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Maximum Torque Values

Ceramco has established (maximum) service torque values for customers whose application(s) may be dependent on specific torque or preload requirements

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Solid Ceramic

Slotted Flat Head Machine Screws & Bolts - U.S. Inch  | → Metric

stock ceramic flat head slotted fasteners – U.S. InchU.S. inch flat head slotted solid ceramic bolts and machine screws are fully threaded. Our solid ceramic fasteners are produced under ISO 9001-2015 compliance and ideally suited for high purity vacuum environments. Non-outgassing, unreactive and inert to 2200° C.

Made in the United States. Large inventory of fasteners. Immediate availability.

No Free Samples

*Available sizes, compositions and lengths vary and may be dependent upon material properties and performance characteristics. Please check our website for the most up-to-date information.

Flat head slotted U.S. Inch fastener dimensional reference

To order fasteners:find the correct size, then select the composition you require.

    A B C D
Size Com­posi­tion Head Diam­eter Head Height Slot Width Slot Depth
#0-80 alumina .099 - .119 .035 .016 - .023 .010 - .015
zirconia
#2-56 alumina .147 - .172 .051 .023 - .031 .015 - .023
zirconia
#4-40 alumina .195 - .225 .067 .031 - .039 .020 - .030
zirconia
#5-40 alumina .220 - .252 .075 .035 - .043 .022 - .034
zirconia
#6-32 alumina .244 - .279 .083 .039 - .048 .024 - .038
zirconia
#8-32 alumina .292 - .332 .100 .045 - .054 .029 - .045
zirconia
#10-24 alumina .340 - .385 .116 .050 - .060 .034 - .053
zirconia
#10-32 alumina .340 - .385 .116 .050 - .060 .034 - .053
zirconia
1/4"-20 alumina .452 - .507 .153 .064 - .075 .046 - .070
zirconia
1/4"-28 alumina .452 - .507 .153 .064 - .075 .046 - .070
zirconia
5/16"-18 alumina .568 - .635 .191 .072 - .084 .058 - .088
zirconia
3/8"- 16 alumina .685 - .762 .230 .081 - .094 .070 - .106
zirconia

Dimensions Per ANSI B18.6.3-1972 (R1991)

Important Information -Please Read

Alumina & zirconia (PSZ) fasteners

  1. 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 to 10 threads on any male fastener.
  2. No warranty with respect to torque strength and tensile strength is extended or implied. Ceramic materials are inherently brittle and display catastrophic failure if impacted or stressed beyond material limits.

Heat Resistant Corrosion Resistant Non-conductive Non Out-Gassing

Stock ceramic fasteners from Ceramco, Inc. Specializing in custom ceramic parts of complex geometries. Learn More.

Immediate Assistanceis only a phone call away. If you have any questions or require additional information, please call Ceramco at: +1 (603) 447-2090, Monday - Friday, 8:00 am - 4:30 pm, U.S. Eastern.