Bayonet Cap (B22) Electrical Lamp Socket Component
Electrical Accessory / Hardware · Unknown Industrial Manufacturer; generic electrical hardware
Pattern: Standard B22/Bayonet Style Lighting Hardware
Type
Electrical Accessory / Hardware
Maker
Unknown Industrial Manufacturer; generic electrical hardware
Material
Nickel-plated brass or aluminum base metal; contains no silver content. The 'silver' appearance is a result of plating or the natural color of non-precious metals used in electrical components.
Dimensions
Standard size approx 3-4 cm in height; estimated weight 15-25 grams.
Description
This is a utilitarian electrical part, specifically the outer shell of a bayonet-style light bulb socket. It is not an antique silver item or fine metalwork. It is designed to hold a light bulb in place using a push-and-twist mechanism common in many parts of the world outside North America.
Key Features
Dual J-shaped slots for pin engagement; exterior threading for shade attachment; non-precious metal construction.
Material & Composition
Nickel-plated brass or aluminum base metal; contains no silver content. The 'silver' appearance is a result of plating or the natural color of non-precious metals used in electrical components.
Finish & Decoration
Dull industrial metallic finish with heavy oxidation and mineral deposits. Features functional threading and a knurled ring for grip during assembly.
Hallmarks & Stamps
None visible; typically these items bear voltage/wattage ratings rather than silver hallmarks.
Construction Details
Machine-stamped and threaded industrial component; cylindrical form with J-slot cutouts for bayonet pins.
Functional Features
J-slot bayonet mount for bulb retention, external threads for a shade-retaining ring, and a hollow core for wiring.
Handle & Grip Details
Knurled gripping surface on the collar for manual tightening.
Craftsmanship Details
Mass-produced machine quality; functional and industrial rather than artisanal or decorative.
Authentication Indicators
Lack of hallmarks, presence of mechanical threading, and industrial J-slot design prove this is electrical hardware, not silver.
Origin & Manufacturing
Mass-produced in various countries including the UK, India, and China, following international IEC standards.
Era & Period
Mid-20th Century to Modern industrial era (c. 1950-present).
Age Estimate
Circa 1970-2000 based on the degree of surface corrosion and modern mechanical threading.
Cultural Significance
Represents the standardization of domestic electrical lighting in the 20th century.
Condition Notes
Poor/Salvage condition. Significant corrosion, surface pitting, and dirt accumulation. Functional threads appear worn.
Value Estimate
Negligible/No silver value. Scrap metal value only.
Care & Maintenance
Not applicable for silver enthusiasts; if repurposed for use, it must be cleaned of corrosion to ensure electrical conductivity and safety.
Similar Pieces
Edison Screw (E27) bulb holders, which utilize a continuous thread rather than a bayonet pin system.
Interesting Facts
The Bayonet Cap (B22) was originally developed by Joseph Swan for use with early incandescent bulbs and became the standard in Britain and its former colonies.