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

All sizes are in millimeter

Tolerance

Plastic countersunk head machine screws are referred to ISO , GB standards and ISO 2768 for unspecified tolerances

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 .