Date Published:Jul. 30. 2020 Date Updated:Jan. 25. 2022

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・PEEK GF30 Polyether ether ketone 260℃
PTFE Tetrafluoroethyene 260℃
PPS Polyphenylene Sulfide 200℃
H-PVC Hard Polyvinyl Chloride 60℃
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＞PEEK GF30＞VESPEL(SCP-5000)＞PEEK＞VESPEL(SP-1)＞PC＞POM＞PVDF＞H-PVC＞PP＞PFA＞PTFE From tensile strength data
Heat Resistance VESPEL(SCP-5000)＞VESPEL(SP-1)＞PEEK・PEEK GF30・PTFE・PFA＞PPS＞PVDF＞PC＞RENY＞POM＞PP＞H-PVC From heat resistance temperature
Chemical Resistance PTFE＞PFA＞PVDF＞PP＞H-PVC・PEEK・PEEK GF30＞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 JISK7113 N/mm2 53.7
Elongation JISK7113 % 185
Charpy Impact Strength JISK7111 kJ/m2 9.8
Vicat softening point JISK7206 ℃ 83
Hardness JISK7202 HRC 103
Specific Gravity JISK7112 - 1.36

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

Physical property(PEEK GF30)

Properties Test Method Measurement condition Unit PEEK GF30
Tensile Strength ISO 527 23℃ 50%Rh N/mm2 168
Tensile Elongation ISO 527 23℃ 50%Rh % 2.1
Tensile modulus ISO 527 23℃ 50%Rh N/mm2 11
Bending strength ISO 527 23℃ 50%Rh N/mm2 259
Flexural Modulus
 ISO 527
 23℃ 50%Rh
 GPa
 11.5
Charpy Impact Strength(with Notch)
 ISO 179/1eA
 23℃ 50%Rh
 kJ/m2
 8C
Flame ClassUL94(1.6mm)
 IEC 60695
 -
 -
 V-0
Heat Distortion Temperature(1.8Ｎ/mm2)
 ISO 75
 Dry
 ℃
 327
Dielectric Constant(1MHz)
 IEC 60250
 -
 -
 3.8
Dielectric Loss Tangent(1MHz)
 IEC 60250
 -
 -
 0.007
Volume Resistivity
 IEC 60093
 -
 Ω・m
 10^13
Density
 ISO 1183
 -
 g/cm3
 1.52
Water Absorption
 ISO 62
 -
 %
 0.05
Glass Fiber Content
 - 
 -
 %
 30

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

 

Chemical resistance

Chemical Name VESPEL
SP-1		 VESPEL
SCP-5000		 PEEK・
PEEK GF30		 PTFE PPS H-PVC RENY PC PP PVDF POM PFA
10％ Hydrochloric Acid 〇 〇 〇 〇 〇 〇 × 〇 〇 〇 × 〇
10％ Sulfuric Acid 〇 〇 〇 〇 〇 〇 × 〇 〇 〇 × 〇
50％ Sulfuric Acid × △ × 〇 × - × △ - 〇 × 〇
10％ Nitric Acid △ △ 〇 〇 〇 〇 × 〇 〇 〇 × 〇
50％ Nitric Acid × × × 〇 × - × △ - 〇 × 〇
10％ Hydrofluoric Acid △ △ - 〇 △ - × 〇 〇 〇 × 〇
50％ Hydrofluoric Acid × × × 〇 × - × △ △ △ × 〇
Phosphoric Acid - - 〇 〇 △ 〇 × 〇 〇 〇 × 〇
Formic Acid △ △ △ 〇 〇 △ × 〇 〇 〇 × 〇
Phosphoric Acid 〇 〇 〇 〇 〇 - × 〇 〇 〇 △ 〇
Citric Acid 〇 〇 〇 〇 〇 〇 △ 〇 〇 〇 △ 〇
Chromic Acid - - 〇 〇 △ 〇 × 〇 〇 〇 × 〇
Boric Acid 〇 〇 〇 〇 〇 〇 △ 〇 〇 〇 - △
Methyl Alcohol △ △ 〇 〇 〇 〇 - △ - 〇 〇 〇
Glycol 〇 〇 〇 〇 〇 - - 〇 - - 〇 〇
Ammonia × △ 〇 〇 〇 〇 〇 × 〇 〇 × 〇
10％ Sodium Hydroxide × △ 〇 〇 〇 〇 〇 - 〇 〇 △ 〇
10％ Potassium Hydroxide × △ 〇 〇 △ 〇 〇 × 〇 〇 △ 〇
Calcium Hydroxide - - 〇 〇 △ 〇 × 〇 〇 〇 〇 〇
Water 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇
Hydrogen Sulfide (Gas) - - 〇 〇 〇 - 〇 〇 〇 〇 △ 〇
Sulfur Dioxide - - 〇 〇 △ - 〇 〇 〇 - 〇 〇
Ammonium Nitrate - - 〇 〇 〇 - 〇 〇 〇 〇 △ 〇
Sodium Nitrate - - 〇 〇 〇 - 〇 × 〇 〇 △ 〇
Calcium Carbonate - - 〇 〇 〇 - 〇 × 〇 〇 〇 〇
Calcium Chloride - - 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇
Magnesium Chloride - - 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇
Magnesium Sulfate - - 〇 〇 〇 - 〇 〇 〇 〇 〇 〇
Zinc Sulfate - - 〇 〇 〇 - 〇 〇 〇 〇 △ 〇
Hydrogen peroxide △ △ 〇 〇 △ 〇 △ 〇 〇 〇 × 〇
  • 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 GF30 PEEK PPS RENY PC PP PVDF PFA H-PVC
M1.7 - - - 0.038 - 0.041 0.022 - - - -
M2 - - - 0.071 0.084 0.101 0.055 - - - -
M2.6 - - - 0.15 - 0.22 0.12 - - - -
M3 0.12 0.21 0.27 0.21 0.29 0.36 0.18 - 0.11 - 0.15
M4 0.27 0.47 0.64 0.47 0.69 0.85 0.39 0.22 0.26 0.06 0.34
M5 0.54 0.98 1.45 0.96 1.23 1.65 0.8 0.39 0.44 0.1 0.62
M6 0.95 1.65 - 1.64 2.05 2.74 1.2 0.69 0.81 0.2 0.98
M8 2.26 4.04 - 3.68 5.48 6.22 3.2 1.58 1.56 0.44 2.36
M10 - - - 7.9 8.87 11.39 - 3.32 3.16 - 4.77
M12 - - - 13.64 13.7 15.93 - 5.36 5.73 - 8.25
M16 - - - - - 38.9 - - - - -

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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