Division of Bolts

80-year tradition of bolt-manufacturing technology plus unique surface treatment technology

Division of Bolts

80-year tradition of bolt-manufacturing technology plus unique surface treatment technology

From Takenaka’s core business since establishment, world-leading bolt manufacturing business, and our screw business, we have further evolved our surface treatment business to produce products with high added value: these two comprise the business of the Fastener Division.

Division of Bolts

We meet customers’ demands with our order-made service.

Our Products of Nuts and Bolts

TAKENAKA THE ONLYONE

We are inventing products that meet the diverse demands of our customers.

To meet the broad range of customers' needs, we are prepared to supply various nuts and bolts ranging from ultra-precision machined products to hot forged ones and from common steel to special steel products. Our markets are now expanding worldwide as well as domestically. Takenaka bolts are in use in so many areas such as nuclear power plants, towers of wind power, oil refinery and natural gas plants. High quality of Takenaka products are assured by our production system that is consistent throughout from receiving raw materials to distributing final products.

  • Division of Bolts01
  • Division of Bolts02
  • Division of Bolts03

Takenaka is a made-to-order manufacturer. Once we receive our customer’s drawings or specifications, we make the product in line with those details. Below are numerous examples of products that customers have ordered from Takenaka.

Quality Assurance page

  • Major Material (JIS)Major Material (JIS))

    • ・Alloy steel bolting materials for high temperature service(SNB)
    • ・Stainless steel (SUS)
    • ・Heat-resisting steel(SUH)
    • ・Nickel, chromium, molybdenum-containing alloy steel(SCM,SNCM)
    • ・Carbon steel(S〇〇C)
    • ・Superalloy(ex.high nickel, duplex stainless steel)
    • ・Structural bolts (4.6,8.8,10.9 etc.)
  • Major Material (Over seas)Major Material (Over seas)

    • ASTM
      • ・A193
      • ・A194
      • ・A320
      • ・A307
      • ・A563
      • ・A325(F3125)
    • ASTM,ASME,AISI,ISO,DIN etc.
      (For further details, please cotact to us.)
  • CertificationCertification

    • ・hexagon head bolt:JIS B1180
      hexagon nut:JIS B1181
      sets of high strength hexagon bolt, nut, and plain washers for friction grip joints:JIS B 1186
      sets of high strength stainless steel hexagon bolt, nut, and plain washers forstructure:SSBS301
      TAKECOAT®-1000 coated set of high strength hexagon bolt, nut, and flat washer
    • ・ISO9001
    • ・hot-dip-galvanized set of high strength hexagon bolt, nut, and plain washers for a wind power facility-supporting structure
    • ・set of high strength hexagon bolt, nut, and plain washers for a wind power facility-supporting structure
    • ・TAKECOAT®-1000 coated set of high strength hexagon bolt, nut, and flat washer
    • ・set of high strength anchor bolt, nut, and flat washer for a wind power facility-supporting structure

Division of Corrosion Engineering

Reshaping past concepts with innovative technology

Coating Products

TAKENAKA’s Special Technology of Surface Treatment, excellent in rust and corrosion prevention

TAKENAKA THE ONLYONE

TAKENAKA’s Special Technology of Surface Treatment recognized worldwide

The drawback of metals, their susceptibility to corrosion, causes numerous problems.
To meet the needs of customers with those problems, Takenaka has successfully developed TAKECOAT-1000, the world’s first fluorocarbon resin coating for bolts, in an industry-academia tie-up with Kyoto University.
Other Takenaka inventions include TAKECOAT® CERAMIC 1, which prevents seizing, and Nanotect® surface treatment, which uniformly disperses CNTs in a high-density resin coating. Takenaka is now playing an active part in a wide range of areas, applying these surface treatments to a wide variety of metal products, as well as screws.

  • Division of Corrosion Engineering
  • Division of Corrosion Engineering