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Home / Products / Screws / Drilling Screws / JIS B 1124:2021 Oval Countersunk Head Phillips Self-Drilling Tapping Screw

JIS B 1124:2021 Oval Countersunk Head Phillips Self-Drilling Tapping Screw

JIS B 1124:2021 Oval Countersunk Head Phillips Self-Drilling Tapping Screw adopts a JIS-standard Phillips oval countersunk self-drilling tapping design to meet the needs of applications requiring JIS specification compatibility, a rounded finished appearance, and fast sheet metal fastening.

The oval countersunk head maintains a neat surface after seating, while the drill point and tapping thread reduce pre-drilling, tapping, and nut usage. Its advantages lie in a clear installation method, well-defined load path, and good adaptability across different materials and installation spaces.

This product is suitable for Japanese-standard equipment, appliance housings, metal panels, light frames, and export project supply. JIS dimensions, coating color, and corrosion-resistance grade can be adjusted for the final application, balancing cost control, corrosion protection, and assembly consistency.

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PREV：DIN 7504 (R):1995 Oval Countersunk Head Phillips Self-Drilling Tapping Screw NEXT：DIN 7504 (L):1995 Slotted Self-Drilling Tapping Screw

Dimensions unit: inch 

Thread size d

ST2.9

ST3.5

ST4.2

ST4.8

ST5.5

ST6.3

5

6

P

Pitch

1.1

1.3

1.4

1.6

1.8

1.8

1.6

1.8

a

Max.

1.1

1.3

1.4

1.6

1.8

1.8

1.6

1.8

dk

Theoretical value 

Max.

6.3

8.2

9.4

10.4

11.5

12.6

-

-

Actual value 

Max.

5.5

7.3

8.4

9.3

10.3

11.3

10

12

Min.

5.2

6.9

8

8.9

9.9

10.9

9.4

11.3

f

≈

0.7

0.8

1

1.2

1.3

1.4

1.2

1.4

k

Max.

1.7

2.35

2.6

2.8

3

3.15

2.8

3.4

r

Max.

1.2

1.4

1.6

2

2.2

2.4

1.2

1.4

R

≈

6

8.5

9.5

9.5

11

12

11

13.5

Slot number

1

2

2

2

3

3

2

3

M1

Type H

Reference

3.4

4.8

5.2

5.4

6.7

7.3

5.3

6.9

Depth

Type H

Max.

2.2

2.75

3.2

3.4

3.45

4

3.13

3.46

Min.

1.8

2.25

2.7

2.9

2.95

3.5

2.58

2.9

M2

Type Z

Reference

3.3

4.8

5.2

5.6

6.6

7.2

5.1

6.6

Depth

Type Z

Max.

2.1

2.7

3.1

3.35

3.4

3.85

3.05

3.4

Type Z

Min.

1.8

2.25

2.65

2.9

2.95

3.4

2.6

2.95

 Drilling range (plate thickness) 

≥

0.7

0.7

1.75

1.75

1.75

2

1.75

2

≤

1.9

2.25

3

4.4

5.25

6

4.4

6

Lg Min.

-

-

-

-

-

-

-

-

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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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