HGH20CA Linear Guide Block — 20 mm Square Type, Interchangeable
The HGH20CA is the 20 mm square heavy-load block of the HG series, the most common size in machining centres and general automation. Mounting hole spacing follows the HG standard, so an existing HG block can be replaced without re-machining the carriage. Interchangeable blocks are supplied in C/H/P accuracy and Z0/ZA preload.
Specifications
| Model | HGH20CA |
| Size | 20 mm |
| Block type | Square, heavy load (C) |
| Mounting | Top tapped (A) |
| Accuracy grade | C / H / P (interchangeable) |
| Preload | Z0 / ZA (interchangeable) |
| Matching rail | HGR20 |
| Dynamic load C (kN) | 17.75 |
| Static load C0 (kN) | 37.84 |
| Block height H (mm) | 30 |
| Block width W (mm) | 44 |
| Block length L (mm) | 77.5 |
Complete dimension table (mm) — HGH20CA
| H | 30 |
| H1 | 4.6 |
| N | 12 |
| W | 44 |
| B | 32 |
| B1 | 6 |
| C block length | 36 |
| L1 | 50.5 |
| L | 77.5 |
| K1 | 12.25 |
| G | 12 |
| M | M5x6 |
| H2 | 6 |
| H3 | 7 |
| Wr | 20 |
| Hr | 17.5 |
| D | 9.5 |
| h | 8.5 |
| d | 6 |
| P | 60 |
| E | 20 |
| Rail bolt | M5x16 |
| Dynamic C | 17.75 kN |
| Static C0 | 37.84 kN |
| MR | 0.38 kN-m |
| MP | 0.27 kN-m |
| MY | 0.27 kN-m |
| Block weight | 0.30 kg |
| Rail weight | 2.21 kg/m |
Transcribed from the current product catalogue. 2D drawing and STEP model on request.
Options
- Dust protection: ZZ / KK / DD
- Grease nipple or oil port
- Special machining on request
Where this block is used
The square block carries load in all four directions and bolts down onto a machined face, so it suits the X, Y and Z axes of machining centres, grinders and gantry frames where the carriage is bolted from above. At this size the block is normally paired with one rail per axis; two rails are used when the table is wide enough that a single rail would let the carriage rock.
Mounting: rails and blocks are bolted to machined faces. Rail bolts are tightened from the centre outwards in the sequence given in the catalogue, and running accuracy is checked with a dial gauge before the carriage is loaded. Lubrication is by grease nipple or oil port; the re-greasing interval follows load and duty cycle, so it is agreed with the customer rather than fixed on the datasheet.
Matching rail
HGR20 rail is cut to order from 100 mm. See rail options.
Downloads
STEP (AP214) model and 2D drawing for this size are available on request — ask us and we will email them.
FAQ
| Is HGH20CA interchangeable with other HG-standard blocks? | Yes. Mounting hole spacing and rail profile follow the HG standard, so an existing drawing carries over without modification. |
| Can I buy the block and the rail separately? | Yes, up to accuracy P and preload ZA. SP/UP accuracy and ZB preload are supplied as a matched set only. |
| What is the difference between C and H load type? | C is the standard heavy-load block; H is the higher-load variant with a longer body. Both run on the same HGR20 rail. |