems Integrator, Bristol, England
Manufacturing Capability & Custom Solutions
Our production facility is equipped with CNC gear hobbing lines, induction hardening stations, and multi-axis surface grinding centres operating to ISO 9001 quality management standards. Every batch of S45C bar stock is sourced from certified mills, and incoming material is verified by spectrometer analysis before production commences. The induction hardening process is PLC-controlled, with frequency and dwell time optimised per module to ensure consistent case depth across the full tooth profile — not just at the tip. This level of process control is what separates an industrial-grade straight rack from commodity alternatives that may carry the same material designation on paper.
Beyond standard catalogue sizes, our customisation programme covers: non-standard lengths (including half-metre increments for special machine beds), custom hole patterns matched to your installation drawing, chamfered or relieved ends for butted-joint installation, special tooth modifications including relieved tips for smooth mesh entry, and alternative surface treatments for food-processing or cleanroom environments. Our engineering team works directly with UK OEM designers at the specification stage, providing DXF drawing verification and sample approval before full production runs. Minimum order quantities for custom variants are kept low to support prototype and small-batch projects — a practical consideration for bespoke machine builders who cannot absorb large inventory commitments.
Browse our range: Q&T Straight Rack — quenched and tempered for high-impact applications; Precision Ground Straight Rack — four-side ground for tight positional tolerances in automation systems.
Frequently Asked Questions
What is the price of an induction hardened straight rack in the UK, and can I get a bulk discount for a CNC machine production run?
Pricing depends on module, length, and surface treatment selection. Standard catalogue sizes in Module 2 to Module 6 are the most cost-effective in volume. We provide tiered pricing for quantity orders — contact us at sales@farm-equipment-parts.com with your required specification and estimated annual volume for a formal quote.
How does an induction hardened straight rack differ from a through-hardened rack for heavy-duty UK industrial automation applications?
Through-hardening treats the entire cross-section uniformly, which can make the rack brittle under impact loads — a concern in any application with sudden load reversals. Induction hardening heats only the tooth zone, creating a hard surface whilst retaining a tough core. For UK automation lines with servo-driven axes, induction hardening is the preferred choice because it combines wear resistance with the fracture toughness needed for reliable long-term operation.
Which straight rack module size should I choose for a laser cutting gantry machine being installed at a fabrication workshop in Birmingham?
For most CO2 and fibre laser cutting gantries with axis loads up to 500 kg, Module 3 or Module 4 straight racks are the typical specification. Heavier portal-type machines with dual-axis drives may use Module 5 or 6. The key calculation is tangential load = torque / pinion pitch radius. We can assist with this calculation if you supply your servo motor torque rating and required travel speed.
Where can I find a reliable supplier of DIN 8 ground straight racks with fast delivery to England, Scotland, or Wales?
We supply DIN 8 Grade 7 induction hardened straight racks directly to UK buyers, with standard catalogue items typically dispatched within five to seven working days. Custom drilled or non-standard length items require additional lead time. Shipment is by air freight or sea freight depending on order volume. Send your drawing or specification to sales@farm-equipment-parts.com for a delivery estimate.
What is the expected service life of an S45C induction hardened straight rack used in a UK food processing conveyor transfer system?
Service life depends heavily on lubrication regime, cleanliness, pinion hardness, and load cycle. In a properly lubricated food conveyor application with the mating pinion also hardened to a similar grade, it is not uncommon to achieve five to eight years before measurable wear becomes a positioning concern. The blackened surface variant is appropriate where food-grade lubricants are used, as the treatment itself does not introduce contamination risk at the tooth contact surface.
Can I get a custom-length straight rack with a non-standard hole pattern for a bespoke agricultural machinery project based in East Anglia?
Yes — custom lengths and hole patterns are a standard part of our service. For agricultural machinery where the rack must bolt directly onto a fabricated steel frame, we can machine your specific hole positions and diameters to match your DXF drawing. Sample approval is available on request. East Anglia-based buyers are welcome to contact our team to discuss project requirements — email sales@farm-equipment-parts.com with your drawings attached.
Ready to Source?
Send your drawing or specification to our engineering team today.
📩 sales@farm-equipment-parts.com | DIN 8 Grade 7 Induction Hardened Straight Rack — UK B2B Supplier
