Phillips pan head screws are the most commonly used fasteners. They have a disk-shaped head and a cross-shaped notch on the top. They can be tightened or removed with a Phillips screwdriver. Represented by the letters PM. The thread specifications are M1.6-M10, the performance levels have 4.8, A-50, A2-70, CU2, CU3 and AL4,According to the head slot styles,There are 2 types of H-type and Z-type cross recessed. This kind of screw is widely used in machinery, electronics, electrical appliances, furniture and other fields. GB/T818-2016 Cross recessed pan head screws is a Chinese standard that specifies the dimensions, technical requirements, inspection methods, acceptance rules, marking and packaging of cross recessed pan head screws. Its material can be carbon steel, stainless steel, copper, aluminum, titanium, etc. Surface treatment: galvanized, nickel, zinc-nickel alloy, electrophoresis, Dacromet, CD pattern, PVD, etc.
Equivalent standards of GB818: ISO 7045, DIN EN ISO 7045, UNI 7687, NF E 25-121
The Specification Form of GB818 is as bellow
| GB818 | M | |||||||||||||
| D | 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | ||||
| P | Pitch | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | |||
| a | max | 0.7 | 0.8 | 0.9 | 1 | 1.2 | 1.4 | 1.6 | 2 | 2.5 | 3 | |||
| da | 2 | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | ||||
| dk | max=nominal size | 3.2 | 4 | 5 | 5.6 | 7 | 8 | 9.5 | 12 | 16 | 20 | |||
| min | 2.9 | 3.7 | 4.7 | 5.3 | 6.64 | 7.64 | 9.14 | 11.57 | 15.57 | 19.48 | ||||
| k | max=nominal size | 1.3 | 1.6 | 2.1 | 2.4 | 2.6 | 3.1 | 3.7 | 4.6 | 6 | 7.5 | |||
| min | 1.16 | 1.46 | 1.96 | 2.26 | 2.46 | 2.92 | 3.52 | 4.3 | 5.7 | 7.14 | ||||
| r | min | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | |||
| R | ≈ | 2.5 | 3.2 | 4 | 5 | 6 | 6.5 | 8 | 10 | 13 | 16 | |||
| x | max | 0.9 | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 | |||
| Socket No. | 0 | 0 | 1 | 1 | 2 | 2 | 2 | 3 | 4 | 4 | ||||
| M1 | Type H | Ref. | 1.7 | 1.9 | 2.7 | 3 | 3.9 | 4.4 | 4.9 | 6.9 | 9 | 10.1 | ||
| Penetration depth |
Type H | max | 0.95 | 1.2 | 1.55 | 1.8 | 1.9 | 2.4 | 2.9 | 3.6 | 4.6 | 5.8 | ||
| min | 0.7 | 0.9 | 1.15 | 1.4 | 1.4 | 1.9 | 2.4 | 3.1 | 4 | 5.2 | ||||
| M2 | Type Z | Ref. | 1.6 | 2.1 | 2.6 | 2.8 | 3.9 | 4.3 | 4.7 | 6.7 | 8.8 | 9.9 | ||
| Penetration depth |
Type Z | max | 0.9 | 1.42 | 1.5 | 1.75 | 1.93 | 2.34 | 2.74 | 3.46 | 4.5 | 5.69 | ||
| min | 0.65 | 1.17 | 1.25 | 1.5 | 1.48 | 1.89 | 2.29 | 3.03 | 4.05 | 5.24 | ||||
Product standard of this physical picture: GB818
Spec:M4-0.7*14 Strength Class：4.8 Material:1008 Surface treatment:black zinc plated,Salt Spray Test 24H
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