UNPARALLELED LTD is one of the leading manufacturers and suppliers of granite right angle square in China. With abundant experience, we warmly welcome you to buy advanced granite right angle square made in China here from our factory. We also accept custom orders.
Product Detail
Precision Granite Square for Perpendicularity Inspection
A dependable reference makes precision work easier to judge.
The UNPARALLELED® precision granite square provides a physical reference for perpendicularity inspection, machine alignment, and precision assembly. Our granite square rulers are manufactured from black granite, with four precision measuring surfaces specified to suit the selected size and accuracy requirements.
Whether you are checking a machine structure or preparing an inspection setup, the starting point is the same: define the measuring faces, the working length, and the allowable geometric error. We help you specify those requirements before the product is made.
Built Around the Measurement You Need
A granite square should be selected for its documented geometry-not simply its appearance.
UNPARALLELED® offers granite square rulers for CNC, laser, CMM, semiconductor, and metrology applications. Products are inspected in a temperature- and humidity-controlled environment, with the existing product specification identifying a reference inspection temperature of 20°C.
The illustrated design features a substantial square-format body and four circular openings. The final drawing defines the dimensions, hole details, designated measuring faces, and acceptance requirements.
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Technical Specifications
| Parameter | Specification or selection requirement |
|---|---|
| Brand | UNPARALLELED® |
| Product type | Precision granite square / granite square ruler |
| Material | Black granite |
| Illustrated configuration | Square-format body with four circular openings |
| Measuring surfaces | Four precision surfaces specified in the existing product range |
| Published nominal face sizes | 150 × 150, 160 × 160, 200 × 200, 250 × 250, 315 × 315, 400 × 400, and 500 × 500 mm |
| Thickness | Confirm against the selected model or approved drawing |
| Accuracy grades listed in the existing range | Grade 00 and Grade 0; applicable standard and acceptance limits to be confirmed |
| Squareness tolerance | Confirm for the selected size, grade, and measuring faces |
| Straightness tolerance | Confirm for the specified measuring length |
| Parallelism tolerance | Confirm where required by the selected configuration |
| Inspection environment | Temperature- and humidity-controlled; published inspection temperature: 20°C |
| Documentation | Test report, including error information and installation instructions, as specified in the existing product offering |
| Customization | Dimensions and additional features subject to drawing review |
| Packaging | Custom export packaging |
Published range information comes from the existing UNPARALLELED granite square ruler page. The photograph does not identify a particular size or accuracy grade. Final contractual specifications should follow the approved drawing and quotation.
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Key Features and Buyer Benefits
A Defined Reference for Geometric Inspection
Use the square as a reference in perpendicularity inspection and precision alignment work. Select the required geometric tolerances for the actual measuring length rather than relying on a single, unqualified "accuracy" figure.
Precision-Finished Measuring Surfaces
UNPARALLELED describes hand lapping as part of its precision component manufacturing process. For your order, identify the working faces and required geometry so that manufacturing and inspection address the surfaces that matter to your application.
Black Granite Construction
The product is manufactured from black granite. The dark, naturally textured material gives the square its characteristic appearance, while material selection and finished geometry remain separate items to verify in the specification.
Inspection Documentation You Can Review
The existing product offering includes a test report with error information and installation instructions. Confirm the required report content before ordering, particularly when your incoming inspection procedure requires a named standard, specific measuring faces, or a defined acceptance method.
Options for Application-Specific Requirements
Need a different size or a modified configuration? UNPARALLELED accepts custom orders. Send a drawing so the team can review the proposed dimensions, openings, interfaces, and inspection requirements.
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FAQ
What is a precision granite square used for?
A precision granite square is used as a geometric reference for perpendicularity inspection, alignment, and precision assembly. UNPARALLELED offers granite square rulers for machine-building, CMM, laser, semiconductor, and laboratory applications.
Is the pictured product a granite surface plate?
This listing is for a granite square ruler, as identified by UNPARALLELED. Although it is photographed lying flat, the product specification must identify its designated measuring faces and geometric requirements. It should not be selected as a general-purpose surface plate solely because it has a broad face.
What accuracy can you supply?
Accuracy depends on the selected size, grade, and geometric characteristic. The existing product range lists separate values for squareness, straightness, and parallelism across different sizes and grades. Request the specification for your selected configuration rather than treating one value as applicable to every model.
Can you make a custom size?
Yes. UNPARALLELED accepts custom orders for granite measuring products. Send your drawing and required tolerances for review; the approved quotation should identify the final configuration.
What are the four openings used for?
The photograph shows four circular openings but does not establish their function. Please confirm the hole configuration and intended purpose on the product drawing. Do not use the openings for lifting or clamping unless that use has been expressly approved.
Will an inspection report be supplied?
The existing UNPARALLELED product page states that granite measuring tools are supplied with a test report, including error information and installation instructions. Specify any additional documentation requirements when requesting a quotation.
Which standard will apply to my order?
The applicable standard, edition, grade, and acceptance criteria should be agreed before manufacture. Your purchase specification should identify the requirements relevant to this product rather than listing several standards without explaining their scope.
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