HTD Timing Pulleys Taper Bush 5M 8M 14M

Overview and series

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What are HTD Taper Bush timing pulleys?

HTD Taper Bush timing pulleys combine the advantages of the HTD profile (metric pitch, rounded tooth, high torque) with the benefits of the Taper Bush system (conical self-centering, fast bolt-only assembly and disassembly, no heating required). Designed for medium and heavy duty drives with frequent disassembly needs and larger shaft diameters.

Series: HTD 5M (pitch 5 mm, width 15 mm), HTD 8M (pitch 8 mm, widths 20/30/50/85 mm), HTD 14M (pitch 14 mm, widths 40/55/85/115/170 mm). Materials: steel (smaller sizes) and cast iron (higher tooth counts).

Series and technical data

Three profiles — HTD 5M, 8M and 14M — covering 22 to 192 teeth:

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Profile	Pitch	Widths F (mm)	Teeth	TB range	Material
HTD 5M TB	5.0 mm	15 mm	34–136	1008–2012	Steel
HTD 8M TB	8.0 mm	20 / 30 / 50 / 85 mm	22–192	1008–3525	Steel / Cast iron
HTD 14M TB	14.0 mm	40 / 55 / 85 / 115 / 170 mm	28–192	2012–5050	Steel / Cast iron

Catalogue data

Catalogue data — HTD 5M Taper Bush, width 15 mm

Pitch 5 mm · F = 22 mm · Steel · TB: 1008–2012 · Teeth: 34–136

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	Fl.	Kg
TL 34 5M 15	15F	St	34	1008	25	54.11	52.97	57	—	22	22	—	213	0.20
TL 36 5M 15	15F	St	36	1108	25	57.30	56.15	60	—	22	22	—	214	0.25
TL 40 5M 15	15F	St	40	1108	25	63.66	62.52	71	—	22	22	—	217	0.35
TL 44 5M 15	15F	St	44	1108	25	70.03	68.89	75	—	22	22	—	218	0.40
TL 48 5M 15	10F	St	48	1210	32	76.39	75.25	83	59	22	25	3	219	0.46
TL 56 5M 15	10F	St	56	1210	32	89.13	87.99	93	70	22	25	3	222	0.60
TL 64 5M 15	10F	St	64	1210	32	101.86	100.72	106	80	22	25	3	224	0.80
TL 72 5M 15	10	St	72	1610	42	114.59	113.45	—	92	22	25	3	—	1.20
TL 80 5M 15	10	St	80	1610	42	127.32	126.18	—	92	22	25	3	—	1.76
TL 90 5M 15	10	St	90	1610	42	143.24	142.10	—	92	22	25	3	—	2.32
TL112 5M 15	10	St	112	2012	50	178.25	177.11	110	—	20	32	12	—	3.72
TL136 5M 15	13	St	136	2012	50	216.45	215.31	110	199	20	32	6	—	3.82

Catalogue data — HTD 8M Taper Bush, width 20 mm

Pitch 8 mm · F = 28 mm · Steel: 22–56 teeth · Cast iron: 80–90 teeth · TB: 1008–2012

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	R	Fl.	Kg
TL 22 8M 20	16F	St	22	1008	25	56.02	54.65	60	—	37	28	22	6	308	0.25
TL 24 8M 20	16F	St	24	1108	25	61.11	59.74	66	—	44	28	22	6	310	0.30
TL 28 8M 20	16F	St	28	1108	25	71.30	70.08	75	—	50	28	22	6	312	0.45
TL 32 8M 20	16F	St	32	1610	42	81.49	80.16	87	—	63	28	25	3	315	0.43
TL 36 8M 20	16F	St	36	1610	42	91.67	90.30	98	—	68	28	25	3	319	0.70
TL 40 8M 20	16F	St	40	1610	42	101.86	100.49	106	—	76	28	25	3	321	1.10
TL 44 8M 20	10F	St	44	2012	50	112.05	110.67	119	92	—	28	32	4	325	1.20
TL 48 8M 20	10F	St	48	2012	50	122.23	120.86	127	96	—	28	32	4	327	1.65
TL 64 8M 20	11F	St	64	2012	50	162.97	161.60	168	110	137	28	32	4	338	2.60
TL 72 8M 20	11F	St	72	2012	50	183.35	181.97	192	110	158	28	32	4	340	3.40
TL 80 8M 20	11	GG	80	2012	50	203.72	202.35	—	110	180	28	32	4	—	3.60
TL 90 8M 20	11	GG	90	2012	50	229.18	227.81	—	110	204	28	32	4	—	4.10

Catalogue data — HTD 8M Taper Bush, width 50 mm

Pitch 8 mm · F = 60 mm · Steel: 28–72 teeth · Cast iron: 80–192 teeth · TB: 1210–3525

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	R	Fl.	Kg
TL 28 8M 50	16F	St	28	1210	32	71.30	70.08	75	—	50	60	25	35	312	0.60
TL 32 8M 50	16F	St	32	1615	42	81.49	80.16	87	—	63	60	38	22	315	0.80
TL 36 8M 50	16F	St	36	1615	42	91.67	90.30	98	—	68	60	38	22	319	1.35
TL 40 8M 50	18F	St	40	2012	50	101.86	100.49	106	—	80	60	32	14	321	1.70
TL 48 8M 50	18F	St	48	2012	50	122.23	120.86	127	—	95	60	32	14	327	2.35
TL 56 8M 50	18F	St	56	2517	60	142.60	141.23	148	—	116	60	45	7.5	333	3.35
TL 64 8M 50	18F	St	64	2517	60	162.97	161.60	168	—	136	60	45	7.5	338	4.90
TL 72 8M 50	19F	St	72	2517	60	183.35	181.97	192	125	158	60	45	7.5	340	6.90
TL 80 8M 50	18	GG	80	3020	75	203.72	202.35	—	—	180	60	51	4.5	—	8.90
TL 90 8M 50	19	GG	90	3020	75	229.18	227.81	—	160	204	60	51	4.5	—	9.90
TL112 8M 50	19	GG	112	3020	75	285.21	283.83	—	170	254	60	51	4.5	—	12.10
TL144 8M 50	20	GG	144	3020	75	366.69	365.32	—	170	336	60	51	4.5	—	15.40
TL168 8M 50	14	GG	168	3525	90	427.81	426.44	—	198	395	60	65	2.5	—	22.80
TL192 8M 50	14	GG	192	3525	90	488.92	487.55	—	198	455	60	65	2.5	—	26.50

Catalogue data — HTD 14M Taper Bush, width 40 mm

Pitch 14 mm · F = 54 mm · Steel: 28–48 teeth · Cast iron: 56–192 teeth · TB: 2012–3020

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	R	Fl.	Kg
TL 28 14M 40	18F	St	28	2012	50	124.78	122.12	127	—	94	54	32	11	400	2.10
TL 32 14M 40	18F	St	32	2012	50	142.60	139.88	154	—	108	54	32	11	403	3.40
TL 36 14M 40	18F	St	36	2517	60	160.43	157.68	168	—	120	54	45	4.5	405	4.80
TL 40 14M 40	18F	St	40	2517	60	178.25	175.49	188	—	138	54	45	4.5	407	6.00
TL 44 14M 40	18F	St	44	3020	75	196.08	193.28	211	—	155	54	51	1.5	411	7.50
TL 48 14M 40	18F	St	48	3020	75	213.90	211.11	226	—	170	54	51	1.5	412	8.50
TL 56 14M 40	18F	GG	56	3020	75	249.55	246.76	256	—	208	54	51	1.5	416	10.10
TL 64 14M 40	19F	GG	64	3020	75	285.21	282.41	296	170	240	54	51	1.5	418	13.40
TL 72 14M 40	19	GG	72	3020	75	320.86	318.06	—	170	280	54	51	1.5	—	15.00
TL 90 14M 40	20	GG	90	3020	75	401.07	398.28	—	170	360	54	51	1.5	—	18.00
TL112 14M 40	20	GG	112	3020	75	499.11	496.32	—	170	457	54	51	1.5	—	25.50
TL144 14M 40	20	GG	144	3020	75	641.71	638.92	—	170	600	54	51	1.5	—	32.00
TL192 14M 40	20	GG	192	3020	75	855.62	852.82	—	170	813	54	51	1.5	—	49.50

Catalogue data — HTD 14M Taper Bush, width 115 mm

Pitch 14 mm · F = 133 mm · TB: 2517–4040 · Teeth: 28–192

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	R	Fl.	Kg
TL 28 14M 115	18F	St	28	2517	60	124.78	122.12	127	—	98	133	45	44	400	3.80
TL 32 14M 115	18F	St	32	2517	60	142.60	139.88	154	—	108	133	45	44	403	6.80
TL 36 14M 115	18F	St	36	3020	75	160.43	157.68	168	—	125	133	51	41	405	7.00
TL 40 14M 115	18F	St	40	3020	75	178.25	175.49	188	—	138	133	51	41	407	9.10
TL 44 14M 115	18F	St	44	3030	75	196.08	193.28	211	—	155	133	76	28.5	411	13.00
TL 48 14M 115	18F	St	48	3030	75	213.90	211.11	226	—	170	133	76	28.5	412	16.00
TL 56 14M 115	18F	GG	56	3535	90	249.55	246.76	256	—	210	133	89	22	416	24.00
TL 64 14M 115	19F	GG	64	3535	90	285.21	282.41	296	190	240	133	89	22	418	32.00
TL 72 14M 115	19	GG	72	3535	90	320.86	318.06	—	190	280	133	89	22	—	31.00
TL 90 14M 115	20	GG	90	3535	90	401.07	398.28	—	190	360	133	89	22	—	37.00
TL112 14M 115	20	GG	112	3535	90	499.11	496.32	—	190	457	133	89	22	—	45.00
TL144 14M 115	20	GG	144	4040	100	641.71	638.92	—	230	600	133	102	15.5	—	63.00
TL192 14M 115	20	GG	192	4040	100	855.62	852.82	—	230	813	133	102	15.5	—	95.00

Catalogue data — HTD 14M Taper Bush, width 170 mm (heavy duty)

Pitch 14 mm · F = 187 mm · TB: 3030–5050 · Teeth: 38–192

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Code	Type	Mat.	Teeth	TB	Bore	dp	de	Df	Dm	Di	F	L	R	Fl.	Kg
TL 38 14M 170	18F	St	38	3030	75	169.34	166.60	183	—	130	187	76	55.5	406	11.70
TL 44 14M 170	18F	St	44	3535	90	196.08	193.28	211	—	155	187	89	49	411	15.00
TL 56 14M 170	18F	St	56	3535	90	249.55	246.76	256	—	210	187	89	49	416	28.50
TL 64 14M 170	18F	GG	64	4040	100	285.21	282.41	296	—	240	187	102	42.5	418	41.00
TL 80 14M 170	19	GG	80	4040	100	356.51	353.71	—	230	315	187	102	42.5	—	48.00
TL 90 14M 170	20	GG	90	4040	100	401.07	398.28	—	230	360	187	102	42.5	—	52.50
TL112 14M 170	20	GG	112	5050	125	499.11	496.32	—	265	457	187	127	30	—	74.50
TL144 14M 170	20	GG	144	5050	125	641.71	638.92	—	265	600	187	127	30	—	91.00
TL192 14M 170	20	GG	192	5050	125	855.62	852.82	—	265	813	187	127	30	—	134.00

Taper Bush sizes

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Taper Bush	Max bore (mm)	Typical for series
1008	25	HTD 5M TB (34–36 зъба), HTD 8M TB (22–28 зъба)
1108	25	HTD 8M TB (24–30 зъба)
1210	32	HTD 5M TB (48), HTD 8M TB (28–30)
1610	42	HTD 5M TB (72–90), HTD 8M TB (32–40)
1615	42	HTD 8M TB 30 серия (30–40 зъба)
2012	50	HTD 5M TB (112), HTD 8M TB (44–90), HTD 14M (28–48)
2517	60	HTD 8M TB 50/85, HTD 14M (28–48)
3020	75	HTD 8M TB 50/85 GG, HTD 14M (44–192)
3030	75	HTD 14M (44–48 St)
3525	90	HTD 8M TB 50/85 GG, HTD 14M 85/115
3535	90	HTD 14M 85/115 GG
4040	100	HTD 14M 115/170 GG
5050	125	HTD 14M 170 GG (112–192 зъба)

Flange types (TB version)

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Code	Description	Typical for
10F	1 фланец + централна главина	HTD 5M TB (48–64 зъба)
10	Без фланец, с Di	HTD 5M TB (72–90)
11F	2 фланеца + Di	HTD 8M TB 20 (64–72 зъба)
11	GG без фланец, с Di	HTD 8M TB 20 (80–90)
12	GG без фланец, с Di	HTD 8M TB 30 GG
13	St без фланец, с Di	HTD 5M TB 136 зъба
14	GG без фланец, голям Di	HTD 8M TB 50 (168–192)
15F	1 фланец	HTD 5M TB (34–44), HTD 8M TB 30
16F	2 фланеца — стандарт	HTD 8M TB 20/50 (до ~40 зъба)
18F	2 фланеца + разширена главина	HTD 8M TB 50/85, HTD 14M St
19F	3 фланеца + Di	HTD 8M TB 50/85 GG, HTD 14M GG
19	GG без фланец, с Di	HTD 8M TB 50/85, HTD 14M GG
20	GG без фланец, голям Di	HTD 14M GG (80+)

HTD Taper Bush timing pulleys

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Frequently Asked Questions

What is the difference between HTD Taper Bush and HTD pilot bore pulleys?

HTD pilot bore: machined to the specific shaft diameter — permanent mounting, press tools required for removal. HTD Taper Bush: conical seat, bolt-only assembly and disassembly — self-centering, higher torque for the same hub diameter, suitable for frequent disassembly (maintenance, belt replacement).

Why do HTD 8M width 50 mm pulleys have larger TB sizes than width 20 mm?

Wider pulleys (50, 85 mm) transmit higher torque for the same tooth count — so they require a larger Taper Bush for reliable clamping. HTD 8M 50mm reaches TB 3525 (90 mm bore), while HTD 8M 20mm reaches only TB 2012 (50 mm bore).

How do I order an HTD Taper Bush pulley?

Specify: profile (HTD 5M/8M/14M), width (15/20/30/50/85/115/170 mm), tooth count, Taper Bush size, shaft diameter. Example: TL 48 8M 50, TB 2012, shaft Ø 45 mm. Contact: nibora@nibora.com, +359 64 681 058.

Can HTD Taper Bush pulleys be used with Imperial belts?

No — HTD profiles (5M/8M/14M) are strictly for HTD belts. Imperial belts (L, H, XH) have an incompatible trapezoidal tooth profile. Mixing profiles can cause damage and injury.

What is the maximum shaft diameter for each Taper Bush size?

1008: 25 mm | 1210: 32 mm | 1610/1615: 42 mm | 2012: 50 mm | 2517: 60 mm | 3020/3030: 75 mm | 3525/3535: 90 mm | 4040: 100 mm | 5050: 125 mm. Select based on your shaft diameter and available Taper Bush sizes for the chosen pulley.

HTD Timing Pulleys with Taper Bush Mounting — Profiles 5M, 8M, 14M

Overview and series

What are HTD Taper Bush timing pulleys?

Series and technical data

Catalogue data

Catalogue data — HTD 5M Taper Bush, width 15 mm

Catalogue data — HTD 8M Taper Bush, width 20 mm

Catalogue data — HTD 8M Taper Bush, width 50 mm

Catalogue data — HTD 14M Taper Bush, width 40 mm

Catalogue data — HTD 14M Taper Bush, width 115 mm

Catalogue data — HTD 14M Taper Bush, width 170 mm (heavy duty)

Taper Bush sizes

Flange types (TB version)

Frequently Asked Questions

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