Date Published:Feb. 07. 2016

Plastic Screw Property

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Plastic Screw Property

  • While these plastics screws comply with JIS and ISO standards, there are some areas irrelevant to these screws as their manufacturing methods differ from that of metal screws.
  • The values in the mechanical properties chart are reference values.
  • Use a torque driver or torque wrench when tightening.
  • Always carry out tests under performance conditions similar to actual conditions in advance.
  • The color of machine screws, bolts, nuts, and washers may differ by lot.

Abbreviation, name and heat resistance temperature of resin

Abbreviation Name Heat resistance temperature
VESPEL SP-1 288℃
SCP-5000 350℃
PEEK Polyether ether ketone 180℃
PTFE Tetrafluoroethyene 260℃
PPS Polyphenylene Sulfide 200℃
H-PVC Hard Polyvinyl Chloride 35℃
RENY Reny 105℃
PC Polycarbonate 115℃
PP Polypropylene 65℃
PVDF Polyvinylidene Fluoride 150℃
POM Polyacetal 95℃
PFA Perfluoroalkoxy Alkane 260℃

The heat resistance temperatures in the chart are for the plastic material.
The max. operating temperature of the product changes with performance conditions such as tightening torque.

  • VESPEL is a registered trademark of DuPont.
  • RENY is a registered trademark of Mitsubishi Engineering-Plastics Corporation.

Plastic screw selection standards

Strength RENY>PPS>VESPEL(SCP-5000)>PEEK>VESPEL(SP-1)>PC>POM>PVDF>PP>H-PVC>PFA>PTFE From tensile strength data
Heat Resistance VESPEL(SCP-5000)>VESPEL(SP-1)>PTFE・PFA>PPS>PEEK>PVDF>PC>RENY>POM>PP>H-PVC From heat resistance temperature
Chemical Resistance PTFE>PFA>PVDF>H-PVC・PP>PEEK>PPS>PC>VESPEL(SCP-5000)>VESPEL(SP-1)>RENY>POM From chemical resistance data

Physical property

Properties Test
Method
Unit VESPEL
SP-1
VESPEL
SCP-5000
PEEK PTFE PPS RENY PC PP PVDF POM PFA
Tensile Strength D638 N/mm2 86 160 97 24 185 285 62 36 57 60 28
Tensile Elongation D638 % 7.5 7 65 200 - 400 1.9 2.1 110 500 70 - 80 60 88
Flexural Strength D790 N/mm2 110 247 156 - 255 380 88.2 - 75 90 -
Flexural Modulus D790 GPa 3.1 5.7 4.1 0.56 13.2 17.4 2.3 1.5 1.99 2.58 0.48
Izot Impact (with Notch) D256 J/m 42.7 - 94 160 100 110 880 30 160 - 375 63 No fracture
Rockwell Hardness D785 R and M Scales M90 M100 M99 - M100 M111 R120 R100 R93 - 116 M80 -
Deflection Temp. under Load(1.82 MPa) D648 360 350 152 - 260 234 135 120 80 110 -
Flame Class UL94 - V-0 V-0 V-0 V-0 V-0 HB V-2 HB V-0 HB V-0
Dielectric Constant(106Hz) D150 - 3.6 3.3 3.3 <2.1 4.6 4.0 2.9 - 10 3.7 <2.1
Dielectric Loss Tangent(106Hz) D150 - 0.0034 0.001 0.003 <0.0002 0.002 0.009 0.009 - 0.015 0.007 0.0003
Volume Resistivity(×1014) D257 Ω・m 1 - 10 1 4.9 >100 1.0 1.3 4.0 1.0 0.1 - 1 1 >100
Dielectric Breakdown Strength D149 MV/m 22 - 17 19 12 32 16 31 300 19 20
Arc Resistance D495 sec - - 23 >300 120 129 120 - - 240 >300
Specific Gravity D792 - 1.43 1.43 1.30 2.14 - 2.2 1.66 1.65 1.20 0.91 1.79 1.41 2.15
Water Absorption
(in 23 °C Water for 24 h)
D570 % 0.240 0.080 0.500 0.010 0.015 0.140 0.150 0.010 0.030 0.22 0.01
Glass Fiber Content - % - - - - 40 50 - - - - -

Values in chart are for reference only. They are not guaranteed values.

Physical property (H-PVC)

Properties Test Method(JIS) Unit H-PVC
Tensile Strength JISK7162 Test Speed:10mm/min N/mm2 38.8
Tensile Elongation JISK7162 Test Speed:200mm/min % 188
Hardness JISK7215 10seconds later(2mm thickness 3 sheets overlaid) Hs 97
Specific Gravity JISK7112 Method A - 1.32

Values in chart are for reference only. They are not guaranteed values.

Chemical resistance

Chemical Name VESPEL
SP-1
VESPEL
SCP-5000
PEEK PTFE PPS H-PVC RENY PC PP PVDF POM PFA
10% Hydrochloric Acid × ×
10% Sulfuric Acid × ×
50% Sulfuric Acid × × × × - ×
10% Nitric Acid × ×
50% Nitric Acid × × × × × - ×
10% Hydrofluoric Acid - × ×
50% Hydrofluoric Acid × × × × × ×
Phosphoric Acid - - × ×
Formic Acid × ×
Phosphoric Acid ×
Citric Acid
Chromic Acid - - × ×
Boric Acid -
Methyl Alcohol - -
Glycol - - - -
Ammonia × × ×
10% Sodium Hydroxide × -
10% Potassium Hydroxide × ×
Calcium Hydroxide - - ×
Water
Hydrogen Sulfide (Gas) - - -
Sulfur Dioxide - - - -
Ammonium Nitrate - - -
Sodium Nitrate - - - ×
Calcium Carbonate - - - ×
Calcium Chloride - -
Magnesium Chloride - -
Magnesium Sulfate - - -
Zinc Sulfate - - -
Hydrogen peroxide ×
  • 〇:Usable
  • △:Usable under certain conditions
  • ×:Non-usable

A test piece was used to acquire the test data at room temperature (23°C). Chemical resistance changes with performance conditions. Always carry out tests under performance conditions similar to actual conditions in advance.

Torsional rupture torque of plastic screws (N・m)

VESPEL
SP-1
VESPEL
SCP-5000
PEEK PTFE PPS H-PVC RENY PC PP PVDF PFA
M1.7 - - 0.02 - - - 0.03 0.02 - - -
M2 - - 0.06 - 0.08 - 0.1 0.05 - - -
M2.6 - - 0.16 - - - 0.24 - - - -
M3 0.12 0.21 0.3 0.02 0.36 - 0.39 0.22 - - -
M4 0.27 0.47 0.64 0.03 0.71 0.18 0.79 0.54 0.23 - 0.04
M5 0.54 0.98 1.28 0.08 1.42 0.41 1.77 1.03 0.51 0.64 0.21
M6 0.95 1.65 2.26 0.14 2.11 0.65 2.94 1.37 0.8 0.88 0.35
M8 2.26 4.04 5.98 0.24 5.29 - 7.85 - 2.2 2.65 0.85
M10 - - - 0.69 11.8 - 12.75 - 3.4 - -
M12 - - - 1.54 20.6 - - - - - -

Values in chart are for reference only. They are not guaranteed values. The recommended torque is 50% of the value in the chart.The value differs depending on the head shape of the screw. See the product page for details.

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