Description #5 (NO.5®) Metal Couplers – Medium Centerset his industry leading coupler features an all metal standard coupler, and #634 standard centering spring and comes complete with and insulated draft gearbox and lid. The NO.5® Magne-Matic® Metal Coupler may be mounted with the included #232 Gearbox or with other manufacturers cast-on coupler pockets. The 148 Whisker® Coupler is equivalent to the NO.5® Metal Coupler. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. Use the provided insulated gearbox or insulated #28 coupler. Refer to our helpful Coupler Conversion Charts to determine the appropriate coupler to use on your model. NO.5® Standard Coupler Instructions Two pair per package Bulk Packs of #5 (NO.5®) Metal Couplers without gearboxes Package Includes: (2) Pair NO.5® Metal Couplers – Medium Centerset Shank (2) Pair #634 Centering Spring NO.5® Style (2) Pair #232 Gearboxes (2) #622 Knuckle Springs   NO.5® Metal Coupler Features: Material  –   Metal Shank Length  –   Medium (9/32″) (center hole to back of coupler head) Coupler Offset  –   Centerset Knuckle Spring  –   #622 Centering System  –   Standard Shank Centering Spring  –   #634 Centering Spring NO.5® Style Head  –   Standard Head Works In Place of  –   #58, #28, #118, #119, #148, #158, most medium centerset “clone” couplers Works With  –   #213, #232, #234, #242, most manufacturer cast-on draft gearboxes   #232 Plastic Draft Gearboxes & Lids Features: Material  –   Insulated Plastic Dimensions  –   29/64″L x 19/64″W x 7/64″H Works With  –   NO.5®, #58, 20-Series and all Whisker® Couplers   Mounting Specifications: Mounting Height  –   29/64″ Centerline  –   25/64″ Trip Pin Height  –   1/32″ Center Hole  –   2-56 Insulated Screws are the most commonly used. (Screw length will vary) Side Holes  –   0-48 Self-Tapping or 0-80 Machine Screws. (Screw length will vary)