Quantcast Jumper Fasteners

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MIL-HDBK-419A
1.7.3.1 Jumper Fasteners.  Acceptable fastener materials for bonding aluminum and copper jumpers to
structures are indicated in Table 1-27. The arrangement of the metals is in the order of decreasing galvanic
activity. The screws, nuts, and washers to be used in making the connections as indicated are:
Type I - Cadmium or zinc plated steel, or aluminum
Type II - Passivated stainless steel
Where either type of securing hardware is indicated, Type II is preferred from a corrosion standpoint.
Table 1-27
Metal Connections for Aluminum and Copper Jumpers
Connection
For Tinned
Screw
Screw
Metal Structure
Connection For
Type
Copper Jumper
(Outer Finish Metal)
Aluminum Jumper
Type
Aluminum or
Direct or Magnesium
Magnesium and Magnesium
Type I
Type I
Magnesium
washer
alloys
washer
Aluminum washer
Direct
Zinc, Cadmium, Aluminum
Type I
Type I
and Aluminum alloys
Direct
Direct
Steel (except stainless
Type I
Type I
steel)
Direct
Direct
Tin, Lead, and Tin-lead
Type I
Type I
or II
Direct
Tinned or Cadmium
Copper and Copper
Type I
Type I
or II
or II
plated washer
Tinned or Cadmium
Direct
Nickel and Nickel
Type I
Type I
or II
plated washer
or II
alloys
Tinned or Cadmium
Direct
Stainless Steel
Type I
Type I
or II
plated washer
or II
Tinned or Cadmium
Direct
Silver, Gold and
Type I
Type I
or II
plated washer
or II
precious metals
1-147





 


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