HIWIN EGH15CA Linear Guideway Block: Complete Technical Guide for CNC and Automation Applications

January 13, 2026

Pre-shipment Inspection Record: This document details the visual and technical inspection of the HIWIN EGH15CA Linear Guideway Block: Complete Technical Guide for CNC and Automation Applications. All product photos and testing videos below are original materials captured first-hand by the Koeed technical team in our warehouse prior to dispatch.

What is the HIWIN EGH15CA linear guideway block?

The EGH15CA is HIWIN's heavy-load flange-style ball guideway block for the 15 mm EG rail series — the carriage that carries the load in CNC routers, gantries and automation slides. This record is a lot of twelve blocks, each sealed two-per-bag, stored factory-new on 26 December 2025. The top face carries the identity in HIWIN's laser marking — HIWIN over EGH15 with lot code C45MT231 — and every block carries the same pairing marks on its side: 486 2-5 10328G on one edge and 2 AI 0509 on the other. All eleven photos and the inspection video below show these exact twelve.

3 min readContent reviewed 8 October 2026

Part details

EGH15CA, as read from the laser marking and the sealed bags
Field	Value
Brand	HIWIN (top-face laser marking)
Model	EGH15CA — EG series heavy-load block, 15 mm rail class
Marking	HIWIN / EGH15, lot code C45MT231
Pairing marks	486 2-5 10328G and 2 AI 0509 on every block
Size class	EG15 rail: block width 34 mm, assembled height 24 mm (catalogue series dimensions)
Sealing	Red end seals plus green secondary seals, black scraper strip
Factory protection	Rust-inhibiting steel-band stickers over the ball ways
Quantity	12 blocks, two per bag, six bags total, about 0.5 kg per block as recorded at intake
Condition	Factory-new, sealed, recorded 26 December 2025

Scroll sideways to see the full table.

Values are read from the top-face laser marking, the side pairing marks and the photographed construction in the photo set.

How the EGH15CA decodes

The HIWIN part number breaks down in the order the name implies. EG is the heavy-load ball guideway family — the "E" grade carries higher load ratings than the standard HG in the same 15 mm footprint. H denotes the wider, higher-capacity block body; 15 is the rail width class; and the CA suffix is HIWIN's light-preload, high-accuracy designation. What that buys on the machine side is four-way equal load rating — the gothic-arch ball groove geometry takes loads up, down and from both sides with the same rating — which is why the EGH15CA shows up in router gantries and multi-axis slides where the block sees overturning moments, not just vertical load. The red end seals are the primary lip seals; the green strips behind them are the secondary seals, and the black scraper at the face keeps chips out of the ball return — the sealing stack that decides whether a guide survives a dusty workshop.

Every block in this lot carries its pairing marks, and they match: 486 2-5 10328G and 2 AI 0509 laser-etched on the side of each carriage. Pairing marks matter more than buyers expect — blocks are lapped and gauged in matched sets at the factory, and mixing blocks between rails of the same size but different production lots can shift the running preload. A lot that arrives with matching pairing numbers, like this one, drops onto a rail and runs to spec. The factory's steel-band stickers still cover the ball ways under the packaging, and the six bags sit in the original closed-cell foam tray.

Photos

All images below are original KOEED warehouse photos. Click any photo to view it full size.

Twelve blocks in six sealed bags — The full lot from above: twelve blocks sealed two-per-bag in six bags, laid in the original foam tray with the factory accessory pouch at top.

Single block top face — One block, bag open for inspection: the HIWIN laser marking on the top face, the mounting holes, and the green end caps with red seals.

Blocks lying sealed on foam — Bags as they arrived — the steel-band rust-protection stickers still in place over the ball ways, the pairing marks visible through the film.

Side pairing mark close-up — Side face close-up: the laser-etched pairing mark 486 2-5 10328G, the black scraper strip and the red seal line.

End face with red seals — The end face: red primary end seal over the ball return, green secondary cap, and the top mounting holes — the sealing stack that keeps chips out.

HIWIN EGH15 laser marking — Identity shot: HIWIN / EGH15 with lot code C45MT231 laser-marked on the top face — the marking that confirms the part number.

Twelve blocks lined up — The twelve blocks face-up in their bags: every top face carries the same HIWIN / EGH15 marking and the steel protection bands.

Underside pairing marks — Undersides up: both pairing marks — 2 AI 0509 and 486 2-5 10328G — etched on every block, the red seal lines and the ground raceways behind the film.

Paired bags standing — A paired bag standing on edge: the raceway face and scraper strip, the factory film still sealed around both blocks.

Open bag inspection — Bag open at the factory seal: the 0509 mark on the side, the ball return circuit and the red seal line up close.

Undersides with scraper detail — Undersides again at a wider view: the matching pairing marks across the lot, and the black scraper strips along the raceway edges.

Inspection video, recorded at the Koeed warehouse before dispatch.

For a wider block from the same brand, see the HIWIN HGH25CA linear guide slider — the 25 mm flange block one size up — and the HIWIN HGW25CC block for the wider-shoe variant on the same rail series.