The broadest flat pass — a full inch of flank steadies wide flat work better; that is the 66060.
True crowned and contoured sweeps — a square-tipped straight lifts its notch off a real curve at the tangent; the curved tip (66030) is built for that.
Long convex, clearance-documented pulls and heavy deflashing — the offset (66090) keeps the hand clear and is the catalog-named deflashing knife.
Throughput vent-trimming of production tread rows — the five-groove pin trimmer (65060) clears the swath; the straights take the detail.
And it is not a repair knife — it finishes healthy parts; injured-casing work is the K770 skiver (61350) and the H2T taper point (61260), other lines.
The 11/16" width is a following width — keep the flanks flat and let them ride the surface into modest changes of direction; do not force the blade the way you might a wider one. Never lift the trailing edge. As with every V-trim, raising the back to force the cut drives the notch walls into the surface and gouges it — flat flanks, converging walls doing the shear. Pull the notch along the protrusion, not into it — a running cut that feeds each spew and the flash ridge into the V. Reach for the right size: true crowned contours want the curved tip (66030), broad flat runs want the wide straight (66060), and long convex clearance-documented pulls want the offset (66090) — the 66330 is the standard middle between them. Sharpen the notch on its walls with a slip stone or fine tapered file following the V, burr stropped off the outside face; a flat bench stone used alone rounds the flanks and un-designs the knife (authored trade knowledge; no Hyde maintenance text). The blade is high-carbon; dry it after wet work.
Asked before buying
BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
Is this different from the wide straight, apart from size?
No — and we say so plainly. Between the plain straights it is width, length, and pattern number that differ; the 66330 is the narrower, standard-length one, which follows tighter work more closely.
Why is it called "3787A"?
It is the pattern number a plant orders by — a shape and a promise of sameness across reorders. Its origin is undocumented ; we treat it as an identifier, not a story.
When do I want the narrower blade?
Closer quarters and tighter changes of direction, where a full inch of flank would bridge or crowd. For true crowned contours, step to the curved tip (66030).
Is it the right general-purpose straight?
For a bench that keeps one straight V-trim and orders it by a number, very often yes — it is the standard middle of the line.
Can it deflash molded parts?
Yes, at ordinary bench scale. The catalog-named deflashing knife is the offset 66090; heavy or long-pull deflashing goes to it.
How do I sharpen the notch?
On its inside walls with a slip stone or tapered file following the V, burr off the outside face; never a flat bench stone alone . Dry the carbon blade after wet work.
