Abstract: There is provided a nut in which occurrence of galling is prevented. The nut in which a depth t of a counterbore hole is set to be greater than (D?d×cos ?)/tan ?, when a nominal diameter is D, an average value of a maximum outer diameter and a minimum outer diameter taking into account a tolerance of a bolt to be fitted is d [mm], an inner diameter of the counterbore hole provided on an insertion side of a screw hole is D+0.2 [mm], a pitch of a screw thread is P [mm], and ? satisfies ?=arc tan(P/d).

Abstract: There is provided a nut in which occurrence of galling is prevented. The nut in which a depth t of a counterbore hole is set to be greater than (D?d×cos ?)/tan ?, when a nominal diameter is D, an average value of a maximum outer diameter and a minimum outer diameter taking into account a tolerance of a bolt to be fitted is d [mm], an inner diameter of the counterbore hole provided on an insertion side of a screw hole is D+0.2 [mm], a pitch of a screw thread is P [mm], and ? satisfies ?=arc tan(P/d).

Abstract: An FRP product of the state that a printed material is covered on its back surface side with a transparent surface mat by coating a surface of a mold with a gel coating to become an outer surface through a mold release agent, laying a glass mat of unsaturated polyester resin-impregnated reinforced fiber on the gel coating, further laying a glass mat of the same material sufficiently by pressure of a roller or a brush on the gel coating, laying a printed material for indicating the material at an arbitrary position thereon, laying, for example, a transparent surface mat of unsaturated polyester resin-impregnated glass fiber by pressure of a presser such as a roller or a brush or the like on the printed material, and hardening together them, and an indication method thereof is obtained.Thus, an indication of the material of the FRP product to be displayed on a back surface side of the hand-lay-up FRP product can be accurately confirmed from outside for a long period of time.

Abstract: A fiber reinforced plastic (FRP) product having a label that includes information pertaining to the type of material of the product for recycling purposes. The label is covered on its back surface side with a transparent surface mat. The product is formed by coating a surface of a mold with a gel coating to become an outer surface through a mold release agent, laying a glass mat of unsaturated polyester resin-impregnated reinforced fiber on the gel coating, further laying a glass mat of the same material and applying pressure of a roller or a brush on the gel coating, laying a label with printed material for indicating the material at an arbitrary position on one of the glass mats, laying, for example, a transparent surface mat of unsaturated polyester resin-impregnated glass fiber by pressure of a presser such as a roller or a brush or the like on the label, and consolidating each of the components to form the final product.

Abstract: A fiber reinforced plastic (FRP) product having a label that includes information pertaining to the type of material of the product for recycling purposes. The label is covered on its back surface side with a transparent surface mat. The product is formed by coating a surface of a mold with a gel coating to become an outer surface through a mold release agent, laying a glass mat of unsaturated polyester resin-impregnated reinforced fiber on the gel coating, further laying a glass mat of the same material and applying pressure of a roller or a brush on the gel coating, laying a label with printed material for indicating the material at an arbitrary position on one of the glass mats, laying, for example, a transparent surface mat of unsaturated polyester resin-impregnated glass fiber by pressure of a presser such as a roller or a brush or the like on the label, and consolidating each of the components to form the final product.

Abstract: A fiber reinforced plastic product such as a bumper having a label with information that preferably provides recycling information concerning the product. The product is formed by applying a mold release agent to a fiber reinforced plastic mold and then applying a gel coating over the release agent. A first resin impregnated fiber mat is place on the gel coating and a second resin impregnated fiber mat is placed over the first. The mats are pushed into contact with one another by a roller or brush or the like to adhere the two mats to one another. The label is placed in contact with one of the fiber mats while the mat is in an unhardened state. A transparent surface mat is positioned over the label so as to cover and protect the label and such that the label is easily viewed.