Replacement plug-in output shafts for flexible-mount right-angle speed reducers.
These convert a right-angle reducer's female (hollow) output bore into a male keyed output stub. Pick a size below to load it into the configurator, the shaft diameter, keyed-output length, ANSI B17.1 keyseat, and end retention tap are pre-dimensioned, and single-output and dual-output (keyed both ends) styles are offered. You stay in control of material (1045 default, 1144 stress-proof or alloy for higher strength), surface finish, tolerance class, and any added features. Each ships with a length of key stock. The drawing's title block stamps the source SKU, and we confirm full machining geometry against your reducer or your old shaft before cutting.
Plug-in shaft sizes
Replacement plug-in output shafts for flexible-mount right-angle speed reducers. They convert a reducer's female output bore to a male keyed stub. Single-output (3 keyseats) and dual-output (4 keyseats; keyed both ends), 3/4″ through 1-3/8″, with the two central reducer-drive keyseats, the keyed output(s), axial retention tap(s), and retaining-ring grooves pre-dimensioned (ANSI B17.1 keys). Diameter, overall length, output length, and tap thread are published per size; click a card to load a configurable starting point. Crosses the McMaster 6771K plug-in shaft series.
It converts a flexible-mount right-angle reducer's female (hollow) output bore into a male, keyed output stub so you can drive a sprocket, pulley, or coupling. The reducer turns the shaft through two central keyseats in its bore; the shaft then delivers torque at a keyed output end, one (single output) or both (dual output). So a single-output shaft has 3 keyseats (2 central drive + 1 output) and a dual-output has 4 (2 drive + 2 output), plus an axial retention tap at each output end and two retaining-ring grooves that hold the shaft in the reducer. Each loads into the configurator with all of that pre-placed and ships with a length of key stock.
Match the shaft diameter to your reducer's output bore and choose single or dual output. The diameter then fixes the keyway size (ANSI B17.1 square key) and the retention-tap thread. If you're replacing a catalog part, the cards cross-reference the McMaster 6771K SKUs. Pick the card whose diameter, length, and output count match.
All keyways are a standard ANSI B17.1 square keyseat sized to the shaft diameter (3/16″ up to 7/8″, 1/4″ through 1-1/4″, 5/16″ at 1-3/8″). There are two central keyways where the reducer drives the shaft, plus one at each keyed output end (single = 3 keyseats, dual = 4). Each output end also carries a UNC retention tap (1/4-20, 3/8-16, or 1/2-13 by size) for a washer-and-bolt that holds the driven component on. Every dimension stays editable in the configurator.
The cards default to 1045 medium-carbon steel, a good general-duty reducer-shaft material. For higher strength switch to 1144 stress-proof or an alloy in the configurator. Material certs (MTRs) are available on request.
The shaft diameter, overall length, keyed-output length, and retention-tap thread are taken from the published catalog data; the full feature structure, the two central reducer-drive keyseats, the output keyseat(s), and the two retaining-ring grooves, is confirmed against the McMaster CAD drawings (6771K439 single, 6771K441 dual). The exact keyway lengths, ring-groove dimensions, the small drive-zone turn-down, and the feature positions for sizes other than 1-3/8″ are standard-derived/scaled and confirmed against your reducer or your old shaft before we cut. The drawing title block stamps the source SKU so any deviation is visible to you and to us.
These cover the common 3/4″ through 1-3/8″ flexible-mount right-angle reducer shafts in single and dual output. For another diameter, length, or a different keyway, load the closest card and edit it, or send us a print or the old shaft and we'll match it.
