From Kadee:

For Mounting with Limited Space.

Whisker Coupler 30-Series Coupler Equivalent Gearbox.

Those of you that have a challenge assembling our 30 series couplers there is an option to look at. By using our #252 draft gear box, and an appropriate Whisker Coupler is the equivalent to a 30-Series Coupler and so much easier to assemble. The Whisker Coupler choice has the same last digit as the 30-Series Coupler you want to duplicate. The last digit in each of our HO coupler series are the same configuration in each series. Couplers ending in 8 like the #28, #38, #58, #148, and #158 all are medium length center set couplers and this applies to all the series. So when you get to the point where 30 series couplers are difficult to assemble use a Whisker Coupler of the appropriate number and a #252 draft gear box. Also, the lid on the #252 snaps on the box to keep the assembly securely together.

Examples:

• If you need a #31 coupler use a #141 Whisker Coupler with the #252 Gearbox.
• If you need a #32 coupler use a #142 Whisker Coupler with the #252 Gearbox.
• If you need a #33 coupler use a #143 Whisker Coupler with the #252 Gearbox.
• If you need a #34 coupler use a #144 Whisker Coupler with the #252 Gearbox.
• If you need a #35 coupler use a #145 Whisker Coupler with the #252 Gearbox.
• If you need a #36 coupler use a #146 Whisker Coupler with the #252 Gearbox.
• If you need a #37 coupler use a #147 Whisker Coupler with the #252 Gearbox.
• If you need a #38 coupler use a #148 Whisker Coupler with the #252 Gearbox.
• If you need a #39 coupler use a #149 Whisker Coupler with the #252 Gearbox.

2-56 screws are the most commonly used for center hole. Screw length will vary depending on the mounting situation.

Package Includes:

(10) Pair #252 HO Scale Small Snap-Together Gearboxes & lids

#252 Plastic Draft Small Gearboxes & Lids Features:

• Material – Insulated Plastic
• Dimensions – 3/8″L x 5/16″W x 9/64″H
• Works With – All Whisker Couplers

Whisker Coupler in a #252 Gearbox on top. Mounting Specifications:

• Mounting Height – See 30-Series Coupler you are trying to duplicate.
• Centerline – 25/64″
• Trip Pin Height – 1/32″
• Center Hole – 2-56 Insulated Screws are the most commonly used. (Screw length will vary)

Whisker Coupler in a #252 Gearbox on bottom. Mounting Specifications:

• Mounting Height – See 30-Series Coupler you are trying to duplicate.
• Centerline – 25/64″
• Trip Pin Height – 1/32″
• Center Hole – 2-56 Insulated Screws are the most commonly used. (Screw length will vary)