UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite square vs steel square in China. With abundant experience, we warmly welcome you to buy advanced granite square vs steel square made in China here from our factory. We also accept custom orders.
When a machine's axes are even slightly out of square, the error shows up in every part it produces. A granite square ruler gives you a stable 90° reference to catch that error before it reaches the customer. Our precision granite square rulers are made from UNPARALLELED® black granite, with a density of about 3,100 kg/m³. They are lapped by hand-finishing technicians with decades of experience, so the reference faces stay flat, square and dependable in a workshop or calibration lab.
Why granite, and why this one
Steel squares respond to temperature, handling and magnetism. Granite does not rust, does not hold a burr, and is far less affected by small temperature swings. If it is knocked, it chips locally instead of bending, so a lightly damaged edge does not distort the whole reference. For assembly and calibration work, that predictability is what you are really buying.
Key features
- Black granite body: dense, fine-grained and dimensionally stable. Not marble.
- Hand-lapped reference faces: finished by experienced technicians and checked against calibrated instruments.
- Traceable inspection: measuring equipment is calibrated by municipal and provincial metrology institutes, traceable to the national metrology institute.
- Non-magnetic and rust-free: no corrosion, no oiling, no magnetic chips.
- Made to your drawing: sizes, tolerance grade and configuration can be customised.
- Safe transport: a foam-lined aluminium flight case is available as optional packaging (confirm before publishing).
quality control
Specifications
| Item | Details |
|---|---|
| Material | UNPARALLELED® black granite |
| Density | approx. 3,100 kg/m³ |
| Standard | DIN 875 / GB / [other standards as required] |
| Accuracy grade | [Grade 00 / 0 / 1, per your inspection report] |
| Squareness tolerance | [fill from inspection standard, by size] |
| Flatness of working faces | [fill from inspection standard, by size] |
| Available sizes | [e.g. 200 × 130 mm to 1000 × 630 mm, confirm range] |
| Surface finish | Hand-lapped |
| Certificate | Calibration report available |
| Packaging | Foam-protected case or export wooden box |
| Customisation | Size, grade, hole/slot options, logo |
Where it is used
- Machine assembly: checking the squareness between X, Y and Z axes on CNC machines, CMMs and linear-motor stages.
- Calibration labs: verifying squareness of other instruments and tooling.
- Semiconductor and electronics equipment lines: aligning precision modules during installation.
- Quality control rooms: quick, repeatable squareness checks on machined parts.
Your benefit is simple: fewer rework cycles, faster alignment, and measurement results you can defend in an audit.
services
FAQ
What is a granite square ruler used for?
It provides a precise 90° reference for checking squareness between surfaces or machine axes, and for calibrating other measuring tools.
Granite square or steel square, which should I choose?
Choose granite when you need long-term stability, no corrosion and no magnetism. A steel square can suit rougher shop-floor use, but it is more sensitive to temperature and wear.
How often should a granite square be calibrated?
It depends on usage and your quality system. Many labs re-check yearly, or sooner after impact. Send us your usage conditions and we will suggest an interval.
Can you make a custom size or grade?
Yes. Send a drawing or tell us the dimensions and required accuracy, and we will confirm feasibility and lead time.
Do you provide a calibration certificate?
Yes. Inspection is done with calibrated equipment traceable to national standards. Tell us if you need a specific report format.
Is this real granite or a cheaper stone?
It is black granite, and we can provide material information on request.
certificates
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