M4 Phillips Drive Black Plastic Screws Countersunk Head Machine Screw
M4 Phillips Drive Black Plastic Screws Countersunk Head Machine Screw Plastic countersunk head machine screws , phillips drive socket ,standard machine full threads , flat point and 120° angle for countersunk head . Material Plastic Nylon PA66 with fire resistant grade UL94V-2 Specification Thread diameter D M4 Thread length L 15 Head height K 2.2 Head diameter dk 8 Drive Standard PH2 All sizes are in millimeter Tolerance Plastic countersunk head machine screws are referred
M4 Phillips Drive Black Plastic Screws Countersunk Head Machine Screw
Plastic countersunk head machine screws , phillips drive socket ,standard machine full threads , flat point and 120° angle for countersunk head .
Material
Plastic Nylon PA66 with fire resistant grade UL94V-2
Specification
| Thread diameter | D | M4 |
| Thread length | L | 15 |
| Head height | K | 2.2 |
| Head diameter | dk | 8 |
| Drive | Standard | PH2 |
All sizes are in millimeter
Tolerance
Plastic countersunk head machine screws are referred to ISO , GB standards and ISO 2768 for unspecified tolerances
| Thread diameter | Standard |
| Thread length | ±0.5 |
| Head height | ±0.1 |
| Head diameter | ±0.1 |
| Drive | Standard |
All sizes are in millimeter
Electrical Performance
Plastic countersunk head machine screws with good insulation , electrical data as following :
Dielectric constant : 1.63
Arc resistance sec : 130～140
Specific volume resistance Ω·cm : 1.83×1015
Dissipation factor : 118
Physical Performance
Density ( g/cm3): 1.14
Water absorption % : 3
Shrinkage % : 1～2
Thermal Performance
Plastic countersunk head machine screws are used in wide temperature , they are resistant high temperature and low temperature .
Normal working temperature ℃ : 80～120
Brittle temperature ℃ : -30℃
Melting temperature ℃ : 252
Pyrogenic decomposition temperature ℃ : 350℃
Matin heatproof ℃ : 50～60
Mechanical Property
Plastic countersunk head machine screws with good mechanical property
Tensile strength MPa : 60～80
Elongation at break % : 2.2
Bending strength MPa : 100～120
Modulus of elasticity for bending MPa : 2000～3000
Notched Impact Strength(J/m) : 60～100
H hardness : 118
Features
1 , Wear resistance
2 , Good self-lubricant
3 , High mechanical property
4 , Resistant high temperature
Normally , plastic machine screws can be operated smoothly at temperature 150℃ and thermal deformed temperature is up to 250℃ when parts with glass fiber .
5 , Perfect elongation
Elongation at break is 2.2% according to ISO 527 testing method .
6 , Corrosion resistance
7 , Good insulation
Specific volume resistance is 1.83×1015 and resistance to high breakdown voltage support part to be good insulated .
8 , Resistant impact
60 – 80 KJ/M2 normally .
9 , Resistant fire
Generally , the fire resistance is UL94V-2 and UL64V-0 for special parts .
10 , Resistance to low temperature
Plastic machine screws can be workable at -30℃
11 , Environment friendly
Plastic machine screws meet RoHS or REACH environmental production standard .
Application
Plastic machine screws are widely used to various fields that with light load and strict conditions on corrosion resistance and insulation as perfect features .
1 , Chemical industry
2 , Car industry
3 , Household appliances
4 , Official equipments
5 , Aerospace
6 , Sports equipments
7 , Technology and research device
8 , Petro industry
9 , Vessel
Additional Colors
We can provide more colors except Black for plastic countersunk head machine screws ,
Popular colors as white ,green ,red ,yellow ,golden and beige .
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