Bolts holding Starter Switch

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SavannahDog
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Joined: Wed Feb 01, 2017 5:05 pm

Bolts holding Starter Switch

Post by SavannahDog » Sat Jan 11, 2020 11:40 am

Hi, I,m trying to understand the bolt size holding the Starter Switch. 2BA is too large. Buy the way whats BA stand for anyway.
Julian Carter
1948 MG TC
1952 Chevy Pickup
1967 Triumph TR4A
1970 Triumph GT6

SavannahDog
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Re: Bolts holding Starter Switch

Post by SavannahDog » Sun Jan 12, 2020 10:13 pm

BA stands for British fastening before witworth.. Managed to purchase some 00, and 01 both from BA Bolts in England.
Julian Carter
1948 MG TC
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1967 Triumph TR4A
1970 Triumph GT6

frenchblatter
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Re: Bolts holding Starter Switch

Post by frenchblatter » Mon Jan 13, 2020 1:10 am

BA stands for British Association. See here https://en.wikipedia.org/wiki/British_A ... ew_threads
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Steve Simmons
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Re: Bolts holding Starter Switch

Post by Steve Simmons » Mon Jan 13, 2020 9:06 am

I believe the screws are 4BA, 1/4" long.
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ROGER FURNEAUX
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Re: Bolts holding Starter Switch

Post by ROGER FURNEAUX » Wed Jan 15, 2020 3:38 pm

They are indeed 4BA, with slotted hexagon heads. Originally they had little tab washers with an ear bent up to stop them loosening. I know this because I have an unused ST1 switch in its Lucas box, with a little packet of screws & tabs.
The thing about BA is they were not originally British at all, but a Swiss Metric watchmakers thread! Because of this, 0BA, the largest, is exactly the same diameter & pitch as M6.

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SavannahDog
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Re: Bolts holding Starter Switch

Post by SavannahDog » Thu Jan 16, 2020 7:14 am

OK I've bought 2BA bolts and their too big. Maybe my starter is not original but I ordered 2 and 1. Well see when they get here.
Julian Carter
1948 MG TC
1952 Chevy Pickup
1967 Triumph TR4A
1970 Triumph GT6

SavannahDog
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Re: Bolts holding Starter Switch

Post by SavannahDog » Tue Jan 21, 2020 12:20 pm

Well My BA 1 and 0 were too big. And this proves it https://en.wikipedia.org/wiki/British_A ... rew_thread

I'll try American sizes.
Julian Carter
1948 MG TC
1952 Chevy Pickup
1967 Triumph TR4A
1970 Triumph GT6

ROGER FURNEAUX
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Re: Bolts holding Starter Switch

Post by ROGER FURNEAUX » Wed Jan 22, 2020 12:50 pm

Julian, did you not read my reply on 15th. January? If you canot find them in the States, I have them here in Olde England.

Roger

SavannahDog
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Re: Bolts holding Starter Switch

Post by SavannahDog » Thu Jan 23, 2020 5:11 am

Roger, Sure could use them. Thought I could buy what I needed. But I'm failing at that.

If you could Please send me 2 two of the screws.

Julian Carter
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Julian Carter
1948 MG TC
1952 Chevy Pickup
1967 Triumph TR4A
1970 Triumph GT6

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