Specifications

As the leading manufacturer of
precision ball-actuated switches,
Pollak
®
has provided custom switches
to meet the requirements of OEM's and
aftermarket suppliers. Typical
applications include: neutral and top
gear sensing, back-up lamp switching,
anti-lock brake switching, power take-
off interlock and operator presence
detecting. The switches shown here
represent the transportation industry’s
most commonly requested
configurations. If the switch you need
cannot be found on these charts, please
contact us for your specific
requirements.
21-481
Turret Terminals
CHARACTERISTICS:
 Normally Open - Exposed Terminals
CHARACTERISTICS:
 Normally Closed - Exposed Terminals
27
Part
No.
Thread Hex Free Position Make/Break
Connector
Terminals
Mating
Connector
Special Features
21-361
9/16-18 7/8 .421 / .416 (10.69-10.57) .406 / .391 (10.31-09.93) Stud Terminals
21-381 9/16-18 7/8 .765 / .760 (19.43-19.30) .730 / .715 (18.54-18.16) Turret Terminals
21-458 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Screw Terminals Ring Terminals
21-481 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Turret Terminals PE 02973407
21-487 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Screw Terminals Ring Terminals 21-458 with O-Ring
21-509 3/4-16 7/8 .577 / .551 (14.15-14.00) .533 / .513 (13.54-13.03) Screw Terminals
PRECISION BALL
SWITCHES
21-458
Screw Terminals
All contacts are silver plated
ETP copper for contact
reliability and long life.
Connectors/ terminations
match preferred OEM
termination and harness
practices.
Precision over-travel
mechanism assures
contact under all
operation conditions.
Free-rolling chrome steel
ball accommodates most
rail, cam and lever
actuators
Cold-rolling steel body, zinc plated
and enhanced with chromate coating,
provides strength and environmental
resistance to surpass application
requirements.
Premium grade silicone gasket and
Teflon diaphragm prevent moisture
and other contaminants from entering
the contact chamber.
21-456
.250 Blade
Terminals
21-517
.250 Blade
Terminals
Part
No.
Thread Hex Free Position Make/Break
Connector
Terminals
Mating
Connector
Special Features
21-434
9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Turret PE 02973407
21-435 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Screw Ring Terminals
21-437 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) Screw Ring Terminals Plating
21-448 3/4-16 7/8 .606 / .601 (15.39-15.27) .600 / .384 (15.24-14.86) Screw Ring Terminals Aluminum Washer resist Corrosion
21-456 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) .250 Blade Rect. Receptacle Term
21-517 9/16-18 7/8 .421 / .416 (10.69-10.57) .408 / .390 (10.36-09.93) .250 Blade Rect. Receptacle Term 21-456 With O-ring