TE Connectivity / Kemtron Jam Nut Seals

TE Connectivity's (TE) Kemtron Jam Nut Seals are O-rings designed to shield against radio frequency interference (RFI) and electromagnetic interference (EMI). These seals are compression molded as one solid piece, eliminating the process of joining the two ends together like vulcanized-joined O-rings. The jam nut seal material is available in four options: silicone nickel graphite, fluorosilicone nickel graphite, silicone silver aluminum, and fluorosilicone silver aluminum. TE Kemtron Jam Nut Seals are compliant with MIL-DTL-38999 and MIL-DTL-26482 and operate in a temperature range of -55°C to +160°C.


  • Shields against RFI and EMI
  • Compression molded as one solid piece
  • No joined pieces
  • Wide variety of shell sizes
  • Compliant with MIL-DTL-38999 and MIL-DTL-26482
  • Material
    • Silicone nickel graphite
    • Fluorosilicone nickel graphite
    • Silicone silver aluminum
    • Fluorosilicone silver aluminum


  • Inside diameter (ID) tolerance
    • <38.1mm ±0.25mm
    • 38.1mm to 50.8mm ±0.38mm
  • Cross-section diameter (CS) tolerance
    • 1.8mm ±0.1mm
    • 2.6mm ±0.13mm
  • Molded tolerances
    • Maximum tooling mismatch: 0.08mm
    • Flash and parting line projection
    • Maximum thickness: 0.15mm
    • Maximum protrusion: 0.15mm
  • -55°C to +160°C operating temperature range

Choice of Material

TE Connectivity / Kemtron Jam Nut Seals
Published: 2023-02-14 | Updated: 2023-02-24