The Properties of Ceramic Screws

Physical Properties

Properties Inconel*
(NCF600)
SNSI
Pure Molybdenum
SNSM
Hastelloy*
C-276
(NW0276)
SNSH-C276
Hastelloy*
C-22
(NW6022)
SNSH-C22
Nickel
(NW2201)
SNSN
Super Invar
SNSIV
Phosphor Bronze
(C5191)
SNSP
Aluminum Alloy
(A5056)
SNSA
Specific Gravity 8.42 10.2 8.89 8.61 8.89 8.15 8.83 2.64
Longitudinal Elastic Modulus (GPa) 207 327 205 209 206 132 105 71.7
Thermal Conductivity (W/(m・K) 16.7 142 79.5 10.47 67 112
Linear Expansion Coefficient(K-1) 13.4×10-6 5.1×10-6 11.2×10-6 12.4×10-6 13.4×10-6 0.69×10-6 18×10-6 24.1×10-6
Electric Resistance (μΩ・m) 1.0 0.058 1.3 1.2 0.085 0.77 0.13 0.064
  • Values in chart are for reference only. They are not guaranteed values.

Chemical Resistance of Ceramic Screws

Chemical Name Temperature Hour Effect
35% Hydrochloric Acid Boiling 30 minutes
70% Nitric Acid Boiling 30 minutes
98% Sulfuric Acid Boiling 30 minutes
90% Phosphoric Acid Boiling 30 minutes
60% Hydrofluoric Acid 20℃ 24 hours
10% Potassium Hydroxide 80℃ 7 Days
Potassium Hydroxide 500℃(Boiling) 24 hours
Sodium Hydroxide 500℃(Boiling) 24 hours
Sodium Carbonate 900℃(Boiling) 24 hours
Sodium Sulfate 1000℃(Boiling) 24 hours
Potassium Fluoride 90℃(Boiling) 4 hours ×
  • ◎:No Corrosion
  • 〇:Slight Corrosion
  • △:Moderate Corrosion
  • ×:Heavy Corrosion

  • When tightening ceramic screws, use a torque
    driver or torque wrench and do not exceed the
    torsional torque.The recommended torque is
    50% of the torsional torque.
M Torsional Torque (N・m)
M3 0.04
M4 0.05
M5 0.10
M6 0.15
M8 0.30
M10 0.50
  • Values in chart are for reference only. They are not guaranteed values.
  • Heat resistance and chemical resistance change
    with performance conditions. Always carry out
    tests under performance conditions similar to
    actual conditions in advance.
  • Ceramic screws may be damaged by impact.
    Take care when handling these screws.
  • Also, ceramics screws with special
    specifications such as ventilation holes,
    dimensions, shapes, and cleanroom washing
    are available. Please contact us for details.
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