© Copyright MAIN Mfg. 2017
3181 TRI-PARK DR. GRAND BLANC, MI 48439 800-521-7918 810-953-1380 FAX 810-953-1385 INFO@MAINMFG.COM
PART NO. SCREW SIZE O-RING
1387-12-12
1388-12-12
1387-16-16
1388-16-16
1387-20-20
1388-20-20
1387-24-24
1388-24-24
1387-32-32
1388-32-32
1387-40-40 .94 MK 531 7/8-9 x 2 3/4 236
1388-40-40 7/8-9 --------- --------- ---
1387-48-48 .94 MK 531 7/8-9 x 2 3/4 236
1388-48-48 7/8-9 --------- --------- ---
1387-56-56 .94 MK 589 7/8-9 x 3 240
1388-56-56 7/8-9 --------- --------- ---
FLANGE
SIZE
PIPE
SIZE
PART
NUMBER
3
2
1½
1
3½
5.50 2.75 1.50
.75 4.045
3.540
6.00 3.00 1.75 2.125 4.250 3.38
1.875 3.750 2.88 .75
2.44 .755.50 2.75 1.50 1.875 3.750 2.911
MOUNTING KIT
WT
SOCKET WELD PIPE IN-LINE FLANGES
Order Separately
A B C D E F
G
H
J
K
¾
2
¾
1
1¼
2½
3½
3
2½
1½
1¼
PART NO. SCREW SIZE O-RING
1389-08-08 .41 MK 2501 3/8-16 x 1 3/4 210
1390-08-08 3/8-16 --------- --------- ---
1389-12-12 .41 MK 2502 3/8-16 x 1 3/4 214
1390-12-12 3/8-16 --------- --------- ---
1389-16-16 .53 MK 2503 1/2-13 x 2 219
1390-16-16 1/2-13 --------- --------- ---
1389-20-20 .66 MK 2504 5/8-11 x 2 1/2 222
1390-20-20 5/8-11 --------- --------- ---
1389-24-24 .66 MK 2505 5/8-11 x 2 3/4 225
1390-24-24 5/8-11 --------- --------- ---
1389-32-32 .78 MK 2506 3/4-10 x 3 1/2 228
1390-32-32 3/4-10 --------- --------- ---
1389-40-40 .94 MK 2507 7/8-9 x 3 1/2 232
1390-40-40 7/8-9 --------- --------- ---
1389-48-48 1.06 MK 2508 1-8 x 4 236
1390-48-48 1-8 --------- --------- ---
1389-56-56 1.31 MK 2509 1 1/4-7 x 5 342
1390-56-56 1 1/4-7 --------- --------- ---
1389-64-64 1.31 MK 2510 1 1/4-7 x 5 346
1390-64-64 1 1/4-7 --------- --------- ---
1389-80-80 1.56 MK 2511 1 1/2-6 x 6 353
1390-80-80 1 1/2-6 --------- --------- ---
FLANGE
SIZE
PIPE
SIZE
PART
NUMBER
3
2
1½
1
3½
2.50
7.00 3.50 2.00
4.31
5
10.00 5.00 3.00 3.625 7.250 1.12 5.635
1.00 4.5503.000 6.000
5
8.50 4.25
1.00 4.045
3.44
3.540
4
8.00 4.00 2.50 2.750 5.500 3.00
2.375 4.750 2.62 .75
2.12 .755.50 2.75 1.75 1.875 3.750 2.911
.62 2.411
1.920
5.00 2.50 1.75 1.750 3.500 1.69
1.375 2.750 1.34 .624.00 2.00
1.16 .504.00 2.00 1.25 1.375 2.750
1.50
.81
1.680
.50 1.3353.00 1.50
.611.00 .875 1.750
1.00 1.000 2.000
.50 1.070
.50 .860
2.50 1.25
1.00 .719 1.438 .502.25 1.12
MOUNTING KIT
WTA B C D E F
G
H
J
K
½
¾
2
¾
1
1¼
2½
4
3½
3
2½
1½
1¼
10.7
8.4
9.5
63.3
38.6
35.5
22.0
11.6
10.2
5.4
4.7
2.0
1.4
1.2
½
.66 MK 530 5/8-11 x 2 1/4 228
5/8-11 --------- --------- ---
1.94 .624.00 2.00 1.25 1.375 2.750 2.411
3.8
.66 MK 530 5/8-11 x 2 1/4 228
5/8-11 --------- --------- ---
1.50 .624.00 2.00 1.25 1.375 2.750 1.920
4.4
.53 MK 529 1/2-13 x 1 3/4 222
1/2-13 --------- --------- ---
1.25 .503.00 1.50 1.00 1.000 2.000 1.680
1.8
.53 MK 529 1/2-13 x 1 3/4 222
1/2-13 --------- --------- ---
1.00 .503.00 1.50 1.00 1.000 2.000 1.335
2.0
.41 MK 528 3/8-16 x 1 3/4 216
3/8-16 --------- --------- ---
.75 .502.25 1.12 1.00 .719 1.438 1.070
1.1
1387-64-64 1.06 MK 572 1-8 x 3 1/2 347
1388-64-64 1-8 --------- --------- ---
1387-80-80 1.06 MK 590 1-8 x 4 355
1388-80-80 1-8 --------- --------- ---
4
5
7.00 3.50 2.00
1.00 5.635
4.550
8.00 4.00 2.50 3.000 6.000 4.81
2.500 5.000 3.88 .75
5
4
28.0
18.3
MATERIAL: Low Carbon Steel
3000 SERIES SQUARE BOLT PATTERN
6000 SERIES SQUARE BOLT PATTERN
1387-96-96 1.31 MK 573 1 1/4-7 x 4 1/2 362
1388-96-96 1 1/4-7 --------- --------- ---
6
1.00 6.69710.00 5.00 2.50 3.500 7.000 5.75
6
46.0
F F
DRILL-G TAP-J
K K
Companion Style
(Flat Face)
B
A
B
A
D
E
D
E
H
C
H
C
O-Ring Style
Model 1387 / 1389 Model 1388 / 1390
