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CC-1S03245 -BK-DS-BK1312 rev A Size datasheet - BK1312
ISO 3245 BK1312 drawn cup needle roller
bearing
Size datasheet: this bearing's values with their levels, conventions and sources.
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BK1312, front view, 1.5:1 BK1312, view from above, 1:1 Sym. Dimension Fw Diameter under the rollers D Outside diameter c Width Ct Clear depth to the closed end r Chamfer dimension r_s min
For 13 mm shafts running directly on the rollers, closing a housing bore
Part key iso3245-bk1312
Files 1 STEP AP214 (simplified), cup and rollers
Value Level 13 La - 3 19 La - 3 12 La - 3 2 9.30 1-2 2 0.8 1-2
Modeled value: nominal, else the midpoint of min-max. =: only that limit is given. * amber: one source (LO). c: a source value was corrected. Level
- independent sources.
ISO 3245 (edition not printed by the sources) Drawn cup needle roller bearing - BK1312 - Dimensions in mm - CC-BY 4.0, lronPixel Labs LLC
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.
Page 1/2 spec c964ffabe3a887708eb3e6e0cal8e3b2147b3b9c
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. CC-1$03245-BK-DS-BK1312 rev A 0 CommunityCAD Size datasheet - BK1312
Conventions
¢ Cup (illustrative): Wall s = (D - Fw)/6 thick; each open end's lip turned in to Fw + 2s, s thick. Not any maker's design.
« Needle rollers (illustrative): No cage. Diameter Dw = (D - Fw)/2 - s onthe circle Fw + Dw, length Ct - 3s, from Z = 2s, as many as fit at a pitch of 1.25 Dw, each a separate solid. Not any maker's design; measured only for fit.
« Closed end: A flat plate from the clear depth Ct (its minimum) to the width C, no dimple; its outside corner a quarter-round of r_s min.
« Corners: Outside corners are quarter-rounds of r_s min, the smallest any maker states; the shape isn't specified. Lip edges are sharp.
« Values: Fw, D and C at their nominals; Ct at its minimum; r at r_s min, the only limit the sources give.
« Markings and grades: No markings. Tolerances, radial clearance and lubricant are not geometry: one model per bearing.
Sources
Source Publisher Retrieved sha256
schaeffler-hri-bk Schaeffler (INA) 2026-10-29 9e4e2e13d41b (kept outside the repo) koyo-bs007-bk JTEKT (Koyo) 2026-10-29 183fdf7204d6 (kept outside the repo) ntn-bearingfinder-bk NTN Americas 2026-10-29 ae79a07c9bd5
The whole series (verification map, corrections, drawings): CC-ISO3245 -BK-DS.
ISO 3245 (edition not printed by the sources) Page 2/2 Drawn cup needle roller bearing - BK1312 - Dimensions in mm - CC-BY 4.0, lronPixel Labs LLC spec c964ffabe3a887708eb3e6e0cal8e3b2147b3b9c
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.