B-Line Eaton series runway splice, Runway horizontal reducing butt splice kit, ASTM A570 structural steel, Black zinc

The SB2102A2BZ is a horizontal reducing butt splice kit for cable runway. It joins two straight runs end to end in the same horizontal plane where the runway changes size, so the splice carries the transition rather than butting mismatched stringers together. It is a kit, so the splice plates and the fastening hardware come together as one part number.

No. This is a horizontal butt splice, meaning it joins two runs in line and in the same plane. For a direction change or a level change you need the corresponding corner, elbow, or vertical transition hardware from the B-Line runway splice range, not this kit.

ASTM A570 structural steel with a black zinc finish. A570 is a hot-rolled carbon structural steel, so the splice is a load-carrying part, not sheet trim. The black zinc finish is B-Line's standard black runway finish, so it reads the same as black-finished B-Line runway sections in the same room.

The kit measures 5 x 2.1875 x 2 inches and weighs 1.13 lb. Small enough that a tech can carry a handful up a ladder, but check the 2 inch height against your stringer depth and against any clearance you need where the runway passes over a rack or under a cable tray.

Order by manufacturer part number SB2102A2BZ, Eaton B-Line series runway splice. The BZ suffix is the black zinc finish. One part number covers the complete kit, so there is no separate hardware line to add.

Use a reducing splice like the SB2102A2BZ only where the two runway sections are different sizes and you need the joint to step between them. If both sections are the same size, a straight butt splice is the correct part and a reducer will leave you fighting the alignment.