{"id":1105,"date":"2026-08-27T06:16:01","date_gmt":"2026-08-27T06:16:01","guid":{"rendered":"https:\/\/www.farm-equipment-parts.com\/?post_type=product&p=1105"},"modified":"2026-08-27T06:16:01","modified_gmt":"2026-08-27T06:16:01","slug":"precision-ground-helical-rack","status":"publish","type":"product","link":"https:\/\/www.farm-equipment-parts.com\/el\/product\/precision-ground-helical-rack\/","title":{"rendered":"Precision Ground Helical Rack"},"content":{"rendered":"
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DIN6 Grade 5 \u00a0|\u00a0 S45C \/ 42CrMo \u00a0|\u00a0 HRC 48\u201355<\/span><\/div>\n

Precision Ground Helical Rack<\/h2>\n

Helix Angle 19\u00b031’42” \u00a0|\u00a0 Four-Side Ground + Tooth Surface Ground \u00a0|\u00a0 High-Load Linear Transmission<\/p>\n

Trusted by UK automation engineers, machine builders and OEMs across Europe<\/p>\n<\/div>\n

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\"PrecisionWhen a linear drive system has to deliver both accuracy and sustained load capacity, the choice of rack becomes the most consequential engineering decision on the machine. Our Precision Ground Helical Rack is manufactured to DIN6 Grade 5 tolerances, combining a precisely controlled helix angle of 19\u00b031’42” with a four-side flat-ground body and a fully ground tooth flank surface. The result is a helical rack that delivers noticeably lower noise, smoother motion and higher torque transmission efficiency compared with standard cut or milled alternatives \u2014 without adding complexity to the mounting arrangement.<\/p>\n

The rack is produced in two core material grades \u2014 S45C medium-carbon steel for general industrial use and 42CrMo alloy steel for demanding high-load or shock-heavy applications. Both are heat-treated to achieve a surface hardness of HRC 48\u201355: the S45C variant through induction hardening and the 42CrMo grade through carburising and case hardening. After hardening, every rack undergoes precision four-side flat grinding followed by dedicated tooth-face grinding to restore geometry and eliminate distortion introduced during heat treatment \u2014 a production step that separates genuine precision racks from those simply labelled as such.<\/p>\n

Available in modules from 1.5 to 12 and in standard lengths of 500 mm or 1,000 mm, these helical racks are widely used in CNC gantry systems, high-speed linear axes, robotic transfer units and heavy-duty portal structures. Drill-hole patterns are included as standard; no-hole variants (suffix “N”) are available on request. Custom dimensions, materials and special configurations can be arranged directly with our engineering team.<\/p>\n<\/div>\n

\u2709\u00a0 Get a Quote Now<\/a><\/p>\n

Response within 24 hours \u00a0\u00b7\u00a0 Custom sizes available \u00a0\u00b7\u00a0 UK & EU delivery<\/p>\n<\/div>\n

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Why Engineers Choose This Helical Rack<\/h2>\n
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DIN6 Grade 5 Accuracy<\/div>\n
Tooth pitch and profile tolerances held to DIN6 Grade 5, ensuring repeatable positioning and minimal backlash in closed-loop systems.<\/div>\n<\/div>\n
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Reduced Operating Noise<\/div>\n
The helical tooth form introduces gradual tooth engagement, cutting vibration and noise levels compared with straight racks \u2014 critical for precision machine tools and cleanroom environments.<\/div>\n<\/div>\n
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HRC 48\u201355 Surface Hardness<\/div>\n
Induction hardening (S45C, HRC 48\u201352) or carburising (42CrMo, HRC 50\u201355) followed by precision grinding delivers wear resistance without sacrificing dimensional stability.<\/div>\n<\/div>\n
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Four-Side + Tooth Ground<\/div>\n
All four body faces and the active tooth surface are ground after heat treatment, correcting any distortion and delivering a flat, square mounting surface for precise rail alignment.<\/div>\n<\/div>\n
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Higher Load Capacity<\/div>\n
Multiple teeth in simultaneous contact distribute force across a larger area, allowing the helical rack to carry greater tangential loads than an equivalent-module straight rack in the same installation envelope.<\/div>\n<\/div>\n
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Flexible Configuration<\/div>\n
Standard drill patterns included; no-hole versions available. Modules 1.5\u201312 in 500 mm and 1,000 mm lengths. Custom material, length and cross-section profiles manufactured to drawing.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Material, Design Principle & Application Scenarios<\/h2>\n
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\u25b6 How the Helical Rack Works<\/h3>\n

A helical rack converts rotary motion from a mating helical pinion into precise linear displacement. Unlike a straight rack where the full tooth width engages instantaneously, the angled tooth form of our helical rack (helix angle 19\u00b031’42”) allows engagement to progress gradually across the tooth face. This overlap increases the contact ratio, spreads load more evenly, and suppresses the impulse forces that cause vibration and pitch error accumulation in high-speed or high-load straight rack drives. The right-hand helix direction is consistent across all standard models, making the mating pinion selection straightforward.<\/p>\n<\/div>\n

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\u25b6 Material Selection Guide<\/h3>\n

S45C (Induction Hardened, HRC 48\u201352): Medium-carbon steel with good machinability and adequate toughness for the majority of general automation, gantry crane travel, and conveyor drive applications. Cost-effective for high-volume machine builds where ultra-high-cycle fatigue is not the dominant failure mode.<\/p>\n

42CrMo (Carburised, HRC 50\u201355): Chromium-molybdenum alloy steel providing superior core strength and impact toughness alongside the highest surface hardness available in this product range. The preferred choice for heavy CNC machining centres, forging transfer lines, stone-cutting portals and other applications subject to shock loads or abrasive environments.<\/p>\n<\/div>\n

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\u25b6 Typical Application Sectors<\/h3>\n