Stromberg Carlson SMFP Manual RV Entry Step Dimensions & Parts Guide

Replacing a folding RV entry step? The Stromberg Carlson SMFP series, manufactured by Flexco, includes single, double, triple and four-step steel assemblies. Choose by the number of steps, model width, rise and mounting-hole pattern, not by step count alone. All nine current models share a manufacturer-rated 300 lb capacity.

Original manufacturer dimensions

The Stromberg Carlson manual-step model guide lists all nine SMFP versions, while the 2026 manufacturer catalog (PDF, printed page 18) supplies the mounting-hole chart and dimension drawings. Use the drawing to identify the X and Y mounting-hole directions before comparing measurements on your RV.

SMFP model and mounting-hole comparison

Model Steps Width* Rise Mount X Mount Y
SMFP-1100 1 24 in 7½ in 23¼ in 4½ in
SMFP-1120 1 20 in 7½ in 19 5/16 in 4½ in
SMFP-1200 1 24 in 2¾ in 26½ in 12½ in
SMFP-1220 1 20 in 2¾ in 22½ in 12½ in
SMFP-2100 2 24 in 8 in 24⅝ in 7 in
SMFP-2120 2 20 in 8 in 20⅝ in 7 in
SMFP-3100 3 24 in 8 in 25½ in 5½ / 7 in
SMFP-3200L 3 24 in 9½ in 25⅜ in 5½ / 7 in
SMFP-4400 4 24 in 8 in 25⅜ in 5½ / 7 in

*Width is the manufacturer's nominal step-model width, not necessarily the overall outside bracket width. X and Y are the labeled hole dimensions from its factory mounting drawing. Measure the installed frame opening and bracket clearance separately.

Single steps, low-profile models and taller entry systems

Single or low-profile

SMFP-1100/1120 use a 7½-inch rise; SMFP-1200/1220 have a shallow 2¾-inch rise. The low-profile units also have a different mounting-hole layout. Choose by clearance, not simply 20-inch versus 24-inch model width.

Two, three or four steps

SMFP-2100/2120 are 8-inch-rise double steps. SMFP-3100 is a three-step with an 8-inch rise, while the longer-rise SMFP-3200L is 9½ inches. SMFP-4400 is the four-step 8-inch-rise model.

Find the exact SMFP model in the catalog

Before ordering replacement steps

With the old assembly safely supported, measure the step-well opening, mounting-hole centres and available clearance underneath the coach. Check how far the folded unit extends below the frame, and whether a taller unit can deploy without hitting tires, plumbing or the ground. Verify structural mounting points and any required manufacturer-approved adapters rather than drilling new holes into an unsupported surface.

A model with the same tread width or number of steps is not automatically a bolt-on replacement. If the original has a different rise, bracket offset or folded depth, compare the complete manufacturer's dimension drawing before purchasing.

For a separate aluminum scissor-step system, compare the Torklift GlowStep Original step guide. Browse RV entry steps to see other assemblies.

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