Square Linear Guideway Rail HGW20 13.39in Rail and 2 HGW20CA Blocks

In this review the focus is the Square Linear Guideway Rail HGW20 13.39in kit with two HGW20CA flange carriage blocks. It is aimed at hobbyists and small workshop CNC builders who need a compact, high-precision linear motion solution. The bottom line: this kit delivers stiff, low-friction linear travel in a short, ready-to-install length and is especially useful when reliability under load and ease of assembly matter most. The review highlights build quality, interchangeability, and practical maintenance needs for DIY projects.

Key Features

• HGW20 340mm rail: Provides a 13.39in hardened high-carbon steel rail that resists bending and keeps motion straight under load.
• Two HGW20CA flange blocks: Flange-type carriage blocks offer convenient mounting and even load distribution for compact setups.
• Four-point contact design: The Goethe-style contact geometry supports loads from up, down, left and right while providing self-alignment.
• Durable materials: Quenched and tempered rail and high-quality bearing steel balls give long-term wear resistance and smooth travel.
• Interchangeable sizing: The kit is compatible with other 20mm square linear rail series, making upgrades or replacements straightforward.
• Factory direct and customizable: The manufacturer offers custom lengths and splicing for longer rails when required.

Who It's For

The kit is best for CNC hobbyists, small machine builders, and DIY fabricators who need a sturdy 20mm linear guide for axes on routers, mills, or custom rigs. Its compact 340mm length suits small beds, gantries, or X/Y axes where a shorter precise travel is required.

Those needing pre-assembled long rails beyond 2950mm or who require specialized sealed carriages for dirty environments should consider alternate products or request custom lengths and options from the supplier. This kit is not a full motion system and will require compatible mounting hardware and lubrication to perform optimally.

Pros & Cons

Pros

• High-carbon steel rail with quenching and tempering gives strong bending resistance and long wear life.
• Flange HGW20CA blocks are sturdy, easy to mount, and distribute loads evenly for stable travel.
• Four-point contact and self-aligning design keep motion accurate even with minor mounting surface error.
• Direct factory availability and the option for custom lengths or splicing provides flexibility for nonstandard projects.

Cons

• The 340mm length is fixed in this kit, so longer axes require additional ordering or splicing arrangements.
• Blocks are not described with heavy sealing for high-dust or wet environments, so extra protection may be needed in those conditions.

Specifications

Brand	Mssoomm
Model	HGW20
Rail width	20mm
Rail length	340mm (13.39in)
Included carriages	2 x HGW20CA flange type carriage blocks
Material / treatment	High-carbon steel, quenched and tempered
Maintenance	#46 grease recommended

Our Verdict

This HGW20 340mm rail and HGW20CA carriage kit is a reliable, value-minded choice for hobby CNC builders and small machine shops needing precise, low-friction linear travel in a compact length. Its hardened rail, flange blocks, and four-point contact design deliver stability and interchangeability; users should plan for proper lubrication and consider custom lengths if their project exceeds the included span.

Frequently Asked Questions

Can this rail be extended for longer travel?
Yes. The manufacturer supports custom lengths and splicing technology for total lengths exceeding 2950mm; contact them to arrange a splice or longer piece.

What lubrication is required?
Regular maintenance with #46 grease is recommended to preserve smooth motion and extend service life.

Are these blocks compatible with other 20mm series?
Yes. The HGW20 kit is interchangeable with other square 20mm linear rail series such as HGH/HGR 20 types.