Airtac LSH Linear Guide Rail LSH20HN2X1840S20CN-M6

This listing is the complete guide: one hardened 1840 mm LSH20 profile rail, drilled for top-lock mounting with the S20 end-hole offset, carrying two HN square carriages of standard length. For size 20 the code matches the true rail width of 20 mm, so shoulders can be laid out straight from the drawing (H 4.3 mm, corner radius R max 0.5 mm). Inside each carriage, four rows of recirculating balls run in X-shaped arc raceways at a 45 degree contact angle, two contact points per ball, giving equal capacity in every direction and enough self-alignment to absorb slight mounting-surface error - within the limits for this size and preload, not beyond them.

Rated per standard carriage at 18.6 kN dynamic (C) and 28.6 kN static (C0), with allowable moments of MR 0.27, MP 0.25 and My 0.25 kN.m; the two carriages share the vertical duty and resist tipping along the 1840 mm travel. The C code is medium preload, the rigidity premium of this SKU: at 500 mm rail spacing it cuts the allowable height error from 130 um to 50 um, so faces must be machined, shimmed and torqued to a tighter standard than a preload-A set of the same size. Accuracy grade is N (normal), running parallelism 12-37 um across the catalogue length bands.