What module (pitch) is standard for sliding gate gear racks?

Module 4 (M4) is the global standard for residential and light commercial sliding gate gear racks. M4 means the distance between adjacent teeth is 4π mm (≈12.57 mm). Most automatic gate motor brands — FAAC, CAME, BFT, Nice, and others — use M4 pinions, so M4 racks are universally compatible.

What are the two main types of sliding gate gear racks?

The two main types are nylon (plastic) gear racks and steel (metal) gear racks. Nylon racks run quietly, resist corrosion, and suit residential gates up to 500 kg. Steel racks handle heavier loads (500 kg+) and high-cycle commercial applications, but produce more noise. HST's nylon racks include a steel core for added strength.

How long is one gear rack section?

Each gear rack section is 1,000 mm (1 metre) long. Half-tooth ends allow sections to be joined end-to-end without losing tooth pitch, ensuring smooth motor travel across joints. For a 4-metre gate opening, you need 4 sections plus a small allowance for the gate's travel overrun.

What is the MOQ for gear racks from HST?

The standard minimum order quantity (MOQ) for both nylon and steel gear racks is 500 pieces per model. Mixed-model orders can be combined to reach the MOQ threshold. Contact HST for stock availability on smaller trial orders.

What Is a Sliding Gate Gear Rack? Function, Types & How It Works

Q: What is a sliding gate gear rack?

A sliding gate gear rack is a straight toothed bar (rack) that is fixed to the bottom or side of a sliding gate. The gate motor's pinion gear meshes with the rack's teeth; as the motor turns, the pinion walks along the rack, pushing the gate open or closed. It is the core power-transmission component in any automatic sliding gate system.

A sliding gate gear rack is the toothed component that converts motor rotation into gate movement. This guide explains how it works, the difference between nylon and steel racks, and key specs to check before ordering.

Published: 2026-07-01 · 5 min read

What Is a Sliding Gate Gear Rack?

A sliding gate gear rack is a straight, toothed bar that is fixed along the bottom rail or side frame of a sliding gate. When an automatic gate motor is installed, its output shaft carries a small round gear called a pinion. The pinion meshes with the teeth of the rack; as the motor rotates, the pinion walks along the rack, converting rotational motion into the linear movement that opens or closes the gate.

Without a gear rack, an automatic sliding gate cannot function. The rack is the mechanical interface between the motor and the gate panel.

How Does a Gear Rack Work?

The operating principle is a standard rack-and-pinion mechanism:

The gate motor is mounted on a post or pillar beside the gate opening.
The motor's pinion gear protrudes downward and engages the rack teeth on the gate.
When the motor turns clockwise, the pinion pushes the rack (and gate) in one direction; counter-clockwise reverses the motion.
Limit switches or encoder feedback tell the motor when to stop at the fully open or fully closed position.

The quality of the gear rack directly affects how smoothly and quietly the gate operates, how long the motor lasts, and how reliably the gate performs over thousands of cycles.

Module (Pitch): Why M4 Is the Standard

Gear racks are specified by their module, which defines the size of the teeth. Module 4 (M4) is the global standard for sliding gate applications. M4 means each tooth occupies a pitch of 4π mm (≈12.57 mm). The vast majority of gate motor brands — FAAC, CAME, BFT, Nice, Somfy, and others — manufacture their pinion gears to M4 specification, making M4 racks universally compatible.

Some heavy-duty industrial applications use M6 or M8 racks for higher load capacity, but M4 covers the residential and light commercial market.

Nylon Gear Rack vs Steel Gear Rack

Property	Nylon Gear Rack	Steel Gear Rack
Noise level	Low (quiet operation)	Higher (metal-on-metal)
Corrosion resistance	Excellent (no coating needed)	Requires galvanizing or coating
Load capacity	Up to 500 kg gate weight	500 kg and above
Typical application	Residential, coastal environments	Commercial, industrial, high-cycle
HST model	NGR-6L (steel-core nylon)	SGR-0930, SGR-1230, etc.

Key Specifications to Check Before Ordering

Module: Confirm M4 matches your motor's pinion.
Section length: Standard 1,000 mm; verify with your gate width.
Material: Nylon for quiet/coastal, steel for heavy/high-cycle.
Surface finish (steel racks): Black oxide, zinc-plated, or hot-dip galvanized.
MOQ: 500 pcs per model for wholesale orders.

Where to Buy Wholesale Gear Racks

Hangzhou Sai Tong I/E Co.,Ltd (HST) is a specialist manufacturer of sliding gate gear racks, supplying distributors, contractors, and OEM brands in 30+ countries. Both nylon and steel gear racks are available with ISO 9001 certification, OEM/ODM capability, and standard lead times of 30 days.

View our full gear rack range or request a wholesale quote.