DIN 653 Low Knurled-Head Thumb Screw

The German standard DIN 653 covers knurled-head thumb screws featuring a flat head of large diameter and reduced height. The edges of the head are knurled, providing convenient hand tightening and loosening without the use of additional tools.

A distinctive feature of this fastener is its short threaded portion – its length is no more than 16 mm. The thread diameter can range from M3 to M5.

Purpose and manufacturing features of the screw

The DIN 653 thumb screw is designed for creating quick-release threaded joints that are assembled and disassembled by hand. Thanks to the large head size, this fastener is convenient to use and also has good decorative qualities. Due to the reduced head height, it only slightly protrudes above the surface of the joined parts.

The knurled screw has found its main application in instrument making. This type of fastener is used for securing thin walls of instruments and housings, and it is also used for fixing stands at a certain level. Screws of this type can be quickly screwed in and out thanks to their short threaded portion. They can also be used in machine-tool building, mechanical engineering and many other industrial sectors.

The metal shank carries a full metric thread. This type of fastener is manufactured from plain steel or steel with a protective chrome, zinc or nickel coating. Also widely used are thumb screws made of stainless steel A2 and A4, brass, and other non-ferrous alloys. These materials have increased corrosion resistance, ensuring long-term durability of the screws.

Ordering terms at FLOK

FLOK supplies fasteners wholesale and retail. The products comply with the established standards.

Browse the range of fasteners on offer and choose the most suitable option from the catalogue.

Dimensions of DIN 653 knurled-head thumb screws, in mm:

dk	12	16	20
k	2.5	3.5	4
l	d
	M3	M4	M5
8
10
16

dk	12	16	20
k	2.5	3.5	4
l	d
	M3	M4	M5
8	+
10		+
16			+