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

Plastic Screw Property

PDF
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.



Engineering Tips HINTS for NEW IDEAS

Examples to help you resolve any issues you may have.

Technical Data Others Machine Tools Semiconductor Manufacturing Equipment Food Machinery Automotive Manufacturing Process Medical Equipment FA Devices Technical Data Special Screws