U25A Stop Countersinks
In stock
SKU
U25A
Stop countersinks 100°
for American-pattern cages.
Integral pilot. Three flutes. M42 8% Cobalt HSS. 1/4-28 UN threaded mount.
100° included angle Concentrically relief ground. (3/8-24 UN for body diameters >5/8")
*Code numbers in brackets are the makers' numbers for the same tool in 2 FLUTE configuration,
which is sometimes advised for free-cutting aluminium work. The 3 FLUTE tools we offer have
excellent performance on steels, including tough stainless, and titanium but are also well suited
to most aerospace light alloys, and therefore we do not currently stock 2-Flute pattern. However,
the two flute type, if insisted, may be provided on demand.
We can provide to special order tools with
- Non-standard pilot diameters · - Carbide tips
- 82° 90° 110° and 120° included angles | Pilot diameter | 3/32 |
|---|---|
| Thread UN | 1/4-28 |
| Equivalent Numbers Martin* | MM305A-0 |
| Equivalent Numbers Zephyr* | ZT170-12 |