Square Linear Guideway Rail HGH20 67.72in Kit - Precise Linear Motion

Our review of the Square Linear Guideway Rail HGH20 67.72in kit finds it best suited for hobbyist and small shop CNC builds or DIY motion systems that need a sturdy, long-length square rail and two matching carriage blocks. The single biggest reason to buy is the combination of hardened high-carbon steel rail and Goethe-style four-point contact sliders, which deliver stable, low-friction linear motion and the ability to absorb minor mounting errors. This kit is straightforward to install and provides a cost-effective way to add precise, load-capable linear guidance to a router, mill or gantry project.

Key Features

• High-carbon steel rail: The hardened and tempered rail offers long-term wear resistance and strong bending resistance for straight, stable motion under load.
• Goethe-style four-point contact: The slider blocks distribute loads evenly in all directions and provide a self-aligning function to tolerate small assembly errors.
• Compatible carriage blocks: The included HGH20CA blocks use high-quality bearing steel and multiple steel balls for low friction and smooth travel.
• Length and customization: The 67.72in (1720mm) rail covers long spans and the manufacturer offers custom lengths or splice options for runs beyond standard sizes.
• Easy maintenance: The product is designed for simple upkeep; standard #46 grease is recommended to maintain performance.

Who It's For

This kit is aimed at makers, small CNC builders and light industrial users who need a long, square linear guide and reliable carriage blocks for gantry machines, router tables or bespoke automation rigs. The 20mm profile and heavy-duty build suit projects that expect moderate to high radial and moment loads.

It is less appropriate for ultra-high-speed pick-and-place systems where specialized miniature guides or recirculating ball designs are required, or for users who need a fully assembled carriage-rail subassembly; some mechanical skill is required to mount and align the rail and blocks correctly.

Pros & Cons

Pros

• Hardened high-carbon steel rail provides excellent wear resistance and stiffness.
• Four-point contact slider design delivers even load support and self-alignment.
• Carriage blocks with multiple steel balls run smoothly with low friction and good durability.
• Manufacturer offers custom lengths and splice solutions for long spans.

Cons

• Requires careful mounting and alignment; end users must handle installation and maintenance.

Specifications

Brand	Mssoomm
Model	HGH20
Rail length	67.72in / 1720mm
Included blocks	2pcs HGH20CA carriage slider blocks
Rail material	High-carbon steel, quenched and tempered
Lubrication	#46 grease recommended

Our Verdict

The HGH20 67.72in square linear guideway kit is a practical value for builders who need a long, stiff rail and reliable carriage blocks for CNC or DIY motion systems. Its hardened rail and four-point contact blocks deliver precise, durable linear motion, and the option for custom lengths makes it flexible for larger projects. Buy it if you can perform accurate mounting and want a robust, low-friction guide at a modest price.

Frequently Asked Questions

Can I get a different rail length?
Yes, the manufacturer offers custom lengths and can splice rails for total lengths beyond standard sizes.

What grease should I use?
#46 grease is recommended for routine maintenance to keep the sliders smooth and extend service life.

Are the blocks interchangeable with other square rails?
The kit is designed to be interchangeable with other square linear rail kits of the same profile, but confirm dimensions before mixing brands.