COUNTER BORING · 818 SERIES

TBH counter boring headCounter boring on the push stroke.

The 818 series TBH is a push-type counter boring head. One tool covers several diameters to save machining time, and the fibre pads on the head keep machining stable, even in deep holes. Ø38.10–165.60 mm is available from stock; for larger diameters, please ask us about made-to-order heads.

Find by diameter Catalogue PDF

RANGE: Ø38.10 – 165.60 mm
METHOD: Push
STOCK: Listed sizes in stock
INSERT: TXN (cartridge CTX)
PADS: Pad shoes · fibre pads

FEATURES

Many diameters, one tool.Why the 818 series.

Features of the 818 series, as described in the 2026 BTA Solution catalogue.

ONE TOOL

Several diameters, one tool

One tool machines a range of diameters, greatly reducing machining time.

PRECISION

Accurate diameter and form

Holds an accurate diameter and form at every step for higher machining precision.

MATERIALS

Wide range of materials

Suits a wide range of materials, including steel, stainless steel and aluminium.

FIBRE PAD

Stable with fibre pads

Fibre pads on the head keep machining stable, even in deep holes.

SPECIFICATIONS

SpecificationsFind a head by diameter.

Within each diameter range, the diameter is set by the pad shoe thickness (S · S1 · S2). Values are as in the original 2026 BTA Solution catalogue.

Enter a diameter and press Find. Matching sizes appear here, and their rows are highlighted in the table below.

818 series TBH
Order code	Tube ODmm	dmm	Lmm	Adjustment range	Pad shoes	Pad shoe shim set	Cartridge	Insert	Support pad
TBH-08D38.10-42.30	33.0	30.0	168.00	-	818-10-0720-S	-	CTX16-K-R	TXN 160408	LNXT 0720-SUP
				2 mm	818-10-0720-S1
				4.2 mm	818-10-0720-S2
TBH-08D42.30-46.50	33.0	30.0	168.00	-	818-10-0720-S	-	CTX16-K-R	TXN 160408	LNXT 0720-SUP
				2 mm	818-10-0720-S1
				4.2 mm	818-10-0720-S2
TBH-08D46.50-50.80	33.0	30.0	168.00	-	818-10-0720-S	-	CTX16-K-R	TXN 160408	LNXT 0720-SUP
				2 mm	818-10-0720-S1
				4.2 mm	818-10-0720-S2
TBH-11D50.80-55.00	43.0	39.0	186.00	-	818-10-1030-S	-	CTX16-K-R	TXN 160408	LNXT 1030-SUP
				2 mm	818-10-1030-S1
				4.2 mm	818-10-1030-S2
TBH-11D55.00-59.20	43.0	39.0	186.00	-	818-10-1030-S	-	CTX16-K-R	TXN 160408	LNXT 1030-SUP
				2 mm	818-10-1030-S1
				4.2 mm	818-10-1030-S2
TBH-11D59.20-63.50	43.0	39.0	186.00	-	818-10-1030-S	-	CTX16-K-R	TXN 160408	LNXT 1030-SUP
				2 mm	818-10-1030-S1
				4.2 mm	818-10-1030-S2
TBH-13D63.50-67.70	51.0	47.0	186.00	-	818-10-1235-S	-	CTX16-K-R	TXN 160408	LNXT 1235-SUP
				2 mm	818-10-1235-S1
				4.2 mm	818-10-1235-S2
TBH-13D67.70-71.90	51.0	47.0	190.50	-	818-10-1235-S	-	CTX16-K-R	TXN 160408	LNXT 1235-SUP
				2 mm	818-10-1235-S1
				4.2 mm	818-10-1235-S2
TBH-13D71.90-76.20	51.0	47.0	190.50	-	818-10-1235-S	-	CTX16-K-R	TXN 160408	LNXT 1235-SUP
				2 mm	818-10-1235-S1
				4.2 mm	818-10-1235-S2
TBH-16D76.20-88.90	68.0	63.0	270.00	6.35 mm	818-12-065-S	818-12-650420	CTX25-K-R	TXN 250408	LNXT35 D075-SUP
TBH-16D76.20-88.90	68.0	63.0	270.00	12.7 mm	818-12-065-S1	818-12-650420	CTX25-K-R	TXN 250408	LNXT35 D075-SUP
TBH-18D88.90-101.60	82.0	77.0	310.00	6.35 mm	818-12-065-S	818-12-650420	CTX25-K-R	TXN 250408	LNXT35 D085-SUP
TBH-18D88.90-101.60	82.0	77.0	310.00	12.7 mm	818-12-065-S1	818-12-650420	CTX25-K-R	TXN 250408	LNXT35 D085-SUP
TBH-19D101.60-117.60	94.0	89.0	330.00	8.0 mm	818-16-110-S	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D100-SUP
TBH-19D101.60-117.60	94.0	89.0	330.00	16.0 mm	818-16-110-S1	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D100-SUP
TBH-19D117.60-133.60	94.0	89.0	330.00	8.0 mm	818-16-110-S	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D100-SUP
TBH-19D117.60-133.60	94.0	89.0	330.00	16.0 mm	818-16-110-S1	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D100-SUP
TBH-19D133.60-149.60	94.0	89.0	380.00	8.0 mm	818-16-110-S	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D130-SUP
TBH-19D133.60-149.60	94.0	89.0	380.00	16.0 mm	818-16-110-S1	818-16-110420	CTX40-K-R	TXN 400408	LNXT50 D130-SUP
TBH-20D149.60-165.60	106.0	101.0	400.00	8.0 mm	818-16-110-S	818-16-110420	CTX40-K-R	TXN 400408	430.32-16D140.00
TBH-20D149.60-165.60	106.0	101.0	400.00	16.0 mm	818-16-110-S1	818-16-110420	CTX40-K-R	TXN 400408	430.32-16D140.00

Products or tube types not listed here can be made to order.

PARTS

Components.Pads · cartridges · inserts.

Components by order code, with pad shoe and cartridge sizes.

Components by order code
Order code	Support pad screw	Sub guide pad	Blank fibre pad	Seat protection plate	Sub guide pad screw	Blank fibre pad screw	Seat protection plate screw
TBH-08D38.10-42.30	416.1-832-M3.0	142030-F	5571 001-05	-	5513 020-01-M3.5	CML-0306	-
TBH-08D42.30-46.50	416.1-832-M3.0	142030-F	5571 001-05	-	5513 020-01-M3.5	CML-0306	-
TBH-08D46.50-50.80	416.1-832-M3.0	142030-F	5571 001-05	-	5513 020-01-M3.5	CML-0306	-
TBH-11D50.80-55.00	416.1-833-M3.5	142067-F	5571 001-06	-	5513 020-01-M3.5	CML-0410	-
TBH-11D55.00-59.20	416.1-833-M3.5	142067-F	5571 001-06	-	5513 020-01-M3.5	CML-0410	-
TBH-11D59.20-63.50	416.1-833-M3.5	142067-F	5571 001-06	-	5513 020-01-M3.5	CML-0410	-
TBH-13D63.50-67.70	416.1-833-M3.5	142067-F	5571 001-06	-	5513 020-01-M3.5	CML-0410	-
TBH-13D67.70-71.90	416.1-833-M3.5	142067-F	5571 001-06	5549 029-01	5513 020-01-M3.5	CML-0410	3212 020-259
TBH-13D71.90-76.20	416.1-833-M3.5	142067-F	5571 001-06	5549 029-02	5513 020-01-M3.5	CML-0410	3212 020-309
TBH-16D76.20-88.90	5513 020-01-M3.5	142067-F	5571 001-07	5549 029-03	5513 020-01-M3.5	CML-0512	3212 020-360
TBH-18D88.90-101.60	5513 020-01-M3.5	142067-F	5571 001-08	5549 029-04	5513 020-01-M3.5	CML-0614	3212 020-410
TBH-19D101.60-117.60	5513 020-26-M5.0	142067-F	5571 001-09	5549 029-04	5513 020-01-M3.5	CML-0614	3212 020-410
TBH-19D117.60-133.60	5513 020-26-M5.0	202582-F	5571 001-09	5549 029-05	5513 020-26-M5.0	CML-0614	3212 020-462
TBH-19D133.60-149.60	5513 020-26-M5.0	202582-F	5571 001-10	5549 029-05	5513 020-26-M5.0	CML-0816	3212 020-462
TBH-20D149.60-165.60	5513 020-26-M5.0	202582-F	5571 001-10	5549 029-05	5513 020-26-M5.0	CML-0816	3212 020-462

Pad shoes
Pad shoes	Imm	Wmm	Smm	Screw	Driver
818-10-0720-S	26	10	1.5	-	—
818-10-0720-S1	26	10	2.5	-	—
818-10-0720-S2	26	10	3.6	-	—
818-10-1030-S	36	15	2	-	—
818-10-1030-S1	36	15	3	-	—
818-10-1030-S2	36	15	4.1	-	—
818-10-1235-S	41	17	2	-	—
818-10-1235-S1	41	17	3	-	—
818-10-1235-S2	41	17	4.1	-	—
818-12-065-S	48	22	6.5	CML-0410	L-3.0
818-12-065-S1	48	22	10	CML-0410	L-3.0
818-16-110-S	65	32	11	CML-0515	L-3.0
818-16-110-S1	65	32	15	CML-0515	L-3.0

Cartridge
Cartridge	Insert	Fmm	Lmm	Insert screw	Insert screw driver	Cartridge screw	Cartridge screw driver
CTX16-K	TXN160408-G-L	16.00	32.00	5513 020-02-M4	TORX PLUS-T15	CML-0515	L-4.0
CTX25-K	TXN250408-G-L	24.00	54.00	5513 020-55-M5	TORX PLUS-T20	CML-0825	L-6.0
CTX40-K	TXN400708-G-L	32.00	56.00	5513 020-14-M6	TORX PLUS-T25	CML-1030	L-8.0

Inserts (TXN)
Insert	Imm	Wmm	Smm
TXN160408-G-L	10.9	11.9	4.76
TXN250408-G-L	17.2	18.8	4.76
TXN400708-G-L	23.5	25.5	7.00

Recommended insert grades
Material	1st-choice grade	2nd-choice grade
Steel (P)	HM3	SM3
Stainless steel (M)	SM3	IM3
Cast iron (K)	HM3	SM3
Non-ferrous metals (N)	SM3	IM3
Difficult-to-cut materials · heat-resistant alloys (S)	IM3	SM3

SHIM SETS

Shim sets.Set the diameter by thickness.

Shims behind the cartridges and pads fine-tune the diameter.

Cartridge shims
Cartridge	Thicknessmm	Part no.
CTX16-K	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-160420
CTX25-K	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-250420
CTX40-K	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-400420

Compatible cartridge shims
Cartridge (compatible)	Thicknessmm	Part no.
CTP17-K-SP	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-170420
CTP24-K-SP	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-240420
CTP28-K-SP	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	CX-280420

Pad shoe shims
Pad shoes	Thicknessmm	Part no.
818-12-065-S	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	818-12-650420
818-16-110-S	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	818-16-110420
818-18-300-R	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	818-18-300420
818-26-500-R	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	818-26-500420

Safety pad shims
Safety pad	Thicknessmm	Part no.
142030-S	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	300420S
142067-S	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	670420S
202582-S	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	820420S

Fibre guide pad shims
Fibre guide pad	Thicknessmm	Part no.
142067-F	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	670420F
202582-F	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	820420F

Support pad shims (LNXT)
Support pad	Thicknessmm	Part no.
LNXT 0618-SUP	0.02 · 0.03 · 0.05 (4 pcs each)	800-060420
LNXT 0720-SUP	0.02 · 0.03 · 0.05 (4 pcs each)	800-070420
LNXT 0825-SUP	0.02 · 0.03 · 0.05 (4 pcs each)	800-080420
LNXT 1030-SUP	0.02 · 0.03 · 0.05 (4 pcs each)	800-100420
LNXT 1235-SUP	0.02 · 0.03 · 0.05 (4 pcs each)	800-120420

Support pad shims (LNXT35 · 50)
Support pad	Thicknessmm	Part no.
LNXT35DXXX-SUP	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	0350420
LNXT50DXXX-SUP	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	0500420

Brazed support pad shims
Support pad	Thicknessmm	Part no.
430.32-10DXX.XX	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	0120420
430.32-12DXX.XX	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	0350420
430.32-16DXX.XX	0.05 · 0.1 · 0.2 · 0.3 · 0.5 (4 pcs each)	0500420

Blank fibre pad
Blank fibre pad	Thicknessmm	Part no.
5571 001-08	1.0 (3 pcs each)	00108-1
5571 001-09	1.0 (3 pcs each)	00109-1
5571 001-10	1.0 (3 pcs each)	00110-1
5571 001-11	1.0 (3 pcs each)	00111-1
5571 001-12	1.0 (3 pcs each)	00112-1

COUNTER BORING LINE-UP

For other diameters.Counter boring line-up.

One diameter range, two methods: push (TBH) and pull (BBH).

TBH818 · push · Ø38.10 – 165.60
BBH818 · pull · Ø38.10 – 165.60

All Counter boring

Need a diameter over Ø165.60 mm?Send us the drawing.

Tell us the existing hole diameter, target diameter, depth and machine, and we will suggest the right head.

+82-31-430-7094