Littelfuse.com/PSR

© 2022 Littelfuse, Inc.

Rev: 042722

6 of 20

PSR SERIES HIGH-SPEED SQUARE BODY

Dimensions

DIMENSIONS IN MM (IN)

CASE

SIZE

A

B

C

D

E

F

G

FL METRIC

THREAD

FS INCHES

THREAD

RECOMMENDED

TORQUE

30

50.0 (1.97) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.67) 47.4 (1.86)

76.4 (3.01)

M8 x 1.25

5/16”–18 UNC 2B

13–20 Nm

31

50.0 (1.97) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26)

20.0 (0.8)

48.2 (1.90)

84.9 (3.34)

M8 x 1.25

5/16”–18 UNC 2B

13–20 Nm

32

51.0 (2.01) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 48.8 (1.92)

93.4 (3.68)

M10 x 1.5

3/8”–16 UNC 2B

26–35 Nm

33

51.0 (2.01) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 49.2 (1.94) 106.9 (4.21) M12 x 1.75

1/2”–13 UNC 2B

45–55 Nm

70

74.0 (2.91) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.67) 71.4 (2.81)

76.4 (3.01)

M8 x 1.25

5/16”–18 UNC 2B

13–20 Nm

71

74.0 (2.91) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26) 20.0 (0.79) 72.2 (2.84)

84.9 (3.34)

M8 x 1.25

5/16”–18 UNC 2B

13–20 Nm

72

75.0 (2.95) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 72.8 (2.87)

93.4 (3.68)

M10 x 1.5

3/8”–16 UNC 2B

26–35 Nm

73

75.0 (2.95) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 73.2 (2.88) 106.9 (4.21) M12 x 1.75

1/2”–13 UNC 2B

45–55 Nm

CHICAGO, ILLINOIS 60631

3RD ANGLE

PROJECTION

5

PSR SERIES

TITLE

C

DRW

DATE

GRAMS/PIECE

FINISH GOOD WT

myork

1/30/2017

MATL SPEC

FINISH

UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE IN MILLIMETERS, DIMENSIONS IN

BRACKETS [ ] ARE INCHES DIMENSIONING AND DO NOT INCLUDE PLATING. TOLERANCING

TO BE INTERPRETED IN ACCORDANCE WITH ANSI Y14.5M-1994

DENOTES CRITICAL CHARACTERISTICS.

DENOTES CPK DIMENSIONS, -MINIMUM CPK VALUE

DENOTES A CHARACTERISTIC THAT PROVIDES AN INDICATION

OF PROCESS PERFORMANCE. PROCEDURE FOR MEASUREMENT

AND TRACKING TO BE DEFINED IN

LITTELFUSE INSPECTION INSTRUCTIONS.

DENOTES CP DIMENSIONS, -MINIMUM CP VALUE

MUST BE WITHIN THE DIMENSIONAL LIMITATIONS

SHOWN ON DRAWING AND INITIALLY LOCATED TO

ALLOW FOR MAXIMUM TOOL LIFE.

CPK

CP

SHEET 1 OF 1

SCALE

PSR SERIES OUTLINE

NTS

REVISION

REV

DATE

DESCRIPTION

1

1/30/17

UNCONTROLLED DOCUMENT MRY

2

3/1/17

ADD THREAD DIMENSIONS MRY

3

3/2/17

UPDATE THREAD COLUMN HEADERS MRY

4

4/24/17

CHANGE 33 DIM A MRY

5

11/5/18

CHG DIM A, ADD SIZE 31, 70 & 73, ADD NEW VIEW MRY

E

C

B

D

G

A

F

DIMENSIONS MM (IN)

CASE SIZE

A

B

C

D

E

F

G

FL METRIC THREAD FS INCHES THREAD

RECOMMENDED

TORQUE

30

49.0-51.0

(1.93-2.01) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.67) 47.4 (1.86) 76.4 (3.01)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

31

49.0-51.0

(1.93-2.01) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26) 20.0 (0.80) 48.2 (1.90) 84.9 (3.34)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

32

50.0-52.0

(1.97-2.05) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 48.8 (1.92) 93.4 (3.68)

M10x1.5

3/8"-16 UNC-2B

26-35 Nm

33

50.0-52.0

(1.97-2.05) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 49.2 (1.94) 106.9 (4.21)

M12x1.75

1/2"-13 UNC-2B

45-55 Nm

70

73.0-75.0

(2.87-2.95) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.70) 741.4 (2.81) 76.4 (3.01)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

71

73.3-74.7

(2.89-2.94) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26) 20.0 (0.79) 72.2 (2.84) 84.9 (3.34)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

72

74.0-76.0

(2.91-2.99) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 72.8 (2.87) 93.4 (3.68)

M10x1.5

3/8"-16 UNC-2B

26-35 Nm

73

74.0-76.0

(2.91-2.99) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 73.2 (2.88) 106.9 (4.21)

M12x1.75

1/2"-13 UNC-2B

45-55 Nm

FL/FS

VISUAL

INDICATOR

1/4" QC

TERMINAL

M4x0.7 THREAD

10.00 (.394)

STUD LENGTH

CHICAGO, ILLINOIS 60631

3RD ANGLE

PROJECTION

5

PSR SERIES

TITLE

C

DRW

DATE

GRAMS/PIECE

FINISH GOOD WT

myork

1/30/2017

MATL SPEC

FINISH

UNLESS OTHERWISE SPECIFIED, DIMENSIONS ARE IN MILLIMETERS, DIMENSIONS IN

BRACKETS [ ] ARE INCHES DIMENSIONING AND DO NOT INCLUDE PLATING. TOLERANCING

TO BE INTERPRETED IN ACCORDANCE WITH ANSI Y14.5M-1994

DENOTES CRITICAL CHARACTERISTICS.

DENOTES CPK DIMENSIONS, -MINIMUM CPK VALUE

DENOTES A CHARACTERISTIC THAT PROVIDES AN INDICATION

OF PROCESS PERFORMANCE. PROCEDURE FOR MEASUREMENT

AND TRACKING TO BE DEFINED IN

LITTELFUSE INSPECTION INSTRUCTIONS.

DENOTES CP DIMENSIONS, -MINIMUM CP VALUE

MUST BE WITHIN THE DIMENSIONAL LIMITATIONS

SHOWN ON DRAWING AND INITIALLY LOCATED TO

ALLOW FOR MAXIMUM TOOL LIFE.

CPK

CP

SHEET 1 OF 1

SCALE

PSR SERIES OUTLINE

NTS

REVISION

REV

DATE

DESCRIPTION

1

1/30/17

UNCONTROLLED DOCUMENT MRY

2

3/1/17

ADD THREAD DIMENSIONS MRY

3

3/2/17

UPDATE THREAD COLUMN HEADERS MRY

4

4/24/17

CHANGE 33 DIM A MRY

5

11/5/18

CHG DIM A, ADD SIZE 31, 70 & 73, ADD NEW VIEW MRY

E

C

B

D

G

A

F

DIMENSIONS MM (IN)

CASE SIZE

A

B

C

D

E

F

G

FL METRIC THREAD FS INCHES THREAD

RECOMMENDED

TORQUE

30

49.0-51.0

(1.93-2.01) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.67) 47.4 (1.86) 76.4 (3.01)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

31

49.0-51.0

(1.93-2.01) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26) 20.0 (0.80) 48.2 (1.90) 84.9 (3.34)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

32

50.0-52.0

(1.97-2.05) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 48.8 (1.92) 93.4 (3.68)

M10x1.5

3/8"-16 UNC-2B

26-35 Nm

33

50.0-52.0

(1.97-2.05) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 49.2 (1.94) 106.9 (4.21)

M12x1.75

1/2"-13 UNC-2B

45-55 Nm

70

73.0-75.0

(2.87-2.95) 43.0 (1.69) 43.0 (1.69) 49.0 (1.93) 17.0 (0.70) 741.4 (2.81) 76.4 (3.01)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

71

73.3-74.7

(2.89-2.94) 51.5 (2.03) 51.5 (2.03) 57.5 (2.26) 20.0 (0.79) 72.2 (2.84) 84.9 (3.34)

M8x1.25

5/16"-18 UNC-2B

13-20 Nm

72

74.0-76.0

(2.91-2.99) 60.0 (2.36) 60.0 (2.36) 66.0 (2.60) 23.0 (0.91) 72.8 (2.87) 93.4 (3.68)

M10x1.5

3/8"-16 UNC-2B

26-35 Nm

73

74.0-76.0

(2.91-2.99) 73.5 (2.89) 73.5 (2.89) 79.5 (3.13) 30.0 (1.18) 73.2 (2.88) 106.9 (4.21)

M12x1.75

1/2"-13 UNC-2B

45-55 Nm

FL/FS

VISUAL

INDICATOR

1/4" QC

TERMINAL

M4x0.7 THREAD

10.00 (.394)

STUD LENGTH

MICROSWITCH

(MS3H1000C/MS7H1500C)