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M7N

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Item	Part no. toDIN 24250	Description
1.1	472	Seal face
1.2	485	Drive collar
1.3	474	Thrust ring
1.4	412.1	O-Ring
1.5	477	Spring
1.6	904	Set screw
2	475	Seat (G9)
3	412.2	O-Ring

1) d1 > 100 mm: 30°
2) d1 > 100 mm: +0.1
3) d1 > 100 mm: H7

M7N

PDF data sheet

Features

For plain shafts
Single seal
Unbalanced
Super-Sinus-spring
Independent of direction of rotation

Advantages

Universal application opportunities
Efficient stock keeping due to easily interchangeable faces
Extended selection of materials
Insensitive to low solids contents
Flexibility in torque transmissions
Self cleaning effect
Short installation length possible (G16)
Pumping screw for media with higher viscosity (M7..F)

Operating range

Shaft diameter:
d1 = 14 ... 100 mm (0.55 " … 3.94 ")
Pressure:
p1 = 25 bar (363 PSI)
Temperature:
t = -50 °C ... +220 °C
(-58 °F ... +428 °F)
Sliding velocity:
vg = 20 m/s (66 ft/s)

Axial movement:
d1 = up to 25 mm: ±1.0 mm
d1 = 28 up to 63 mm: ±1.5 mm
d1 = from 65 mm: ±2.0 mm

Materials

Seal face: Silicon carbide (Q1)
Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)
Seat G4, G6 (Q1), Seat G13 (A, B)

Secondary seals: EPDM (E), FKM (V), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G), Duplex (G1)

Standards and approvals

EN 12756
WRAS
UBA(KTW)

Recommended applications

Lube oils
Low solids content media
Process industry
Chemical industry
Pulp and paper industry
Water and waste water technology
Shipbuilding
Water / sewage water pumps
Chemical standard pumps
Vertical screw pumps
Gear wheel feed pumps
Multistage pumps (drive side)
Circulation of printing colors with viscosity 500 ... 15,000 mm2/s.

Product variants

M74F
Shaft diameter:
d1 = 14 ... 200 mm (0.55" ... 7.87")
Dimensions, items and descriptions as for type M7N, but with multiple springs and pumping screw, dependent on direction of rotation.
(Viscosity ≤ ISO VG10).

M74S2
Shaft diameter:
d1 = 28 … 200 mm (1.10" ... 7,87")
Dimensions, items and descriptions as for type M7N, but with multiple springs and drive key.
(without item no. 1.6)

M78N
Shaft diameter:
d1 = 18 … 100 mm (0.71" … 3.94")
Temperature: t = max. 180 °C (356 °F)

Dimensions, items and description as for M7N. Design of the seal face especially for secondary sealing element made of PTFE (T).
Seal face: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)*
Seat G9: Special cast CrMo steel (S)*, Silicon carbide (Q1)

* Cannot be combined with seal face made of silicon carbide (Q1)

https://media-assets.eagleburgmann.com/image/108134910297/image_t4eea2fbt10v59ua0dbobe6q0p/-FWEBP

M74
Dimensions, items and descriptions as for M7N, but with multiple springs (Item no. 1.5).
Preferably for d1 >100 mm (3.94").

https://media-assets.eagleburgmann.com/image/108134910297/image_34mcbpmild1d18l982l8njtl3j/-FWEBP

M7F
Shaft diameter d1 = max. 100 mm (3.94")
Dimensions, items and descriptions as for type M7N, but with pumping screw, dependent on direction of rotation.
(Viscosity ≤ ISO VG10).

https://media-assets.eagleburgmann.com/image/108134910297/image_44h7p0c6dl15l70b3bpjo6o06n/-FWEBP

M7S2
Shaft diameter: d1 = max. 100 mm (3.94").
Dimensions, items and descriptions as for type M7N, but with drive key.
(without item no. 1.6)

Similar products

AX25

External configuration
Balanced
Independent of direction of rotation
Independent of pressure direction

AX40K

Stationary springs
Balanced
Independent of direction of rotation
Independent of pressure direction

BT-C5E

Single seal
For plain shafts
Unbalanced
Multiple springs, rotating
Independent of direction of rotation

Back to overview

d₁	d₃	d₆	d₇	d₈	d₁₁	d₁₂	d₂₄	d_s	l_1k	l₃	l₅	l₆	l₇	l₈	l₉	l₁₀	l₁₁	l₁₂	l₁₃	l₁₄	l₁₅	l₁₆	l₂₈	b	f	m_x	u_max.	t	R
14*	25.5	21.0	25.0	3	20.5	24.6	16	34	35.0	25.0	1.5	4	8.5	17.5	10.0	7.5	10.0	6.5	7.6	5.6	1.2	3.8	6.6	4	6	M5	10	1.5	1.2
16*	27.5	23.0	27.0	3	22.0	28.0	18	36	35.0	25.0	1.5	4	8.5	17.5	10.0	7.5	11.5	8.5	9.0	7.5	1.2	3.8	6.6	4	6	M5	10	1.5	1.5
18*	33	27.0	33.0	3	24.0	30.0	20	38	37.5	26.0	2.0	5	9.0	19.5	11.5	8.5	12.5	9.0	10.0	8.0	1.5	5.0	7.5	5	7	M5	12	1.1	1.5
20*	35	29.0	35.0	3	29.5	35.0	22	40	37.5	26.0	2.0	5	9.0	19.5	11.5	8.5	12.5	8.5	9.5	7.5	1.5	5.0	7.5	5	7	M5	12	1.1	1.5
22*	37	31.0	37.0	3	29.5	35.0	24	42	37.5	26.0	2.0	5	9.0	19.5	11.5	8.5	12.5	8.5	9.5	7.5	1.5	5.0	7.5	6	7	M5	12	1.5	1.5
24*	39	33.0	39.0	3	32.0	38.0	26	44	40.0	28.5	2.0	5	9.0	19.5	11.5	8.5	12.5	8.5	9.5	7.5	1.5	5.0	7.5	6	8	M5	12	1.5	1.5
25*	40	34.0	40.0	3	32.0	38.0	27	45	40.0	28.5	2.0	5	9.0	19.5	11.5	8.5	12.5	8.5	9.5	7.5	1.5	5.0	7.5	6	8	M5	12	1.5	1.5
28*	43	37.0	43.0	3	36.0	42.0	30	47	42.5	31.0	2.0	5	9.0	19.5	11.5	8.5	14.0	10.0	11.0	9.0	1.5	5.0	7.5	6	8	M6	13	1.5	1.5
30*	45	39.0	45.0	3	39.2	45.0	32	49	42.5	31.0	2.0	5	9.0	19.5	11.5	8.5	14.0	11.5	11.0	10.5	1.5	5.0	7.5	6	8	M6	13	1.5	1.5
32*	47	42.0	48.0	3	42.2	48.0	34	51	42.5	31.0	2.0	5	9.0	19.5	11.5	8.5	14.0	11.5	11.0	10.5	1.5	5.0	7.5	6	8	M6	13	1.5	1.5
33*	48	42.0	48.0	3	44.2	50.0	35	51	42.5	31.0	2.0	5	9.0	19.5	11.5	8.5	14.5	12.0	11.5	10.5	1.5	5.0	7.5	6	8	M6	13	1.5	1.5
35*	50	44.0	50.0	3	46.2	52.0	37	54	42.5	31.0	2.0	5	9.0	19.5	11.5	8.5	14.5	12.0	11.5	11.0	1.5	5.0	7.5	6	8	M6	13	1.5	1.5
38*	55	49.0	56.0	4	49.2	55.0	40	59	45.0	31.0	2.0	6	9.0	22.0	14.0	10.0	14.5	11.3	11.5	10.3	1.5	5.0	9.0	6	8	M6	13	1.5	1.5
40*	57	51.0	58.0	4	52.2	58.0	42	61	45.0	31.0	2.0	6	9.0	22.0	14.0	10.0	14.5	11.8	11.5	10.8	1.5	5.0	9.0	6	8	M6	13	1.5	1.5
43*	60	54.0	61.0	4	53.3	62.0	45	65	45.0	31.0	2.0	6	9.0	22.0	14.0	10.0	17.0	13.2	14.3	12.0	2.0	6.0	9.0	6	8	M6	13	1.5	2.5
45*	62	56.0	63.0	4	55.3	64.0	47	66	45.0	31.0	2.0	6	9.0	22.0	14.0	10.0	17.0	12.8	14.3	11.6	2.0	6.0	9.0	6	8	M6	13	1.5	2.5
48*	65	59.0	66.0	4	59.7	68.4	50	69	45.0	31.0	2.0	6	9.0	22.0	14.0	10.0	17.0	12.8	14.3	11.6	2.0	6.0	9.0	6	8	M6	13	1.5	2.5
50*	67	62.0	70.0	4	60.8	69.3	52	71	47.5	32.5	2.5	6	9.0	23.0	15.0	10.5	17.0	12.8	14.3	11.6	2.0	6.0	9.5	6	8	M6	13	1.5	2.5
53*	70	65.0	73.0	4	63.8	72.3	55	75	47.5	32.5	2.5	6	9.0	23.0	15.0	12.0	17.0	13.5	14.3	12.3	2.0	6.0	11.0	6	8	M6	13	1.5	2.5
55*	72	67.0	75.0	4	66.5	75.4	57	76	47.5	32.5	2.5	6	9.0	23.0	15.0	12.0	18.0	14.5	15.3	13.3	2.0	6.0	11.0	6	8	M6	13	1.5	2.5
58*	79	70.0	78.0	4	69.5	78.4	60	83	52.5	37.5	2.5	6	9.0	23.0	15.0	12.0	18.0	14.5	15.3	13.3	2.0	6.0	11.0	8	9	M8	13	1.9	2.5
60*	81	72.0	80.0	4	71.5	80.4	62	85	52.5	37.5	2.5	6	9.0	23.0	15.0	12.0	18.0	14.5	15.3	13.3	2.0	6.0	11.0	8	9	M8	13	1.9	2.5
63*	84	75.0	83.0	4	74.5	83.4	65	88	52.5	37.5	2.5	6	9.0	23.0	15.0	12.0	18.0	14.2	15.3	13.3	2.0	6.0	11.0	8	9	M8	13	1.9	2.5
65*	86	77.0	85.0	4	76.5	85.4	67	95	52.5	37.5	2.5	6	9.0	23.0	15.0	12.0	18.0	14.2	15.3	13.0	2.0	6.0	11.0	8	9	M8	13	1.9	2.5
68*	89	81.0	90.0	4	82.7	91.5	70	93	52.5	34.5	2.5	7	9.0	26.0	18.0	12.5	19.0	14.9	16.0	13.7	2.0	6.0	11.3	8	9	M8	13	1.9	2.5
70*	91	83.0	92.0	4	83.0	92.0	72	95	60.0	42.0	2.5	7	9.0	26.0	18.0	12.5	18.0	14.2	15.3	13.0	2.0	6.0	11.3	8	9	M8	16	1.9	2.5
75*	99	88.0	97.0	4	90.2	99.0	77	105	60.0	42.0	2.5	7	9.0	26.0	18.0	12.5	18.0	15.2	15.3	14.0	2.0	6.0	11.3	8	10	M8	16	1.9	2.5
80*	104	95.0	105.0	4	95.2	104.0	82	109	60.0	41.8	3.0	7	9.0	26.2	18.2	13.0	19.0	16.2	16.3	15.0	2.0	6.0	12.0	8	10	M8	16	1.9	2.5
85*	109	100.0	110.0	4	100.2	109.0	87	114	60.0	41.8	3.0	7	9.0	26.2	18.2	15.0	19.0	16.0	16.3	14.8	2.0	6.0	14.0	8	10	M8	16	1.9	2.5
90*	114	105.0	115.0	4	105.2	114.0	92	119	65.0	46.8	3.0	7	9.0	26.2	18.2	15.0	19.0	16.0	16.3	14.8	2.0	6.0	14.0	10	10	M8	20	2.3	2.5
95*	119	110.0	120.0	4	111.6	120.3	97	124	65.0	47.8	3.0	7	9.0	25.2	17.2	15.0	20.0	17.0	17.3	15.8	2.0	6.0	14.0	10	10	M8	20	2.3	2.5
100*	124	115.0	125.0	4	114.5	123.3	102	129	65.0	47.8	3.0	7	9.0	25.2	17.2	15.0	20.0	17.0	17.3	15.8	2.0	6.0	14.0	10	10	M8	20	2.3	2.5
105	138	122.2	134.3	5	–	–	108	143	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
110	143	128.2	140.3	5	–	–	113	148	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
115	148	136.2	148.3	5	–	–	118	153	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
120	153	138.2	150.3	5	–	–	123	158	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
125	158	142.2	154.3	5	–	–	128	163	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
130	163	146.2	158.3	5	–	–	133	168	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
135	168	152.2	164.3	5	–	–	138	173	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
140	173	156.2	168.3	5	–	–	143	178	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
145	178	161.2	173.3	5	–	–	148	183	67.0	47.0	2.0	10	12.0	30.0	20.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
150	183	168.2	180.3	5	–	–	153	188	69.0	47.0	2.0	10	12.0	32.0	22.0	–	–	–	–	–	–	–	–	10	10	M8	20	2.3	-
155	191	173.2	185.3	5	–	–	158	196	80.0	56.0	2.0	12	12.0	34.0	24.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
160	196	178.2	190.3	5	–	–	163	201	80.0	56.0	2.0	12	12.0	34.0	24.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
165	201	183.2	195.3	5	–	–	168	206	80.0	56.0	2.0	12	12.0	34.0	24.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
170	206	188.2	200.3	5	–	–	173	211	80.0	56.0	2.0	12	12.0	34.0	24.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
175	211	193.2	205.3	5	–	–	178	216	80.0	56.0	2.0	12	12.0	34.0	24.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
180	216	207.5	219.3	5	–	–	183	221	84.0	56.0	2.0	12	12.0	38.0	28.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
185	221	212.5	224.3	5	–	–	188	226	84.0	56.0	2.0	12	12.0	38.0	28.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
190	226	217.5	229.3	5	–	–	193	231	84.0	56.0	2.0	12	12.0	38.0	28.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
195	231	222.5	234.3	5	–	–	198	236	84.0	56.0	2.0	12	12.0	38.0	28.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-
200	236	227.5	239.3	5	–	–	203	241	84.0	56.0	2.0	12	12.0	38.0	28.0	–	–	–	–	–	–	–	–	12	12	M8	24	2.1	-

Dimensions in millimeter d~1~ 200 on request * EN 12756