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DIN 7504 (L):1995 Slotted Self-Drilling Tapping Screw

DIN 7504 (L):1995 Slotted Self-Drilling Tapping Screw features a slotted hex washer head, drill point, and tapping thread, making it suitable for metal connections requiring higher external-drive torque and a larger bearing surface.

The hex washer head helps distribute clamping force, the slot provides an auxiliary drive option, and the self-drilling tapping design supports direct field installation. This structure supports efficient assembly while balancing joint stability, load distribution, and convenient maintenance, making it practical for standardized purchasing and volume production.

This product can be used in roofing sheets, cladding systems, ventilation fittings, metal brackets, and outdoor mounting parts. Sealing washers, anti-corrosion coatings, and different drill point lengths can be selected to meet requirements for corrosion protection, wear resistance, assembly efficiency, and long-term reliability.

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Dimensions unit: inch 

Thread size

ST2.9

ST3.5

(ST3.9)

ST4.2

ST4.8

ST5.5

ST6.3

P

Pitch

1.1

1.3

1.3

1.4

1.6

1.8

1.8

c

Min.

0.4

0.6

0.6

0.8

0.9

1

1

dc

Max.

6.3

8.3

8.3

8.8

10.5

11

13.5

Min.

5.8

7.6

7.6

8.1

9.8

10

12.2

e

Min.

4.28

5.96

5.96

7.59

8.71

8.71

10.95

k

Max.

2.8

3.4

3.4

4.1

4.3

5.4

5.9

Min.

2.5

3

3

3.6

3.8

4.8

5.3

r

Max.

0.4

0.5

0.5

0.6

0.7

0.8

0.9

s

Max.

4

5.5

5.5

7

8

8

10

Min.

3.82

5.32

5.32

6.78

7.78

7.78

9.78

n

Nominal

0.8

1

1

1.2

1.2

1.6

1.6

Min.

0.86

1.06

1.06

1.26

1.26

1.66

1.66

Max.

1

1.2

1.2

1.51

1.51

1.91

1.91

t

Min.

1

1.2

1.2

1.44

1.52

1.92

2.12

dp

2.3

2.8

3.1

3.6

4.1

4.8

5.8

Drilling range (plate thickness)

0.7~1.9

0.7~2.25

0.7~2.4

1.75~3

1.75~4.4

1.75~5.25

2~6

Lg (Min)

-

-

-

-

-

-

-

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Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010.

The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.

With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.

Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery

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