Specification of bolt

M2.5

M3.0

M3.5

M4.0

M5.0

M6.0

Used for connection

With heads

0.40

0.50

0.80

1.20

2.00

2.5

Without heads

0.20

0.25

0.40

0.70

0.8

Used as terminal

0.40

0.50

1.14

2.28

4.00

8.00

Used as mounting parts

—

1.00

2.00

4.20

—

...

9.2 Soldering and cleaning

   The terminals should be soldered with the litmusless resin-type flux, not acidic flux. After soldering, the relay must be cleaned and dried. The wattage of the soldering iron is appropriate between 30~60W; the highest tip temperature is appropriate between 280~330℃; the soldering time is 3s max. In automatic soldering , the temperature of molten solder is 260℃; the soldering time is 5s max. When soldering and cleaning, the un-sealed relay must be protected to avoid polluting the inner construction by the flux and cleaning solvent; the hermetic and washable plastic-sealed relays can be immersed to the cleaning solvent when cleaning.

9.3 Preventing enlargement of vibration

   For the relay with requirements of vibration resistance, choosing the suitable mounting method can prevent or lessen the enlargement of vibration. The best means is to mount the relay at the position that the direct of the vibration is vertical to the movement direct of the armature. Avoid choosing the relays mounted with top crew bolt or bracket.

9.4 Adjacent mounting method of several relays

   When several relays are mounted on a PCB or a card rack, abnormally high temperature may result from the combined heat. The relay without magnet-screen cover may operate abnormally because of the magnetic influence. The question can be settled by the means of mounting the relays with sufficient space between them or mounting other components (that can not produce strong heat and magnetic field; can bear certain influence of heat and magnet) between them.