New BSA Unit Twins "Hollow" Swing Arm Spindle Shaft. If your in need of a New Swinging Arm Spindle then this is exactly what you need! Comes with a lovely Zinc Plated finish! Measures 10" 12/16" including the side plate with a thread pitch of 20 TPI! Fits all BSA Unit Twins (Lighting, Royal Star, Hornet, Thunderbolt, Spitfire, Etc) from 1962-1968 only. Also fits many A & B Group BSA Pre-Unit Twins & Singles that feature the "Cross Over" Rear Brake with the Ariel Style Hubs up to 1963! Please refer to your parts catalog for proper fitment.
*****Please note that this Swing Arm Spindle may fit other BSA models that are not represented abouve! Always check your parts book!*****
•O.E.M Part number is 42-4340