ZHHIMG® Ultra-Precision Granite Tri-Square Ruler (90° Master Triangular Square)
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When your assembly line or inspection laboratory demands flawless 90° alignment, structural compromise is out of the question. Mechanical deviations of even a single micrometer can compromise whole batches of semiconductor chips, disrupt coordinate measuring machine (CMM) calibration, or misalign automated optical inspection (AOI) gantries.
The ZHHIMG® Precision Granite Tri-Square Ruler acts as the definitive metrological benchmark for squaring, squaring-calibration, and axis alignment. As seen in Ultra-Precision Straightedge.jpg, this component is meticulously extracted from our certified, proprietary black granite reserves. It features a distinctive triangular profile with an integrated weight-reduction and handling bore through its center, making manual placement during machine tool leveling both stable and smooth.
Unlike budget-grade commercial marble alternatives that warp, warp under ambient thermal shifts, or scratch easily, our igneous-class black granite provides an unchanging physical reference point. With an exceptional material density of ≈ 3100 kg/m³, this master triangular square delivers natural vibration attenuation and immense dimensional permanence.
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Model |
Details |
Model |
Details |
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Size |
Custom |
Application |
CNC, Laser, CMM... |
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Condition |
New |
After-sales Service |
Online supports, Onsite supports |
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Origin |
Jinan City |
Material |
Black Granite |
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Color |
Black / Grade 1 |
Brand |
ZHHIMG |
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Precision |
0.001mm |
Weight |
≈3.05g/cm3 |
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Standard |
DIN/ GB/ JIS... |
Warranty |
1year |
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Packing |
Export Plywood CASE |
After Warranty Service |
Video technical support, Online support, Spare parts, Field mai |
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Payment |
T/T, L/C... |
Certificates |
Inspection Reports/ Quality Certificate |
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Keyword |
Granite Machine Base; Granite Mechanical Components; Granite Machine Parts; Precision Granite |
Certification |
CE, GS, ISO, SGS, TUV... |
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Delivery |
EXW; FOB; CIF; CFR; DDU; CPT... |
Drawings’ format |
CAD; STEP; PDF... |
• ≈ 3100 kg/m³ High-Density Igneous Matrix: We strictly reject cheaper marble or lower-grade granite. Our selected black granite provides near-zero internal stress and a minimal coefficient of thermal expansion, ensuring your calibration values do not drift when the facility's ambient climate shifts.
• Artisan Hand-Lapping to Nanometer-Limits: While massive 6000 mm grinding machines establish our basic shapes, our veteran technicians—possessing over 30 years of manual experience—refine each working edge. Their tactile sensitivity enables hand-rubbed precision to fractional-micrometer levels, functioning as an organic electronic level.
• The Industry’s Only Quadruple-Certified Line: ZHHIMG® is the exclusive global manufacturer simultaneously verified under ISO 9001, ISO 45001, ISO 14001, and CE compliance frameworks. Your quality assurance audit teams can source with total peace of mind.
• Unbroken Calibration Traceability: Every master square undergoes comprehensive inspection utilizing Swiss WYLER electronic levels (0.5μm/m) and Renishaw laser interferometers. All instruments hold official certificates traceable to the National Institute of Metrology.
We use various techniques during this process:
● Optical measurements with autocollimators
● Laser interferometers and laser trackers
● Electronic inclination levels (precision spirit levels)
1. Documents together with products: Inspection reports + Calibration reports(measuring devices) + Quality Certificate + Invoice + Packing List + Contract + Bill of Lading(or AWB).
2. Special Export Plywood Case: Export fumigation-free wooden box.
3. Delivery:
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Ship |
Qingdao port |
Shenzhen port |
TianJin port |
Shanghai port |
... |
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Train |
XiAn Station |
Zhengzhou Station |
Qingdao |
... |
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Air |
Qingdao Airport |
Beijing Airport |
Shanghai Airport |
Guangzhou |
... |
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Express |
DHL |
TNT |
Fedex |
UPS |
... |
Q1: Why is high-density black granite superior to iron or marble for squareness calibration?
Cast iron rusts, experiences dimensional distortion from ambient magnetic fields, and rings under harmonic vibration. Marble is a softer metamorphic rock prone to structural micro-cracking, scratch damage, and environmental degradation. ZHHIMG® black granite (≈ 3100 kg/m³) is chemically inert, non-magnetic, highly dampening, and structurally stable.
Q2: What global metrology standard codes do your squares conform to?
Our production and inspection stages strictly mirror global requirements, notably German DIN 876/DIN 875, American ASME / Federal Specification GGG-P-463c-78, and Japanese JIS industrial standard loops.
Q3: How should the granite tri-square be maintained to retain its micron accuracy?
Always wipe the working reference surfaces with cleanroom-grade industrial alcohol prior to contact. Store the square in its provided shock-absorbing wooden protective crate in a temperature-stabilized setting (20℃ ± 0.5℃) to limit thermal gradients.
QUALITY CONTROL
If you can’t measure something, you can’t understand it!
If you can’t understand it.you cant control it!
If you can’t control it, you can’t improve it!
More information please click here: ZHONGHUI QC
ZhongHui IM, your partner of metrology, help you succeed easily.
Our Certificates & Patents:
ISO 9001, ISO45001, ISO14001, CE, AAA Integrity Certificate， AAA-level enterprise credit certificate…
Certificates and Patents are an expression of a company’s strength. It’s society’s recognition of the company.
More certificates please click here: Innovation & Technologies – ZHONGHUI INTELLIGENT MANUFACTURING (JINAN) GROUP CO., LTD (zhhimg.com)
