# NEMA 8, 11, 14, 23 and 34 stepper motors > What is the NEMA 23 mounting hole pattern? - Category: Hardware › Motion - Kind: Hardware - Basis: NEMA ICS 16 frame sizes; shaft and boss dimensions as commonly supplied (check the specific motor's drawing for body length) - Page: https://xemstudio.com/objects/nema-steppers-8-to-34/ · JSON: https://xemstudio.com/api/geometry?object=nema-steppers-8-to-34 · Plain text: https://xemstudio.com/objects/nema-steppers-8-to-34/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses ## Notes - The NEMA number is the face width in tenths of an inch: NEMA 17 = 1.7 in = 42.3 mm. The face and hole pattern are fixed; body length varies with torque. - NEMA 23: 56.4 mm face, 47.14 mm (1.856 in) hole pattern, Ø5.1 holes (#10-32 or M5), Ø38.1 boss, Ø6.35 shaft. NEMA 34: 86 mm face, 69.6 mm pattern, Ø14 shaft. - NEMA 14: 35.2 face, 26 mm pattern, M3; NEMA 11: 28.2 face, 23 mm pattern, M2.5; NEMA 8: 20.2 face, 16 mm pattern, M2, Ø4 shaft. ## Sizes | nema | face_mm | hole_pattern_mm | hole_dia_mm | boss_dia_mm | shaft_dia_mm | shaft_len_mm | common_body_mm | |---|---|---|---|---|---|---|---| | 8 | 20.2 | 16.0 | 2.2 | 15.0 | 1.5 | 4.0 | 10 | 30, 38 | | 11 | 28.2 | 23.0 | 2.6 | 22.0 | 2.0 | 5.0 | 20 | 32, 45 | | 14 | 35.2 | 26.0 | 3.0 | 22.0 | 2.0 | 5.0 | 20 | 28, 36 | | 17 | 42.3 | 31.0 | 3.0 | 22.0 | 2.0 | 5.0 | 22 | 34, 40, 48 | | 23 | 56.4 | 47.14 | 5.1 | 38.1 | 1.6 | 6.35 | 21 | 56, 76 | | 34 | 86.0 | 69.6 | 6.5 | 73.0 | 1.6 | 14.0 | 37 | 80, 115 | ## Where the files are - Wikipedia: [Stepper motor](https://en.wikipedia.org/wiki/Stepper_motor) — web — CC BY-SA 4.0 (text) - NEMA: [ICS 16 motion/position control motors and controls](https://www.nema.org/standards/view/motion-position-control-motors-controls-and-feedback-devices) — PDF — NEMA standard, purchase ## Free STEP/STL (10 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/nema-steppers-8-to-34/index.json - nema8-30: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-30.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-30.stl) — NEMA 8 envelope, 30 mm body, 16.0 mm hole pattern, Ø4.0 shaft - nema8-38: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-38.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-38.stl) — NEMA 8 envelope, 38 mm body, 16.0 mm hole pattern, Ø4.0 shaft - nema11-32: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-32.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-32.stl) — NEMA 11 envelope, 32 mm body, 23.0 mm hole pattern, Ø5.0 shaft - nema11-45: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-45.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-45.stl) — NEMA 11 envelope, 45 mm body, 23.0 mm hole pattern, Ø5.0 shaft - nema14-28: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-28.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-28.stl) — NEMA 14 envelope, 28 mm body, 26.0 mm hole pattern, Ø5.0 shaft - nema14-36: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-36.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-36.stl) — NEMA 14 envelope, 36 mm body, 26.0 mm hole pattern, Ø5.0 shaft - nema23-56: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.stl) — NEMA 23 envelope, 56 mm body, 47.14 mm hole pattern, Ø6.35 shaft - nema23-76: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-76.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-76.stl) — NEMA 23 envelope, 76 mm body, 47.14 mm hole pattern, Ø6.35 shaft - nema34-80: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-80.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-80.stl) — NEMA 34 envelope, 80 mm body, 69.6 mm hole pattern, Ø14.0 shaft - nema34-115: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-115.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-115.stl) — NEMA 34 envelope, 115 mm body, 69.6 mm hole pattern, Ø14.0 shaft ## Questions **What is the NEMA 23 bolt pattern?** Four holes on a 47.14 mm (1.856 in) square, Ø5.1 mm, on a 56.4 mm face; Ø38.1 mm pilot boss; Ø6.35 mm (1/4 in) shaft. **What is the NEMA 14 hole pattern?** 26 mm square, M3, on a 35.2 mm face; Ø22 boss; Ø5 shaft. **NEMA 17 vs NEMA 23 size?** 42.3 mm vs 56.4 mm face; 31 vs 47.14 mm hole pattern; 5 vs 6.35 mm shaft. Mounts are not interchangeable. **What is the NEMA 34 shaft size?** 14 mm (some 12.7 mm / 1/2 in); 86 mm face, 69.6 mm hole pattern, Ø73 mm boss. ## Fits with - [NEMA 17 stepper motor](https://xemstudio.com/objects/nema-17-stepper/) - [Flexible shaft couplers, 5–10 mm bores](https://xemstudio.com/objects/shaft-couplers/) - [GT2 timing pulleys, 16T–60T (2 mm pitch)](https://xemstudio.com/objects/gt2-pulleys/) - [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/) - [Ball bearings, 683 to 6210 and flanged F6xx (ISO 15)](https://xemstudio.com/objects/ball-bearings-metric/)