Electronic Hardware Corporation

320 Broad Hollow Road, Farmingdale, NY 11735

PHONE:

631.752.1950 FAX: 631.752.1971 WWW.ehcknobs.com

EMAIL: sales@ehcknobs.com

1-800-752-1680

50

Features

Shaft Lock

All Plastic

Shaft Locks

EHC Shaft Locks prevent control shafts from rotating under conditions of shock, vibration, or accidental

contact. They form a dust and waterproof seal at the shaft and also at the panel surface. One-piece

construction, they are simple, effective, and inexpensive.

The Shaft Lock’s tapered nylon collar grips the control shaft tightly forming a dust and water-tight seal

and exerting an even frictional drag which resists accidental rotation. A molded lip at the outer edge

of the base compresses against the panel surface to complete the sealing function of the device. To

adjust the control smoothly and accurately, merely insert to screwdriver and turn — no unlocking and

relocking required. Tests have demonstrated no significant change in locking torque and water sealing

even after 10,000 full on — full off cycles.

Shaft Locks mount directly to the threaded bushings found on most potentiometers and other variable

controls. Simply discard the nuts and washers supplied with the control, slip on the Shaft Lock, and

tighten with any type of standard 1/2 inch wrench. Once in place, the Shaft Lock need never be

loosened — a distinct advantage over conventional two-piece metal split bushing types.

Shaft Locks are available for 1/4 inch and 1/8 inch control shafts. Model SL-110B is designed specifically

for use with .90 diameter standard EHC control knobs (see pages 2 through 5). SL-110B fits underneath

the .90 diameter knob and is completely out of sight. It is often a replacement for more expensive and

complicated locking devices and provides the same high quality performance as the regular models.

When mounting SL-110B, it is sometimes advisable to mount the standard mounting nut behind the

panel if the control’s threaded bushing projects too far.

SL100B & SL101R

1/4" Model

SL110B

Knob Locking Model

1/4" Model

SL105B

1/8" Model

AK-1047

5/16" Hex OD

C

D

A

B

;;;

;;;

;;;

;;;

• Water and dust seal at shaft and panel

• Resists shock and vibration

• Tested for humidity, water immersion, and

temperature shock.

• Passes 10,000 life cycling test

Material: Nylon

• Control adjustments may be without

untightening nut

• One-piece construction

• Mounts with standard tools

• Highest quality materials

Material and

Specification Data

Nylon – MIL-M-20693

Insert – Brass per QQ-B-626 Nickel plated

per QQ-N-290, Class 1, Type V

Shock – 50 g’s

Vibration – 5 hours at 10 to 55 cps with

amplitude of 0.06"

Water Immersion – 50 hours under 3 ft. head

of water. Control shaft

rotated every 10 hours.

Temperature Shock – Five cycles of

30 minutes at

each extreme,

-55°C and +85°C

Humidity – 150 hours at 95%

relative humidity 40°C

Life Wear – 10,000 complete cycles

Part Number

A

B

C

D

Diam. max.

Height max.

Diam. max.

Depth max.

SL-100B

.480

.348

.630

.505

SL-101R

.480

.348

.630

.505

SL-105B

.317

.223

.455

.380

SL-110B

.286

.187

.630

.505

ORDERING GUIDE FOR SHAFT LOCKS

Control Bushing

Thread Size

3

⁄8 - 32 NEF-2

3

⁄8 - 32 NEF-2

1

⁄4 - 32 NEF-2

3

⁄8 - 32 NEF

Series

SL-100B

SL-101R

SL-105B

SL-110B

Standard Models

Knob Locking Model*

Series

Black

Red

Black

Black

For

Shaft

Size

1

⁄4”

1

⁄4”

1

⁄8”

1

⁄4”

*Use with any .90 diameter, or larger, ring or dial skirted round, skirted pointer, or crank knob.

“B” dimension is the maximum thread height above the mounting panel.

;;;;;;;;;

;;;;;;;;;

;;;;;;;;;

;;;;;;;;;

;;;;;;;;;

;;;;;;;;;

A

F

B

C

D

E

G

Part Number

A

B

C

D

E

F

G

Diam.

Height Height

Height Diam. max. Diam.

Thread

AK1047-2-4

.288

.230

.180

.078

.355

.113

1/4-32

AK1049-2-4

.437

.257

.197

.120

.505

.113

1/4-32

AK1049-2-6

.437

.257

.197

.120

.505

.113

3/8-32

AK1049-4-6

.437

.257

.197

.120

.505

.240

3/8-32

Shaft Locks