ISO 5211 Mounted Flange Dimensions

ISO 5211 Mounted Flange Dimensions detail the standardized sizes and specifications for mounting flanges used in valve and actuator assemblies. This standard ensures compatibility and interchangeability, facilitating efficient and accurate connections between different manufacturers’ components. Ideal for ensuring uniformity and precision in industrial valve applications.

ISO 5211 & MSS SP-101 Standard Mounted Flange Dimensions

Standard	Flange Code	d1 min Flange Diameter [mm]	d2 [mm]	d3 Pitch Circle [mm]	d4 Bolt Thread	h1 max. [mm]	h2 min. [mm]	h3 min. [mm]	Number of Screws Studs,or Bolts n	Maximum Allowed Torque [Nm]
ISO 5211	F03	Φ46	Φ25	Φ36	M5	3	8	5	4	32
ISO 5211	F04	Φ54	Φ30	Φ42	M5	3	8	5	4	63
ISO 5211	F05	Φ65	Φ35	Φ50	M6	3	9	6	4	125
MSS SP-101	FA05	Φ65	Φ35	Φ50.8	1/4-20 UNC	3	9	6	4	129
ISO 5211	F07	Φ90	Φ55	Φ70	M8	3	12	8	4	250
MSS SP-101	FA07	Φ89.9	Φ55	Φ69.9	5/16-18 UNC	3	12	8	4	292
MSS SP-101	FA08	Φ89.9	Φ55	Φ80	5/16-18 UNC	3	12	8	4	332
–	F08*	Φ89.9	Φ55	Φ80	M8	3	12	8	4	332
ISO 5211	F10	Φ125	Φ70	Φ102	M10	3	15	10	4	500
MSS SP-101	FA10	Φ125	Φ70	Φ101.6	3/8-16 UNC	3	15	10	4	630
MSS SP-101	FA11	Φ127	Φ70	Φ107.7	3/8-16	3	15	10	4	664
ISO 5211	F12	Φ150	Φ85	Φ125	M12	3	18	12	4	1,000
MSS SP-101	FA12	Φ150.1	Φ85	Φ125.7	1/2-13 UNC	3	18	12	4	1,424
ISO 5211	F14	Φ175	Φ100	Φ140	M16	4	24	16	4	2,000
MSS SP-101	FA14	Φ175	Φ100	Φ139.7	5/8-11 UNC	4	24	16	4	2,508
ISO 5211	F16	Φ210	Φ130	Ø165	M20	5	30	20	4	4,000
MSS SP-101	FA16	Φ209.6	Φ130	Φ165.1	3/4-10 UNC	5	30	20	4	4,406
MSS SP-101	FA19	Φ222.3	Φ155	Φ190.5	5/8-11 UNC	5	27	18	8	6,881
–	F19*	Φ222	Φ155	Φ190	M16	5	27	18	8	6,881
–	F20**	Φ255	Φ160	Φ205	M16	5	24	16	8	7,100
–	FA20**	Φ255	Φ160	Φ205	5/8-11 UNC	5	24	16	8	7,100
ISO 5211	F25	Φ300	Φ200	Φ254	M16	5	24	16	8	8,000
MSS SP-101	FA25	Φ289.1	Φ200	Φ254	5/8-11 UNC	5	24	16	8	9,186
ISO 5211	F30	Φ350	Φ230	Φ298	M20	5	30	20	8	16,000
MSS SP-101	FA30	Φ342.9	Φ230	Φ298.5	314-10 UNC	5	30	20	8	15,965
ISO 5211	F35	Φ415	Φ260	Φ356	M30	5	45	30	8	32,000
MSS SP-101	FA35	Φ406.4	Φ260	Φ355.6	1-8 UNC	5	45	30	8	34,438
MSS SP-101	FA36	Φ406.4	Φ260	Φ355.6	1 Y4-7	5	48	32	8	55,182
–	F36*	Φ406.4	Φ260	Φ355.6	M32	5	48	32	8	55,182
ISO 5211	F40	Φ475	Φ300	Φ406	M36	8	54	36	8	63,000
MSS SP-101	FA40	Φ475	Φ300	Φ406.4	114-7 UNC	8	54	36	8	63,046
ISO 5211	F48	Φ560	Φ370	Φ483	M36	8	54	36	12	125,000
MSS SP-101	FA48	Φ558.8	Φ370	Φ482.6	114-7 UNC	8	54	36	12	112,262
ISO 5211	F60	Φ686	Φ470	Φ603	M36	8	54	36	20	250,000
MSS SP-101	FA60	Φ673.1	Φ470	Φ603.3	1 V4-7 UNC	8	54	36	20	233,879
ISO 5211	F80	Φ900	Φ670	Φ813	M42	10	63	42	20	500,000
ISO 5211	F100	Φ1200	Φ870	Φ1042	M42	10	63	42	32	1,000,000

* Not part of ISO 5211:2017. F08, F19, and F36 are sometimes used by manufacturers to fill the gap between other ISO sizes and to allow mounting MSS SP-101 through bolted gearboxes and actuators onto valves (or vice versa) used in metric markets. They are mirror versions of MSS SP-101 FA08, FA19, and FA36 with metricated bolt holes. F19 is being considered by the ISO committee for addition in the next revision of ISO 5211.
* Not part of ISO 5211 or MSS SP-101:2014. F20/FA20 is sometimes used by manufacturers to fill the gap between F19/FA19 and F25/FA25.
* Bolt Hole d5 as per ISO 273 Medium or ASME B18.2.8 Normal.

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ISO 5211 F40 – F100 Flange Interface | Separation Comparison (Threaded Hole)

MSS SP-101 FA05 – FA60 Flange Interface | Separation Comparison (Threaded Hole)

ISO 5211 Flange Drive by Key

Flange Standard	h4 max. [mm]	L5 min [mm	d7 [mm] Max.Transmissible Torque [Nm
F05	3.0	30	Φ12	Φ14	Φ18	Φ22
F05	3.0	30	32	63	125	250
F07	3.0	35	Φ14	Φ18	Φ22	Φ28
F07	3.0	35	63	125	250	500
F10	3.0	45	Ø18	Φ22	Φ28	Φ36	Φ42
F10	3.0	45	125	250	500	1000	1500
F12	3.0	55	Φ22	Φ28	Φ36	Φ42	Φ48	Φ50
F12	3.0	55	250	500	1000	1500	2000	3000
F14	5.0	65	Ø28	Φ36	Φ42	Φ48	Φ50	Φ60
F14	5.0	65	500	1000	1500	2000	3000	4000
F16	5.0	80	Φ42	Φ48	Φ50	Φ60	Φ72	Φ80
F16	5.0	80	1500	2000	3000	4000	8000	12000
F25	5.0	110	Ø48	Φ50	Φ60	Φ72	Φ80	Φ98
F25	5.0	110	2000	3000	4000	8000	12000	16000
F30	5.0	130	Φ60	Φ72	Φ80	Φ98	Φ100	Φ120
F30	5.0	130	4000	8000	12000	16000
F35	5.0	180	Φ160	Maximum transmissible torque by calculation
F40	8.0	200	Φ180
F48	8.0	250	Φ220
F60	08	310	Φ280
F80	10	455	Φ350
F100	10	655	Φ440

ISO 5211 Flange Driven by Parallel or Diagonal Square Heads

Flange Code	h4 max. [mm]	L5 min [mm	d7 [mm] Max.Transmissible Torque [Nm
F05	3.0	30	Φ12	Φ14	Φ18	Φ22
F05	3.0	30	32	63	125	250
F07	3.0	35	Φ14	Φ18	Φ22	Φ28
F07	3.0	35	63	125	250	500
F10	3.0	45	Ø18	Φ22	Φ28	Φ36	Φ42
F10	3.0	45	125	250	500	1000	1500
F12	3.0	55	Φ22	Φ28	Φ36	Φ42	Φ48	Φ50
F12	3.0	55	250	500	1000	1500	2000	3000
F14	5.0	65	Ø28	Φ36	Φ42	Φ48	Φ50	Φ60
F14	5.0	65	500	1000	1500	2000	3000	4000
F16	5.0	80	Φ42	Φ48	Φ50	Φ60	Φ72	Φ80
F16	5.0	80	1500	2000	3000	4000	8000	12000
F25	5.0	110	Ø48	Φ50	Φ60	Φ72	Φ80	Φ98
F25	5.0	110	2000	3000	4000	8000	12000	16000
F30	5.0	130	Φ60	Φ72	Φ80	Φ98	Φ100	Φ120
F30	5.0	130	4000	8000	12000	16000
F35	5.0	180	Φ160	Maximum transmissible torque by calculation
F40	8.0	200	Φ180
F48	8.0	250	Φ220
F60	08	310	Φ280
F80	10	455	Φ350
F100	10	655	Φ440

ISO 5211 Flange Driven by Parallel or Diagonal Square Heads

Flange Code	h4 max [mm]	s [mm]
F03	1.5	9
F04	1.5	9	11
F05	3.0	9	11	14
F07	3.0		11	14	17
F10	3.0			14	17	19	22
F12	3.0				17	19	22	27
F14	5.0						22	27	36
F16	5.0							27	36	46
F25	5.0								36	46	55	一
F30	5.0									46	55	75
d8 min.		Φ12.1	Φ14.1	Φ18.1	Φ22.2	Φ25.2	Φ28.2	Φ36.2	Φ48.2	Φ60.2	Φ72.2	Φ98.2
d9 max.		Φ9.5	Φ11.6	Φ14.7	Φ17.9	Φ20	Φ23.1	Φ28.4	Φ38	Φ48.5	Φ57.9	Φ79.1
L5 min.		10	12	16	19	21	24	29	38	48	57	77
Max. Transmissible Torque [Nm]		32	63	125	250	350	500	1.000	2000	4000	8000	16000

ISO 5211 Flange Driven by Parallel or Diagonal Square Heads

Flange Code	h4 max [mm]	s [mm]
F03	1.5	9(8)
F04	1.5	9	11 (9.5)
F05	3.0	9	11	14 (12)
F07	3.0		11	14	17(15)
F10	3.0			14	17	19(19)	22
F12	3.0				17	19	22	27 (24)
F14	5.0						22	27	36 (32)
F16	5.0							27	36	46 (40)
F25	5.0								36	46	55(48)
F30	5.0									46	55	75(66)
d8 min		Φ12.1	Φ14.1	Φ18.1	22.2	25.2	28.2	36.2	48.2	60.2	72.2	98.2
d9 max.		Φ10	Φ12.2	Φ15.5	Φ18.7	Φ20.9	Φ24.2	Φ29.6	Φ39.3	Φ50.2	Φ59.9	Φ81.6
L5 min		10 (12)	12(15)	16(18)	Φ19 (22)	Φ21	Φ24(28)	Φ29 (36)	Φ38 (40)	Φ48 (44)	Φ57 (52)	Φ77 (70)
Max.Transmissible Torque for Flat Head [Nm]		32	63	125	250	350	500	1000	2000	4000	8000	16000
Max.Transmissible Torque for Bi-square [Nm]		20	40	80	175	225	350	700	1400	2800	5600	11200

ISO 5211 Flange Driven by Involute Spline

Flange Code	h4 max. [mm]	d11 [mm	d10 min [mm]	Modul m ISO 4156-1	L5 min.[mm]	Max Transmissible Torque [Nm]
F03	1.5	Φ16.1	Φ14.5	1.5	12	32
F04	1.5	Φ19.1	Φ17	2.0	15	63
F05	3.0	Φ24.1	Φ21.5	2.5	18	125
F07	3.0	Φ28.1	Φ25	3.0	22	250
F10	3.0	Φ36.1	Φ32	4.0	28	500
F12	3.0	Φ47.1	Φ42	5.0	36	1000
F14	5.0	Φ60.1	Φ54	6.0	40	2000
F16	5.0	Φ74.1	Φ67	7.0	44	4000
F25	5.0	Φ88.1	Φ80	8.0	52	8000
F30	5.0	Φ116.1	Φ106	10	70	16000

ISO 5211 – Position of Actuator Parts at Interface
Closing Direction is Clockwise & Valve Shown in Closed Position

a. Actuated Drive by Key, 90° Key and 180° Key

b. Actuated Drive by Parallel or Diagonal Square Heads

c. Actuated Drive by Flat Head

MSS SP-101 EXTRACT - Drive Type

a. Keyed Output Assembly

Flange Type/Code	D7 max in.[mm]	L1 min. [mm]	Key Section Width x Thickness in.
FA05	0.87 (22.1)	1.30 (33.0)	3/16 x 3/16
FA07	1.10 (27.9)	1.50 (38.1)	1/4 x 1/4
FA08	1.10 (27.9)	1.50 (38.1)	1/4 x 1/4
FA10	1.65 (41.9)	1.77 (45.0)	3/8 x 3/8
FA11	1.65 (41.9)	1.77 (45.0)	3/8 x 3/8
FA12	1.97 (50.0)	2.17 (55.1)	1/2 x 1/2
FA14	2.36 (59.9)	2.90 (73.7)	5/8 x 5/8
FA16	3.15 (80.0)	3.15 (80.0)	3/4 x 3/4
FA19	3.50 (88.9)	3.00 (76.2)	7/8 x 7/8
FA25	3.94 (100.1)	4.33 (110.0)	1 x 1
FA30	4.72 (119.9)	5.12 (130.0)	1-1/4 x 1- 1/2
FA35	6.30 (160.0)	7.09 (180.1)	1-1/2 x 1-1/2
FA36	6.30 (160.0)	7.09 (180.1)	1-1/2 x 1-1/2
FA40	7.09 (180.1)	8.30 (210.8)	1-3/4 x 1-1/2
FA48	8.66 (220.0)	11.00 (279.4)	2 x 1-1/2
FA60	12.00 (305)	11.00 (279.4)	3 x2

b. Flated Output Shaft Assembly

Flange Type/Code	D8 in.[mm]	B2 in.[mm]	L4 in.[mm]	L5 in.[mm]
FA05	0.75 (19.1)	0.50 (12.7)	0.75 (19.1	0.50 (12.7)
FA08	0.88 (22.4)	0.62 (15.7)	1.03 (26.2)	0.75 (19.1)
FA11	1.12 (28.5)	0.88 (22.4)	1.03 (26.2)	0.88 (22.4)
FA12	1.50 (38.1)	1.12 (28.5)	1.75 (38.1)	1.50 (28.5)
FA14	2.00 (50.8)	1.50 (38.1)	1.75 (44.4)	1.50 (38.1)
FA16	2.62 (66.5)	1.75 (44.4)	2.00 (50.8)	1.75 (44.4)

c. Square Output Shaft Assembly

Flange Type/size	D8 in.[mm]	B3 in.[mm]	L4 in.[mm]	L5 in.[mm]
FA05	0.75 (19.1)	0.56 (14.2)	0.75 (19.1	0.50 (12.7)
FA08	0.88 (22.4)	0.75 (19.1)	1.03 (26.2)	0.75 (19.1)
FA11	1.12 (28.5)	0.88 (22.4)	1.03 (26.2)	0.88 (22.4)
FA12	1.50 (38.1)	1.12 (28.5)	1.50 (38.1)	1.12 (28.5)
FA14	2.00 (50.8)	1.62 (41.1)	1.75 (44.4)	1.50 (38.1)
FA16	2.62 (66.5)	2.00 (50.8)	2.00 (50.8)	1.75 (44.4)

c. MSS SP-101 Shaft Orientations
Closing Direction is Clockwise & Valve Shown in Closed Position

Appendix A – Clearance Holes for Bolts and Screws

a. ISO 273* - Clearance Holes for Bolts and Screws

Thread Diameter d [mm]	Clearance Hole dn [inch]
Thread Diameter d [mm]	Fine	Medium	Coarse
5	5.3	5.5	5.8
6	6.4	6.6	7
8	8.4	9	10
10	10.5	11	12
12	13	13.5	14.5
16	17	17.5	18.5
20	21	22	24
30	31	33	35
36	37	39	42
42	43	45	48

b. ASME B18.2.8** - Clearance Holes for Bolts, Screws and Studs

Nominal Screw Size d [inch]	Clearance Hole dn [inch]
Nominal Screw Size d [inch]	Close	Normal	Loose
1/4	17/64	9/32	19/64
5/16	21/64	11/32	23/64
3/8	25/64	13/32	27/64
1/2	17/32	9/16	39/64
5/8	21/32	11/16	47/64
3/4	25/32	13/16	29/32
1-1/4	19/32	111/32	17/15

ISO 5211 Mounted Flange Dimensions

ISO 5211 & MSS SP-101 Standard Mounted Flange Dimensions

ISO 5211 F40 – F100 Flange Interface | Separation Comparison (Threaded Hole)