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Precision Compression Clamp
Systems
PRECISION COMPRESSION MOUNTING CLAMP SYSTEMS
Wakefield Engineering compression pack heat sinks and clamp systems provide electrical and
industrial equipment manufacturers with complete system solutions for proper installation and
heat dissipation for high-power compression pack semiconductor. All components for device
mounting and cooling are available separately for all standard compression requirements from
800 lbs (362.9 kg) to 16,000 lbs (7,257.5 kg) force in both natural and forced convection ap-
plications.
Clamp Assembly
Series
130 Series
139 Series
143 Series
144 Series
145 Series
146 Series
131/132/133 Series
Maximum Clamping Force
Force Range
800 lbs (362.9 kg) - 2,000 lbs (907.2 kg)
3,000 lbs (1,360.8 kg) and 5,000 lbs (2,268.0 kg)
1,000 lbs (453.6 kg) - 6,000 lbs (2,721.6 kg)
1,000 lbs (453.6 kg) - 6,000 lbs (2,721.6 kg)
2,000 lbs (907.2 kg) - 10,000 lbs (4,535.9 kg)
8,000 lbs (3,628.8 kg) - 16,000 lbs (7,257.5 kg)
High-Performance Press Pack Heat Sinks
Maximum Diameter (Ref)
Power Disc Device
2.25 in. (57.2 mm)
3.50 in. (88.9 mm)
3.50 in. (88.9 mm)
4.00 in. (101.6 mm)
4.50 in. (114.3 mm)
5.25 in. (133.4 mm)
Crossbar Stud Centerline
to Centerline Dimension
2.750 in. (69.9 mm) Ref
4.000 in. (101.6 mm) Ref
4.000 in. (101.6 mm) Ref
4.625 in. (117.5 mm) Ref
5.500 in. (139.7 mm) Ref
6.000 in. (152.4 mm) Ref
These high-quality mounting clamp assemblies are the worldwide standard for mounting,
compression, and clamping press-pack SCR, thyristor, rectifier, and other high power disc
packaged devices utilized in power distribution equipment, industrial controls, transportation
systems, and power supply and conversion systems.
Clamp assemblies will accommodate devices with overall case diameters to 5.25 in. (133.4
mm) maximum. Vertical device mounting space available for assemblies is determined by se-
lecting an appropriate series crossbar by length which, when a series spring assembly is se-
lected (based on maximum clamping force required), will provide the necessary vertical clear-
ance space. For the 130 and 139 Series, this determination is made by subtracting the chosen
spring assembly “Z” dimension (refer to dimensional tables) from the crossbar assembly “X”
dimension minimum and maximum values, to calculate the available device mounting space
clearance for the particular assembly combination. Spring assembly “Z” dimension is the di-
mension measured from the spring assembly device mounting surface to the spring assembly
top surface. Some series have fixed dimensions for alpha characters. All spring assemblies are
designed with a force indicator gauge.
130 SERIES
Compression Mounting Clamp Assemblies for Semiconductors to 2.25 in. (57.2mm) Diameter
MECHANICAL DIMENSIONS
130 SERIES CROSSBAR
800 lb - 2,000 lb (362.8 kg - 907.2 kg)
Crossbar Device Mounting, Surface to Spring Assembly
Top Surface Dimension
Model
No.
130-A
130-B
130-C
130-D
130-E
130-F
130-G
130-H
130-J
130-K
130-L
130-M
130-N
130-P
“X” Dimension
Min.
Max.
In. (mm)
1.74 (44.2)
2.05 (52.1)
2.36 (59.9)
2.67 (67.8)
2.98 (75.7)
3.29 (83.6)
3.60 (91.4)
3.91 (99.3)
4.22 (107.2)
4.53(115.1)
4.34 (122.9)
5.15 (130.8)
5.46 (138.7)
5.77 (146.6)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2.12 (53.8)
2.43 (61.7)
2.74 (69.6)
3.05 (77.5)
3.36 (85.3)
3.67 (93.2)
3.98 (101.1)
4.29 (109.0)
4.60 (116.8)
4.91 (124.7)
5.22 (132.6)
5.53 (140.5)
5.84 (147.3)
6.15 (156.2)
Weight
lbs. (grams)
0.4 (181.44)
0.418 (189.60)
0.427 (193.68)
0.437 (198.22)
0.447 (202.76)
0.461 (209.11)
0.476 (215.91)
0.486 (220.45)
0.497 (225.44)
0.51 (231.33)
0.52 (235.87)
0.534 (242.22)
0.544 (246.75)
0.559 (253.56)
130 SERIES SPRING ASSEMBLY
Model
No.
130-1
130-2
130-3
130-4
130-5
No. of
Leaves
2
2
3
4
5
“Z”Dim.
in. (mm)
0.90 (22.9)
0.50 (12.7)
0.61 (15.5)
0.72 (18.3)
0.83 (21.1)
Max Force
lb (kg)
2,000 (907.2)
800 (362.8)
1,200 (544.3)
1,600 (727.8)
2,000 (907.2)
Weight
lbs (gms)
0.331 (150.14)
0.19 (86.18)
0.219 (99.34)
0.333 (151.05)
0.408 (185.07)
Dimensions: in. (mm)
Notes:
1. Spring assemblies are stainless steel leaves with a force indicator
gauge, except the lowest cost Type 130-1 spring assembly manufac-
tured from automotive grade stainless steel.
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions:
in. (mm)
lb. (kg)
57
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Precision Compression Clamp
Systems
PRECISION COMPRESSION MOUNTING CLAMP SYSTEMS
139 SERIES
Compression mounting clamp assemblies for semiconductors to 3.50 in. (88.9 mm) Diameter
139 SERIES CROSSBAR
3,000 lb - 5,000 lb, (1,360.8 kg - 2,268.0 kg), Crossbar Device Mounting, Surface to Spring Assembly, Top Surface Dimension
139-3 SERIES CROSSBAR - 3,000 LB (1,360.8)
139-5 SERIES CROSSBAR - 5,000 LB (2,268.0)
Model
No.
139-3A
139-3B
139-3C
139-3D
139-3E
139-3F
139-3G
139-3H
130-3J
139-3K
139-3L
139-3M
139-3N
139-3P
“X” Dimension
Min
in. (mm)
1.52 (38.6)
1.83 (46.5)
2.14 (54.4)
2.45 (62.2)
2.77 (70.4)
3.08 (78.2)
3.39 (86.1)
3.70 (94.0)
4.01 (101.9
4.33 (110.0)
4.64 (117.9)
4.95 (125.7)
5.26 (133.6)
5.57 (141.5)
–
–
–
–
–
–
–
–
–
–
–
–
–
–
1.89 (48.0)
2.21 (56.1)
2.52 (64.0)
2.83 (71.9)
3.14 (79.8)
3.45 (87.6)
3.77 (95.8)
4.08 (103.6)
4.39 (111.5)
4.70 (119.4)
5.01 (127.3)
5.33 (135.4)
5.64 (143.3)
5.95 (151.1)
Max
Weight
lbs. (grams)
0.689 (312.52)
0.7 (317.51)
0.706 (320.24)
0.721 (327.04)
0.732 (332.03)
0.741(336.11)
0.762 (345.64)
0.773 (350.63)
0.784 (355.62)
0.79 (358.34)
0.793 (359.70)
0.796 (361.06)
0.832 (377.39)
0.838 (380.11)
Model
No.
139-5A
139-5B
139-5C
139-5D
139-5E
139-5F
139-5G
139-5H
139-5J
139-5K
139-5L
139-5M
139-5N
139-5P
Min
“X” Dimension
Max
in. (mm)
–
–
–
–
–
–
–
–
–
–
–
–
–
–
1.89 (48.0)
2.21 (56.1)
2.52 (64.0)
2.83 (71.9)
3.14 (79.8)
3.45 (87.6)
3.77 (95.8)
4.08 (103.6)
4.39 (111.5)
4.70 (119.4)
5.01 (127.3)
5.33 (135.4)
5.64 (143.3)
5.95 (151.1)
Weight
lbs. (grams)
0.94 (426.38)
0.96 (435.45)
0.98 (444.52)
1.01 (458.13)
1.02 (462.66)
1.033 (468.56)
1.053 (477.63)
1.074 (487.64)
1.064 (482.62)
1.075 (487.61)
1.088 (493.51)
1.102 (499.86)
1.11 (503.49)
1.171 (531.16)
1.52 (38.6)
1.83 (46.5)
2.14 (54.4)
2.45 (62.2)
2.77 (70.4)
3.08 (78.2)
3.39 (86.1)
3.70 (94.0)
4.33 (101.9)
4.33 (110.0)
4.64 (117.9)
4.95 (125.7)
5.26 (133.6)
5.57 (141.5)
CROSSBAR HEIGHT AND WIDTH
Series
Number
139-3
139-5
Height “A" Reference
in. (mm)
0.72 (18.3)
1.02 (25.9)
Width “B”
Reference in. (mm)
0.95 (24.1)
0.83 (21.1)
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions:
in. (mm)
lb. (kg)
139 SERIES SPRING ASSEMBLY
Model
Number
139-1
139-2
Number of
Leaves
1
2
"Z" Dimension
in. (mm)
0.87(22.1)
1.25(31.8)
Maximum Force
lb. (kg)
3,000 (1,360.8)
5,000 (2,268.0)
MECHANICAL DIMENSIONS
Dimensions: in. (mm)
58
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Precision Compression Clamp
Systems
PRECISION COMPRESSION MOUNTING CLAMP SYSTEMS
143 SERIES
Compression Mounting Clamp Assemblies for Semiconductors to 3.50 in (88.9 mm) Diameter
143 SERIES CROSSBAR
2,000 lb - 6,000 lb (907.2 kg - 2,721.6 kg)
Crossbar Device Mounting, Surface to Spring Assembly, Top Surface Dimension
MECHANICAL DIMENSIONS
Overall
Height “H”
In. (mm)
4.68 (118.9)
5.18 (131.6)
5.68 (144.3)
6.18 (157.0)
6.68 (169.7)
7.18 (182.4)
1.68 (195.1)
8.18 (207.8)
8.68 (220.5)
9.18 (233.2)
9.68 (245.9)
Model
No.
143-A
143-B
143-C
143-D
143-E
143-F
143-G
143-H
143-J
143-K
143-L
“X” Dimension
Min
In. (mm)
1.30 (33.0)
1.86 (45.7)
2.30 (58.4)
2.80 (71.1)
3.30 (83.8)
3.80 (96.5)
4.30 (109.2)
4.80 (121.9)
5.30 (134.6)
5.80 (147.3)
6.30 (160.0)
–
–
–
–
–
–
–
–
–
–
–
1.80 (45.7)
2.30 (58.4)
2.80 (71.1)
3.30 (83.8)
3.80 (96.5)
4.30 (109.2)
4.80 (121.9)
5.30 (134.6)
5.80 (147.3)
6.30 (160.0)
6.80 (172.7)
Max
Weight
lbs. (grams)
1.100 (498.95)
1.125 (510.29)
1.150 (521.63)
1.175 (532.97)
1.200 (544.31)
1.225 (555.65)
1.250 (566.99)
1.275 (578.33)
1.300 (589.67)
1.325 (601.00)
1.350 (612.35)
Dimensions: in. (mm)
143 SERIES SPRING ASSEMBLY
Model
Number
143-2
Number of
Leaves
2
Max. Clamping
Force lb. (kg)
6,000 (2,721.6)
Weight
lb. (grams)
0.813 (368.77)
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions:
in. (mm)
lb. (kg)
144 SERIES
Compression Mounting Clamp Assemblies for Semiconductors to 4.00 in (101.6mm) Diameter
MECHANICAL DIMENSIONS
144 SERIES CROSSBAR
1,000 lb - 6,000 lb (453.6 kg - 2,721.6 kg)
Crossbar Device Mounting, Surface to Spring Assembly
Top Surface Dimension
Model
No.
144-A
144-B
144-C
144-D
144-E
“X” Dimension
Min
In. (mm)
1.50 (38.1)
2.00 (50.8)
2.50 (63.5)
3.00 (76.2)
3.50 (88.9)
–
–
–
–
–
2.00 (50.8)
2.50 (63.5)
3.00 (63.5)
3.50 (88.9)
4.00 (101.6)
Max
Weight
lbs (grams)
1.231 (558.37)
1.262 (572.43)
1.285 (582.87)
1.310 (594.21)
1.352 (613.26)
144 SERIES SPRING ASSEMBLY
Model
No.
144-2
Clamping Force Range
lb (kg)
1,000 (453.6) – 6,000 (2,721)
Dimensions:
in. (mm)
lb. (kg)
Weight
lbs (grams)
1.772 (803.77)
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions: in. (mm)
59
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Precision Compression Clamp
Systems
PRECISION COMPRESSION MOUNTING CLAMP SYSTEMS
145 SERIES
Compression Mounting Clamp Assemblies for Semiconductors to 4.50 in (114.3 mm) Diameter
145 SERIES CROSSBAR
2,000 lb - 10,000 lb (907.2 kg - 4,535.9 kg)
Crossbar Device Mounting, Surface to Spring Assembly, Top Surface Dimension
Model
No.
“X” Dimension
Min
In. (mm)
1.75 (44.5)
2.50 (63.5)
3.25 (82.6)
4.00 (101.6)
4.75 (120.7)
5.50 (139.7)
–
–
–
–
–
–
Max
2.50 (63.5)
3.25 (82.6)
4.00 (101.6)
4.75 (120.7)
5.50 (139.7)
6.25 (158.8)
Overall
Height “H”
In. (mm)
6.00 (152.4)
6.75 (171.5)
7.50 (190.5)
8.25 (209.6)
9.00 (228.6)
9.75 (247.7)
Weight
lbs. (grams)
3.845 (1744.06)
3.987 (1808.47)
4.06 (1841.58)
4.187 (1899.19)
4.37 (1982.20)
4.459 (2022.57)
MECHANICAL DIMENSIONS
145-A
145-B
145-C
145-D
145-E
145-F
145 SERIES SPRING ASSEMBLY
Model
No.
145-2
Clamping Force Range
lb (kg)
2,000 (907.2) – 10,000 (4,535.9)
Weight
lbs (grams)
2.01 (911.72)
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions:
in. (mm)
lb. (kg)
Dimensions: in. (mm)
146 SERIES
Compression Mounting Clamp Assemblies for Semiconductors to 5.25 in (133.5 mm) Diameter
146 SERIES CROSSBAR
8,000 lb -16,000 lb (3,628.7 kg - 7,257.4 kg)
Crossbar Device Mounting, Surface to Spring Assembly, Top Surface Dimension
Model
No.
146-A
146-B
146-C
146-D
146-E
146-F
146-G
“X” Dimension
Min
In. (mm)
1.54 (39.1)
2.29 (58.2)
3.04 (77.2)
3.79 (96.3)
4.54 (115.3)
5.29 (134.4)
6.04 (153.4)
–
–
–
–
–
–
–
Max
2.29 (58.2)
3.04 (77.2)
3.79 (96.3)
4.54 (115.3)
5.29 (134.4)
6.04 (153.4)
6.79 (172.5)
Overall
Height “H”
In. (mm)
5.92 (150.4)
6.67 (169.4)
7.42 (188.5)
8.17 (207,5)
8.92 (226.6)
9.67 (245.6)
10.42 (264.7)
Weight
lbs. (grams)
3.813 (1729.55)
3.938 (1786.25)
4.063 (1842.95)
4.188 (1899.64)
4.313 (1956.34)
4.438 (2013.04)
4.563 (2069.74)
MECHANICAL DIMENSIONS
146 SERIES SPRING ASSEMBLY
Model
Number
146-2
Number of
Leaves
2
Clamping Force Range
lb (kg)
8,000 (3,628.7) - 16,000 (7,257.5)
Maximum Force
lb (grams)
2,688 (1,219.26)
Order Guide:
Order Crossbar and Spring Assembly
separately by type number from table.
Dimensions:
in. (mm)
lb. (kg)
Dimensions: in. (mm)
60
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Precision Compression Clamp
Systems
132/133 SERIES HIGH-PERFORMANCE HEAT SINKS FOR COMPRESSION TYPE DEVICES
132/133 SERIES
Dimensions:
in.(mm)
Finish:
B = Black Anodized
G = Gold Iridite
Material:
Aluminum Alloy
Thermal Performance
at Typical Load
(2)
Natural
Convection
Convection (°C/W) @
(°C/W)
(3)
500 LFM)
0.61
0.38
0.28
0.61
0.37
0.37
0.28
0.26
0.37
0.28
0.24
0.170
0.130
0.100
0.170
0.120
0.110
0.085
0.082
0.110
0.085
0.076
MULTIPLE ASSEMBLY CONFIGURATION
Standard P/N
Black
Gold
Anodize
(4, 5)
Iridite
132-4.5B
132-10B
132-15.5B
132-5-B9
132-11-B9
133-4.5B
133-7.5B
133-10B
133-5-B9
133-7.5-B9
133-11-B9
132-4.5G
132-10G
132-15.5G
132-5-G9
132-11-G9
133-4.5G
133-7.5G
133-10G
133-5-G9
133-7.5-G9
133-11-G9
Width
in. (mm)
5.000 (127.0)
5.000 (127.0)
5.000 (127.0)
5.000 (127.0)
5.000 (127.0)
7.000 (139.2)
7.000 (139.2)
7.000 (139.2)
7.000 (139.2)
7.000 (139.2)
7.000 (139.2)
Nominal Dimensions:
(1)
Length “A”
in. (mm)
4.500 (114.3)
10.000 (254.0)
15.500 (393.7)
5.000 (127.0)
11.000 (299.4)
4.500 (114.3)
7.500 (190.5)
10.000 (254.0)
5.000 (127.0)
7.500 (190.5)
11.000 (279.4)
Height
in. (mm)
2.250 (57.2)
2.250 (57.2)
2.250 (57.2)
2.250 (57.2)
2.250 (57.2)
3.125 (79.4)
3.125 (79.4)
3.125 (79.4)
3.125 (79.4)
3.125 (79.4)
3.125 (79.4)
Clamp
System
Series
(5)
130
130
130
139
139
130
130
130
139
139
139
Type
132-4.5
132-10
132-15.5
133-4.5
133-7.5
133-10
132-5-9**
132-11-9**
133-5-9**
133-7.5-9**
133-11-9**
Use with
–
2 ea 132-4.5
3 ea 132-4.5
–
–
2 ea 133-4.5
–
2 ea 132-5-9
–
–
2 ea 133-5-9
A
2.25
2.25
–
–
2.25
–
2.50
–
–
2.50
B
5.50
5.50
C
D
10.0
15.5
Notes:
1. Nominal dimensions for one heat sink of this type.
2. Thermal performance values shown are per pair of heat sinks.
3. Natural convection performance at 50°C heat sink rise above
ambient.
4. Black anodize finish [1.875 in. (47.6 mm) diameter spot
face. Device mounting surface area free of finish].
5. Predrilled heat sinks accept 130 and 139 Series clamp
systems.
See Fig.132
–
5.50
See Fig.133
See Fig.133
5.50
–
See Fig.132
6.00
- 11.00
See Fig. 133
See Fig. 133
6.00
–
10.0
11.00
** -9 indicates heat sinks drilled for 139 clamp.
NATURAL AND FORCED CONVECTION CHARACTERISTICS
132 SERIES
NATURAL AND FORCED CONVECTION CHARACTERISTICS
133 SERIES
MECHANICAL DIMENSIONS
(EXTRUSION PROFILE 3560-2)
MECHANICAL DIMENSIONS
(EXTRUSION PROFILE 3559-2)
Series
**132-4.5
**132-10
**132-15.5
**132-5-9
**132-11-9
Series
**133-4.5
**133-7.5
**133-10
**133-5-9
**133-7.5-9
**133-11-9
Dimensions: in. (mm)
61
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