Description
Precision Power Transmission · UK Industrial Supply
Zero Backlash Rack — STLBX Series
Four-sided ground, induction-hardened, chrome-plated rack for applications demanding zero play and maximum positional accuracy — trusted by UK engineers across CNC, automation and heavy-duty linear drive systems.
The zero backlash rack — commercially referenced under the STLBX coding system — is engineered to eliminate positional error in linear drives where every micron counts. Unlike conventional racks, which tolerate small gaps between mating teeth, the STLBX zero backlash rack is precision-ground on all four faces, heat-treated to HRC 48–52, and surface-finished with a black chrome coating that resists oxidation and reduces friction simultaneously. The result is a rack that delivers repeatable, backlash-free motion for the working life of the machine — not just at commission, but after years of duty. Whether you are designing a gantry router, a servo-driven press feed, or an automated warehouse shuttle, a zero backlash rack in the driveline removes the accumulated error that otherwise degrades part quality and cycle times.
Why Backlash Matters — and How We’ve Eliminated It
Backlash in a rack-and-pinion system is the clearance between the flanks of meshing teeth. In servo-controlled axes, even 0.05 mm of backlash translates to positioning error, reversal lag, and vibration at direction change. For UK manufacturers producing to tight tolerances — automotive sub-assemblies, electronics enclosures, specialist tooling — this is not a theoretical problem. It shows up as scrap, rework and machine downtime. The STLBX zero backlash rack addresses the issue at source: precision grinding of the tooth profile eliminates the excess clearance built into standard cut racks. The tooth geometry is matched to precision helical pinions, spreading load across multiple teeth simultaneously. Combined with the four-sided ground body (which keeps the rack straight and co-planar with its mounting surface), this design delivers true zero backlash performance under both light and heavy dynamic loads.
Precision Ground Tooth Profile
CNC profile grinding to DIN 6 equivalent — tooth geometry is accurate, not merely cut and hobbed.
Induction Hardened HRC 48–52
Selective hardening of tooth flanks maximises wear resistance while keeping the core ductile — no brittle fracture risk under shock load.
Black Chrome Surface Finish
Electroplated black chrome provides corrosion protection and a low-friction running surface — important in humid UK workshop environments.
Four-Sided Ground Body
All four faces are ground flat — mounting face straightness and co-planarity of the tooth datum are guaranteed for the full rack length.
Hole-Free Option Available
Add suffix “N” to any model code (e.g. STLBX1610-N) to order without fixing holes — ideal when you’re drilling your own bolt pattern on-site.
Custom Dimensions on Request
Non-standard length, module or material can be produced to drawing — full custom machining capability backed by in-house engineering.
Related Precision Rack Products
Not every application calls for a zero backlash configuration. If your drive system uses a standard servo with electronic backlash compensation, or if the load path is predominantly unidirectional, a surface-treated or precision-ground alternative may offer a better cost-to-performance balance. The two most popular options from our UK B2B range are:
Induction Hardened Helical Rack with Surface Treatment
Helical cut teeth with surface hardening and protective treatment — the workhorse choice for medium-precision CNC routers and portal systems throughout the UK.
Precision Ground Helical Rack
Helical tooth geometry ground to DIN-grade tolerances for high-speed linear axes where smooth, quiet operation and long tooth life are the priorities.
Technical Specification
Dimension unit: mm | All specifications subject to engineering confirmation prior to order placement.
Material & Surface Treatment
| Material | S45C Medium Carbon Steel |
| Hardness Treatment | Induction Hardening HRC 48–52° |
| Manufacturing Process | Four-sided surface grinding, black chrome plated |
| Hole-Free Option | Available — append “N” to model code (e.g. STLBX1610-N) |
STLBX Series Dimensional Parameters (Unit: mm)
| Code | Module | L | Tooth No. | B | A0 | A1 | D | D1 | Hole No. | A | C |
|---|---|---|---|---|---|---|---|---|---|---|---|
| STLBX 1610 | 16 | 992 | 62 | 12 | 30.5 | 20.2 | 96 | 16 | 11 | 7 | 7 |
| STLBX 2010 | 20 | 1000 | 50 | 16 | 42 | 29 | 100 | 50 | 10 | 10 | 9 |
| STLBX 2510 | 25 | 1000 | 40 | 19 | 48 | 31.5 | 100 | 50 | 10 | 12 | 11 |
Note: All specifications subject to change without prior notice. Please confirm with our engineering team before placing an order. Custom dimensions and materials are available to drawing.
Where the STLBX Zero Backlash Rack Is Used
The zero backlash rack finds its home anywhere a linear axis must deliver repeatable, bi-directional accuracy. In CNC machining centres across the UK Midlands, STLBX racks drive the gantry of large-format routers processing aluminium and composites — where a 0.03 mm positional deviation produces a visible stepped artefact on the finished surface. In automated assembly lines at automotive Tier 1 suppliers, zero backlash racks power the feed axes of robotic welding and riveting stations, ensuring the robot repeats its approach point to within microns shift-after-shift. Precision laser cutting machines, particularly fibre laser systems serving UK sheet metal fabricators, use zero backlash drive trains to keep the cut beam positioned exactly at the programmed path during high-speed cornering. Warehouse automation is another fast-growing area: shuttle systems in automated storage and retrieval installations demand a drive that neither drifts nor judders at the destination shelf position. The STLBX rack, mated with a backlash-free planetary gearbox, is increasingly the UK system integrator’s first choice for this class of application.
Customer Success Stories
Real applications, real results — from across the UK manufacturing sector.
“We replaced the imported racks on our 3-metre gantry router with the STLBX 2010 series and the improvement was immediate. Step-over lines on aluminium panels that had been plaguing us for two years simply disappeared. Positional repeatability measured under 0.02 mm across the full travel — that is better than the machine’s ball-screw axes. The lead time was realistic and the technical data was complete enough for our integration team to work from straight away.”
— James Holt, Design & Build Director
Precision CNC Routing Ltd · Birmingham, West Midlands · Aerospace & Composites
“Our fibre laser shuttle needed a zero-backlash drive that could handle 3 g acceleration without chatter or reversal error. The STLBX 1610 was the only catalogue item that met our hardness and surface finish specification without going to full custom. We have been running 18-hour shifts for eight months and tooth wear is negligible. The chrome finish still looks clean — no rust in our damp workshop, which is a genuine win.”
— Fiona McAllister, Automation Engineering Lead
Claymore Sheet Metal Systems · Glasgow, Scotland · Industrial Laser Fabrication
“As an OEM integrating these racks into a warehouse shuttle product that goes to multiple UK logistics customers, consistency is everything. Every STLBX 2510 we have received meets spec — the four-sided ground finish makes alignment straightforward and the customer’s site team can install without specialist tools. We asked about a custom hole pattern for one project and the supplier turned around confirmed drawings within 48 hours. That kind of support makes them a genuine long-term partner.”
— Tom Bradshaw, Head of Mechanical Engineering
Nexline Automation Solutions · Leeds, Yorkshire · Intralogistics OEM
Manufacturing Capability & Custom Solutions
The STLBX series is manufactured in a dedicated precision grinding facility using CNC profile grinding centres with in-process gauging and 100% hardness spot-checking of each batch. The factory’s quality system traces every rack to its raw material heat number — critical documentation for UK customers supplying into regulated industries such as aerospace, rail and medical devices. Beyond the standard range, the facility operates full custom production capability: if your application requires a module not listed in the catalogue, a different rack length, a one-sided chamfer, a specific counterbore pattern, or an alternative steel grade (stainless grades are available for corrosive environments), the engineering team can work from your DXF or STEP file to deliver a confirmed drawing within 48 hours of enquiry. Prototype batches are accepted from single pieces; volume production breaks are clearly documented so your procurement team can plan buffer stock efficiently. UK distributors and machine builders are particularly welcome — OEM pricing tiers are available on written request.
Custom Module & Length
Non-standard sizes to drawing — module 1 to 32
Drawing Confirmation in 48 h
DXF / STEP upload to confirmed dimensional drawing
Material Traceability
Heat number records and material cert on request
OEM & Distributor Pricing
Volume tier pricing for UK machine builders
Frequently Asked Questions
Common questions from UK engineers and procurement teams about zero backlash racks.
What is the price range for a zero backlash rack supplier in the UK, and how do I get a quick quote for my CNC project?
Pricing for the STLBX series depends primarily on module size and order quantity. Typically, standard catalogue models are competitively priced compared with European alternatives and include UK-compatible documentation. The fastest way to get a confirmed price is to email sales@farm-equipment-parts.com with your model code, quantity, and any custom requirements — you will usually receive a quotation within one working day.
Which zero backlash rack module should I choose for a servo-driven gantry machine operating in a UK sheet metal factory?
For a typical servo gantry in sheet metal fabrication, module 20 (STLBX 2010) is the most common selection. It balances tooth strength for the dynamic forces of rapid acceleration against the positional accuracy required for tight-tolerance cut paths. If your axis is carrying heavier loads or spanning more than 6 metres, module 25 (STLBX 2510) is worth evaluating. Contact our engineering team with your servo torque and machine mass figures and we can give a confirmed recommendation.
How does induction hardening to HRC 48–52 affect the service life of a zero backlash rack compared with a standard cut rack?
Induction hardening of the tooth flanks creates a hard wear-resistant surface layer (typically 1.5 to 2.5 mm deep) while keeping the core tough and ductile. In practical service on CNC machines running two or three shifts per day, an HRC 48–52 induction-hardened rack will typically outlast a standard cut steel rack by a factor of four to six times under equivalent loading — which directly translates to lower lifecycle cost for the machine owner.
Where can I find a reliable zero backlash rack supplier in the UK who can also handle non-standard lengths and custom hole patterns?
farm-equipment-parts.com supplies the STLBX zero backlash rack range to UK industrial customers with full custom production capability. Non-standard rack lengths, custom hole patterns, and alternative materials can be produced to your drawing. Enquiries can be sent directly to sales@farm-equipment-parts.com — drawing confirmation typically comes back within 48 working hours of receiving your CAD file.
When is it worth upgrading from a standard helical rack to a zero backlash rack on an automation machine in the UK logistics sector?
The upgrade is worth making when your system requires bi-directional positional accuracy tighter than roughly 0.05 mm, when the axis changes direction under closed-loop control (as in AS/RS shuttles), or when accumulated error from backlash is causing product mis-positioning. For logistics shuttle applications across UK warehouses, zero backlash racks are now considered best practice, because the positional error of a standard rack — though small — compounds over thousands of cycles and causes missed shelf picks or mechanical overloading at the stops.
Ready to eliminate backlash from your linear axis?
Send us your application details for a personalised recommendation and competitive UK price.
edit by gzl
