• Maintains high accuracy as a master for squareness measurement.
• We use Seisakusho Precision Steel Cylindrical Square for measurement of perpendicularity of parts attached using jigs, products squareness, etc
• The 1-line cylindrical surface in contact with the workpiece allows for accurate measurement.
  We harden all sizes.

*If requested, we can also manufacture a chrome plated type.
*300~600mm is handle. 800mm and above is eyebolt attached.

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Seisakusho Granite Dial Comparator

• Equipped with a micro motion mechanism which makes it easy for very minute dial gauge movement.
• The base is made of high-quality black plaque rock.
• Secular distortion and temperature variation are very small. Hardness is high with superior wear resistance characteristics.

*Dial Gauge is not included.

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• Perpendicularity of 2 surfaces is accurately finished.
• Suitable for machine tool assembly and inspection.
• Accuracy surface has lapping finishing

*We also manufacture similar products with special measurement.

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• n 4 surfaces, Squareness and perpendicularity is maintained with high accuracy.
• Designed to minimize secular distortion, and changes due to temperature.
• Seisakusho Cast Iron Master Angle can maintain long term accuracy and so is very suitable for as a perpendicular master.
• Accuracy surface has lapping finishing

*We also manufacture similar products with special measurement.

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• On 4 surfaces, Parallelism and perpendicularity is maintained with high accuracy.
• Secular distortion, and temperature change effects are minimal. It is wear resistant and does not rust in addition to other special features.
• Seisakusho Granite Master Angle can maintain long term accuracy and so is very suitable for as a perpendicular master.
• Very convenient for accuracy check in precision machinery etc.

*For 750mm and above there is not side surface thickness reduction.
*750mm and amove comes with screw hole for lift arm.
*According to your requirement, we also manufacture special measurement products.

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• 1. “We maintain the perpendicularity of two surfaces with high accuracy.”
  2. “It is designed to minimize secular distortion and temperature-related changes.”
  3. “Use the Seisakusho Cast Iron Square Plate as a standard parallel square.”
  4. “The precision surface receives a lapping finish.”

*According to your requirement, we can make products on which the accuracy surface is scrape finished.

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Manufacturer : Obishi Keiki Seisakusho

Stock No : 900-5

• We use black gabbro granite for the material.
  We apply lapping finishes to two surfaces, thereby ensuring high accuracy in perpendicularity.
  This type is specifically designed to maintain long-term perpendicular accuracy.

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• On the long side exterior angle side surface, there is 1 mm interval graduation (One surface only)
• Use for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc
• The short side is thick making it possible for stable measurement.
• Also very convenient for use as a marking square.
• The long side and short side are joined using a special method.

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• On the long side interior angle and the short side exterior angle side surfaces, there is 1 mm interval graduation (One surface only)
• We use Seisakusho Graduated Square for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc
• Also very convenient for use as a marking square.

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• We use black gabbro granite for the material.
• Maintains high accuracy as a master for squareness measurement.
• We use Seisakusho Granite Cylindrical Square for measurement of perpendicularity of parts attached using jigs, products squareness, etc
• Because the contact surface with work piece is a 1 line cylindrical surface, accurate Measurement can be performed.

*300mm and above is handle attached.

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• Accuracy is JIS Standard Grade 1
• Its thickness ensures stability even when used in a standing position.
  We harden all sizes.
  We manufacture special measurement products according to your requirements.

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• Its thickness ensures stable squareness measurement.
  The long side features a knife-shaped exterior angle with a slightly R-shaped knife tip.
  It easily permeates light rays, making it very easy to use.
  We design the precision surface specifically for the exterior angle, and we harden all sizes

• It upholds high accuracy as a high-grade square designated by the JIS standard.
  The exterior angle on the long side features a knife shape, and the knife tip has a slight R shape.
  It allows light rays to permeate easily, making it very user-friendly.
  All sizes undergo hardening.

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• It meets the JIS standard Grades 1 and 2 for accuracy.
  It upholds high accuracy as a JIS standard designated high-grade square.
  Its thick and balanced design allows for stable measurements while standing.
  Use it for measuring the perpendicularity of tools, squareness of parts attached using jigs, squareness of products, and more.
  It provides sufficient accuracy for use as a master in precision machinery and measuring instruments.
  We harden all sizes.
  We also manufacture products with special measurement and precision requirements.

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Parallel Square with Base

• Accuracy is JIS Standard Grade1, Hardened.
• Use for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc
• The short side is thick making it possible for stable measurement.
• The long side and short side are joined using a special method.

Grade 1 Hardened.

A Type Square with Base

• Accuracy is JIS Standard Grade2, Non Hardened.
• Use for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc
• The short side is thick making it possible for stable measurement.
• The long side and short side are joined using a special method.

Grade 2 Non Hardened.

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Flat Type Parallel Square

• Accuracy is JIS Standard Grade1, Hardened.
• Used for Parallel measurement.
• Use Seisakusho Flat-Type Square for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc

Grade 1 Hardened.

D-Type Flat Square

• Accuracy is JIS Standard Grade2, Non Hardened.
• Used for Parallel measurement.
• Use Seisakusho Flat-Type Square for measurement of tools perpendicularity, and squareness of parts attached using jigs, products squareness, etc

Grade 2 Non Hardened.

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• This product is a standard steel Straight Edge, with graduation lines of 1mm pitch.
• It is graduated from the right edge.
• It is used for marking off.

*Accuracy surface is 1 side only. Graduation side edge surface.

• This product is a standard steel Straight Edge , with graduation lines of 1mm pitch.
• It is graduated excluding 20mm on both edges. (Same as for Nominal Measurement)
• It is used for marking off.

*Accuracy surface is 1 side only. Graduation side edge surface.

• 3 sided with all sides straightness finished with high accuracy.
• The cutting edge tip is a very small R shape.
• Because the work is straight lined, accurate straightness and flat surface measurement can be performed.
• If a light ray is applied and inspection performed, all the more accurate measurement can be performed.
• Hardened

• High accuracy straight edge. The edge part is thin-bladed.
• The cutting edge tip is a very small R shape.
• Because the work is straight lined, accurate measurement of straightness and flatness is possible.
• If a light ray is applied and inspection performed, all the more accurate measurement can be performed.
• Hardened

• Best suited for use as scale for flatness, bending, etc inspection and marking.
• Accuracy surface is one side (the lower side of the label)
• There are hardened and non hardened types.

• Suitable for Flatness, Bending, etc inspection and as a level for marking.
• Precision surface is 1 surface on the knife tip side (lower side of the label)
• There are hardened and non hardened types.

• Standard Straight Edge made of good quality Cast Iron. Precision surface has scrape finishing
• Suitable for inspection of machine tool accuracy, surface inspection and lapping.
• For protection of the accuracy surface, a wooden cover is attached.

• Manufactured with good quality gabbro granite.
• Suitable for inspection of Precision machinery running accuracy, machined surface straightness and flatness
• The precision surface is graduated excluding 20mm form both edges. (Same for Nominal Measurement)

*Products with Nominal Measurement 1000mm have handle

• The Width is widened so that Levels etc can be placed on it for use.
• As a standard straight Edge it is suitable for measurement of Parallelism and straightness
• Use as standard or for inspection of machine running condition, Precision machinery assembly, fixing of turbines for generating plants, etc.
• Straightness and Parallelism (Not same as JIS height) clears the requirements for Straight Edge JIS Standard (JISB7514)
• There are hardened and non hardened types.

*According to the requirement, we can also manufacture special Grade products
*The box enclosure is a robust type used also for transportation

Grade A

Grade B

NOTE

Bezel Point

*Straightness Measurement

For our products, the minimun deflection point (bessel point) is specied by the Straight Edge, and Straightness Measurement is performed. The distance from both edges to the support position P :

P=0.2203×L　(L=Lenght Lenght mm)

• Rectangular Type that clears the requirement of Straight Edge for JIS Standard (JIS B7514)
• Suitable fir inspection of flat surfaces, straightness and Parallelism
• The precision surface is graduated excluding 20mm form both edges. (Same for Nominal Measurement).
• All sizes are hardened.

*According to the requirement, we can also manufacture special Grade product.

Manufacturer : Obishi Keiki Seisakusho

Stock No : 212-1

• I Type that clears the requirement of Straight Edge for JIS Standard (JIS B7514)
• Suitable fir inspection of flat surfaces, straightness and Parallelism
• The precision surface is graduated excluding 20mm form both edges. (Same for Nominal Measurement).
• In order to make products 1500mm and above more portable a handling hole is provided
• All sizes are hardened.

*According to the requirement, we can also manufacture special Grade products.

Features

• Use for inspection of machined surfaces and as standard guide.
• I type with minimal strain.
• The precision surface is graduated excluding 20mm form both edges. (Same for Nominal Measurement).
• In order to make products 1500mm and above more portable a handling hole is provided.

Specifications

Grade A

Grade B

Manufacturer : Obishi Keiki Seisakusho

Stock No : 810

• For measuring large rolls.
• It is lightweight because light alloy metal is used as the material. (However, the frame is made of Cast Iron)
• 4 pcs of job run roller have bearings in them and they are precision grinded.
• Movement on the roll is slow and smooth.
• A special interval graduation is inprinted on the arm. By matching a bracket onto the work measurement figures, it is possible to easily set a Dial Gauge on the roll center of the work.

*A 0.01mm graduation dial gauge is supplied with the product.
*The storage box is designed in such a way that the main body will have to be disassembled before putting it into the box.

• Measurement of Surface Plate Flatness, Straightness etc can be done easily.
• At 3 points of the fulcrum interval 100mm, flat surface unevenness is measured
• Before measurement, perform zero setting on the master surface plate.

*Dial Gauge is sold separately.

Main Equipment

Master Surface Plate

• On the granite standard straight edge lower surface, 3 saddle supports are attached.
• The accuracy surface is high precision and light weight.
• By moving the slider, straightness can easily be measured.
• By performing Zero setting on the master surface plate, it is possible to measure the work absolute value
• Rather than a dial gauge, by using a proble with external output, it is possible to perform data processing.

*Dial Gauge is sold separately.

Main Equipment

Master Surface Plate

• Auxiliary table for machining centers. (base)
• There are T groove shape and screw hole shaped products.
• We can design and manufacture to your required measurement.

Feature

This angle plate facilitates the installation of work pieces on machining centers. This angle plate guarantees precision with its scrape-finished base and upright surfaces, ensuring accuracy for optimal performance. Additionally, the upright surface features a T groove to securely fix work pieces.

• The base and upright surface accuracy is ensured.
• The base and upright surfaces are scrape-finished.
• On the base and upright surfaces, slotted holes are provided for the fixation of workpieces.
• It can be used as a machining jig if installed in machining centers.
• There is a support on the inner part for works longer than 200mm.

*We also manufacture similar products with special measurements.

Manufacturer : Obishi Keiki Seisakusho

• Use for marking, measurement, large type compass etc.
• The beam has 1mm interval graduation.
• The beam is hardened steel and so can also be used as a straight edge.
• Comes micro motion instrument for adjustment

Manufacturer : Obishi Keiki Seisakusho

Stock No : 902

• The beam is made of stainless steel pipe.
• Use for marking, measurement, large type compass etc.

*It has no graduation.

Manufacturer : Obishi Keiki Seisakusho

Stock No : 314

• Stable Sine Bar with high accuracy Center
• Please use a block gauge to set the Angle.
• Suitable for measurement of angular work pieces like taper, etc.
• Using the upper surface bed, it can also be used for angle measurement of flat objects
• Bed and roller are entirely hardened.
• The Center entry/exit uses spring method.

*Test bar is not supplied.

Manufacturer : Obishi Keiki Seisakusho

Stock No : 310

• Please use a block gauge to set the Angle.
• Suitable for measurement of angular work pieces like taper, etc.
• Using the upper surface bed, it can also be used for angle measurement of flat objects.
• The Center entry/exit uses spring method.

*Test bar is not included

Manufacturer : Obishi Keiki Seisakusho

Stock No : 315

• A high precision Sine Bar
• The upper surface has lapping finishing
• Please use a block gauge to set the Angle.

Manufacturer : Obishi Keiki Seisakusho

Stock No : 316

• Designed for stability.
• It is possible to detach the base and use the upper surface only.
• lapping finishing and entirely hardened
• Please use a block gauge to set the Angle.

Manufacturer : Obishi Keiki Seisakusho

Stock No : 305

• Double Type Sine Plate that ensures high precision
• The upper Table can be inclined 90 degrees and the center table 45 degrees
• Comes with main scale graduation (1 degrees) and vernier scale (5 percent)
• Block Gauge stand for high accuracy measurement
• T Groove for work piece locking. (4 places)
• The center table can be moved Up/Down using the handle. (To move upwards it has to be hand lifted)

(NOTE) Inclination Angle is determined by the supplied graduation plate

Manufacturer : Obishi Keiki Seisakusho

Stock No : 340

• Sine Plate that is ensured of high accuracy
• Inclination Angle can be from 0 to 90 degreed.
• Comes with main scale graduation (1 degrees) and vernier scale (5 percent)
• Block Gauge Stand for high accuracy measurement is equipped.
• Parallelism of the upper surface and base surface is ensured.
• T Groove for work piece locking. (3 places)
• Angle movement is sideburns type using the handle.

*The handle for angle movement is supplied.