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Keener Rubber Company
            Keener produces all our rubber bands from the highest grade of natural and synthetic rubber available

 

 

 
FORMULA FOR CALCULATING THE FLAT LENGTH OF A BAND
	INSIDE DIAMETER x 3.1417
   ----------------------------------	= FLAT LENGTH
   		2
FORMULA TO FIND THE DIAMETER OF A CIRCLE
	CIRCUMFERENCE X 0.31813
FORMULA TO FIND THE CIRCUMFERENCE OF A CIRCLE
	DIAMETER X 3.1416

FORMULA TO CONVERT FLAT LENGTH TO  INSIDE DIAMETER
		FLAT LENGTH 
	-------------------------  = INSIDE DIAMETER
		1.5709

1 kilogram = 2.2046 pounds

1 pound = 0.4536 kg

1 millimeter = 0.0394 inch

1 inch = 2.54 centimeters

1 centimeter = 0.3937 inch

1 inch = 25.4001 mm

	Millimeter Size Conversion Chart
	(European Size Chart)
Size		Lay Flat Length		Inner Diameter
		mm	inches		mm	inches
7		20	 3/4		11	1/2
9		25	1		16	5/8
10		35	1 1/4		22	7/8
11		40	1 1/2		25	1
13		45	1 3/4		29	1 1/8
14		50	2		32	1 1/4
16		60	2 1/2		38	1 1/2
162		64	2		41	1 5/8
17		70	2 3/4		45	1 3/4
18		76	3		48	1 7/8
182		80	3 1/8		51 	2
19		87	3 1/2		55	2 1/8
20		100	4		64	2 1/2
22		120	4 3/4		76	3
23		140	5 1/2		89	3 1/2
24		160	6 1/4		102	4
25		180	7		115	4 1/2
108		200	8		127	5
220		220	8 3/4		140	5 1/2
240		240	9 1/2		153	6
250		250	10		159	6 1/4
Fraction	Decimal	MM		Fraction	Decimal	MM
1/64		.015625			33/64		.515625
1/32		.031250					.511810	13
		.039370	1		17/32		.531250
3/64		.046975			35/64		.546875
1/16		.062500					.551180	14
5/64		.078125			9/16		.562500
		.078740	2		37/64		.578125
3/32		.093750					.590550	15
7/64		.109375			19/32		.593750
		.118110	3		39/64		.609375
1/8		.125000			5/8		.625000
9/64		.140625					.629920	16
5/32		.156250			41/64		.640625
		.157480	4		21/32		.656250
11/64		.171875					.669290	17
3/16		.187500			43/64		.671875
		.196850	5		11/16		.687500
13/64		.203125			45/64		.703125
7/32		.218750					.708660	18
15/64		.234375			23/32		.718750
		.236220	6		47/64		.734375
1/4		.250000					.748030	19
17/64		.265625			3/4		.750000
		.275590	7		49/64		.765625
9/32		.281250			25/32		.781250
19/64		.296875					.787400	20
5/16		.312500			51/64		.796875
		.314960	8		13/16		.812500
21/64		.328125					.826770	21
11/32		.343750			53/64		.828125
		.354330	9		27/32		.843750
23/64		.359375			55/64		.859375
3/8		.375000					.861400	22
25/64		.390625			7/8		.875000
		.393700	10		57/64		.890625
13/32		.406250					.905510	23
27/64		.421875			29/32		.906250
		.433070	11		59/64		.921875
7/16		.437500			15/16		.937500
29/64		.453125					.944880	24
15/32		.468750			61/64		.953125
		.472440	12		31/32		.968750
31/64		.484375					.984250	25
1/2		.50000			63/64		.984375
Decimal Equivalents of Millimeters
mm	inches	mm	inches	mm	inches	mm	inches
25	.98425	44	1.73228	63	2.48031	82	3.22834
26	1.02362	45	1.77165	64	2.51968	83	3.26771
27	1.06299	46	1.81102	65	2.55905	84	3.30708
28	1.10236	47	1.85039	66	2.59842	85	3.34645
29	1.14173	48	1.88796	67	2.63779	86	3.38582
30	1.18110	49	1.92913	68	2.67716	87	3.42519
31	1.22047	50	1.96850	69	2.71653	88	3.46456
32	1.25894	51	2.00787	70	2.75590	89	3.50393
33	1.29921	52	2.04724	71	2.79527	90	3.54330
34	1.33858	53	2.08661	72	2.83464	91	3.58267
35	1.37795	54	2.12598	73	2.87401	92	3.62204
36	1.41732	55	2.16535	74	2.91338	93	3.66141
37	1.45669	56	2.20472	75	2.95275	94	3.70078
38	1.49606	57	2.24409	76	2.99212	95	3.74015
39	1.53543	58	2.28346	77	3.03149	96	3.77952
40	1.57480	59	2.32283	78	3.07086	97	3.81889
41	1.61417	60	2.36220	79	3.11023	98	3.85826
42	1.65354	61	2.40157	80	3.14960	99	3.89763
43	1.69291	62	2.44094	81	3.18897	100	3.93700
 
 

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Copyright 2000 Keener Rubber Company, Inc.
Last modified: January 31, 2000