ZHHIMG® High-Precision Granite Straight Ruler: The Definitive Calibration Standard for Metrology Labs
Based on the metrology design profile, the ZHHIMG® Granite Straight Ruler features a robust, elongated rectangular block configuration.
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• Material Texture: The surface showcases a deep, fine-grained, pitch-black mineral structure with subtle natural white crystalline inclusions, indicative of authentic high-density black granite. The finish is a specialized matte-lapped texture that prevents optical glare and minimizes friction during slide testing.
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• Weight-Reduction Through-Holes: A defining design feature is the row of uniform, precision-bored circular through-holes aligned along the centerline of the ruler. These holes drastically reduce the structural weight of the stone—making manual field handling practical—without sacrificing longitudinal rigidity or geometric cross-sectional strength.
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• Authenticity Plate: The front face features a centered gold brass nameplate detailing its metrology origin, classification ("Flat Rule"), and calibrated precision grade, providing a visible mark of engineering trust.
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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... |
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• Immunity to Micro-Deformation: Unlike steel rulers that warp under internal stress, our granite straight edges undergo an interlocking igneous crystallization process deep within the earth. This natural aging process ensures virtually zero internal residual stress, preventing dimensional warping over years of usage.
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• Exceptional Density and Hardness: Achieving a density of approximately 3100 kg/m³, ZHHIMG® granite possesses an ultra-dense structure that outperforms traditional European and US alternatives. It resists deep scratches and accidental shop-floor indentations, protecting the tool's geometric form.
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• Thermal and Chemical Inertness: Industrial shops face constant fluctuations in temperature and exposure to aggressive coolants. ZHHIMG® granite maintains an incredibly low coefficient of thermal expansion and is completely acid and alkali resistant, ensuring reliable accuracy under harsh assembly conditions.
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• Nanometer Hand-Lapping Mastery: While automated grinding machines handle the initial form, our master technicians—with over 30 years of manual lapping experience—hand-lap each reference surface. This manual calibration removes mechanical wave patterns, yielding an isotropic surface that guarantees excellent air-bearing glide paths and straightness alignment.
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 should I choose a granite straight ruler instead of a magnesium-aluminum or steel straight edge?
Metal tools are highly susceptible to thermal expansion and atmospheric corrosion. A technician handling a metal ruler can transfer body heat into the tool, causing it to flex microscopically. Granite has an exceptionally low coefficient of thermal expansion and cannot rust, ensuring absolute measurement stability.
Q2: How do you verify the accuracy of the straightness and flatness?
Every single ZHHIMG® tool is evaluated using Swiss WYLER electronic levels and British Renishaw laser干涉仪 (laser interferometers). Our verification processes strictly adhere to global standards like German DIN 876 and US GGGP-463C-78. All calibration equipment is certified by official Metrology Institutes, offering full national traceability.
Q3: Do the weight-reduction holes affect the precision of the ruler?
Not at all. The size, depth, and placement of the circular cutouts are structurally engineered to balance the physical mass distribution. They reduce the burden of manual handling while maintaining the rigid structural modulus required to prevent sagging or deflection along the longitudinal plane.
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)
