I bought a Teco set recently (BP size) that seems pretty decent and better
finished than the "quality" import bought from J&L about 8 years ago. It
was around $100 from Enco, I think. I'm not sure what the consensus opinion
is, but try to get a set that has the holes on the bottoms of the T-nuts
closed a bit so that the studs can't be rotated through them to the press
against the bottom of the T-slots on your table. The T-nuts are cheap
enough to replace if you get a decent clamp set with through threaded
I just got a Millrite (from Steve Smith, who lives 3.5 hours north of
One thing I have discovered is that the three T-slots are not exactly
the same size, and that they differ slightly from current sizes. I
assume that the Millrite was made to the then standard for T-slots, and
that the T-slot standard has since changed.
The throats of the slots are all 0.6865" minimum width, which is
nominally 5/8". Half-inch hardware will fit, but doesn't spread the
clamping load as widely as it should. Anyway, the slots are quite
consistent, as is the height of the undercut part (0.403"), the big
difference being in the width of the undercut part. The three widths
are 1.157", 1.162", and 1.132".
Another, minor issue is the burr that forms at the underside corner of
the slot, narrowing that slot. The solution is to remove this burr with
Anyway, I've had no problem with current 5/8-inch "T-Slot Bolts" (with
the forged heads), but I've had to cut down some 5/8-inch "T-Bolts" and
metric M16 by 18mm "T-Slot Nuts" to fit. These are MSC catalog numbers
01841832, 77416337, and 03789575, on big-book pages 1073 to 1075.
By current T-slot standards, the M16 T-slot nut should have fit, but I
had to thin the slot part by 0.005" on each face, and remove the slot
It's easy to mill these nuts and bolts down to size on the Millrite,
using a HSS mill and black sulfurized cutting oil, as the steel is
tempered for toughness, not hardness.
Years ago when I had my mill drill it had 9/16 slots and I bought a cheepie
import set from ENCO for about $30 and wasn't disappointed at all. FWIW
they were 1/2-13 and even had the 'damaged' thread on the bottoms so you
couldn't screw through them. A year ago when I bought the BP I made my own
nuts from scrap kicking around.... I'm still using the same set...