BT Boring Bar Blanks – BT30, BT40 and BT50 (MAS 403)

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 a BT shank (MAS 403 / JIS B6339, ISO 7388-2 type J) in BT30, BT40 and BT50: blank Ø30–120 mm, gauge lengths 60–350 mm, 93 ordering codes in all. They are pulled into the spindle by MAS-BT or JIS B6339 pull studs: M12 on BT30, M16 on BT40 and M24 on BT50. Hardened AT3 taper, machinable HRc 28–32 body.

Request a quote WhatsApp

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

All 93 BT boring bar blanks

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

BT30 boring bar blanks: 15 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46BT30BBB030060	30 mm	60 mm
46BT30BBB030120	30 mm	120 mm
46BT30BBB030150	30 mm	150 mm
46BT30BBB035060	35 mm	60 mm
46BT30BBB035120	35 mm	120 mm
46BT30BBB035150	35 mm	150 mm
46BT30BBB040080	40 mm	80 mm
46BT30BBB040150	40 mm	150 mm
46BT30BBB040180	40 mm	180 mm
46BT30BBB045100	45 mm	100 mm
46BT30BBB045150	45 mm	150 mm
46BT30BBB045180	45 mm	180 mm
46BT30BBB050100	50 mm	100 mm
46BT30BBB050150	50 mm	150 mm
46BT30BBB050180	50 mm	180 mm

BT40 boring bar blanks: 39 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46BT40BBB030060	30 mm	60 mm
46BT40BBB030120	30 mm	120 mm
46BT40BBB030150	30 mm	150 mm
46BT40BBB035060	35 mm	60 mm
46BT40BBB035120	35 mm	120 mm
46BT40BBB035150	35 mm	150 mm
46BT40BBB040080	40 mm	80 mm
46BT40BBB040120	40 mm	120 mm
46BT40BBB040150	40 mm	150 mm
46BT40BBB045100	45 mm	100 mm
46BT40BBB045150	45 mm	150 mm
46BT40BBB045180	45 mm	180 mm
46BT40BBB050100	50 mm	100 mm
46BT40BBB050150	50 mm	150 mm
46BT40BBB050180	50 mm	180 mm
46BT40BBB055120	55 mm	120 mm
46BT40BBB055180	55 mm	180 mm
46BT40BBB055200	55 mm	200 mm
46BT40BBB060120	60 mm	120 mm
46BT40BBB060180	60 mm	180 mm
46BT40BBB060200	60 mm	200 mm
46BT40BBB063120	63 mm	120 mm
46BT40BBB063150	63 mm	150 mm
46BT40BBB063180	63 mm	180 mm
46BT40BBB063200	63 mm	200 mm
46BT40BBB063250	63 mm	250 mm
46BT40BBB063300	63 mm	300 mm
46BT40BBB080150	80 mm	150 mm
46BT40BBB080200	80 mm	200 mm
46BT40BBB080250	80 mm	250 mm
46BT40BBB100120	100 mm	120 mm
46BT40BBB100150	100 mm	150 mm
46BT40BBB100200	100 mm	200 mm
46BT40BBB100250	100 mm	250 mm
46BT40BBB120120	120 mm	120 mm
46BT40BBB120150	120 mm	150 mm
46BT40BBB120200	120 mm	200 mm
46BT40BBB120250	120 mm	250 mm
46BT40BBB120300	120 mm	300 mm

BT50 boring bar blanks: 39 ordering codes

Ordering code	Blank Ø (C)	Gauge Length (GPL)
46BT50BBB040080	40 mm	80 mm
46BT50BBB040150	40 mm	150 mm
46BT50BBB040180	40 mm	180 mm
46BT50BBB045100	45 mm	100 mm
46BT50BBB045180	45 mm	180 mm
46BT50BBB045220	45 mm	220 mm
46BT50BBB050100	50 mm	100 mm
46BT50BBB050180	50 mm	180 mm
46BT50BBB050220	50 mm	220 mm
46BT50BBB055100	55 mm	100 mm
46BT50BBB055180	55 mm	180 mm
46BT50BBB055220	55 mm	220 mm
46BT50BBB060120	60 mm	120 mm
46BT50BBB060180	60 mm	180 mm
46BT50BBB060220	60 mm	220 mm
46BT50BBB065120	65 mm	120 mm
46BT50BBB065180	65 mm	180 mm
46BT50BBB065220	65 mm	220 mm
46BT50BBB070150	70 mm	150 mm
46BT50BBB070200	70 mm	200 mm
46BT50BBB070250	70 mm	250 mm
46BT50BBB070300	70 mm	300 mm
46BT50BBB080150	80 mm	150 mm
46BT50BBB080200	80 mm	200 mm
46BT50BBB080250	80 mm	250 mm
46BT50BBB080300	80 mm	300 mm
46BT50BBB080350	80 mm	350 mm
46BT50BBB085180	85 mm	180 mm
46BT50BBB085220	85 mm	220 mm
46BT50BBB085280	85 mm	280 mm
46BT50BBB085320	85 mm	320 mm
46BT50BBB095180	95 mm	180 mm
46BT50BBB095280	95 mm	280 mm
46BT50BBB095320	95 mm	320 mm
46BT50BBB120120	120 mm	120 mm
46BT50BBB120150	120 mm	150 mm
46BT50BBB120200	120 mm	200 mm
46BT50BBB120250	120 mm	250 mm
46BT50BBB120300	120 mm	300 mm

Questions about BT boring bar blanks

Which pull stud does a BT boring bar blank take?

The pull stud of its taper size: M12 on BT30, M16 on BT40 and M24 on BT50. Use a MAS-BT pull stud with the head angle your drawbar takes (45°, 60° or 90°), or a JIS B6339 stud with a 15° head (BT40 and BT50).

BT30 pull studs BT40 pull studs BT50 pull studs

What goes with a BT boring bar blank?

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