SK (ISO) Boring Bar Blanks – SK30, SK40 and SK50 (DIN 69871)

A boring bar blank is a blank with a hardened taper and a machinable HRc 28–32 body for making special boring bars and tools. PTP makes them with an SK (ISO) shank (DIN 69871 / ISO 7388-1) in SK30, SK40 and SK50: blank Ø30–120 mm, gauge lengths 60–350 mm, 93 ordering codes in all. They are pulled into the spindle by DIN 69872 pull studs: M12 on SK30, M16 on SK40 and M24 on SK50. Hardened AT3 taper, machinable HRc 28–32 body.

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Boring Bar Blanks, SK (ISO) shank: technical drawing with dimensions — Boring Bar Blanks with a SK (ISO) shank, from the PTP catalogue. Click to open it full size.

All 93 SK (ISO) boring bar blanks

One table per taper size. Every ordering code opens its own page with its dimensions (mm).

SK30 boring bar blanks: 15 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46ISO30BBB030060	30 mm	60 mm
46ISO30BBB030120	30 mm	120 mm
46ISO30BBB030150	30 mm	150 mm
46ISO30BBB035060	35 mm	60 mm
46ISO30BBB035120	35 mm	120 mm
46ISO30BBB035150	35 mm	150 mm
46ISO30BBB040080	40 mm	80 mm
46ISO30BBB040150	40 mm	150 mm
46ISO30BBB040180	40 mm	180 mm
46ISO30BBB045100	45 mm	100 mm
46ISO30BBB045150	45 mm	150 mm
46ISO30BBB045180	45 mm	180 mm
46ISO30BBB050100	50 mm	100 mm
46ISO30BBB050150	50 mm	150 mm
46ISO30BBB050180	50 mm	180 mm

SK40 boring bar blanks: 39 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46ISO40BBB030060	30 mm	60 mm
46ISO40BBB030120	30 mm	120 mm
46ISO40BBB030150	30 mm	150 mm
46ISO40BBB035060	35 mm	60 mm
46ISO40BBB035120	35 mm	120 mm
46ISO40BBB035150	35 mm	150 mm
46ISO40BBB040080	40 mm	80 mm
46ISO40BBB040120	40 mm	120 mm
46ISO40BBB040150	40 mm	150 mm
46ISO40BBB045100	45 mm	100 mm
46ISO40BBB045150	45 mm	150 mm
46ISO40BBB045180	45 mm	180 mm
46ISO40BBB050100	50 mm	100 mm
46ISO40BBB050150	50 mm	150 mm
46ISO40BBB050180	50 mm	180 mm
46ISO40BBB055120	55 mm	120 mm
46ISO40BBB055180	55 mm	180 mm
46ISO40BBB055200	55 mm	200 mm
46ISO40BBB060120	60 mm	120 mm
46ISO40BBB060180	60 mm	180 mm
46ISO40BBB060200	60 mm	200 mm
46ISO40BBB063120	63 mm	120 mm
46ISO40BBB063150	63 mm	150 mm
46ISO40BBB063180	63 mm	180 mm
46ISO40BBB063200	63 mm	200 mm
46ISO40BBB063250	63 mm	250 mm
46ISO40BBB063300	63 mm	300 mm
46ISO40BBB080150	80 mm	150 mm
46ISO40BBB080200	80 mm	200 mm
46ISO40BBB080250	80 mm	250 mm
46ISO40BBB100120	100 mm	120 mm
46ISO40BBB100150	100 mm	150 mm
46ISO40BBB100200	100 mm	200 mm
46ISO40BBB100250	100 mm	250 mm
46ISO40BBB120120	120 mm	120 mm
46ISO40BBB120150	120 mm	150 mm
46ISO40BBB120200	120 mm	200 mm
46ISO40BBB120250	120 mm	250 mm
46ISO40BBB120300	120 mm	300 mm

SK50 boring bar blanks: 39 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46ISO50BBB040080	40 mm	80 mm
46ISO50BBB040150	40 mm	150 mm
46ISO50BBB040180	40 mm	180 mm
46ISO50BBB045100	45 mm	100 mm
46ISO50BBB045180	45 mm	180 mm
46ISO50BBB045220	45 mm	220 mm
46ISO50BBB050100	50 mm	100 mm
46ISO50BBB050180	50 mm	180 mm
46ISO50BBB050220	50 mm	220 mm
46ISO50BBB055100	55 mm	100 mm
46ISO50BBB055180	55 mm	180 mm
46ISO50BBB055220	55 mm	220 mm
46ISO50BBB060120	60 mm	120 mm
46ISO50BBB060180	60 mm	180 mm
46ISO50BBB060220	60 mm	220 mm
46ISO50BBB065120	65 mm	120 mm
46ISO50BBB065180	65 mm	180 mm
46ISO50BBB065220	65 mm	220 mm
46ISO50BBB070150	70 mm	150 mm
46ISO50BBB070200	70 mm	200 mm
46ISO50BBB070250	70 mm	250 mm
46ISO50BBB070300	70 mm	300 mm
46ISO50BBB080150	80 mm	150 mm
46ISO50BBB080200	80 mm	200 mm
46ISO50BBB080250	80 mm	250 mm
46ISO50BBB080300	80 mm	300 mm
46ISO50BBB080350	80 mm	350 mm
46ISO50BBB085180	85 mm	180 mm
46ISO50BBB085220	85 mm	220 mm
46ISO50BBB085280	85 mm	280 mm
46ISO50BBB085320	85 mm	320 mm
46ISO50BBB095180	95 mm	180 mm
46ISO50BBB095280	95 mm	280 mm
46ISO50BBB095320	95 mm	320 mm
46ISO50BBB120120	120 mm	120 mm
46ISO50BBB120150	120 mm	150 mm
46ISO50BBB120200	120 mm	200 mm
46ISO50BBB120250	120 mm	250 mm
46ISO50BBB120300	120 mm	300 mm

Questions about SK (ISO) boring bar blanks

Which pull stud does an SK boring bar blank take?

The pull stud of its taper size: M12 on SK30, M16 on SK40 and M24 on SK50. Use a DIN 69872 pull stud with a 15° head.

SK30 pull studs SK40 pull studs SK50 pull studs

What goes with an SK boring bar blank?

Your own machining: the blank's HRc 28–32 body is made into the boring bar or special tool you need.