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carbon golf shaft

Features of ShaftTechnology

Design and Analysis Technologies Technology

Simulation using our company’s unique calculations of strengths and shapes produces excellent carbon golf club shafts.

Design System We select materials and design fiber orientation and resin content rate to produce shafts in line with shaft characteristics obtained by simulation.
  • We develop our products from materials We develop our products from materials

    We develop our own materials, which allows us to produce a variety of designs.

  • High-precision processing technology High-precision processing technology

    High-precision manufacturing technology lies behind the high-precision design.

  • Detailed analysis Detailed analysis

    Detailed analysis ensures sophisticated design.

Material Technology

From polymer to fiber, our technical capabilities to develop all of materials open infinite possibilities of golf club shafts.

  • Fiber Material Fiber Material

    Fiber Material

  • Fabric (Carbon) Fabric (Carbon)

    Fabric (Carbon)

  • Specialty Thermal Property Epoxy Resin Specialty Thermal Property Epoxy Resin

    Specialty Thermal Property Epoxy Resin

  • Prepreg Prepreg


Manufacturing Technology

Our unique autoclave manufacturing methods and FRP precision molding techniques of top craftsmen have enabled us to manufacture high precision and quality shafts.

Carbon Sheet

The carbon that is used in carbon shafts has a property that hardens when heat is applied (such as when cured in an autoclave). We use this property to manufacture our shafts.

Most carbon shafts currently on the market are fabricated by wrapping the core metal (or mandrel) with a prepreg (a thermal shrinkable carbon sheet), and then cured in an oven.The core metal is wrapped with thermal shrinkable tape because tension is usually insufficient under 1 atm. However, removal of the tape causes unevenness on the surface of the shaft. This method requires the grinding of the shaft to remove any unevenness and to make it perfectly round. The process often results in individual variabilities in elasticity and rigidity.

Carbon Sheet

IMIDE AND SUNS manufacturing method is the same up till the point of wrapping the core metal with the prepreg. (The core metal itself is designed and fabricated to a high accuracy.)
Then we use exclusive molds for curing in an autoclave large enough to apply 6 to 10 atm to the molds without using thermal shrinkable tape.
This way, the shafts do not have unevenness on their surface after curing. Without unevenness, the processes of grinding and painting the surface are no longer required, and as a result, each one of our shafts is fabricated in line with its intended design. As with the standard quality in the field of aerospace, grinding of the carbon does not take place.

Differences in manufacturing methods

IMIDE AND SUNS manufacturing method

IMIDE AND SUNS manufacturing method

IMIDE AND SUNS manufacturing method

IMIDE AND SUNS manufacturing method

  • Dedicated curing mold Dedicated curing mold

    1. Exclusive curing molds

    We use exclusive curing molds.

  • Curing in an autoclave Curing in an autoclave

    2. Curing in an autoclave

    Shafts are cured at 6-10 atm.

  • Grinding less

    3. No grinding


  • Painting less Painting less

    4. No coating

    In order to have a feel for the carbon material, no coating is used.

General manufacturing methods

(Our research)

General manufacturing methods (our research)
  • Shrinkable tape Shrinkable tape

    1. Shrinkable tape

    Tension is applied by wrapping the core metal with shrinkable tape.

  • Curing in an oven Curing in an oven

    2. Curing in an oven

    Shafts are cured at 1 atm.

  • With a griding process With a griding process

    3. Grinding

    Removing the tape causes unevenness on the surface. To satisfy individual specifications, the entire shaft is ground.

  • With a coating process With a coating process

    4. Coating is used

    Coating is added on top of the carbon, increasing the weight of the shaft.


Benefits of IMIDE AND SUNS Manufacturing Method

To fabricate a shaft in line with its characteristics as obtained through simulation, we select materials, orientation of fibers and content rates of fibers and resin.

  • Ultra high precision

    No variation

    • Clubs are formed in line with specifications. External form and inner diameter are consistent.

  • Principles to improve carry distance by weight reduction

    Principles on improving carry distance through weight reduction

    V1: head speed V2 ‘: initial ball speed M: head weight
    m: ball weight e: coefficient of restitution

  • Lighter shaft = Longer carry distance

    Lighter shaft = Longer carry distance

    Why flex remains the same with a lighter shaft
    • No coating reduces weight by 3-4g.
    • Curing in an autoclave minimizes the amount of resin.
    • Optimum lightweight design.

Store Locations

If you are considering purchasing any of our products, please visit your nearest showroom.
The haute couture design Series is available at Tokyo Shibaura and Hyogo Shukugawa only.