A 1-1/4″ dual output plug-in output shaft for flexible-mount right-angle speed reducers. It converts the reducer's hollow output bore to a male keyed stub. 10.51″ overall with a 1/4″ square keyseat and a 1/2-13 end retention tap on each end. Crosses McMaster 6771K61. Load it as a configurable starting point. Material, tolerances, and features stay editable, and we confirm full geometry against your reducer or old shaft before we cut.
Material, tolerances, and features (keyseat size, end retention tap, extra flats or grooves) stay editable in the configurator. The shaft diameter, overall length, keyed-output length, and tap thread are taken from the published catalog data; the keyway dimensions and exact tap depth are standard-derived and confirmed against your reducer or your old shaft before we cut, the drawing's title block stamps the source SKU so any deviation is visible to your buyer and to us.
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.
