GEM manufactures a wide range of lead-in-wire types to satisfy the requirements of the lighting and related industries. The function of lead-in-wire in electric lamps is to provide an electric connection to the filament along with a glass-to-metal seal component. Wherever necessary, a built in fuse link is also available within a lead-in-wire pair. The lead-in-wire types manufactured covers a wide range of dimensions and materials to suit the many applications and lamp types.

The lead-in-wires are made by Percussion Electric or Gas Welding techniques, depending upon the volume and the materials.

Lead-in-Wire Type Typical Application
2 Part For Compact Fluorescent Lamps (CFL),
Neon Indication, and
Glow Lamps
3 Part For Standard Fluorescent Lamps (FTL),
General Lighting Service Lamps (GLS),
Compact Fluorescent Lamps (CFL)
Auto lamps
HID lamps
4 Part Specially Joined High Wattage lamps,
Discharge lamps

Within each category there are many standard types, which cover the majority of lighting industry requirements, and these are summarized in the following data sheet. Requirements outside these standard dimensions and materials can also be made available.

Broad Specifications

  A (Inner Lead) B (Press or Seal) C (Outer Lead)
Standard materials available*
(*Other materials available by request)
Pure Nickel
Nickel Mn
Nickel Plated Steel (NPS)
FeNi 48
Nickel Plated Copper (NPC)
Nickel Plated Copper Tin (NPCuSn)
CCS (30% or 40% IACS)
Nickel-Copper (Ni67 Cu 33)
CuSn (Bronze)
Temper / Finish Hard / Soft Borated / Oxidised Hard / Soft
Standard Diameters (mm) 0.4 - 2.5 mm 0.3 - 0.6 mm
0.16 - 0.8 mm
Diameter Tolerance (±mm) ± 2% ± 1% ± 2%
Normal Available Lengths (mm) 6 - 75 mm 3 - 15 mm 12 - 100 mm
Length Tolerance (±mm) ± 0.25mm ± 0.25mm ± 0.25mm
Overall Length (±mm) ± 0.50mm
Packaging Divided flat packs, plastic tubes or as per customer specification.
Quality Supplied to agreed specifications to be provided by the customer or as per our own specification.
Lead in wires for lamps Lead in wires for lamps Lead in wires for lamps