11-22-2019, 09:34 AM
Ok, it turns out that Sav-A-Thread products are similar but different than Time-Serts and Keen-Serts. Made by Emhart (owner of Heli-Coil trademark, which is now owned by Stanley-Black & Decker).
See attachments.
Sav-A-Thread inserts appear to come in three flavors.
1. Regular ol' wound-wire heli-coils (they say to NOT use them on taper-seat plugs).
2. For taper-seat spark plugs, the insert is solid (not wound wire like a heli-coil) but uses knurled threads at the top, along with some sort of peening tool to lock it in. Um, other than avoiding a Time-Sert patent(?), I have no idea why they'd go that way.
3. For general thread repair, the other type of Sav-A-Thread inserts seem to be VERY similar to Keen-Serts, except with only one locking key (they call it a peg) and the top of the key breaks off once the peg is hammered into position. Hmmm....
See attachments.
Sav-A-Thread inserts appear to come in three flavors.
1. Regular ol' wound-wire heli-coils (they say to NOT use them on taper-seat plugs).
2. For taper-seat spark plugs, the insert is solid (not wound wire like a heli-coil) but uses knurled threads at the top, along with some sort of peening tool to lock it in. Um, other than avoiding a Time-Sert patent(?), I have no idea why they'd go that way.
3. For general thread repair, the other type of Sav-A-Thread inserts seem to be VERY similar to Keen-Serts, except with only one locking key (they call it a peg) and the top of the key breaks off once the peg is hammered into position. Hmmm....