patented
C.R.T. (Constant Reaction Tensioner)
ROLLER CHAIN TENSIONERS

Commonly used chain tensioners give a tensioning force which is usually provided by a direct acting spring. Thus, when the chain is new and the tensioning force required is low, the spring is compressed and maximum force is provided; the contrary when the chain has "stretched" with use the spring expands and only minimum force is delivered. Regina Constant Reaction Tensioner (C.R.T.) solves this problem and delivers a virtual constant force by means of a unique compensating parallelogram principle. This means that the chain tensioning force (reaction) is effectively constant regardless of the position and length of the chain. This Regina design is patented. Regina C.R.T. is supplied for the chain types listed in the following pages. For each chain type there are three types of sliding block in special antifriction material. The choice depends upon the stroke required from the tensioner. For normal straight line usage model N° 45 is recommended.

CRT 1 TENSIONERS

			SLIDING BLOCK					TENSIONER							FORCE
CHAIN IS0 ref. Number	Regina Chain Number	Sliding Block	R	h	I	w	z	a	b	c	d	e	f	g
			mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
06 B1	121	45	170	73	106.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
06 B1	121	90	95	78	111.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
06 B1	121	180	62	98	131.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
06 C1	A35	45	170	73	106.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
06 C1	A35	90	95	78	111.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
06 C1	A35	180	62	98	131.5	4.2	10.5	38	26	6.5	16.5	9.2	38	53	6
08 B1	126	45	170	73	106.5	7	16	38	26	6.5	16.5	9.2	38	53	6
08 B1	126	90	95	78	111.5	7	16	38	26	6.5	16.5	9.2	38	53	6
08 B1	126	180	62	98	131.5	7	16	38	26	6.5	16.5	9.2	38	53	6
08A1	A40	45	170	73	106.5	7	16	38	26	6.5	16.5	9.2	38	53	6
08A1	A40	90	95	78	111.5	7	16	38	26	6.5	16.5	9.2	38	53	6
08A1	A40	180	62	98	131.5	7	16	38	26	6.5	16.5	9.2	38	53	6
10 B1	136	45	170	73	106.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
10 B1	136	90	95	78	111.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
10 B1	136	180	62	98	131.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
10 A1	A50	45	170	73	106.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
10 A1	A50	90	95	78	111.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
10 A1	A50	180	62	98	131.5	8.5	19	38	26	6.5	16.5	9.2	38	53	12
12 B1	140	45	170	73	106.5	11	19	38	26	6.5	16.5	9.2	38	53	12
12 B1	140	90	95	78	111.5	11	19	38	26	6.5	16.5	9.2	38	53	12
12 B1	140	180	62	98	131.5	11	19	38	26	6.5	16.5	9.2	38	53	12
12 A1	A60	45	170	73	106.5	11	19	38	26	6.5	16.5	9.2	38	53	12
12 A1	A60	90	95	78	111.5	11	19	38	26	6.5	16.5	9.2	38	53	12
12 A1	A60	180	62	98	131.5	11	19	38	26	6.5	16.5	9.2	38	53	12
06 B2	221	45	170	73	106.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
06 B2	221	90	95	78	111.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
06 B2	221	180	62	98	131.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
06 C2	A35-2	45	170	73	106.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
06 C2	A35-2	90	95	78	111.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
06 C2	A35-2	180	62	98	131.5	4.2	14	38	26	6.5	16.5	9.2	38	53	12
08 B2	226	45	170	73	106.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12
08 B2	226	90	95	78	111.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12
08 B2	226	180	62	98	131.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12
08 A2	A40-2	45	170	73	106.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12
08 A2	A40-2	90	95	78	111.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12
08 A2	A40-2	180	62	98	131.5	6.5	20	38	26	6.5	16.5	9.2	38	53	12

CRT 2 TENSIONERS

			SLIDING BLOCK					TENSIONER							FORCE
CHAIN IS0 ref. Number	Regina Chain Number	Sliding Block	R	h	I	w	z	a	b	c	d	e	f	g
			mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
16 B1	147	45	200	91	133	15	30	45	34	8.5	20	13	42	63	18
16 B1	147	90	100	93	135	15	30	45	34	8.5	20	13	42	63	18
16 B1	147	180	74	119	161	15	30	45	34	8.5	20	13	42	63	18
16 A1	A 80	45	200	91	133	15	30	45	34	8.5	20	13	42	63	18
16 A1	A 80	90	100	93	135	15	30	45	34	8.5	20	13	42	63	18
16 A1	A 80	180	74	119	161	15	30	45	34	8.5	20	13	42	63	18
20 B1	152	45	200	91	133	18	38	45	34	8.5	20	13	42	63	24
20 B1	152	90	100	93	135	18	38	45	34	8.5	20	13	42	63	24
20 B1	152	180	74	119	161	18	38	45	34	8.5	20	13	42	63	24
20 A1	A 100	45	200	91	133	18	38	45	34	8.5	20	13	42	63	24
20 A1	A 100	90	100	93	135	18	38	45	34	8.5	20	13	42	63	24
20 A1	A 100	180	74	119	161	18	38	45	34	8.5	20	13	42	63	24
10 B2	236	45	200	91	133	8	25.5	45	34	8.5	20	13	42	63	18
10 B2	236	90	100	93	135	8	25.5	45	34	8.5	20	13	42	63	18
10 B2	236	180	74	119	161	8	25.5	45	34	8.5	20	13	42	63	18
10 A2	A 50-2	45	200	91	133	8	25.5	45	34	8.5	20	13	42	63	18
10 A2	A 50-2	90	100	93	135	8	25.5	45	34	8.5	20	13	42	63	18
10 A2	A 50-2	180	74	119	161	8	25.5	45	34	8.5	20	13	42	63	18
12 B2	240	45	200	91	133	9.5	30	45	34	8.5	20	13	42	63	24
12 B2	240	90	100	93	135	9.5	30	45	34	8.5	20	13	42	63	24
12 B2	240	180	74	119	161	9.5	30	45	34	8.5	20	13	42	63	24
12 A2	A 60-2	45	200	91	133	9.5	30	45	34	8.5	20	13	42	63	24
12 A2	A 60-2	90	100	93	135	9.5	30	45	34	8.5	20	13	42	63	24
12 A2	A 60-2	180	74	119	161	9.5	30	45	34	8.5	20	13	42	63	24
16 B2	247	45	200	91	133	13.5	43.5	45	34	8.5	20	13	42	63	24
16 B2	247	90	100	93	135	13.5	43.5	45	34	8.5	20	13	42	63	24
16 B2	247	180	74	119	161	13.5	43.5	45	34	8.5	20	13	42	63	24
16 A2	A 80-2	45	200	91	133	13.5	43.5	45	34	8.5	20	13	42	63	24
16 A2	A 80-2	90	100	93	135	13.5	43.5	45	34	8.5	20	13	42	63	24
16 A2	A 80-2	180	74	119	161	13.5	43.5	45	34	8.5	20	13	42	63	24

CRT 0 TENSIONERS

			SLIDING BLOCK					TENSIONER							FORCE
CHAIN IS0 ref. Number	Regina Chain Number	Sliding Block	R	h	I	w	z	a	b	c	d	e	f	g
			mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
05 B1	105	60	90	61.5	95	2.7	16	38	24	6.5	16.5	9.2	28	53	8
05 B1	105	180	50	85	117.5	2.7	16	38	24	6.5	16.5	9.2	28	53	8
06 B1	121	60	90	61.5	95	4.2	16	38	24	6.5	16.5	9.2	28	53	8
06 B1	121	180	50	85	117.5	4.2	16	38	24	6.5	16.5	9.2	28	53	8
06 C1	A 35	60	90	61.5	95	4.2	16	38	24	6.5	16.5	9.2	28	53	8
06 C1	A 35	180	50	85	117.5	4.2	16	38	24	6.5	16.5	9.2	28	53	8
08 B1	126	60	90	61.5	95	7	16	38	24	6.5	16.5	9.2	28	53	8
08 B1	126	180	50	85	117.5	7	16	38	24	6.5	16.5	9.2	28	53	8
08 A1	A 40	60	90	61.5	95	7	16	38	24	6.5	16.5	9.2	28	53	8
08 A1	A 40	180	50	85	117.5	7	16	38	24	6.5	16.5	9.2	28	53	8
10 B1	136	60	90	61.5	95	8.5	16	38	24	6.5	16.5	9.2	28	53	8
10 B1	136	180	50	85	117.5	8.5	16	38	24	6.5	16.5	9.2	28	53	8
10 A1	A 50	60	90	61.5	95	8.5	16	38	24	6.5	16.5	9.2	28	53	8
10 A1	A 50	180	50	85	117.5	8.5	16	38	24	6.5	16.5	9.2	28	53	8
12 B1	140	60	90	61.5	95	11	16	38	24	6.5	16.5	9.2	28	53	8
12 B1	140	180	50	85	117.5	11	16	38	24	6.5	16.5	9.2	28	53	8
12 A1	A 60	60	90	61.5	95	11	16	38	24	6.5	16.5	9.2	28	53	8
12 A1	A 60	180	50	85	117.5	11	16	38	24	6.5	16.5	9.2	28	53	8
05 B2	205	60	90	61.5	95	2.5	8.2	38	24	6.5	16.5	9.2	28	53	8
05 B2	205	180	50	85	117.5	2.5	8.2	38	24	6.5	16.5	9.2	28	53	8
06 B2	221	60	90	61.5	95	4.2	14	38	24	6.5	16.5	9.2	28	53	8
06 B2	221	180	50	85	117.5	4.2	14	38	24	6.5	16.5	9.2	28	53	8
06 C2	A 35-2	60	90	61.5	95	4.2	14	38	24	6.5	16.5	9.2	28	53	8
06 C2	A 35-2	180	50	85	117.5	4.2	14	38	24	6.5	16.5	9.2	28	53	8
08 B2	226	60	90	61.5	95	6.6	20	38	24	6.5	16.5	9.2	28	53	8
08 B2	226	180	50	85	117.5	6.6	20	38	24	6.5	16.5	9.2	28	53	8
08 A2	A 40-2	60	90	61.5	95	6.6	20	38	24	6.5	16.5	9.2	28	53	8
08 A2	A 40-2	180	50	85	117.5	6.6	20	38	24	6.5	16.5	9.2	28	53	8
10 A2	236	60	90	61.5	95	8	25.5	38	24	6.5	16.5	9.2	28	53	8
10 A2	236	180	50	85	117.5	8	25.5	38	24	6.5	16.5	9.2	28	53	8
10 B2	A 50-2	60	90	61.5	95	8	25.5	38	24	6.5	16.5	9.2	28	53	8
10 B2	A 50-2	180	50	85	117.5	8	25.5	38	24	6.5	16.5	9.2	28	53	8

Note: ISO ref. numbers containing 'B' are for metric or british chain sizes,
while ISO ref. numbers containing 'A' are for american chain sizes.

---

---

Stress / Movement Diagram

[ To: REGINA General Chain catalog page]
[ To: REGINA Tool Holder Chain catalog page]