YG1 Machine Reamer Set HSS-Co H7 Chucking 6-16mm UAE
YG1 Machine Reamer Set — HSS-Co, H7 Tolerance, DIN 212 Chucking
Six-piece chucking reamer set for finishing pre-drilled holes to H7 bearing fit. Ground from cobalt high-speed steel (HSS-Co M35) with a six-flute straight design and a 45° lead chamfer that produces a smooth N6 (Ra ~0.8 µm) surface finish in steel and cast iron.
Set contents (6 pieces, DIN 212)
- 6 H7, 8 H7, 10 H7, 12 H7, 14 H7, 16 H7
- Each reamer ground to H7 size tolerance (typically +0.018 / 0 mm at 10 mm)
- Cylindrical shanks for ER collets and drill chucks
- Steam-tempered finish to resist built-up edge
Hole preparation
Drill the hole 0.2–0.4 mm under finished size before reaming (e.g. 9.7 mm drill for a 10 H7 reamer). Run at 50–70% of drilling RPM with a steady feed and adequate cutting fluid. Do not reverse the spindle while the reamer is in the hole — back the cutter out under power.
Why H7
H7 is the standard fit for press-fit bearings, dowel pins, and bushing bores. Pairing this set with k6 / m6 shafts gives a transition fit; with j6 / h6 shafts a clearance fit. The tight tolerance band makes H7 reaming the default finishing operation in jig and fixture work.
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