KOREA FIRST GAGE
ISO 9001:2000
CERTIFIED

ISO/IEC 17025:2006
KOREA LABORATORY
ACCREDITATION SCHEME

http://www.koga.co.kr

Japanese Industrial
Standards (JIS BO251)

American Petroleum
Institute

KOREA TESTING LABORATORY
Precise technical 1st class factoryWe Make Precision Gage,
KOREA FIRST GAGE
Our Company started the gage manufacturing business which is ultra-high precision technologyintensive industry with cooperation with ISSOKU (DAI-ICHI SOKUHAN WORKS LTD.) which is a Japanesegage specialty company with JIS 1-class approval on October, 1978. Our Company is adopting rational
management methods with pride and mission as a gage specialty company, and is supplying high quality
products to the industry on time and is exporting it’s products USA, Japan, China, Czech, Slovakia,Rumania and India, etc.
Our Company was designated as a national calibration & test institute (Ministry of Industrial Promotion,Notice No. 8-356) uniquely among small and medium size companies in the 1980’s when a national
standard system was under an initial establishing stage, and it is contributing to the national certified
standard system by acquiring ISO / IEC 17025 national certified calibration certification in 2001.

The products (gages and test instruments) of our Company is giving priority to precision and accuracy
and they are used as test and measurement system in the industry. By establishing a system unifying
gages and test instruments of our Company together with SPC system which is being introduced toproduction and process control of the industry, our Company want to be a critical helper to your company
in terms of production and quality controls with more rational and convenient manner.
Our Company has been growing continuously with your interest and support, and it will be our company
satisfying the needs of customers with sincerity hereafter too.

ISO 9001 CERTIFICATEH i s t o r y
ISO / I EC 17025:2006
CERTIFICATE OF ACCREDITATION

Oct. 1978		Jun. 1979
Apr. 1980		
Aug.		
Feb. 1984
Apr.		
Dec. 1990
Jul. 1992		
Sep. 1993
Dec. 1994
Mar. 1995
Dec.		
Feb. 1996
Nov.
Sep. 1997		
Sep. 1998
May. 1999
Dec. 2000
Aug. 2001
Dec. 2003
Nov. 2005
Jun. 2008
Sep.
Nov.				Mar. 2009						Foreigner’s investment approval for manufacturing business in cluding various industrial gages,
high accuracy machine parts and fixture, etc (Ministry of Economy Planning, No. 322-1966)
Foundation of KOGA Co., Ltd.
Designated as a small and medium size company-type specialty machine factory(Ministry of Commerce and Indust ry, No. 434)
Designated as a national calibration & test institute (Ministry of industrial Promotion, No. 13)
Selected as one of the promising small and medium size companies (Korea Development Investment, No. 9105821)
Designated as a product quality supervision company by Ministry of Industrial Promotion
Selected as a small and medium size company with advanced technology (Ministry of Commerce and Industry, No. 90024)
Received the top award from 22th precision competition (Ministry of Commerce and Industry),
Designated as the 1st class factory for precision technology (Ministry of Commerce and Industry)
Received the President’s award from 23th precision competition
Received the 1st award from 24th precision competition
Selected as one of 100 promising mall and medium size companies (Kyeonggi-do)
Received the 1st award form 25th Precision Competition.
Acquired quality certification mark (E.M) for machinery parts & materials
Received the 3rd award form 26th Precision Competition
Received an enterprise award for locally developed quality certified products(Minister of Small and Medium Business Administration)
Acquired ISO 9001:1994 certification
Acquired K mark certification for air/electric micrometer and thread gage
Designated as a FAMILY company of industrial Bank of Korea
Acquired authorized calibration institute license (ISO/IEC 17025, certilicalion/Certilicalion No. KC01-049)
Acquired transference to ISO 9001:2000 certification
Won the Minister of Commerce, Industry, and Energy’s Award at the 35th Precision Technology Promotion Competition
Obtained API (American Petroleum Institute) Q1 and Spec 5B Certification (No. 5B-0027)
Selected as Innovative Technology Business (INNO-BIZ) (No. 8061-2485)
Won the Industrial Award at the 38th Precision Technology Promotion Competition
Won the KASTO Award at the 38th Precision Technology Promotion Competition
Authorized JIS B0251 Limit gauges for metric screw threads (Certification No. KSKR08141)
Authorized JIS B0253 Gauges for taper pipe threads (Certification No. KSKR08142)
Authorized JIS B0254 Screw thread limit gauges for parallel pipe threads (Certification No. KSKR08143)
Authorized JIS B0255 Limit gauges for unified screw threads (Certification No. KSKR08144)

API CERTIFICATE

JIS B 0251 JIS MARK CERTIFICATECERTIFICATE OF INNO-BIZ

DESIGNATED AS THE 1ST CLASSFACTORY FOR PRECISIONTHCHNOLOGYP r o d u c t sGAGE- API SCREW GAGE
- JIG & FIXTURE- THREAD GAGES- TAPER THREAD GAGES- TEST BAR- SPECIAL GAGES- LIMIT PLAIN GAGES(PLUG, RING, SNAP GAGE)- TAPER GAGES- SINE BAR- ETCJIG & FIXTURE TESTER- MCT JIG / COMPOSITION MACHINE /LEAK TESTERMEASURING INSTRUMENT- AIR MICROMETER / ELECTRONIC 		MICROMETER- MEASURING HEAD AND MASTER FOR
AIR MICROMETER- MEASURING HEAD AND MASTER FOR
ELECTRONIC MICROMETER- SPC SYSTEM- O.B.D / I.B.D COMPARATOR- AUTOMATIC MEASURING MACHINE- CONCENTRICITY MEASURING INSTRUMENT- ECCENTRICITY MEASURING INSTRUMENT- LENGTH COMPARATIVE MEASURING
INSTRUMEN- SINE CENTER

4 • KOREA FIRST GAGEKOREA FIRST GAGE • 5Technology for Realization of Idea

Research &Development

Based on accumulated gage manufacturing technologies, the R&D segment is always doing their best
efforts to meet the needs of customers for customers production without intensive effort and advanced
production process with electronic digital air / electronic micrometer, automatic measuring system, andSPC(Statistical Process Control) System.

TECHNOLOGY

The technology segment is pursuing its role of technology department for customers with high quality
and high efficiency by designing appropriate gage for the needs of customers from GAGE(limit gage)to automatic measuring machine by succeeding and developing the traditional gage manufacturingtechnologies.

6 • KOREA FIRST GAGEKOREA FIRST GAGE

http://www.koga.co.kr

QUALITY &ASSURANCE

The gages are authentic tools for efficient product inspection and quality assurance. The quality assurance
segment is retaining measurement and test equipments and technology for high quality and high accuracy
gage manufacturing. (ISO/IEC 17025 : 2006)(·Temperature 20±1°c ·Humidity 50~60% ·Dust : bigger than 0.5㎛, below 2x106 EA/m3 )PROCESSThe Company is fulfilling consistent and rational management from order to design, manufacturing, qualitycontrol, warehousing and delivery by using ERP(Enterprise Resource Planning) system uniquely developed
for the Company. The process segment is pursuing the company for customers to be able to cope with theneeds of customers with flexible procuction system for the items of various products and small production
such as jig & fixture and other gages.

KOREA FIRST GAGE • 7http://www.koga.co.kr

Prompt Response to The Needs of Customers

Jig &FixtureGage

These checking fixfure gages are a multifarious gages that, depending on the hole, shaft,depth, shape and so forth of measured object, several dimensions of various products are
simultaneously checked to determine whether it good or no-good. Any kinds of gages can besupplied for the inspection of works at every manufacturing process, if the work drawings areavailable.

SLEEVE GEARCHECK GAGECYLINDER HEADCHECK GAGECYLINDER BLOCKCHECK GAGECRANK SHAFTINSPECTION GAGE

HOLE POSITION GAGE
8 • KOREA FIRST GAGE

RUN-OUT CHECK GAGEBRAKE CYL. INNER DIA.
CHECK GAGE

Precision Product and Technology

API SCREWGAGE

Our screw gauge(for Casing, Tubing & Line pipe) is manufactured according to API(AmericanPetroleum Institute) SPEC 58 Standards and excellent in quality, thanks to the know-how ofprocessing and heat treatment through experience of many years in manufacturing screw
gauges meeting standard requirements of every country in the world.

API SPEC 5B CERTIFICATE

3 1/2 - 10 TBG

2 - 11 1/2 LP

2 7/8 - 8 UP TBG

7 - 8 CSG

KOREA FIRST GAGE • 9Precision Product and TechnologyTHREAD
GAGE

We design, manufacture screw gages with any standards(ISO, ANSI, JIS, DIN, BS) other than KS
Standard Limit Screw Gage to meet customer needs and international standards. We design,
manufacture according to order specifications based on our tradition and experience on screw
gage with special screw and functions such as ACME screw, angle screw, precision feed screw,and screw gage for measuring concentricity (axle).
JIS MARK CERTIFICATE AUTHENTICATION AGENCY : KSA- JIS B 0251 Limit gauges for metric screw threads (Certification No. KSKR08141)- JIS B 0253 Gauges for taper pipe threads (Certification No. KSKR08142)- JIS B 0254 Screw thread limit gauges for parallel pipe threads (Certification No. KSKR08143)- JIS B 0255 Limit gauges for unified screw threads (Certification No. KSKR08144)

10 • KOREA FIRST GAGEKOREA FIRST GAGE

http://www.koga.co.kr

SPECIALGAGE

As a customized gage for specialty use, the representative gages being used as assistantproduction fixtures or measurement tools are as follows:- TEMPLATE- THREAD CONCENTRICITY GAGE
- SPHERICAL GAGE
- BALL CONTACT GAGE
- CONTACT GAGE
- SINE BAR- LEAD SCREW- V-BLOCKTAPER GAGE& TEST BARTAPER GAGE
Taper Gage is used for testing taper on taper product and basic diameter of taper. NormallyTaper Plug Gage and Taper Ring Gage is combined as one set. Generally, the types of tapers areMorse Taper(MT), National Taper(NT), Jacobs Taper(JT),Brown Sharp Taper(BS).
TEST BAR- Straightness of shaft of various machineries- Movement of shaft and taper hole
- Parallelism between shaft and sliding surface- Assisting tool measuring at right angle- Jig for processing outside diameter of hollow shaft

KOREA FIRST GAGE • 11

Prompt Response to The Needs of Customers

MEASURING
INSTRUMENT

There is a possibility of getting the data where the regulation and use are stabilized easily
measurement room or uses in production site.

LENGTH COMPARATIVEMEASURING INSTRUMENT

Comparison test with reference sample for length andouter dimension

Measure eccentricity of pitch circle of outer gear, runout
measurement with reference to both centers▷ measuring length:MAX-150▷ center height:150 ▷ distance between center:0~350

O.B.D. COMPARATOR

I.B.D. COMPARATOR

Measure pitch circle diameter of outer gear

Measure pitch circle diameter of inner gear

▷ Measuring range:20~170▷ Supporter up & down movement:40▷ Measuring range:40~170▷ Supporter up & down movement:40

SINE CENTER

Angle measurement, runout test
▷ Center height:120▷ Distance between centers:500

12 • KOREA FIRST GAGEECCENTRICITY MEASURING
INSTRUMENTKOREA FIRST GAGE

http://www.koga.co.kr

MEASURINGHEAD & MASTER

Measuring Head and master gage for Air·Electronic Micrometer is manufactured by much
more precise processing technology than required for manufacturing gage and its durability
is maintained with high-precision and it is used as a means for efficient measuring andrationalizing by combining with Air·Electronic Micrometer.

HEAD and MASTER PLUG for outer diameter measurement

HEAD and MASTER RING for inside diameter(ELECTRONIC MICROMETER)HEAD and MASTER RING for inside diameter

STAND TYPE outer diametermeasurement

HEAD and MASTER for inner taper measurement

KOREA FIRST GAGE • 13

Dream Fulfillment Through New Mechatronics Technology

COMPUTERMEASURINGSYSTEMA system that automatically measures [outside diameter(outside width), inside diameter(insidewidth), distance, right angle, taper cylindricity, plane] by comprehensively utilizing measuring
ruler, master, COMPUTER SOFTWARE, PLC, SENSOR of Air Electrical Micrometer. Operation:
Automatic from supply to classification and discharge● DISPLAYDISPLAY MEASURING

KG-22

MEASUREMENT DATAANALYTICAL DISPLAY

Feature : Simultaneous measurement on multi-point / Measured DATA management / short and longhaul communication / Statistical process control(SPC) can be possible
Model no.

DIGITAL TYPE AIR
MICROMETERKG-22

Indicator

Monitor, operation state,decision result, measured value

Straightness

1% / FULL SCALE

Measuring point

1~36 point

Repetiliveness(stablity)±2% / FULL SCALE

Detection method

Semiconductor, A/E converter, electric

External output

Customer’s specification

Measuring ruler

A/HEAD, PLUNGER, LEVER

Air source

4~8 BarMeasuring range(minimum scale)

HI : ±99.9, LO :±999(HI : 0.1, LO : 1.0)

Voltage source

AC85~264V, 50~60HZ

Decision stage
Decision classification

Customer’s specification

Decisionclassification分

Customer’s specification

KG-18 is a Digital Air Micrometer compact designed and manufactured to be used themeasurement easily is the model where the maintenance is economic.
Model no.

KG-18

Classification

DIGITAL AIR MICROMETER

Indicator

DIGITAL 4 DIGITDecision
Classification

LED color change

Measuring point

1 CHANNEL

Stranghtness±1% / FULL SCALE

Detection
methodSemiconductor A / E converter

Repetiliveness(stablity)±2% / FULL SCALE

Measuring ruter

A/HEAD / MASTER

Polarity switch

lnner diameter / outer diameter

KG-18

External output Decision Signal(OPEN COLLECTOR), RS-232C
FULL SCALE(㎛)Measuringrange(minimum scale)

14 • KOREA FIRST GAGE

Decision stage -NG, 6-stage automatic separate indication, +NG

1 DIV.(㎛)Air source

4~8 bar120.1

Voltage source

AC85~264V, 50~60HZ

600.5Dimension

220W × 210D × 100H

120

1Weight

About 3.0kg

KOREA FIRST GAGE

http://www.koga.co.kr

COLUMN TYPE
AIR, ELECTRONICMICROMETER

KG-21 is a column-typed 3-color LED
Electricity·Air Micrometer designed andmanufactured to be used conveniently
from production site or measuring room.

Model no.

KG-21-A

KG-21-E

Classification

Air micrometer

Electric micrometerIndicator

LCD BAR 120EA, DIGITAL 4 DIGIT

Measuring point

1 CHANNEL

AIR HEAD / MASTERPLUNGER, LEVERFULL
SCALE(㎛)

1 DIV.
(㎛)

FULL
SCALE(㎛)

1 DIV.
(㎛)

120.1

120.1

240.2

240.2

600.5

600.5

120

1600

5240

21200

10

Measuring range(minimum scale)

KG-21-A

RED : +NG

GREEN : OK

AMBER : -NG

Electric

Detection method Semiconductor A/E converter
Measuring ruler

KG-21-E

A, B 2 CHANNEL

Decision stage-NG, OK, +NG

Decision
Classification

LED color change

Stranghtness±2% / FULL SCALE±1% / FULL SCALE

Repetiliveness(stablity)±2% / FULL SCALE±2% / FULL SCALE

Polarity switch

lnner diameter /outer diameter±A, ±B

External output Decision signal(OPEN COLLECTOR), RS-232C

AIRMICROMETER

Air source

4~8 barVoltage source

AC85~864V, 50~60HZ

Dimension

54W × 200D × 520H

WeightAbout 4.0kg

Flow column type air micrometer is operated by a principle of flow
measuring which measure the flow of air which flow in the precise GLASSTAPER TUBE. The fluctuation of float in the TAPER TUBE indicates thechange of slit between the gage head and workpiece.                      TypeParameters  
Standard magnification(times)

2000

3000

5000

10000

Effective indication(㎛)60402010Indication range(㎛)

100

60

4020Minimum scale(㎛)2210.5Accuracy(㎛)

1.4 MAX-

1.4 MAX-

0.6 MAX-

0.3 MAX-

Response time(sec)

KG-12-003

KG-12-001-020

0.5~1.2

Number of Column : KG-012-001(1 Column)、 KG-012-020(20 Column)。
KOREA FIRST GAGE • 15

Headoffice · Factory(Seongnam 2nd industrial complex) 133-3, Sangdaewon-dong, Jungwon-gu,
Seongnam-city, Gyeonggi-do, KoreaTel. : +82-31-749-1551
Fax. : +82-31-742-7408
E-mail : koga@koga.co.kr