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7/32-20 BSW HSS Bottom Tap (fractional equivalent for #12-20), Stanley Plane Restoration Tools, see #10, 13, 14 & 15 in blue on the attached Stanley Plane parts diagram This tap will let you thread and chase the frog, tote handle and knob screw holes as found in the cast-iron base of the plane and also in the slotted round brass nuts used to secure the tote handles and knobs
A taper tap is best for starting and threading a new hole due to the extended chamfer. If your budget allows for only one tap, I recommend a plug tap. A plug tap will let you start and thread a new hole and also allow threading a blind hole to within ~1/8" of the bottom. A bottom tap allows chasing and tapping threads very close to the bottom of blind holes. This Bottom Tap will allow threading a blind hole to within ~1/16" of the bottom. All taps and dies can be used for chasing. Chasing is the process of rethreading damaged, rusty or paint filled threads.
British Standard Whitworth aka BSW is a 55 degree thread angle used by Stanley on this size thread
High Speed Steel (HSS) is a broad description of steel grade. A chair made of wood is also a broad description. Is the chair made of soft wood like pine or something hard like hickory? Our HSS taps and dies are made from M2 HSS, a premium grade tool steel utilizing 0.85% carbon (C) 4.15% chromium (Cr) 6.15% tungsten (W) 5.0% molybdenum (Mo) and 1.85% vanadium (V). These added elements provide a high level of hardness and increased resistance to wear.
Cutting fluid reduces friction and helps produce smoother threads. *** Please wear your safety glasses ***
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