8976 Series
Rectangular Robotic Connectors
In the frame of Space Station Alpha program, SOURIAU has developed and qualified a series
of high reliability rectangular connector for robotic operations. This hardware is used on the
SSRMS (Space Station Remote Manipulator System) which is the Canadian contribution to
the Space Station. These connectors feature :
• Low Insertion Force contacts
• Thermal differential (between plug and receptacle) compatibility
• Integrated misalignement catching system
• High durability (6000 operations)
• High EMI shielding efficiency
• Associated dismountable EMI backshells
• Deep space environment (Atox) compatibility
• Easy inspection, maintenance or repair after wiring.
Characteristics
Performances
Mechanical
Mass
• < 105 g for plug
• < 76 g for MSSP
(1)
receptacle
• < 218 g for ORU
(2)
receptacle
ORU receptacle misalignment
•
Da
= ± 0,5°
•
DY
= 1,27 mm
•
D b
= ± 0,5°
•
DZ
= 2,03 mm
•
Dg
= ± 0,5°
ORU receptacle overstroke
•
DX
= 2,29 mm
(1)
MSSP : Mobile Servicing System Payload
(2)
ORU : Orbital Replacement Unit
Electrical
Contact resistance as per MIL-C 39029
Environmental conditions
Temperatures
Differential
Mating temperature
Pressure
Vacuum
Acceleration
Operational
Qualification
Non functional
Operational
Acceptance
Qualification
104,1 to 1,33.10
-11
Kpa
10
-5
to 10
-10
Torr
± 20 g
- 85°C to + 90°C
- 101°C to + 106°C
- 157°C to + 175°C
125°C
135°C
200°C
Materials and finishes
Material
Plug
MSSP Receptacle
ORU Receptacle
Compliance mechanism
Insulator
Backshell
• Frame, flange & beam
• Helicoil & axle
• Spring
Finish
Aluminium alloy 7075
Aluminium alloy 7075
Stainless steel
Beryllium copper
3505 EPOXY
Aluminium alloy 7075
Chemical nickel plating
Chemical nickel plating
-
Thermal treatment
-
Chemical nickel plating
Mating/demating forces
Shell size
Option
L1
L2
L3
L4
L5
M1
M2
M3
Contact arrangement
137 # 22
45 # 16
22 # 12
12 # 12, 12 # 20 & 46 # 22
12 # 12, 12 # 20 & 46 # 22 + grounding of coax lines
72 # 22
41 # 20
6 # 12, 8 # 20 & 17 # 22
94
Mating force (N)
101
116
112
108
138
53
43
52
Demating force (N)
78
87
85
82
119
43
37
42
Large
Medium
8976 Series
Rectangular Robotic Connectors
Contact layouts
All arrangements are seen from male front view.
Large
Option
Layout
contact
Nb
size
Configuration
Option
Layout
contact
Nb
size
Medium
Configuration
L1
137
# 22
M1
72
# 22
L2
45
# 16
M2
41
# 20
17
L3
22
# 12
M3
8
6
46
12
12
46
12
12
# 22
# 20
# 12
# 22
# 20
# 12
coax
# 22
# 20
# 12
L4
and
L6
(1)
L5
and
L7
(2)
(1) Option 4 with Captive Hardware (+CH)
(2) Option 5 with Captive Hardware (+CH)
Crimping, Insertion & Removal tools for contacts
Contact size
# 22
# 20
# 16
# 12
Contact part number
Pin
Socket
Pin
Socket
Pin
Socket
Pin
Socket
Inner pin
Inner socket
Crimping sleeve
8976-720
8976-710
8976-730
M81969/14-04
M22520/1-01
M22520/1-04
Crimping tools
M22520/2-01
Positioner
8976-700
M22520/2-07
Insertion and removal plastic tools
M81969/14-01
M81969/14-10
M81969/14-03
# 12 coax
M22520/5-01
95
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