Limits and Fits Background to BS Selected Fits SELECTED FITS NEGATIVE Limits and Fits
Background to BS Selected Fits SELECTED FITS Limits and Fits Classification H11-c11 Extra loose running fit Provides a large clearance. Gives easy assembly.
H9-d10 Loose running fit Used where ease of assembly is required (e.g. pulleys) H9-e9 Easy running fit Suitable for smaller parts, e.g. camshafts etc. H8-f7 Normal running fit Good quality fit which can be easily produced.
H7-g6 Close running or Location fit Expensive to produce. H7-h6 Precision slide or Location fit Precision Slides with good lubrication under constant Temp. Limits and Fits Classification
H7-k6 Push or easy keyring fit Location of parts which are not dismantled often. H7-n6 Tight keyring fit Tight assembly of long parts where H7-k6 isnt sufficient.
H7-p6 Light drive fit Used to secure steel parts. Dismantel & renewal required. H7-s6 Heavy drive fit Permanent assembly of ferrous parts. Shrunk-fit required. Limits and Fits - Question
Consider a Drive pulley and shaft assembly (shaft = 40). The keyway provides positive drive rotation. The required fit is H7-h6. Calculate: the Maximum and Minimum Limits for the size of Hole & Shaft. Limits and Fits - Solution 40 H7 =
+25 upper 0 lower I.E.: Max Limit of Size of Hole: 40 + .025 = 40.025 Min Limit of Size of Hole: 40 0 = 40.000 40 h6 = -16 upper 0 lower
I.E.: Max Limit of Size of Shaft: 40 - .016 = 39.984 Min Limit of Size of Shaft: 40 0 = 40.000 Limits and Fits - AutoCAD Machining and Surface Texture 3.2 Surface Roughness of 3.2 m
(Machining Optional) 3.2 Machining of Surface is Required Machining of Surface (removal of material) is Prohibited!
Machining and Surface Texture All surfaces are to be machined. A value can be added as necessary. Typical Drawing with Surface Roughness
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