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 θ)/tan θ, 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 θ satisfies θ=arc tan(P/d).

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 θ)/tan θ, 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 θ satisfies θ=arc tan(P/d).

Blind fasteners and methods of fastening are provided. A blind fastener comprises a sleeve and a mandrel. The sleeve is adapted for installation into a threaded bore in a structure. The sleeve comprises a head portion configured to receive a torque, a first sleeve end, a second sleeve end, an elongate portion extending intermediate the first sleeve end and the second sleeve end, and a cavity extending from the first sleeve end to the second sleeve end. The mandrel is at least partially disposed through the cavity of the sleeve. The mandrel comprises a first mandrel end disposed adjacent to the first sleeve end. The first mandrel end comprises an enlarged portion having a diameter greater than a diameter of the cavity. The elongate portion is configured to at least partially deform into threads of the threaded bore responsive to forcible contact between the enlarged portion and the sleeve.

The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.

The coating film peeling nut of the present invention has a notch 13 formed in an inner surface of a nut main body 10 on which a female screw 12 is formed, the notch 13 extending in a direction different from that of a lead angle of the female screw 12. The notch 13 is formed helically, and a winding direction thereof is the same as that of the female screw 12. A pitch of the notch 13 is 2 to 10 times a pitch of the female screw 12, and a depth of the notch 13 is 20 to 80% of a thread height of the female screw 12.

The disclosure is a nut structure for an electric pushing rod. The electric pushing rod has a guide screw (A) with an outer thread (A1). The nut structure includes a metal cylinder (10) and a plastic intermediate component (20). The metal cylinder (10) has a pivot hole (11) being passed through by the guide screw (A). An inner wall of the pivot (11) is provided with an inner thread (12). The plastic intermediate component (20) covers the inner thread (12) and is disposed of between the outer thread (A1) and the inner thread (12). The plastic intermediate component (20) includes a fixed side thread (21) mounted on the inner thread (12) and a driving side thread (22) screwed with the outer thread (A1). Therefore, the strength may be enhanced to avoid both the nut structure from being broken and the driving side thread (22) from getting stripped.

The disclosure is a nut structure for an electric pushing rod. The electric pushing rod has a guide screw (A) with an outer thread (A1). The nut structure includes a metal cylinder (10) and a plastic intermediate component (20). The metal cylinder (10) has a pivot hole (11) being passed through by the guide screw (A). An inner wall of the pivot (11) is provided with an inner thread (12). The plastic intermediate component (20) covers the inner thread (12) and is disposed of between the outer thread (A1) and the inner thread (12). The plastic intermediate component (20) includes a fixed side thread (21) mounted on the inner thread (12) and a driving side thread (22) screwed with the outer thread (A1). Therefore, the strength may be enhanced to avoid both the nut structure from being broken and the driving side thread (22) from getting stripped.

A method for production of an interior unit for a motor vehicle includes production of a support by injection molding, featuring an enclosed front side, wherein at a backside of the support a screw boss is formed whose drill hole is sealed by a support section in the direction of the front side of the support, which support section features a reduced wall thickness in comparison to the remainder of the support, and production of a foam layer on the enclosed front side of the support. Furthermore, the present disclosure relates to an interior unit for a motor vehicle.

An oval-shaped T-nut that is received within an oval receiver machined into the upholstered panel to be secured to a chair frame is provided. The oval shape of the T-nut prevents the oval-shaped T-nut from rotating when a screw is driven into the T-nut. Further, this eliminates the necessity of stapling the traditional plastic T-nut to the chair panel, thus saving time and money associated with the manufacture of an upholstered metal frame chair. In addition to the oval-shaped T-nut described herein, a novel U-shaped screw catch is also provided which cooperates with a barbed nylon or plastic push rivet to secure the upholstered chair panels to one another. Further, a method for connecting upholstered seat back panels to the tabs positioned on the back frame of a chair, utilizing the T-nut and the screw catch is disclosed.

A multi-material boss, configured for fastening of a fastener thereto, being a feature of a die cast part, comprising a boss cylinder, an augmenting cylinder, and a filler metal layer is provided. The boss cylinder is made of the same material as the die cast part having a first hardness, and has a first interior. The augmenting cylinder is made of an augmenting material having a second hardness, is fixedly secured in the first interior of the boss cylinder, and has a second interior defined by a second cylindrical shaped wall, a base rim, and a second opening. The second hardness is greater than the first hardness. The fastener is fastened to the multi-material boss via the second opening of the augmenting cylinder having the higher liquidus temperature and greater hardness.