Sprocket (pre-drilled for taper bush) KR20B-1-Z021-2517

Designation	Dimension	Remark
z	21	number of teeth
p_t	1" 1/4 31.75 mm	Pitch (inch) - Dimensions for roller chain Pitch (metric) - Dimensions for roller chain
b₁	3/4 19.56 mm	Internal width (inch) - Dimensions for roller chain Internal width (metric) - Dimensions for roller chain
d₁	19.05 mm	Roller diameter - Dimensions for roller chain
D_k	228.20 mm	Tip diameter (gearing)
D_t	213.04 mm	Pitch circle diameter (gearing)
D_n	140.00 mm	Hub diameter
D	25.00 mm	Diameter of pilot hole
L	55.00 mm	overall length
C	3.50 mm	Radius width
r	32.00 mm	Gear radius
Z_b	18.50 mm	Tooth width

Designation	Dimension	Remark

Designation	Dimension											Roller chain
	z	D_k	D_t	D_n	D	L	r	C	Z_b	h₂	h₃	p		b₁		d₁
		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	inch	mm	inch	mm
KR20B-1-Z013-2012	13	147,80	132,65	98,00	20,00	45,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z014-2012	14	157,80	142,68	108,00	20,00	45,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z015-2517	15	167,90	152,72	118,00	20,00	45,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z016-2517	16	177,90	162,75	120,00	25,00	50,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z017-2517	17	187,90	172,76	120,00	25,00	50,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z018-2517	18	198,00	182,85	120,00	25,00	50,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z019-2517	19	208,10	192,91	120,00	25,00	50,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z020-2517	20	218,10	202,95	120,00	25,00	50,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z021-2517	21	228,20	213,04	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z022-2517	22	238,30	223,11	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z023-2517	23	248,30	233,17	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z024-2517	24	258,40	243,23	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z025-2517	25	268,50	253,33	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z027-3020	27	288,60	273,48	150,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z030-3020	30	318,90	303,75	150,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z038-3020	38	399,60	384,49	150,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z045-3020	45	-	-	-	-	-	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z057-3020	57	-	-	-	-	-	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z076-3020	76	-	-	-	-	-	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05

Designation	Dimension											Roller chain
	z	D_k	D_t	D_n	D	L	r	C	Z_b	h₂	h₃	p		b₁		d₁
		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	inch	mm	inch	mm
KR20B-1-Z021	21	228,20	213,04	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-1-Z021-2517	21	228,20	213,04	140,00	25,00	55,00	32,00	3,50	18,50	-	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-2-Z021	21	228,20	213,04	140,00	25,00	80,00	32,00	3,50	18,20	54,60	-	31,75	1" 1/4	19,56	3/4"	19,05
KR20B-3-Z021	21	228,20	213,04	140,00	25,00	115,00	32,00	3,50	18,20	-	91,00	31,75	1" 1/4	19,56	3/4"	19,05

Accessories have been identified for this product that require calculation or other parameters that are unknown to us for your application.
Identified accessories: Taper bush 2517. You can find a selection of them here.

Type	Designation	Brand	Full designation
20B-1	Roller chain (Simplex)	HFH	Roller chain (Simplex) 20B-1

Name	Brand	Webshop	Notice
KR20B-1-Z021-2517	HFH		Premium quality, house brand

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