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15 April 2008   

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Screw Thread forms used on Austin Sevens

The following information has been obtained from a 1932 LWB Box Saloon, variations may have been used by Austin during the production history of the Seven. We would appreciate information on any variations found in order to be able to maintain this information as accurately as possible. Please Email us with any additional information.

SIZE

TYPE

TPI

USE

1/4

BSF

26

General Bolts and Setscrews. Engine/ Manifold Studs.

5/16

BSF

22

General Bolts and Setscrews. Engine/ Cylinder Head and Gearbox Studs. Shock Absorber Link Bolts

3/8

BSF

20

Bolts and Setscrews . Wheel Studs. Shock Absorber Link Bolts. Dynamo Spindle Com End. Springs "U" Bolts.

7/16

BSF

18

Dynamo Spindle/Castle Nut. Front Brake Shoe Pivot Pin.

1/2

BSF

16

Steering Swivel Axle/Cross Tube Levers. Brake Pedal Fulcrum Pin. Rear Spring Through Bolts.

1/4

BSW

20

Oil Sump Bolts.

5/16

BSW

18

Studs Crankcase/Bell-housing. Oversize Sump Bolts.

3/8

BSW

16

Studs Bell-housing (Stepped Oversize).

2

BA

31.4

Fittings. Door Hinges Mounting ("A" Post).

3/4

SPECIAL

14

Drain Plugs Gearbox/ Engine/Back Axle and Gearbox Filler Plug.

3/4

BSC ?

20

Steering Cross Tube and Jaws. Plug Top of King Pins.

5/8

SPECIAL

16

Axle Shafts / Radius Arms/Crankshaft (front)

7/8 SPECIAL 12

Crankshaft (rear)

1–1/4

SPECIAL

16

Rear Hub Bearing Retaining Nut. Torque Tube Socket. Screw Cores Engine Block.

1–3/8

SPECIAL

16

Hubs.

3/4

BSC/BSB

26

Gearbox Speedometer Drive Bush and Cable Ends.

3/8

BSC

26

Front and Rear Shock Absorbers Centre Bolt.

7/16

BSC

26

Headlamp Mounting Bolts/Nuts.

1/2

BSC

26

Starter Motor Spindle/Nut. Replacement Front Shock Absorber Centre Bolts.

1/8

BSP

28

Shackle Repair. Grease Plug Hole-Hubs. Grease Nipples Fitting Holes.

1/4

BSP

19

Pipe/Fittings. Brake Rope Guides. Rear Axle Filler Plug. Rear Axle Breather Pipe. Petrol Pipes Unions.

3/8

BSP

19

Speedometer Drive Bush Gearbox.

The following abbreviations have been used.

BA = British Association

BSP = British Standard Pipe

BSB = British Standard Brass

BSW = British Standard Whitworth

BSC = British Standard Cycle

SPECIAL = Whitworth Form Special

BSF = British Standard Fine

TPI = Threads Per Inch

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