| Tap and Die Sizes for Indian Threaded Parts |
| Motor Parts | Model | Special | Size |
| Timing Inspection Plug | All | Yes | 3/4"-24 |
| Tappet Adjusting Bolt & Nut | All | Yes | 9/32"-32 |
| Lower Timing/Sump Plugs | All | No | 1/8" NPT-27 |
| Motor Sprocket Nut | Chief | Yes | 5/8"-24 |
| Crank Shaft (Rod) Nuts | Chief | Yes | 3/4"-24 |
| Flywheel Shaft Nuts (Pinion/Drive @ Flywheel) | Chief | Yes | 5/8"-24 |
| Pinion Gear Nut (Left Hand Thread) | Chief | Yes | 3/8"-24L |
| Cylinder Studs | All | No | 3/8"-24 |
| Oil Pump Gear (On Cam) | All | No | 7/16"-20 |
| Oil Pump/Sump Elbow Jamb Nuts | All | Yes | 7/16"-24 |
| | | | |
| Primary Drive | | | |
| Chain Inspection/Filler Plugs | All | Yes | 3/4"-24 |
| Bottom Drain Plug | All | No | 1/8" NPT-27 |
| Clutch Arm Nut (On Worm) | All | Yes | 1/2"-24 |
| Lower Rear Primary Bolt (Into Transmission) | Chief | No | 1/4"-20 |
| Clutch Pressure Plate Nuts | All | No | 5/16"-24 |
| Clutch Driver Hub (Left Hand Thread) | All | Yes | 5/8"-24L |
| | | | |
| Linkert/Schebler Carburator Parts | | | |
| Parts Diagram | Linkert | No | Here |
| Float Bowl to Body Nut | All Linkert | Yes | 3/4"-20 |
| Needle Seat to Bowl | All Linkert | No | 7/16"-20 |
| Needle Seat to Bowl | Schebler | Yes | 13/32"-24 |
| Needle Seat to Bowl (Shouldered Bowl Models Only) | Schebler | Yes | 3/8"-24 |
| Fuel Line to Needle/Seat | All Linkert | Yes | 7/16"-27 |
| Fuel Line to Petcock | All L/S | Yes | 7/16"-24 |
| Butterfly Retaining Screws | All | No | #6-32 |
| Idle/Hi Speed Adjusting Needles | All Linkert | Yes | 1/4"-40 |
| Idle Passage Plug & Fixed Jets | All | No | #8-32 |
| Manifold Screws (Counter Sunk Oval Head) | All Linkert | No | 5/16"-18 |
| Air Cleaner Screws (Fillister) | All Linkert | No | #12-24 |
| Air Cleaner Screws (Air Horn) | Schebler | No | #10-24 |
| Bowl Top Plug (Over Needle & Seat) | All Linkert | Yes | |
| Bowl Top Plug (Over Needle & Seat) | Schebler | Yes | 9/16"-24 |
| Float Pivot & Drain Plug | All Linkert | No | 1/4"-32 |
| Idle Body Plug | All Linkert | Yes | 5/16"-32 |
| Idle Body Plug | Schebler | Yes | 5/16"-24 |
| | | | |
| Transmission Parts | | | |
| Bottom Drain Plug | All | No | 1/8" NPT-27 |
| Transmission To Engine | Chief | No | 7/16"-14 |
| Tower Bolts | Chief | No | 1/4"-20 |
| Clutch Sprocket Nut (Inside Transmission) | All | Yes | 1-3/8"-24 |
| Drive Sprocket Nut | All | Yes | 1-3/16"-24 |
| Kick Gear Nut (On Trans Mainshaft) | All | Yes | 1/2"-24 |
| Bellcrank Nut (Shift Arm On Tower) | Chief | No | 3/8"-24 |
| | | | |
| Chassis Parts | | | |
| Grease Zerk Fittings | All | Yes | 5/16"-32 |
| Shock Cover Set Screw | Chief | No | #10-32 |
| Rocker Clutch Pedal Castle Nut | All | No | 1/2"-20 |
| Front Motor Mount Nut | Chief | No | 5/8"-18 |
| Handlebar Control Sleeve Nuts | All | Yes | 1-3/8"-24 |
| Fuel Tank Oil Fittings (At Tank) | All | No | 1/4" NPT |
| Fuel Shutoff Valve (At Tank) | All | No | 1/8" NPT-27 |
| Brake Pedal Pivot Bolt (Pre 40) | Chief | Yes | 1/2"-24 |
| Brake Pedal Pivot bolt (40-53) | Chief | No | 9/16"-18 |
| Brake Rod Pivot (Shoulder Bolt At Frame) | Chief | No | 7/16"-20 |
| Tank Emblem Screws | Chief | No | #2-56 |
| Shock Nuts (Top & Bottom of shaft) | Chief | Yes | 5/8"-24 |
| Shock Nuts (top & bottom of shaft) | Scout | No | 7/16"-20 |
| Chief Main Motor Mount Bolt | Chief | No | 5/8"-18 |
| | | | |
| Fork Parts | | | |
| Fork Stem (Leaf Fork) | Chief | Yes | 1-1/8"-24 |
| Fork Stem (Girder & Telo) | Chief | Yes | 15/16"-24 |
| Girder Chief Link Nuts | Chief | No | 7/16"-20 |
| Scout Fork Link Rod Nuts | Scout | No | 1/2"-20 |
| Leaf Spring Rocker Nuts (Originals Pre 1940) | Chief | Yes | 1/2"-24 |
| Leaf Spring Rocker Nuts (Originals 1940 & Later) | Chief | No | 1/2"-20 |
| | | | |
| Electrical Parts | | | |
| Generator Drive Pulley Nut (at primary) | All | No | 5/16"-24 |
| Generator Drive Pulley Nut (at generator) | All | No | 7/16"-20 |
| Adjustable Point Contact & Nut | All | Yes | 3.5x.6 mm |
| | | | |
| Wheels & Hubs(see Offset in "Misc Data") | | | |
| Front Axle Nut (Girder & Telo Models) | Chief | No | 5/8"-18 |
| Front Axle Nut (Leaf Models) | Chief | No | 9/16"-18 |
| Rear Axle Nut | Chief | No | 9/16"-18 |
| Rear Brake Drum Brg Nut (37-53) Left Hand Thread | Chief | Yes | |
| Front Brake Drum Brg Nut (37-45) Left Hand Thread | Chief | Yes | |
| Front Brake Drum Brg Nut (46-53) Right Thread | Chief | Yes | |
| Front Hub To Drum Lugs 46-53 | Chief | No | 5/16"-24 |
| Rear Hub To Drum Lugs 37-45 (also Front for 37-45) | Chief | No | 3/8"-24 |
| Rear Hub To Drum (Studs & Internal Hex Nuts) 46-53 | Chief | No | 5/16"-18/24 |
| Rear Hollow Axle Nut | Chief | Yes | 7/8"-24 |
| Front Brake Adjuster & Lock Nut (35-53) | All | Yes | 1/4"-24 |
| Anything over 3/4", is marked as "Special Thread" | | | |
