mystery bolt

[TractorGuy]

I sure thought grade 8 bolt has 6 radial dashes on the top of it's head

Yes, 6. . . . And assuming its metric - none of the above. On metric youll see 5.5, 8.8, 10.9, or 12.9. 12.9 is stronger than Gr8.

Yep I had a brain fart.

 

[the old grind]

The OP said: "It is definitely metric and I don't have a metric thread gauge."

With all the discussion and only one pic I missed what the head markings are, if ever actually reported.

OP's last post was #11. We've all been just guessing with no more that the one pic in post #4.

Myabe he did leave. :confused3:

 

[hawkeye08]

OP should not only look for a missing bolt on his tractor, he should check all the bolts to make sure they are tight.. seems more than one person has had loose bolts.

 

[Big Barn]

Someone should head over to his place and scatter a few more miscellaneous bolts on his driveway. At least one British Whitworth for good measure.

 

[grsthegreat]

Someone should head over to his place and scatter a few more miscellaneous bolts on his driveway. At least one British Whitworth for good measure.

Now that sounds like fun.......

 

[aczlan]

Someone should head over to his place and scatter a few more miscellaneous bolts on his driveway. At least one British Whitworth for good measure.

As someone who has a set of Whitworth sockets (due to a hydraulic pump that had of Whitworth and SAE bolts), that would be entertaining.

Aaron Z

 

[SPYDERLK]

As someone who has a set of Whitworth sockets (due to a hydraulic pump that had of Whitworth and SAE bolts), that would be entertaining.

Aaron Z

Wouldnt an English-Metric set cover Whitworth with small enuf gaps?

 

[the old grind]

Those '60s Brit bikes were full of Whitworth stuff. Wrench openings were non-standard, and it seems like everything was 26 TPI from 1/4" (rocker boxes) to >1" axles. It's not like everyone doesn't have 21/32" and 25/32" spanners.

btw, drill bits come in 'number' and 'letter' sizes, providing < 1/2" increments finer than in 64ths. .003" - .004" size steps and without a quality sharpen most any one you grab will drill that much o'size, esp in a hand-held chuck.

 

[aczlan]

Wouldnt an English-Metric set cover Whitworth with small enuf gaps?

Nope, the bolt in question had a 13.5mm head, too small for a 14mm or 9/16" to fit. Too big for a 13mm or 1/2" to fit.

Aaron Z

 

[bcp]

I was given some open end wrenches. I found that they had been ground oversize. Someone must have worked on Whitworth stuff.

Bruce