Located outside the USA?
Please read this important information on buyer responsibilities.

New!NOW AVAILABLE!

Maximum Torque Values

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

Read the data…

Technical Summary - Stock Ceramic Fasteners

Material Properties

All of Ceramco's stock solid ceramic Metric and U.S. Inch machine screws, bolts, matching hex nuts & flat washers are produced from the same material formulations as are many of our custom ceramic parts, including blends of either YTZP zirconia when toughness and other unique properties are required, or our A998 alumina (aluminum oxide, Al2O3).

Please refer to the chart: "Ceramco's Materials and Their Properties," for specific information on the applicable formulations.

Maximum Torque ValuesNEW!

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

Solid Alumina (A998) Fasteners

Metric - Alumina
Size SCV. Torque (in*Lbf)
M2 x 0.4 0.4
M3 x 0.5 1.0
M4 x 0.7 2.0
M5 x 0.8 4.0
M6 x 1.0 11.0
M8 x 1.25 27.0
U.S. Inch - Alumina
Size SCV. Torque (in*Lbf)
#-80 0.1
#2-56 0.4
#4-40 0.5
#5-40 1.3
#6-32 0.5
#8-32 2.0
#10-24 4.1
#10-32 2.0
1/4"-20 13.5
5/16"-20 25.7
3/8"-20 40.4

Solid YTZP Zirconia Fasteners

Metric - Zirconia
Size SCV. Torque (in*Lbf)
M2 x 0.4 0.5
M3 x 0.5 1.9
M4 x 0.7 5.5
M5 x 0.8 8.4
M6 x 1.0 15.4
M8 x 1.25 38.1
U.S. Inch - Zirconia
Size SCV. Torque (in*Lbf)
#-80 0.2
#2-56 0.6
#4-40 1.2
#5-40 1.8
#6-32 2.1
#8-32 4.2
#10-24 5.8
#10-32 7.5
1/4"-20 12.3
5/16"-20 31.4
3/8"-20 57.0

Materials Strength & Maximum Service Temperature

Please refer to the chart: "Ceramco's Materials and Their Properties," for specific information on the applicable formulations.

Manufacturing & Quality Assurance

Ceramco’s stock, solid ceramic fasteners are 100% molded, using our near-net shaping process, then fired to full density, never machined or fatigued from harsh grinding.

Tolerances on Length

  • Bolts and screws up to 1" (25 mm): ±1/32" (0.8 mm)
  • Bolts and screws 1" (25 mm) or longer: ±1/16" (1.6 mm)

Threads

  • Inspected using a class 2 fastenera
  • Pitch diameter of male threads will not exceed the max allowable according to Class 2
  • Minimum allowable pitch diameter of male threads may be below that of Class 2
  • Conversely for female threads
  • Engaging more than 6-10 threads on any male fastener is not recommended

a Shrink factor variations in processing and stack-up tolerance cannot be controlled on the thread pitch, precluding their checking with a thread guage.

No warranty with respect to torque strength and tensile strength is extended, nor implied. Ceramic materials are inherently brittle and display catastrophic failure mode if impacted, or stressed beyond the material’s limit.

Further testing at Ceramco includes extensive random dimensional verification of samples and the monitoring and documentation of each raw materials batch.

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.