Metric AT Style Synchronous Timing Belt Pulleys

AT5 Pitch
AT 5mm pitch x 10mm, 16mm, and 25mm belt widths
Bore is ± 1 mm
NOTE: ALL DIMENSIONS IN MILLIMETERS.  

For 10mm Belt Widths
example of part number structure   12-AT5-10-6F-A-6 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
12 AT5 10 6F A 6	19.25	17.85	23.0	21	15	11
14 AT5 10 6F A 6	22.45	21.05	25.0	21	15	14
15 AT5 10 6F A 6	24.05	22.65	28.0	21	15	16
16 AT5 10 6F A 6	25.60	24.20	32.0	21	15	18
18 AT5 10 6F A 6	28.80	27.40	32.0	21	15	20
19 AT5 10 6F A 6	30.40	29.00	36.0	21	15	22
20 AT5 10 6F A 6	32.00	30.60	36.0	21	15	23
22 AT5 10 6F A 6	35.25	33.85	38.0	21	15	24
24 AT5 10 6F A 6	38.40	37.00	42.0	21	15	26
25 AT5 10 6F A 6	40.00	38.60	44.0	21	15	26
26 AT5 10 6F A 6	41.60	40.20	44.0	21	15	26
27 AT5 10 6F A 8	43.20	41.80	48.0	21	15	30
28 AT5 10 6F A 8	44.75	43.35	48.0	21	15	32
30 AT5 10 6F A 8	47.95	46.55	51.0	21	15	34
32 AT5 10 6F A 8	51.10	49.70	54.0	21	15	38
36 AT5 10 6F A 8	57.45	56.05	64.0	21	15	38
40 AT5 10 6F A 8	63.85	62.45	66.5	21	15	40
42 AT5 10 6F A 8	67.00	65.60	70.0	21	15	40
44 AT5 10 6F A 8	70.20	68.80	-	21	15	45
48 AT5 10 6F A 8	76.55	75.15	-	21	15	50
60 AT5 10 6F A 8	95.65	94.25	-	21	15	65
For 16mm Belt Widths
example of part number structure   12-AT5-16-6F-A-6 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
12 AT5 16 6F A 6	19.25	17.85	23.0	27	21	11
14 AT5 16 6F A 6	22.45	21.05	25.0	27	21	14
15 AT5 16 6F A 6	24.05	22.65	28.0	27	21	16
16 AT5 16 6F A 6	25.60	24.20	32.0	27	21	18
18 AT5 16 6F A 8	28.80	27.40	32.0	27	21	20
19 AT5 16 6F A 8	30.40	29.00	36.0	27	21	22
20 AT5 16 6F A 8	32.00	30.60	36.0	27	21	23
22 AT5 16 6F A 8	35.25	33.85	38.0	27	21	24
24 AT5 16 6F A 8	38.40	37.00	42.0	27	21	26
25 AT5 16 6F A 8	40.00	38.60	44.0	27	21	26
26 AT5 16 6F A 8	41.60	40.20	44.0	27	21	26
27 AT5 16 6F A 8	43.20	41.80	48.0	27	21	30
28 AT5 16 6F A 8	44.75	43.35	48.0	27	21	32
30 AT5 16 6F A 8	47.95	46.55	51.0	27	21	34
32 AT5 16 6F A 8	51.10	49.70	54.0	27	21	38
36 AT5 16 6F A 8	57.45	56.05	64.0	27	21	38
40 AT5 16 6F A 8	63.85	62.45	66.5	27	21	40
42 AT5 16 6F A 8	67.00	65.60	70.0	27	21	40
44 AT5 16 6  A 8	70.20	68.80	-	27	21	45
48 AT5 16 6  A 8	76.55	75.15	-	27	21	50
60 AT5 16 6  A 8	95.65	94.25	-	27	21	65
For 25mm Belt Widths
example of part number structure   12-AT5-25-6F-A-8 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
12 AT5 25 6F A 8	19.25	17.85	23.0	36	30	11
14 AT5 25 6F A 8	22.45	21.05	25.0	36	30	14
15 AT5 25 6F A 8	24.05	22.65	28.0	36	30	16
16 AT5 25 6F A 8	25.60	24.20	32.0	36	30	18
18 AT5 25 6F A 8	28.80	27.40	32.0	36	30	20
19 AT5 25 6F A 8	30.40	29.00	36.0	36	30	22
20 AT5 25 6F A 8	32.00	30.60	36.0	36	30	23
22 AT5 25 6F A 8	35.25	33.85	38.0	36	30	24
24 AT5 25 6F A 8	38.40	37.00	42.0	36	30	26
25 AT5 25 6F A 8	40.00	38.60	44.0	36	30	26
26 AT5 25 6F A 8	41.60	40.20	44.0	36	30	26
27 AT5 25 6F A 8	43.20	41.80	48.0	36	30	30
28 AT5 25 6F A 8	44.75	43.35	48.0	36	30	32
30 AT5 25 6F A 8	47.95	46.55	51.0	36	30	34
32 AT5 25 6F A 8	51.10	49.70	54.0	36	30	38
36 AT5 25 6F A 8	57.45	56.05	64.0	36	30	38
40 AT5 25 6F A 8	63.85	62.45	66.5	36	30	40
42 AT5 25 6F A 8	67.00	65.60	70.0	36	30	40
44 AT5 25 6  A 8	70.20	68.80	-	36	30	45
48 AT5 25 6  A 8	76.55	75.15	-	36	30	50
60 AT5 25 6  A 8	95.65	94.25	-	36	30	65

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AT10 Pitch
AT 5mm pitch x 16mm, 25mm, 32mm, and 50mm belt widths
Bore is ± 1 mm.
NOTE: ALL DIMENSIONS IN MILLIMETERS.  

For 16mm Belt Widths
example of part number structure   15-AT10-16-6F-A-8 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
15 AT10 16 6F A  8	47.90	45.90	51	31	21	32
16 AT10 16 6F A  8	51.05	49.05	54	31	21	35
18 AT10 16 6F A  8	57.45	55.45	60	31	21	40
19 AT10 16 6F A  8	60.60	58.60	66.5	31	21	44
20 AT10 16 6F A  8	63.80	61.80	66.5	31	21	46
22 AT10 16 6F A  8	70.15	68.15	75	31	21	52
24 AT10 16 6F A  8	76.55	74.55	83	31	21	58
25 AT10 16 6F A  8	79.70	77.70	83	31	21	60
26 AT10 16 6F A  8	82.90	80.90	87	31	21	60
27 AT10 16 6F A  8	86.10	84.10	91	31	21	60
28 AT10 16 6F A  8	89.25	87.25	93	31	21	60
30 AT10 16 6F A  8	95.65	93.65	97	31	21	60
32 AT10 16 6F A 10	102.00	100.00	106	31	21	65
36 AT10 16 6F A 10	114.75	112.75	119	31	21	70
40 AT10 16 6F A 10	127.45	125.45	131	31	21	80
44 AT10 16 6F A 10	140.20	138.20	-	31	21	88
48 AT10 16 6F A 10	152.95	150.95	-	31	21	95
60 AT10 16 6F A 10	191.10	189.10	-	31	21	110
For 25mm Belt Widths
example of part number structure   15-AT10-25-6F-A-8 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
15 AT10 25 6F A  8	47.90	45.90	51	40	30	32
16 AT10 25 6F A  8	51.05	49.05	54	40	30	35
18 AT10 25 6F A  8	57.45	55.45	60	40	30	40
19 AT10 25 6F A  8	60.60	58.60	66.5	40	30	44
20 AT10 25 6F A  8	63.80	61.80	66.5	40	30	46
22 AT10 25 6F A  8	70.15	68.15	75	40	30	52
24 AT10 25 6F A  8	76.55	74.55	83	40	30	58
25 AT10 25 6F A  8	79.70	77.70	83	40	30	60
26 AT10 25 6F A  8	82.90	80.90	87	40	30	60
27 AT10 25 6F A  8	86.10	84.10	91	40	30	60
28 AT10 25 6F A  8	89.25	87.25	93	40	30	60
30 AT10 25 6F A  8	95.65	93.65	97	40	30	60
32 AT10 25 6F A 10	102.00	100.00	106	40	30	65
36 AT10 25 6F A 10	114.75	112.75	119	40	30	70
40 AT10 25 6F A 10	127.45	125.45	131	40	30	80
44 AT10 25 6  A 10	140.20	138.20	-	40	30	88
48 AT10 25 6  A 10	152.95	150.95	-	40	30	95
60 AT10 25 6  A 10	191.10	189.10	-	40	30	110
For 32mm Belt Widths
example of part number structure   18-AT10-32-6F-A-10 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
18 AT10 32 6F A 10	57.45	55.45	60	47	37	40
19 AT10 32 6F A 10	60.60	58.60	66.5	47	37	44
20 AT10 32 6F A 12	63.80	61.80	66.5	47	37	46
22 AT10 32 6F A 12	70.15	68.15	75	47	37	52
24 AT10 32 6F A 12	76.55	74.55	83	47	37	58
25 AT10 32 6F A 12	79.70	77.70	83	47	37	60
26 AT10 32 6F A 12	82.90	80.90	87	47	37	60
27 AT10 32 6F A 12	86.10	84.10	91	47	37	60
28 AT10 32 6F A 12	89.25	87.25	93	47	37	60
30 AT10 32 6F A 12	95.65	93.65	97	47	37	60
32 AT10 32 6F A 12	102.00	100.00	106	47	37	65
36 AT10 32 6F A 16	114.75	112.75	119	47	37	70
40 AT10 32 6F A 16	127.45	125.45	131	47	37	80
44 AT10 32 6  A 16	140.20	138.20	-	47	37	88
48 AT10 32 6  A 16	152.95	150.95	-	47	37	95
60 AT10 32 6  A 16	191.10	189.10	-	47	37	110
For 50mm Belt Widths
example of part number structure   18-AT10-50-6F-A-10 # grooves - pitch - belt width - type - material - bore
PART NUMBER	Pitch Diam.	Pulley O.D.	Flange O.D. ±1/64	O.A.L	Face Width	Hub Diam. ±1/64
18 AT10 50 6F A 10	57.45	55.45	60	66	56	40
19 AT10 50 6F A 10	60.60	58.60	66.5	66	56	44
20 AT10 50 6F A 12	63.80	61.80	66.5	66	56	46
22 AT10 50 6F A 12	70.15	68.15	75	66	56	52
24 AT10 50 6F A 12	76.55	74.55	83	66	56	58
25 AT10 50 6F A 12	79.70	77.70	83	66	56	60
26 AT10 50 6F A 12	82.90	80.90	87	66	56	60
27 AT10 50 6F A 12	86.10	84.10	91	66	56	60
28 AT10 50 6F A 12	89.25	87.25	93	66	56	60
30 AT10 50 6F A 12	95.65	93.65	97	66	56	60
32 AT10 50 6F A 12	102.00	100.00	106	66	56	65
36 AT10 50 6F A 16	114.75	112.75	119	66	56	70
40 AT10 50 6F A 16	127.45	125.45	131	66	56	80
44 AT10 50 6  A 16	140.20	138.20	-	66	56	88
48 AT10 50 6  A 16	152.95	150.95	-	66	56	95
60 AT10 50 6  A 16	191.10	189.10	-	66	56	110

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part number configuration, definitions, and conversions

# Grooves

Use any suitable number of grooves. ex: 12 or 18

Pitch

RMA/MPTA Pitch Designation. .080" = MXL .200" = XL .375" = L .500" = H

Belt Width

Belt width expressed according to MPTA/RMA IP-24 standard. 3/8" = .375 = 037 1/2" = .500 = 050 1-1/2" = 1.500 = 150

Type

See drawings for type design. 6FC, 6F, 6, 6W, 3F, or 3

Material

Steel = S, or Aluminum = A

Bore

Bore dimensions expressed in decimal inches. 1/8" = .125 = 125 1/2" = .500 = 500 3/4" = .750 = 750