Oracle 7.3.3 on NT loader problem...

I have been using it with great luck over the last 3 days, except for 1 table:

Here is the schema:

create table arcclass (
partnumber varchar(20) primary key,
sizein varchar(10),
sizemm varchar(10),
drilldiain number,
drilldiamm number,
rodsize varchar(10),
ploadlb number,
ploadkn number);

here is a sample of the data that I trying to load:

ARC-25-175-RH25|1/4" x 13/4"|6 x 44|0.1875|5|1/4"-20|500|2.3|
ARC-31-200-RH37|5/16" x 2"|8 x 51|0.25|6|3/8"-16|500|2.3|
ARC-31-200-SW37|5/16" x 2"|8 x 51|0.25|6|3/8"-16|500|2.3|
ARR-T|Standard Rapid Rod Tool|||||||||
ASW-T|Sidewinder Tool||||

the laoder insists that the number columns are not correctly formed numbers, and the load fails.