Is B69 thread thick enough for use attaching bag handles?

[kgg]

11 hours ago, AlZilla said:

As a practical matter, I believe the strap is going to stay safely on the lady's handbag.

I do agree.

8 hours ago, AEBL said:

I'm seeing how much of an engineering problem this is ... and I'm liking it more. Makes me want to set up some stitch samples and a set of weights and take some failure data. I'm sure it also depends on tannage and thickness somewhat.

To name a few variables the results will depend on:

i) leather type and thickness, chrome vs veg tan

ii) thread size

iii) thread type, nylon, polyester, etc

iv) needle size and tip shape

v) stitches per inch

vi) stitch patterns

About a month or so ago I got a new metal lathe, We had to move the wooden crate from the driveway to the rear of the house about a 60 foot or so move. We used my little 25 hp tractor using chains wrapped around the crate and hooked to the bucket hooks. No problem and in the basement we used a 1 ton shop hoist, 600 lb capacity hydraulic table and a combination of 2" and 3" nylon lifting straps. I always use backup straps as a just in case. One of the lifting strap on the last lift failed at the seam stitching of one of the end loops. It took the weight initially then went off like a gun glad we had the backup straps on or it could have been a bad day.

kgg

[MarlinDave]

Similar question. Brother in law has a firewood carrier, synthetic eth web handles. Wants it remade with leather. Making it out of chrome tan, gonna contact cement and stich carry straps with 138. Do I need to add rivets too? Figure it will carry 50 to 60 lbs firewood. 

[AlZilla]

8 hours ago, MarlinDave said:

Similar question. Brother in law has a firewood carrier, synthetic eth web handles. Wants it remade with leather. Making it out of chrome tan, gonna contact cement and stich carry straps with 138. Do I need to add rivets too? Figure it will carry 50 to 60 lbs firewood. 

As above, do the math. An X or W pattern helps add stitches, if you need them.

I made mine from pig suede. I wrapped webbing all the way around and sewed it with v138. I used maybe 1.75 inch webbing. Essentially, the webbing carries all the weight anyway.

[AEBL]

@MarlinDave, like AlZilla said, for sure, do the math ... size your stitched area for ~ 50% more weight than you figure the maximum weight it should carry (a "safety factor").

@kgg, glad you had backup! I suppose another variable is "shock loading"