Quality is the TRUE MEASURE
of productivity
(Peter F. Drucker)

Total Quality Management Systems
for hot forging and heat treatment bolts

Tohoku bolt introduced a Quality Management System to keep providing high quality reliable JIS products as Japanese Industrial Standards licensed factory. We obtained Japanese Industrial Standards written permission for “JIS E 1108 Dog spike” in October in 1952. Shortly after that, we obtained the other JIS written permission for “Hexagon heat bolt” and “Fish plate bolt”. Including the “Screw spike”, we obtained in total 4 JIS written permissions and 4 JIS certifications. In order to keep earning our clients’ confidence, we will proactively continue improving our quality management system.

The main qualification experience

General heat treatment Professional Skills Level 1
1 staff
Level 2
7 staff
Level 3
8 staff
Metal heat treatment Super Master program graduate
1 staff
   
Non-destructive test engineer      
  Magnetic particle examination Level 2
1 staff
Level 1
2 staff
 
  Liquid penetration examination   Level 1
1 staff
 
  Ultrasonic inspection   Level 1
1 staff
 
ISO internal auditor 6 staff    
JIS quality management officer 1 staff    

Our product certification

Certificated product name
Hexagon bolt

Japanese Industrial Standards No.
JISB1180

Certification No.
JQ0208021

Grade or type
4.6、6.8、8.8、10.9

Certificated product name
Fish plate bolt

Japanese Industrial Standards No.
JISE1107

Certification No.
JQ0208022

Certificated product name
Dog spike

Japanese Industrial Standards No.
JISE1109

Certification No.
JQ0208024

Certificated product name
Screw spike

Japanese Industrial Standards No.
JISE1108

Certification No.
JQ0208023

ISO9001-2008

Certification body
MOODY INTERNATIONAL CERTIFICATION

Certification No.
JQ0208021

Strength
4.6、6.8、8.8、10.9

Main inspection equipment


  • Horizontal wet type magnetic
    particle flaw detector

  • 3000kN Universal Tensile tester 3000kN
    (press and bending)

  • Charpy Impact tester

  • Rockwell Hardness tester

  • Brinell Hardness tester

  • Micro Vickers Hardness tester

  • 1000kN Torque tester
PAGETOP