Radial shaft seal (gufera) reference

A technical reference for radial shaft seals (oil seals / gufera): the DIN 3760 construction types and industry codes, lip materials with their temperature and surface-speed limits, the shaft and housing requirements, and a table of common standard dimensions. Reference only — there are no products or prices on this page.

Pick the construction type, choose the lip material for the temperature and speed, then verify the shaft and housing meet the operating limits. The dimension table lists common standard sizes in the d1 (shaft) × d2 (bore) × b (width) form.

Seal types

DIN 3760 construction forms with their closest industry trade code. The suffix logic: no suffix = with garter spring, S = with dust lip, O = springless, D = two main lips.

DIN type	Industry code	Main lips	Dust lip	OD construction	Spring	Description
A	SC	1	No	Rubber-covered	Yes	Most common general-purpose seal; rubber-covered OD seals even an imperfect aluminium bore.
AS	TC	1	Yes	Rubber-covered	Yes	Type A plus a dust lip (S = Schutzlippe). The globally most common type (TC) — general industrial + automotive.
B	SB	1	No	Metal	Yes	Bare metal OD (single case); press-fit, requires a precise steel bore.
BS	TB	1	Yes	Metal	Yes	Type B plus a dust lip.
C	SA	1	No	Double metal case	Yes	Double metal case for higher rigidity; large diameters (= Simmerring® B2).
CS	TA	1	Yes	Double metal case	Yes	Type C plus a dust lip.
AD	—	2	No	Rubber-covered	Yes	Two MAIN lips (separate two media) with a rubber OD — not a dust-lip design.
BD	—	2	No	Metal	Yes	Two MAIN lips (separate two media) with a metal OD — not a dust-lip design.
AO	VC	1	No	Rubber-covered	No	Springless rubber-OD seal; grease / light-duty only, or as an auxiliary scraper.
BO	—	1	No	Metal	No	Springless metal-OD seal; grease / light-duty only.

A
SC
Main lips
1
Dust lip
No
OD construction
Rubber-covered
Spring
Yes
Most common general-purpose seal; rubber-covered OD seals even an imperfect aluminium bore.
AS
TC
Main lips
1
Dust lip
Yes
OD construction
Rubber-covered
Spring
Yes
Type A plus a dust lip (S = Schutzlippe). The globally most common type (TC) — general industrial + automotive.
B
SB
Main lips
1
Dust lip
No
OD construction
Metal
Spring
Yes
Bare metal OD (single case); press-fit, requires a precise steel bore.
BS
TB
Main lips
1
Dust lip
Yes
OD construction
Metal
Spring
Yes
Type B plus a dust lip.
C
SA
Main lips
1
Dust lip
No
OD construction
Double metal case
Spring
Yes
Double metal case for higher rigidity; large diameters (= Simmerring® B2).
CS
TA
Main lips
1
Dust lip
Yes
OD construction
Double metal case
Spring
Yes
Type C plus a dust lip.
AD
—
Main lips
2
Dust lip
No
OD construction
Rubber-covered
Spring
Yes
Two MAIN lips (separate two media) with a rubber OD — not a dust-lip design.
BD
—
Main lips
2
Dust lip
No
OD construction
Metal
Spring
Yes
Two MAIN lips (separate two media) with a metal OD — not a dust-lip design.
AO
VC
Main lips
1
Dust lip
No
OD construction
Rubber-covered
Spring
No
Springless rubber-OD seal; grease / light-duty only, or as an auxiliary scraper.
BO
—
Main lips
1
Dust lip
No
OD construction
Metal
Spring
No
Springless metal-OD seal; grease / light-duty only.

Materials & limits

Lip materials with their oil-seal-grade continuous temperature range, peak temperature and maximum lip surface (sliding) speed. Chemical compatibility is covered by the separate compatibility chart.

Code	Material	Continuous range	Peak	Max surface speed	Note
NBR	Nitrile (NBR)	-40 to 100 °C	120 °C	12 m/s	Default / standard. Mineral oils, hydraulics, greases, water; weak ozone/UV resistance; cheapest. Surface speed 10–12 m/s.
FKM	Fluoroelastomer (FKM / FPM, Viton®)	-20 to 200 °C	220 °C	38 m/s	Hot engines, gearboxes, fuels, aggressive media; more expensive. Surface speed 35–38 m/s.
VMQ	Silicone (VMQ / MVQ)	-60 to 180 °C	200 °C	6 m/s(approx.)	Widest temperature range; absorbs lubricant (lower lip wear); poor abrasion/tear resistance; NOT for fuels or mineral oils. Low dynamic speed (~4–6 m/s, conservative — verify vs SKF CR / Freudenberg).
ACM	Polyacrylate (ACM)	-25 to 150 °C	—	8 m/s(approx.)	Hot engine oil, EP gear oils (sulphur); poor water / low-temperature performance. Speed ~6–10 m/s (conservative — verify vs SKF CR / Freudenberg).
PTFE	PTFE (Teflon®)	-80 to 200 °C	—	40 m/s	Lowest friction; dry-running capable; needs a harder/smoother shaft + higher fitting force; carbon/graphite-filled variants. Standard lip 40–45 m/s; purpose-built high-speed PTFE designs reach much higher (design-dependent, not a single catalogue figure).
HNBR	Hydrogenated nitrile (HNBR)	-40 to 150 °C	175 °C	12 m/s(approx.)	Better heat/ozone resistance than NBR; H2S; turbo/compressor. Speed roughly NBR or slightly more (verify).

NBR
Nitrile (NBR)
Continuous range
-40 to 100 °C
Peak
120 °C
Max surface speed
12 m/s
Default / standard. Mineral oils, hydraulics, greases, water; weak ozone/UV resistance; cheapest. Surface speed 10–12 m/s.
FKM
Fluoroelastomer (FKM / FPM, Viton®)
Continuous range
-20 to 200 °C
Peak
220 °C
Max surface speed
38 m/s
Hot engines, gearboxes, fuels, aggressive media; more expensive. Surface speed 35–38 m/s.
VMQ
Silicone (VMQ / MVQ)
Continuous range
-60 to 180 °C
Peak
200 °C
Max surface speed
6 m/s (approx.)
Widest temperature range; absorbs lubricant (lower lip wear); poor abrasion/tear resistance; NOT for fuels or mineral oils. Low dynamic speed (~4–6 m/s, conservative — verify vs SKF CR / Freudenberg).
ACM
Polyacrylate (ACM)
Continuous range
-25 to 150 °C
Peak
—
Max surface speed
8 m/s (approx.)
Hot engine oil, EP gear oils (sulphur); poor water / low-temperature performance. Speed ~6–10 m/s (conservative — verify vs SKF CR / Freudenberg).
PTFE
PTFE (Teflon®)
Continuous range
-80 to 200 °C
Peak
—
Max surface speed
40 m/s
Lowest friction; dry-running capable; needs a harder/smoother shaft + higher fitting force; carbon/graphite-filled variants. Standard lip 40–45 m/s; purpose-built high-speed PTFE designs reach much higher (design-dependent, not a single catalogue figure).
HNBR
Hydrogenated nitrile (HNBR)
Continuous range
-40 to 150 °C
Peak
175 °C
Max surface speed
12 m/s (approx.)
Better heat/ozone resistance than NBR; H2S; turbo/compressor. Speed roughly NBR or slightly more (verify).

Values marked “approx.” are conservative and pending primary-source confirmation.

A secondary dust lip runs unlubricated and is limited to about 8 m/s regardless of material — above that, prefer a single-lip seal with a separate V-ring.

Operating limits

The shaft and housing requirements a correctly applied standard radial shaft seal assumes. Exceeding them is the root cause of most premature failures.

Parameter	Value
Pressure (standard types)	up to 0.5 bar (0.05 MPa); reduce speed above 0.02 MPa, anti-extrusion ring above 0.05 MPa
Shaft hardness	min 45 HRC; 55 HRC above 4 m/s or with abrasives; 65 HRC for a PTFE lip
Shaft surface finish (Ra)	rubber lip 0.2–0.8 µm, PTFE lip 0.1–0.4 µm; plunge-grind only (no spiral lead)
Housing surface finish (Ra)	metal OD ≤ 3.2 µm, rubber OD ≤ 6.3 µm
Shaft-to-bore runout (TIR)	max 0.05 mm
Shaft lead-in chamfer	15–30°, depth 1.5–2.5 mm, burr-free
Fit tolerances (ISO 6194-1)	shaft h11, housing H8; metal OD interference 0.2–0.5 mm

Common dimensions

A representative set of common standard sizes in the d1 (shaft) × d2 (bore) × b (width) form, in millimetres. Gufera sizing is preferred-size based, so this is a common-stock grid, not an exhaustive list.

156 common sizes

Shaft d1 (mm)	Bore d2 (mm)	Width b (mm)	Designation
6	16	7	6x16x7
7	16	7	7x16x7
7	19	7	7x19x7
8	16	7	8x16x7
8	19	7	8x19x7
8	22	7	8x22x7
9	22	7	9x22x7
10	19	7	10x19x7
10	22	7	10x22x7
10	24	7	10x24x7
10	26	7	10x26x7
11	22	7	11x22x7
12	22	7	12x22x7
12	24	7	12x24x7
12	25	7	12x25x7
12	28	7	12x28x7
12	30	7	12x30x7
13	24	7	13x24x7
14	24	7	14x24x7
14	28	7	14x28x7
14	30	7	14x30x7
15	24	7	15x24x7
15	26	7	15x26x7
15	28	7	15x28x7
15	30	7	15x30x7
15	35	7	15x35x7
16	28	7	16x28x7
16	30	7	16x30x7
17	28	7	17x28x7
17	30	7	17x30x7
17	35	7	17x35x7
18	30	7	18x30x7
18	32	7	18x32x7
18	35	7	18x35x7
19	32	7	19x32x7
20	30	7	20x30x7
20	32	7	20x32x7
20	35	7	20x35x7
20	40	7	20x40x7
20	47	7	20x47x7
22	35	7	22x35x7
22	40	7	22x40x7
22	47	7	22x47x7
24	37	7	24x37x7
24	40	7	24x40x7
25	35	7	25x35x7
25	40	7	25x40x7
25	42	7	25x42x7
25	47	7	25x47x7
25	47	8	25x47x8
25	52	7	25x52x7
26	42	7	26x42x7
28	40	7	28x40x7
28	47	7	28x47x7
28	52	7	28x52x7
30	42	7	30x42x7
30	45	7	30x45x7
30	47	7	30x47x7
30	50	8	30x50x8
30	52	7	30x52x7
30	62	8	30x62x8
32	45	8	32x45x8
32	47	7	32x47x7
32	52	8	32x52x8
33	50	8	33x50x8
35	47	7	35x47x7
35	50	8	35x50x8
35	52	7	35x52x7
35	55	8	35x55x8
35	62	8	35x62x8
35	72	10	35x72x10
36	50	8	36x50x8
36	52	7	36x52x7
36	56	8	36x56x8
38	52	7	38x52x7
38	55	8	38x55x8
38	62	8	38x62x8
40	52	7	40x52x7
40	55	8	40x55x8
40	62	8	40x62x8
40	62	10	40x62x10
40	72	10	40x72x10
42	55	8	42x55x8
42	62	8	42x62x8
42	72	10	42x72x10
45	60	8	45x60x8
45	62	8	45x62x8
45	65	10	45x65x10
45	72	8	45x72x8
45	72	10	45x72x10
45	85	10	45x85x10
48	62	8	48x62x8
48	72	10	48x72x10
50	65	8	50x65x8
50	68	8	50x68x8
50	70	10	50x70x10
50	72	8	50x72x8
50	72	12	50x72x12
50	80	10	50x80x10
50	90	10	50x90x10
52	72	10	52x72x10
52	75	10	52x75x10
55	72	10	55x72x10
55	80	10	55x80x10
55	85	10	55x85x10
56	72	10	56x72x10
56	80	10	56x80x10
58	80	10	58x80x10
60	80	10	60x80x10
60	85	10	60x85x10
60	90	10	60x90x10
62	85	10	62x85x10
62	90	10	62x90x10
63	85	10	63x85x10
63	90	10	63x90x10
65	85	10	65x85x10
65	90	10	65x90x10
65	100	10	65x100x10
68	90	10	68x90x10
70	90	10	70x90x10
70	95	10	70x95x10
70	100	10	70x100x10
72	95	10	72x95x10
72	100	10	72x100x10
75	95	10	75x95x10
75	100	10	75x100x10
75	110	10	75x110x10
78	100	10	78x100x10
80	100	10	80x100x10
80	110	10	80x110x10
80	120	12	80x120x12
85	110	12	85x110x12
85	120	12	85x120x12
90	110	12	90x110x12
90	120	12	90x120x12
95	120	12	95x120x12
95	125	12	95x125x12
100	125	12	100x125x12
100	130	12	100x130x12
105	130	12	105x130x12
110	130	12	110x130x12
110	140	12	110x140x12
115	140	12	115x140x12
120	150	12	120x150x12
125	150	12	125x150x12
125	160	15	125x160x15
130	160	12	130x160x12
140	170	15	140x170x15
150	180	15	150x180x15
150	190	15	150x190x15
160	190	15	160x190x15
160	200	15	160x200x15
170	200	15	170x200x15
180	210	15	180x210x15
190	220	16	190x220x16
200	230	15	200x230x15

About this reference

The taxonomy and limits are based on DIN 3760, DIN 3761 and ISO 6194-1, cross-checked against major seal catalogues. This is a knowledge reference, not a product catalogue — for the right part for your application, use the configurator or contact us.

Disclaimer

The values are indicative reference figures for correctly applied standard seals. Special and high-pressure types differ; for critical applications confirm the exact limits with the seal manufacturer.