Description
Two clear cards that read the thread pitch on Heavy Hex studs and nuts, one inch and one metric, plus a Heavy Hex size chart. This is the Heavy Hex Clear Card Thread Checker shown in my book, The Bolting Field Technician's Pocket Reference.
Two ways to read the pitch
Peel off the protective film first, so you can see through the card.
Hold it against the threads. Slide the card along until one row of arrows lines up with every thread crest. The number at the end of that row is the pitch. The marks run off the edge of the card, so it works on an installed nut with only a few threads showing.
Take a pencil rubbing. Lay paper over the threads, rub lightly with a pencil, and match the rubbing to a row of arrows. On a stud behind a flange or inside a nut, where a metal thread gauge won't fit, this still works.
What's in the package
- Clear Card Thread Checker, inch: 4, 4-1/2, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16 and 18 threads per inch
- Clear Card Thread Checker, metric heavy hex pitch in mm
- Heavy Hex size and pitch chart: studs 5/8" to 4", nuts 1-1/16" to 6-1/8", 8 UN, UNC and UNF
- Instruction card, and a vinyl sleeve for each card
For millwrights, bolting technicians and pipefitters on flanges, heat exchangers and turbines.
More detail on the Heavy Hex clear card set page. Want the whole kit? See the Heavy Hex Pocket Cards.
