Solid Ceramic Fasteners


Socket Cap Head Machine Screws & BoltsMetric  |  U.S. Inch

stock ceramic Cap Socket Head fasteners - MetricCap socket head metric alumina and zirconia bolts and machine screws, as with all our ceramic fasteners, are chemical resistant, thermal resistant, non-outgassing, and withstand constant high temperature exposure.

To Order Fasteners:
  1. Find the correct Size
  2. Click-on the Composition you require
  3. Available lengths displayed on next page
Socket cap head Metric fastener dimensional reference

Available sizes, compositions and lengths vary and may be dependent upon material properties and performance characteristics.

    A B C
Size Composition Head Diameter Head Height Hexagon
Size Nom.
M2 x 0.4 alumina 3.65 - 3.8 1.91 - 2.0 1.5
M3 x 0.5 alumina 5.32 - 5.50 2.89 - 3.0 2.5
M4 x 0.7 alumina 6.8 - 7.0 3.88 - 4.0 3.0
M5 x 0.8 alumina 8.27 - 8.5 4.86 - 5.0 4.0
M6 x 1.0 alumina 9.74 - 10.0 5.85 - 6.0 5.0
M8 x 1.25 alumina 12.70 - 13.0 7.83 - 8.0 6.0

Dimensions Per ANSI B18.3.1M-1986 (R2008)

Material Properties Which is the best choice for your application?

Torque Values for applications dependent on specific torque or preload requirements.

Threads The pitch diameter of male threads will not exceed the max allowable according to Class 2. Minimum allowable pitch diameter may be below that of Class 2, conversely for female threads.

Due to shrink factor variances, the stack up tolerance cannot be controlled on the pitch. It is recommended that you not engage more than 5 threads on any male fastener.

Notice Ceramic materials are inherently brittle and display catastrophic failure if impacted or stressed beyond material limits.

Immediate Assistance is only a phone call away. Have questions or require additional information? Please call Ceramco at: +1 (603) 447-2090, Monday - Friday, 8:00 am - 4:30 pm, U.S. Eastern.

Same Day Shipping. Online orders received before noon U.S. Eastern Time (M-F) ship same day.