Thread Reducers - Metric to Metric Threads

Part Numbers

Threads

Adapter Type

Dimensions in Inches (mm)

Male

Thread

A

Female Thread

B

T

H

D

W

Thread Length

Height

Inner Diameter

Wrench Flat

M16 x 1.5

M12 x 1.5

C

.31 (8)

.55 (14)

.39 (10)

.79 (20)

M16 x 1.5

C

.31 (8)

.55 (14)

.53 (13.5)

.98 (25)

M20 x 1.5

C

.31 (8)

.55 (14)

.71 (18)

1.14 (29)

M32 x 1.5

M25 x 1.5

C

.39 (10)

.63 (16)

.91 (23)

1.42 (36)

M40 x 1.5

M32 x 1.5

D

.59 (15)

.79 (20)

1.18 (30)

N/A

M50 x 1.5

M40 x 1.5

D

.59 (15)

.79 (20)

1.50 (38)

N/A

M63 x 1.5

M50 x 1.5

D

.59 (15)

.79 (20)

1.89 (48)

N/A

Thread Reducers - NPT to NPT Threads

Part Numbers

Threads

Adapter Type

Dimensions in Inches (mm)

Male

Thread 

Female

Thread 

T

H

D

Thread Length

Height

Inner Diameter

3/4” NPT

1/2” NPT

C

.637 (16.2)

.887 (22.5)

.696 (17.7)

3/4” NPT

3/8” NPT

C

.625 (15.9)

.875 (22.2)

.696 (17.7)

1” NPT

1/2” NPT

C

.65 (16.5)

.90 (22.9)

.91 (23.1)

1” NPT

3/4” NPT

C

.65 (16.5)

.90 (22.9)

.92 (23.4)

1/2” NPT

1/4” NPT

C

.566 (14.4)

.816 (20.7)

.56 (14.2)

1/2” NPT

3/8” NPT

C

.574 (14.6)

.824 (20.9)

.561 (14.2)