When one of the two parallel lugs are offset, one higher than the other one, the base is named BAY15D (1157) PREFOCUS double contact bayonet base. The BA15d base has TWO contacts on the bottom and two parallel lugs on opposing sides of the base 180 degrees apart.

Choose from our selection of BA15d base light bulbs, including over 60 products in a wide range of styles and sizes. Same and Next Day Delivery.

10W BA15D LED Light Bulb (100W Halogen Equivalent), Warm White 3000K, AC110V, BA15D Double Contact Bayonet Base, Dimmable, BA15D Ceramic LED Corn Light Bulbs, 4 Pack

BA15d miniature lamps have a 15mm diameter base with two contacts and two in-line side lugs that twist and lock into a BA15d-compatible socket. They are commonly used in beacons, stack lights, and vehicles.

Double contact bayonet base, often used in display cabinets, exit signs, gallery lighting, and more. The twist and lock style bayonet light bulb mount was first developed in the UK in the 1860s.

BAZ15D vs BAY15D (bay15d vs baz15d): BAZ15D and BAY15D bases both measure 15mm in diameter, boast dual contact points at the bottom, and feature side pins that aren't parallel; with BAY15D's being 180 degrees apart versus 150 for BAZ15D. See image below.

Ba15d Sewing Machine LED Light 5 Watt Bulb, Double Contact Bayonet Base, T3/T4/C7/S6 Halogen Replacement Bulb, AC100V-240V, Daylight White 6000K, 50W Equivalent, Non-dimmable (Pack of 2). Only 13 left in stock - order soon.

At Bulbs.com you can purchase at least 15 different Incandescent Light Bulbs with a Double Contact Bayonet (BA15d) Base from brands like CEC Industries and Bulbrite.

BA15D Led Light Bulbs 120V Dimmable 7W Double Contact Bayonet Base, 75W JD Type T3/T4 Halogen Equivalent, BA15D LED Bulb 3000K Soft Warm White for Sewing Machine Pendants Wall Light

The WEST MARINE Double Contact Bayonet BA15D-1142 LED Bulb has been designed as a replacement and upgrade for standard halogen, Xenon and incandescent filament bulbs, offering dramatically lower power consumption and heat generation, while having much greater lifetime and shock resistance.