Karasu 1 Sen Brass (Reverse) <Screw Back>

DESCRIPTION

DESCRIPTION

1938
90% copper, 10% zinc
Screw Back

Made in Japan

Sample picture of Screw Back


Screw types
Round Head is for attaching The Concho directly on leather as decoration.
Flat Head is for attaching as snap fastener with a large size Snap Fastener.



Choice of screw size
Choose shorter screws and push into leather tightly when attaching.
Long screws are easy to attach but will be loosen over time as concho fitting in with leather.

Screw sizes
Please refer to the following for choosing size of screw according to thickness of leather for attaching concho.

Thickness of the Leather	Length of the Screw
Approx. 2.0 mm	3 mm long　+　Adjust with the Leather Washer
Approx. 3.5 mm	3 mm long
Approx. 5.0 mm	5 mm long（Adjust with the Leather Washer if required.）

* This is for reference only. Suitable sizes may be different according to leather types, diameter of concho and other conditions.
* Adjust with Leather Washer when screws are too long.

SIZE

23 mm in diameter

Matching sizes of male and female screws

Use 3 millimeters female screw for 3 millimeters male screw.

Use 5 millimeters female screw for 5 millimeters male screw.

Female Screw / 5.2mm in diameter
Use Round Hole Punch #18.


Flat Head Male Screw can be used with both male and female parts of Snap Fastener.

HOW TO USE

Screw back concho can be attached as a Snap Fastener being fixed with a large size Snap Fastener.