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Technical Specifications

Extrusion Rubber Tolerance Tables

There are four levels of dimensional tolerances that are used for molded rubber products.

"A1" High Precision
"A2" Precision
"A3" Commercial
"A4" Basic

Summary of Drawing Designations

Dimensional Tolerances (Tables 2-5)	Relative Dimensions	Finish (Table 6)	Flash Extension (Table 7)		Bonding (Specify Grade and Method on B1 and B2) (Tables 8 & 9)	Load-Deflection Characteristic (Specify only when needed) (Table 10)	Packaging (Table 11)
A1	No designation, see text and/or your rubber supplier. Specify only when needed.	F1	T.00mm	T.000	B1	D1	P1
A2		F2	T.08mm	T.003	B2	D2	P2
A3		F3	T.40mm	T.016	B3	D3	P3
A4		F4	T.80mm	T.032	B4	--	--
--		--	T1.60mm	T.063	B5	--	--
--		--	T2.35mm	T.093	--	--	--
--		--	T∞	T∞	--	--	--

Table 2 - Standard Dimensional Tolerance Table
Molded Rubber Products Drawing Designation “A1” High Precision

Size (mm)		Fixed	Closure	Size (inches)		Fixed	Closure
Above	Incl.			Above	Incl.
0	10	±.10	±.13	0	0.40	±.004	±.005
10	16	0.13	0.16	0.40	0.63	0.005	0.006
16	25	0.16	0.20	0.63	1.00	0.006	0.008
25	40	0.20	0.25	1.00	1.60	0.008	0.010
40	63	0.25	0.32	1.60	2.50	0.010	0.013
63	100	0.32	0.40	2.50	4.00	0.013	0.016
100	160	0.40	0.50	4.00	6.30	0.016	0.020

Table 3 - Standard Dimensional Tolerance Table
Molded Rubber Products Drawing Designation “A2” Precision

Size (mm)		Fixed	Closure	Size (inches)		Fixed	Closure
Above	Incl.			Above	Incl.
0	10	±.16	±.20	0	.40	±.006	±.008
10	16	0.20	0.25	.40	.63	0.008	0.010
16	25	0.25	0.32	.63	1.00	0.010	0.013
25	40	0.32	0.40	1.00	1.60	0.013	0.016
40	63	0.40	0.50	1.60	2.50	0.016	0.020
63	100	0.50	0.63	2.50	4.00	0.020	0.025
100	160	0.63	0.80	4.00	6.30	0.025	0.032
160	& over multiply by	0.004	0.005	6.30	& over multiply by	0.004	0.005

Table 4 - Standard Dimensional Tolerance Table
Molded Rubber Products Drawing Designation “A3” Commercial

Size (mm)		Fixed	Closure	Size (inches)		Fixed	Closure
Above	Incl.			Above	Incl.
0	10	±.20	±.32	0	.40	±.008	±.013
10	16	0.25	0.40	.40	.63	0.010	0.016
16	25	0.32	0.50	.63	1.00	0.013	0.020
25	40	0.40	0.63	1.00	1.60	0.016	0.025
40	63	0.50	0.80	1.60	2.50	0.020	0.032
63	100	0.63	1.00	2.50	4.00	0.025	0.040
100	160	0.80	1.25	4.00	6.30	0.032	0.050
160	& over multiply by	0.005	0.008	6.30	& over multiply by	0.005	0.008

Table 5 - Standard Dimensional Tolerance Table
Molded Rubber Products Drawing Designation “A4” Basic

Size (mm)		Fixed	Closure	Size (inches)		Fixed	Closure
Above	Incl.			Above	Incl.
0	10	±.32	±.80	0	.40	±.013	±.032
10	16	0.40	0.90	.40	.63	0.016	0.036
16	25	0.50	1.00	.63	1.00	0.020	0.040
25	40	0.63	1.12	1.00	1.60	0.025	0.045
40	63	0.80	1.25	1.60	2.50	0.032	0.050
63	100	1.00	1.40	2.50	4.00	0.040	0.056
100	160	1.25	1.60	4.00	6.30	0.050	0.063
160	& over multiply by	0.008	0.010	6.30	& over multiply by	0.008	0.010

Table 6 - Drawing Designation for Finish

Drawing Designation
F1	A smooth, polished and uniform finish completely free of tool marks, dents, nicks and scratches, as produced from a highly polished steel mold. In areas where F1 is specified, the mold will be polished to a surface finish of 10 microinches (250nm) or better.
F2	A uniform finish as produced from a polished steel mold. In areas where F2 is specified, the mold will be polished to a surface finish of 32 micro-inches (800nm) or better but with very small tool marks not polished out.
F3	Surfaces of the mold will conform to good machine shop practice and no micro-inch finish will be specified. This is “Commercial Finish”.
F4	Satin finish.

Table 7 - Drawing Designation for Flash Extension

Drawing Designation
T .00 mm	(T .000) No flash permitted on area designated. (Standard notation regarding other surfaces must accompany this notation.)
T .08 mm	(T .003) This tolerance will normally require buffing, facing, grinding or a similar operation.
T .40 mm	(T .016) This tolerance will normally require precision die trimming, buffing or extremely accurate trimming.
T .80 mm	(T .032) This tolerance will normally necessitate die trimming, machine trimming, tumbling, hand trimming, or tear trimming.
T 1.60 mm	(T .063) This would be the normal tear trim tolerance.
T 2.35 mm	(T .093) This tolerance will normally require die trimming, tear trimming, or hand trimming of some type.
T∞	(T ∞) No flash limitation.

Table 8 - Drawing Designation for Rubber-To-Metal Adhesion Classification

Drawing Designation
B1 (Specify method and grade from Table 9.)	Production 100% tested to 70% of the minimum destruction values as noted in Table 9, Method A only. In addition, sample parts tested to destruction must exceed the minimum destruction values as noted inTable 9. (Specify Method A or Method B and Grade.)
B2 (Specify method and grade from Table 9.)	Sample parts tested to destruction must exceed the minimum destruction values as noted in Table 9.
B3	Rubber to be adhered to metal. This designation would ordinarily be used on products where adhesion is not critical to product function.
B4	Mechanical attachment only. Rubber is not adhered to metal.
B5	Products requiring special consideration.

Table 9 - Drawing Designation for Minimum Adhesion Destruction Values

Method A
Drawing Designation	S.I. Metric Units		USA Customary Units
Grade 1	2.8 MPa		400 psi
	1.75 MPa	For rubber compounds over 10.5 MPa (1500 psi) tensile strength and 50 or greater hardness (SHORE “A”)	250 psi
Grade 2
	1.4 MPa	For rubber compounds under 10.5 MPa (1500 psi) tensile strength or under 50 hardness (SHORE “A”)	200 psi
Grade 3	0.35 MPa		50 psi
Method B
Drawing Designation	S.I. Metric Units		USA Customary Units
Grade 1	16 KN/m width		90 lbs./in. width
	9 KN/m width	For rubber compounds over 10.5 MPa (1500 psi) tensile strength and 50 or greater hardness (SHORE “A”)	50 lbs./in. width
Grade 2
	7 KN/m width	For rubber compound sunder 10.5 MPa (1500 psi) tensile strength or under 50 hardness (SHORE “A”)	40 lbs./in. width
Grade 3	2.7 KN/m width		15 lbs./in. width

Table 10 - Drawing Designations for Load-Deflection Tolerance

Drawing Designation	Durometer Hardness	Tolerance Range Rubber Wall Thickness 6mm (0.25 in.) or over	Tolerance Range Rubber Wall Thickness under 6mm (0.25 in.)
D1	65 Durometer Hardness (Shore A) or below	±10%	±15%	Very high precision. This close tolerance should only be requested in unusual circumstances.
D1	Above 65 Durometer Hardness (Shore A)	±15%	±20%
D2	65 Durometer Hardness (Shore A) or below	±11% to ±14%	±16% to ±20%	Precision
D2	Above 65 Durometer Hardness (Shore A)	±16% to ±19%	±21% to ±26%	Precision
D3	65 Durometer Hardness (Shore A) or below	±15%	±20%	Commercial
D3	Above 65 Durometer Hardness (Shore A)	±20%	±25%	Commercial

Table 11 - Packaging

Drawing Designation
P1	This class of product will be packaged to eliminate all possible distortion during transportation and storage. This may require special boxes, cartons, forms, cores, inner liners, or other special methods.
P2	This class of product will be packaged in corrugated containers or boxes. The quantity of the product packaged per container will be held to an amount which will not crush the lower layers from its own weight, but no forms, cores, inner liners, etc., are necessary.
P3	This class of product will be packaged in corrugated paper containers, boxes, crates, burlap bags or bundles, or on skids and pallets. This is the most economical method of packaging but may also produce the greatest distortion in the product.

Table 12 - Summary of Drawing Designations - Extruded Rubber Products

Class	Dimensional Tolerance* Table 13	Finish Table 14	Formed Tubing Table 15	Cut Length Tolerance* Table 16	Angle Cut Tolerance Table 17	Spliced Length Tolerance Table 18
1	E1	F1	H1	L1	AG1	S1
2	E2	F2	H2	L2	AG2	S2
3	E3	F3	H3	L3	AG3	S3
4	--	F4	H4	--	--	--
Class	*Ground Surface Table 19**	*Mandrel Cured Table 20**	T.I.R. Table 21	*Ground Tubing Tolerance Table 22**	Packaging Table 23
1	EG1	EN1	K1	EW1	P1
2	EG2	EN2	K2	EW2	P2
3	--	EN3	--	--	P3
4	--	--	--	--	--

TABLE 13 - STANDARDS FOR CROSS SECTIONAL TOLERANCE TABLE

Class		1 High Precision	2 Precision	3 Commercial
Drawing Designation		E1	E2	E3
Dimensions (in Millimeters)
Above	Up to
0	1.5	±0.15	±0.25	±0.40
1.5	2.5	0.20	0.35	0.50
2.5	4.0	0.25	0.40	0.70
4.0	6.3	0.35	0.50	0.80
6.3	10.0	0.40	0.70	1.00
10.0	16.0	0.50	0.80	1.30
16.0	25.0	0.70	1.00	1.60
25.0	40.0	0.80	1.30	2.00
40.0	63.0	1.00	1.60	2.50
63.0	100.0	1.30	2.00	3.20
RMA Class		1 High Precision	2 Precision	3 Commercial
Drawing Designation		E1	E2	E3
Dimensions (in Inches)
Above	Up to
0.00	0.06	±0.006	±0.010	±0.015
0.06	0.10	0.008	0.014	0.020
0.10	0.16	0.010	0.016	0.027
0.16	0.25	0.014	0.020	0.031
0.25	0.39	0.016	0.027	0.039
0.39	0.63	0.020	0.031	0.051
0.63	0.98	0.027	0.039	0.063
0.98	1.57	0.031	0.051	0.079
1.57	2.48	0.039	0.063	0.098
2.48	3.94	0.051	0.079	0.126

Table 14 - Drawing Designation for Extrusion Finish

Class	Drawing Designation
1	F1	Product shall have surface finish smooth, clean and free from any foreign matter.
2	F2	Product shall have surface finish cleaned of dust and foreign matter but slight streaks or spots acceptable.
3	F3	Product shall have loose dust and foreign matter removed but natural finish (not washed) acceptable.
4	F4	Product shall be acceptable with no cleaning necessary. Dust or solution deposits acceptable. Coarse or grainy surface acceptable.

Table 15 - Drawing Designation for Formed Tubing

Class	Drawing Designation
1	H1	Product to be furnished to minimum wall thickness specified and maintained throughout. Ends to be trimmed true and even.
2	H2	Product to be furnished to general cross section with stretched or thinner wall acceptable at bends or radii. Otherwise, same as Class 1.
3	H3	Product may be furnished partially out of round in straight or bent sections. Ends may not necessarily be straight and true. Minor flat spots permissible.
4	H4	Product may be furnished partially out of round in straight or bent sections. Flat spots and slight wrinkles or buckles permissible. Product may be cut to length in unvulcanized state. (Allow 12.3mm (.500 in.) for every 750mm (30 in.) of length.) Special tolerance to be established between supplier and purchaser.

Table 16 - Cut Length Tolerance Table for Unspliced Extrusion

Class		1 (Precision)	2 (Commercial)	3 (Non-Critical)
Drawing Designation		L1	L2	L3
Length (in Millimeters)
Above	Up to
0	40	±0.7	±1.0	±1.6
40	63	0.8	1.3	2.0
63	100	1.0	1.6	2.5
100	160	1.3	2.0	3.2
160	250	1.6	2.5	4.0
250	400	2.0	3.2	5.0
400	630	2.5	4.0	6.3
630	1000	3.2	5.0	10.0
1000	1600	4.0	6.3	12.5
1600	2500	5.0	10.0	16.0
2500	4000	6.3	12.5	20.0
4000		0.16%	0.32%	0.50%
Length (in Inches)
Above	Up to
0	1.6	±0.03	±0.04	±0.06
1.6	2.5	0.03	0.05	0.08
2.5	4.0	0.04	0.06	0.10
4.0	6.3	0.05	0.08	0.13
6.3	10.0	0.06	0.10	0.16
10.0	16.0	0.08	0.13	0.20
16.0	25.0	0.10	0.16	0.25
25.0	40.0	0.13	0.20	0.40
40.0	63.0	0.16	0.25	0.50
63.0	100.0	0.20	0.40	0.63
100.0	160.0	0.25	0.50	0.80
160.0		0.16%	0.32%	0.50%

STANDARDS FOR ANGLE CUT TOLERANCES FOR EXTRUSIONS

Class	Drawing Designation	Cut (Max)
Precision	AG1	4°
Commercial	AG2	6°
Non-Critical	AG3	10°

Table 18 - Spliced Length Tolerances

Drawing Designations		1 Precision	2 Commercial	3 Non-Critical
Millimeters
Above	- Up to	S1	S2	S3
0	250	±3.2	±6.3	±7.1
250	400	4.0	7.1	8.0
400	630	5.0	8.0	9.0
630	1000	6.3	9.0	10.0
1000	1600	8.0	10.0	11.2
1600	2500	10.0	11.2	12.3
2500	- over	12.5	12.5	16.0
Inches
Above	Up to
0	10	±.13	±.25	±.28
10	16	0.16	0.28	0.32
16	25	0.20	0.32	0.36
25	40	0.25	0.36	0.40
40	63	0.32	0.40	0.45
63	100	0.40	0.45	0.50
100	- over	0.50	0.50	0.53

Table 19 - Tolerances on Outside Dimensions of Surface-Ground Extrusions

Class		1 (Precision)	2 (Commercial)
Drawing Designation		EG1	EG2
Dimensions (In Millimeters)
Above	Up to
5	10	±0.15	±0.25
10	16	0.20	0.35
16	25	0.20	0.40
25	40	0.25	0.50
40	63	0.35	0.70
63	100	0.40	0.80
100	160	0.50	1.00
160		0.3%	0.6%
Dimensions (In Inches)
Above	Up to
0.20	0.40	±0.006	±0.010
0.40	0.63	0.008	0.014
0.63	1.00	0.008	0.016
1.00	1.60	0.010	0.020
1.60	2.50	0.014	0.028
2.50	4.00	0.016	0.032
4.00	6.30	0.020	0.040
6.30		0.3%	0.6%

Table 20 - Tolerances on Internal Dimensions of Mandrel-Supported Extrusions

Class		1 (Precision)	2 (Commercial)	3 (Non-Critical)
Drawing Designation		EN1	EN2	EN3
Dimensions (in Millimeters)
Above	Up to
0	4	±0.20	±0.20	±0.35
4	6.3	0.20	0.25	0.40
6.3	10	0.25	0.35	0.50
10	16	0.35	0.40	0.70
16	25	0.40	0.50	0.80
25	40	0.50	0.70	1.00
40	63	0.70	0.80	1.30
63	100	0.80	1.00	1.60
100	160	1.00	1.30	2.00
160		0.6%	0.8%	1.2%
Dimensions (in Inches)
Above	Up to
0	0.16	±0.008	±0.008	±0.014
0.16	0.25	0.008	0.010	0.016
0.25	0.40	0.010	0.014	0.020
0.40	0.63	0.014	0.016	0.028
0.63	1.00	0.016	0.020	0.032
1.00	1.60	0.020	0.028	0.040
1.60	2.50	0.028	0.032	0.051
2.50	4.00	0.032	0.040	0.063
4.00	6.30	0.040	0.051	0.079
6.30		0.6%	0.8%	1.2%

Table 21 - T.I.R. Tolerances

Class		1 (Precision)	2 (Commercial)
Drawing Designation		K1	K2
O.D. (In Millimeters)
Above	Up to
0	13	0.20	0.40
13	20	0.25	0.50
20	32	0.33	0.75
32	50	0.47	1.15
50	80	0.50	1.65
80	Over	0.64	2.30
O.D. (In Inches)
Above	Up to
0.0	0.5	0.008	0.015
0.5	0.8	0.010	0.020
0.8	1.25	0.013	0.030
1.25	2.00	0.016	0.045
2.00	3.15	0.020	0.065
3.15	Over	0.025	0.090

Table 22 - Tolerances on Wall Thickness of Surface-Ground Extrusions

Class		1 (Precision)	2 (Commercial)
Drawing Designation		EW1	EW2
Nominal Dimension (In Millimeters)
Above	Up to
0.0	4.0	±0.10	±0.20
4.0	6.3	0.15	0.20
6.3	10.0	0.20	0.25
10.0	16.0	0.20	0.35
16.0	25.0	0.25	0.40
Nominal Dimension (In Inches)
Above	Up to
0.0	0.16	±0.004	±0.008
0.16	0.25	0.006	0.008
0.25	0.40	0.008	0.010
0.40	0.63	0.008	0.014
0.63	1.00	0.010	0.016

Table 23 - Extrusion Packaging

Class	Drawing Designation
1	P1	This class of product will be packaged to eliminate all possible distortion during transportation and storage. This may require special boxes, cartons, forms, cores, inner liners, or other special methods.
2	P2	This class of product will be packaged in corrugated containers or boxes. The quantity of the product packaged per container will be held to an amount which will not crush the lower layers from its own weight, but no forms, cores, inner liners, etc. are necessary.
3	P3	This class of product will be packaged in corrugated paper containers, boxes, crates, burlap bags or bundles, or on skids and pallets. This is the most economical method of packaging but may also produce the greatest distortion in the product.

Table 24 - Lathe Cut Tolerances - Inside Diameter Tolerance

Drawing Designation		C1	C2	C3
Class		Precision	Commercial	Non-Critical
I.D. (in Millimeters)
Above	Included
5.08	17.78	±.13	±.18	±.25
17.78	38.10	0.15	0.25	0.38
38.10	66.04	0.25	0.38	0.64
66.04	127.00	0.38	0.64	1.27
127.00	177.80	0.64	0.89	1.78
177.80	228.60	0.76	1.14	2.29
228.60	304.80	1.02	1.52	2.54
I.D. (in Inches)
Above	Included
0.200	0.700	±.005	±.007	±.010
0.700	1.500	0.006	0.010	0.015
1.500	2.600	0.010	0.015	0.025
2.600	5.000	0.015	0.025	0.050
5.000	7.500	0.025	0.035	0.070
7.500	9.000	0.040	0.060	0.100
9.000	12.000	0.050	0.075	0.125

Cut Thickness Tolerance
Drawing Designation		C1	C2	C3
RMA Class		Precision	Commercial	Non-Critical
Cut (TK) (in Millimeters)
Above	Included
0.38	5.08	±.10	±.13	±---
5.08	10.16	0.15	0.25	0.38
10.16	12.70	0.18	0.38	0.76
12.70	15.24	0.20	0.51	1.14
15.24	17.78	0.23	0.64	1.52
17.78	25.40	0.25	0.76	1.91
Cut (TK) (in Inches)
Above	Included
0.015	0.200	±.004	±.005	±---
0.200	0.400	0.006	0.010	0.015
0.400	0.500	0.007	0.015	0.030
0.500	0.600	0.008	0.020	0.045
0.600	0.700	0.009	0.025	0.060
0.700	1.000	0.010	0.030	0.075
0.76	5.08	±.10	±.18	±---
5.08	7.62	0.13	0.25	0.38
7.62	12.70	0.18	0.38	0.51
Wall (W) (in Inches)
Above	Included
0.030	0.200	±.004	±.007	±---
0.200	0.300	0.005	0.010	0.015
0.300	0.500	0.007	0.015	0.020

Table 25 - O.D. Tolerance (Measured on Fixed Mandrel)

Drawing Designation		C1	C2	C3
Class		Precision	Commercial	Non-Critical
Wall Thickness (mm)
Above	Included
0.76	5.08	±.13	±.20	±.38
5.08	7.62	0.20	0.30	0.51
7.62	& over	0.25	0.38	0.64
Wall Thickness (in.)
Above	Included
0.030	0.200	±.005	±.008	±.015
0.200	0.300	0.008	0.012	0.020
0.300	& over	0.010	0.015	0.025

Table 26 - Standards for Total Indicator Reading (T.I.R.) Tolerance (Concentricity*)

Drawing Designation		C1	C2
Class		Precision	Commercial
Inside Diameter (I.D.) (mm)
Above	Included
----	12.70	0.20	0.20
12.70	25.40	0.20	0.25
25.40	50.80	0.20	0.33
50.80	& over	0.20	0.41
Inside Diameter (I.D.) (in.)
Above	Included
----	0.500	0.008	0.008
0.500	1.000	0.008	0.010
1.000	2.000	0.008	0.013
2.000	& over	0.008	0.016

Table 27 - Design Chart

AS 568 A Dash No.	Nom Cross Section	Actual Cros Section W x TK	Gland Depth	Gland Width	Inside Radius Max.	Clearance Gap Max.	Squeeze
AS 568 A Dash No.	Nom Cross Section	Actual Cros Section W x TK	Gland Depth	Gland Width	Inside Radius Max.	Clearance Gap Max.	Min.	Mean	Max.
	Dimensions in mm		+.00	+.13
	Dimensions in mm		-0.05	-0.13
000 - 050	1.59	1.68 x 1.68	1.44	2.51	0.38	0.05	0.13	0.25	0.38
106 - 178	2.38	2.51 x 2.51	2.29	3.71	0.38	0.06	0.13	0.25	0.38
201 - 284	3.18	3.40 x 3.40	3.11	4.90	0.64	0.08	0.19	0.32	0.44
309 - 387	4.76	5.16 x 5.16	4.75	7.19	0.76	0.09	0.28	0.43	0.58
425 - 465	6.35	6.73 x 6.73	6.10	9.65	0.76	0.13	0.51	0.66	0.08
	Dimensions in in.		+.000	+.005
	Dimensions in in.		-0.002	-0.005
000 - 050	1/16”	.066 x .066	0.057	0.099	0.015	0.002	0.005	0.010	0.015
106 - 170	3/32”	.099 x .099	0.090	0.146	0.015	0.0025	0.005	0.010	0.015
201 - 284	1/8”	.134 x .134	0.1225	0.193	0.025	0.003	0.0075	0.0125	0.0175
309 - 387	3/16”	.203 x .203	0.187	0.286	0.030	0.0035	0.011	0.017	0.023
425 - 465	1/4”	.265 x .265	0.240	0.380	0.030	0.005	0.020	0.026	0.032

CLOSED
	OPEN CELL DIE-CUTOpen or closedcell molded			CLOSED CELL		CLOSED CELLDIE-CUTSheet or Strip
					CELL
				SILICONE
					SILICONE
				Molded
					Extruded
		Length &		Length &		ThicknessTable 34	Length &WidthTable 35
	Thickness		Thickness		Cross Section
RMA Class		Width		Width
	Table 30		Table 32		Table 33
		Table 31		Table 32
A						BTH A
1	ATH 1	AL 1				BTH 1	BL 1
2	ATH 2	AL 2				BTH 2	BL 2
3	ATH 3	AL 3	STH 3	SL 3	SEC-3	BTH 3	BL 3
4	ATH 4	AL 4
				Drawing Designation for Other Standards
	Finish		Surface	Splice		Trim	Packaging
RMA Class
	Table 42		Table 43	Table 44		Table 45	Table 46
A	F A
1	F 1		R 1	S 1		T1	P1
2	F 2		R 2	S 2		T2	P2
3	F 3		R 3	S 3		T3	P3
4						T4	P4
5						T5
							SPONGE/DENSE
	CLOSED CELL EXTRUDED				CLOSED CELL TUBING
							EXTRUDED
	Rectangular and		All Lengths
Irregular and Cored
	Regular Cross			Inside Diameter		Wall Thickness	Length
Cross Section
	Section		Length	Table 39		Table 40	Table 41
Table 36
	Table 37		Table 38
BEC 1	BER 1		BEL 1	BET 1		BEW 1	SDL 1
BEC 2	BER 2		BEL 2	BET 2		BEW 2	SDL 2
BEC 3	BER 3		BEL 3	BET 3		BEW 3	SDL 3

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