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Involute splines ANSI B92.1 (30° flat root, side fit): pitch, major and minor diameters by tooth count, 5/10 to 48/96 + example shaft STEP/STL
What are the pitch, major and minor diameters of an ANSI B92.1 involute spline (for example 16/32 pitch, 24 teeth)? · Standard part · basis: ANSI B92.1 30° flat-root side-fit formulas as published by Engineers Edge, pitch series and tooth range from Machinery's Handbook Table 3; basic dimensions, no tolerance; true involute shaft sections drawn from them
Also called: ansi b92.1, involute spline dimensions, spline major diameter formula, spline minor diameter, 16/32 spline 24 teeth, 12/24 spline pitch diameter, spline pitch diameter = n/p, 30 degree flat root spline, involute spline table, spline shaft step file, spline shaft stl, 24/48 spline, 20/40 spline, ansi b92.1 flat root side fit, involute spline calculator, spline dp pitch
Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features
- sizes
- 88 in table
Notes
- ANSI B92.1 involute splines are named by two diametral pitches, P / Ps (for example 16/32): P sets the pitch diameter D = N / P and the tooth thickness, Ps = 2 P (the 'stub' pitch) sets the shallow tooth height. This page is the 30° pressure angle, flat-root, side-fit form. Formulas (Engineers Edge's copy of the ANSI B92.1-1970, R1993 table): D = N / P; base Ø = D cos 30°; circular pitch π / P; minimum effective space width π / (2 P); major Ø external Do = (N + 1) / P; minor Ø internal Di = (N − 1) / P; minor Ø external Dre = (N − 1.35) / P for 2.5/5 to 12/24 pitch and (N − 1.2) / P for 16/32 and finer; major Ø internal Dri = (N + 1.35) / P; form diameters DFi = (N + 1) / P + 2 cF and DFe = (N − 1) / P − 2 cF with form clearance cF = 0.001 D (max 0.010, min 0.002 in).
- Machinery's Handbook Table 3 (ANSI B92.1-1996) lists the pitch series 2.5/5, 3/6, 4/8, 5/10, 6/12, 8/16, 10/20, 12/24, 16/32, 20/40, 24/48, 32/64, 40/80, 48/96, 64/128, 80/160, 128/256, tooth numbers 6 to 60 at 30° and 37.5° (6 to 100 at 45°), and says odd tooth counts have no advantage. The table here covers pitches 5/10 to 48/96 and eight common tooth counts; any other N follows from the formulas. Dri for 16/32 and finer is left blank: the one formula table read prints a single Dri = (N + 1.35) / P line while it splits Dre by pitch, and the second line for fine pitches could not be confirmed, so it is not guessed. Fillet-root (30°, 37.5°, 45°) and major-diameter-fit forms are not tabulated.
- Tolerances: ANSI B92.1 gives classes 4, 5, 6 and 7 (class 5 is the base; class 4 is 0.71 times, 6 is 1.40 times, 7 is 2.00 times its tolerance), actual tooth thickness and space width are offset from the basic values for fit, and an internal spline is cut to the effective space width. All values in the table are basic (nominal) dimensions before those allowances; apply your process's clearance on mating parts only.
- Files: 14 example external spline shaft sections (pitch and tooth count in the file name), 1 in long, as one extruded solid with the basic tooth: pitch diameter D, major diameter Do and minor diameter Dre from the table, true involute flanks at 30° with tooth thickness half the circular pitch. The 1 in length is an example. Where the standard has a root fillet below the form diameter, the file carries the involute flank straight down to the root circle (a simplification; the contact region is exact). No internal splines are drawn because the internal root and form details beyond the table were not read.
- Maker CAD: spline shafts and hubs are sold by Misumi-type and inch-pitch suppliers per part; the standard itself (ANSI B92.1-1996) is sold by ANSI / SAE and is linked, not reproduced.
Involute splines ANSI B92.1 (30° flat root, side fit): pitch, major… size chart
| pitch P / Ps | teeth N | pitch Ø D = N / P, in (mm) | major Ø external Do = (N + 1) / P | minor Ø external Dre | minor Ø internal Di = (N − 1) / P | major Ø internal Dri |
|---|---|---|---|---|---|---|
| 5/10 | 10 | 2 (50.80) | 2.2 (55.88) | 1.73 (43.94) | 1.8 (45.72) | 2.27 (57.66) |
| 5/10 | 12 | 2.4 (60.96) | 2.6 (66.04) | 2.13 (54.10) | 2.2 (55.88) | 2.67 (67.82) |
| 5/10 | 16 | 3.2 (81.28) | 3.4 (86.36) | 2.93 (74.42) | 3 (76.20) | 3.47 (88.14) |
| 5/10 | 20 | 4 (101.60) | 4.2 (106.68) | 3.73 (94.74) | 3.8 (96.52) | 4.27 (108.46) |
| 5/10 | 24 | 4.8 (121.92) | 5 (127.00) | 4.53 (115.06) | 4.6 (116.84) | 5.07 (128.78) |
| 5/10 | 30 | 6 (152.40) | 6.2 (157.48) | 5.73 (145.54) | 5.8 (147.32) | 6.27 (159.26) |
| 5/10 | 36 | 7.2 (182.88) | 7.4 (187.96) | 6.93 (176.02) | 7 (177.80) | 7.47 (189.74) |
| 5/10 | 48 | 9.6 (243.84) | 9.8 (248.92) | 9.33 (236.98) | 9.4 (238.76) | 9.87 (250.70) |
| 6/12 | 10 | 1.6667 (42.33) | 1.8333 (46.57) | 1.4417 (36.62) | 1.5 (38.10) | 1.8917 (48.05) |
| 6/12 | 12 | 2 (50.80) | 2.1667 (55.03) | 1.775 (45.09) | 1.8333 (46.57) | 2.225 (56.52) |
| 6/12 | 16 | 2.6667 (67.73) | 2.8333 (71.97) | 2.4417 (62.02) | 2.5 (63.50) | 2.8917 (73.45) |
| 6/12 | 20 | 3.3333 (84.67) | 3.5 (88.90) | 3.1083 (78.95) | 3.1667 (80.43) | 3.5583 (90.38) |
| 6/12 | 24 | 4 (101.60) | 4.1667 (105.83) | 3.775 (95.88) | 3.8333 (97.37) | 4.225 (107.32) |
| 6/12 | 30 | 5 (127.00) | 5.1667 (131.23) | 4.775 (121.28) | 4.8333 (122.77) | 5.225 (132.72) |
| 6/12 | 36 | 6 (152.40) | 6.1667 (156.63) | 5.775 (146.68) | 5.8333 (148.17) | 6.225 (158.12) |
| 6/12 | 48 | 8 (203.20) | 8.1667 (207.43) | 7.775 (197.48) | 7.8333 (198.97) | 8.225 (208.91) |
| 8/16 | 10 | 1.25 (31.75) | 1.375 (34.92) | 1.0813 (27.46) | 1.125 (28.57) | 1.4187 (36.04) |
| 8/16 | 12 | 1.5 (38.10) | 1.625 (41.27) | 1.3313 (33.81) | 1.375 (34.92) | 1.6687 (42.39) |
| 8/16 | 16 | 2 (50.80) | 2.125 (53.97) | 1.8313 (46.51) | 1.875 (47.62) | 2.1688 (55.09) |
| 8/16 | 20 | 2.5 (63.50) | 2.625 (66.67) | 2.3312 (59.21) | 2.375 (60.32) | 2.6688 (67.79) |
| 8/16 | 24 | 3 (76.20) | 3.125 (79.38) | 2.8312 (71.91) | 2.875 (73.02) | 3.1688 (80.49) |
| 8/16 | 30 | 3.75 (95.25) | 3.875 (98.42) | 3.5812 (90.96) | 3.625 (92.07) | 3.9188 (99.54) |
| 8/16 | 36 | 4.5 (114.30) | 4.625 (117.47) | 4.3312 (110.01) | 4.375 (111.12) | 4.6688 (118.59) |
| 8/16 | 48 | 6 (152.40) | 6.125 (155.57) | 5.8312 (148.11) | 5.875 (149.22) | 6.1688 (156.69) |
| 10/20 | 10 | 1 (25.40) | 1.1 (27.94) | 0.865 (21.97) | 0.9 (22.86) | 1.135 (28.83) |
| 10/20 | 12 | 1.2 (30.48) | 1.3 (33.02) | 1.065 (27.05) | 1.1 (27.94) | 1.335 (33.91) |
| 10/20 | 16 | 1.6 (40.64) | 1.7 (43.18) | 1.465 (37.21) | 1.5 (38.10) | 1.735 (44.07) |
| 10/20 | 20 | 2 (50.80) | 2.1 (53.34) | 1.865 (47.37) | 1.9 (48.26) | 2.135 (54.23) |
| 10/20 | 24 | 2.4 (60.96) | 2.5 (63.50) | 2.265 (57.53) | 2.3 (58.42) | 2.535 (64.39) |
| 10/20 | 30 | 3 (76.20) | 3.1 (78.74) | 2.865 (72.77) | 2.9 (73.66) | 3.135 (79.63) |
| 10/20 | 36 | 3.6 (91.44) | 3.7 (93.98) | 3.465 (88.01) | 3.5 (88.90) | 3.735 (94.87) |
| 10/20 | 48 | 4.8 (121.92) | 4.9 (124.46) | 4.665 (118.49) | 4.7 (119.38) | 4.935 (125.35) |
| 12/24 | 10 | 0.8333 (21.17) | 0.9167 (23.28) | 0.7208 (18.31) | 0.75 (19.05) | 0.9458 (24.02) |
| 12/24 | 12 | 1 (25.40) | 1.0833 (27.52) | 0.8875 (22.54) | 0.9167 (23.28) | 1.1125 (28.26) |
| 12/24 | 16 | 1.3333 (33.87) | 1.4167 (35.98) | 1.2208 (31.01) | 1.25 (31.75) | 1.4458 (36.72) |
| 12/24 | 20 | 1.6667 (42.33) | 1.75 (44.45) | 1.5542 (39.48) | 1.5833 (40.22) | 1.7792 (45.19) |
| 12/24 | 24 | 2 (50.80) | 2.0833 (52.92) | 1.8875 (47.94) | 1.9167 (48.68) | 2.1125 (53.66) |
| 12/24 | 30 | 2.5 (63.50) | 2.5833 (65.62) | 2.3875 (60.64) | 2.4167 (61.38) | 2.6125 (66.36) |
| 12/24 | 36 | 3 (76.20) | 3.0833 (78.32) | 2.8875 (73.34) | 2.9167 (74.08) | 3.1125 (79.06) |
| 12/24 | 48 | 4 (101.60) | 4.0833 (103.72) | 3.8875 (98.74) | 3.9167 (99.48) | 4.1125 (104.46) |
| 16/32 | 10 | 0.625 (15.88) | 0.6875 (17.46) | 0.55 (13.97) | 0.5625 (14.29) | not read (see note) |
| 16/32 | 12 | 0.75 (19.05) | 0.8125 (20.64) | 0.675 (17.14) | 0.6875 (17.46) | not read (see note) |
| 16/32 | 16 | 1 (25.40) | 1.0625 (26.99) | 0.925 (23.50) | 0.9375 (23.81) | not read (see note) |
| 16/32 | 20 | 1.25 (31.75) | 1.3125 (33.34) | 1.175 (29.84) | 1.1875 (30.16) | not read (see note) |
| 16/32 | 24 | 1.5 (38.10) | 1.5625 (39.69) | 1.425 (36.20) | 1.4375 (36.51) | not read (see note) |
| 16/32 | 30 | 1.875 (47.62) | 1.9375 (49.21) | 1.8 (45.72) | 1.8125 (46.04) | not read (see note) |
| 16/32 | 36 | 2.25 (57.15) | 2.3125 (58.74) | 2.175 (55.24) | 2.1875 (55.56) | not read (see note) |
| 16/32 | 48 | 3 (76.20) | 3.0625 (77.79) | 2.925 (74.29) | 2.9375 (74.61) | not read (see note) |
| 20/40 | 10 | 0.5 (12.70) | 0.55 (13.97) | 0.44 (11.18) | 0.45 (11.43) | not read (see note) |
| 20/40 | 12 | 0.6 (15.24) | 0.65 (16.51) | 0.54 (13.72) | 0.55 (13.97) | not read (see note) |
| 20/40 | 16 | 0.8 (20.32) | 0.85 (21.59) | 0.74 (18.80) | 0.75 (19.05) | not read (see note) |
| 20/40 | 20 | 1 (25.40) | 1.05 (26.67) | 0.94 (23.88) | 0.95 (24.13) | not read (see note) |
| 20/40 | 24 | 1.2 (30.48) | 1.25 (31.75) | 1.14 (28.96) | 1.15 (29.21) | not read (see note) |
| 20/40 | 30 | 1.5 (38.10) | 1.55 (39.37) | 1.44 (36.58) | 1.45 (36.83) | not read (see note) |
| 20/40 | 36 | 1.8 (45.72) | 1.85 (46.99) | 1.74 (44.20) | 1.75 (44.45) | not read (see note) |
| 20/40 | 48 | 2.4 (60.96) | 2.45 (62.23) | 2.34 (59.44) | 2.35 (59.69) | not read (see note) |
| 24/48 | 10 | 0.4167 (10.58) | 0.4583 (11.64) | 0.3667 (9.31) | 0.375 (9.52) | not read (see note) |
| 24/48 | 12 | 0.5 (12.70) | 0.5417 (13.76) | 0.45 (11.43) | 0.4583 (11.64) | not read (see note) |
| 24/48 | 16 | 0.6667 (16.93) | 0.7083 (17.99) | 0.6167 (15.66) | 0.625 (15.88) | not read (see note) |
| 24/48 | 20 | 0.8333 (21.17) | 0.875 (22.22) | 0.7833 (19.90) | 0.7917 (20.11) | not read (see note) |
| 24/48 | 24 | 1 (25.40) | 1.0417 (26.46) | 0.95 (24.13) | 0.9583 (24.34) | not read (see note) |
| 24/48 | 30 | 1.25 (31.75) | 1.2917 (32.81) | 1.2 (30.48) | 1.2083 (30.69) | not read (see note) |
| 24/48 | 36 | 1.5 (38.10) | 1.5417 (39.16) | 1.45 (36.83) | 1.4583 (37.04) | not read (see note) |
| 24/48 | 48 | 2 (50.80) | 2.0417 (51.86) | 1.95 (49.53) | 1.9583 (49.74) | not read (see note) |
| 32/64 | 10 | 0.3125 (7.94) | 0.3438 (8.73) | 0.275 (6.99) | 0.2812 (7.14) | not read (see note) |
| 32/64 | 12 | 0.375 (9.52) | 0.4062 (10.32) | 0.3375 (8.57) | 0.3438 (8.73) | not read (see note) |
| 32/64 | 16 | 0.5 (12.70) | 0.5312 (13.49) | 0.4625 (11.75) | 0.4688 (11.91) | not read (see note) |
| 32/64 | 20 | 0.625 (15.88) | 0.6562 (16.67) | 0.5875 (14.92) | 0.5938 (15.08) | not read (see note) |
| 32/64 | 24 | 0.75 (19.05) | 0.7812 (19.84) | 0.7125 (18.10) | 0.7188 (18.26) | not read (see note) |
| 32/64 | 30 | 0.9375 (23.81) | 0.9688 (24.61) | 0.9 (22.86) | 0.9062 (23.02) | not read (see note) |
| 32/64 | 36 | 1.125 (28.57) | 1.1562 (29.37) | 1.0875 (27.62) | 1.0938 (27.78) | not read (see note) |
| 32/64 | 48 | 1.5 (38.10) | 1.5312 (38.89) | 1.4625 (37.15) | 1.4688 (37.31) | not read (see note) |
| 40/80 | 10 | 0.25 (6.35) | 0.275 (6.99) | 0.22 (5.59) | 0.225 (5.71) | not read (see note) |
| 40/80 | 12 | 0.3 (7.62) | 0.325 (8.25) | 0.27 (6.86) | 0.275 (6.99) | not read (see note) |
| 40/80 | 16 | 0.4 (10.16) | 0.425 (10.79) | 0.37 (9.40) | 0.375 (9.52) | not read (see note) |
| 40/80 | 20 | 0.5 (12.70) | 0.525 (13.33) | 0.47 (11.94) | 0.475 (12.06) | not read (see note) |
| 40/80 | 24 | 0.6 (15.24) | 0.625 (15.88) | 0.57 (14.48) | 0.575 (14.60) | not read (see note) |
| 40/80 | 30 | 0.75 (19.05) | 0.775 (19.68) | 0.72 (18.29) | 0.725 (18.41) | not read (see note) |
| 40/80 | 36 | 0.9 (22.86) | 0.925 (23.50) | 0.87 (22.10) | 0.875 (22.22) | not read (see note) |
| 40/80 | 48 | 1.2 (30.48) | 1.225 (31.12) | 1.17 (29.72) | 1.175 (29.84) | not read (see note) |
| 48/96 | 10 | 0.2083 (5.29) | 0.2292 (5.82) | 0.1833 (4.66) | 0.1875 (4.76) | not read (see note) |
| 48/96 | 12 | 0.25 (6.35) | 0.2708 (6.88) | 0.225 (5.71) | 0.2292 (5.82) | not read (see note) |
| 48/96 | 16 | 0.3333 (8.47) | 0.3542 (9.00) | 0.3083 (7.83) | 0.3125 (7.94) | not read (see note) |
| 48/96 | 20 | 0.4167 (10.58) | 0.4375 (11.11) | 0.3917 (9.95) | 0.3958 (10.05) | not read (see note) |
| 48/96 | 24 | 0.5 (12.70) | 0.5208 (13.23) | 0.475 (12.06) | 0.4792 (12.17) | not read (see note) |
| 48/96 | 30 | 0.625 (15.88) | 0.6458 (16.40) | 0.6 (15.24) | 0.6042 (15.35) | not read (see note) |
| 48/96 | 36 | 0.75 (19.05) | 0.7708 (19.58) | 0.725 (18.41) | 0.7292 (18.52) | not read (see note) |
| 48/96 | 48 | 1 (25.40) | 1.0208 (25.93) | 0.975 (24.76) | 0.9792 (24.87) | not read (see note) |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| external spline | Do = (N + 1) / P, Dre = (N − 1.35 or − 1.2) / P, D = N / P (see the table) | internal spline of the same P/Ps, N and 30° flat-root side fit (Di = (N − 1) / P, Dri = (N + 1.35) / P up to 12/24) | designed | spline-shaft* |
| tooth form | 30°, tooth thickness π / (2 P) on the pitch circle (basic) | internal spline effective space width π / (2 P) minimum | designed | spline-shaft* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Engineers Edge | Involute Spline (ANSI B92.1-1970, R1993), 30 deg flat root side fit: D = N/P, Do = (N+1)/P, Dre = (N-1.35)/P or (N-1.2)/P, Di = (N-1)/P, Dri = (N+1.35)/P | web | Publisher's page; dimensions are facts |
| Machinery's Handbook, 31st ed. (online edition) | Table 3: basic dimensions for involute splines ANSI B92.1-1996: pitch series 2.5/5 to 128/256, 6 to 60 teeth at 30 degrees | web | Publisher's page; dimensions are facts |
| ANSI / SAE | ANSI B92.1-1996 Involute splines and inspection (standard; sold, not reproduced) | standard | ANSI / SAE; dimensions are facts verify |
Free files
★ Free files 14 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| spline-shaft-ansi-b92-1-12-24-12t | ANSI B92.1 30° flat-root external spline shaft section, 12/24 pitch, 12 teeth: pitch Ø25.400 mm (1 in), major Ø27.517 mm (1.0833 in), minor (root) Ø22.543 mm (0.8875 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-12-24-20t | ANSI B92.1 30° flat-root external spline shaft section, 12/24 pitch, 20 teeth: pitch Ø42.333 mm (1.6667 in), major Ø44.450 mm (1.75 in), minor (root) Ø39.476 mm (1.5542 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-12-24-24t | ANSI B92.1 30° flat-root external spline shaft section, 12/24 pitch, 24 teeth: pitch Ø50.800 mm (2 in), major Ø52.917 mm (2.0833 in), minor (root) Ø47.942 mm (1.8875 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-16-32-16t | ANSI B92.1 30° flat-root external spline shaft section, 16/32 pitch, 16 teeth: pitch Ø25.400 mm (1 in), major Ø26.987 mm (1.0625 in), minor (root) Ø23.495 mm (0.925 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-16-32-24t | ANSI B92.1 30° flat-root external spline shaft section, 16/32 pitch, 24 teeth: pitch Ø38.100 mm (1.5 in), major Ø39.688 mm (1.5625 in), minor (root) Ø36.195 mm (1.425 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-16-32-30t | ANSI B92.1 30° flat-root external spline shaft section, 16/32 pitch, 30 teeth: pitch Ø47.625 mm (1.875 in), major Ø49.212 mm (1.9375 in), minor (root) Ø45.720 mm (1.8 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-24-48-20t | ANSI B92.1 30° flat-root external spline shaft section, 24/48 pitch, 20 teeth: pitch Ø21.167 mm (0.8333 in), major Ø22.225 mm (0.875 in), minor (root) Ø19.897 mm (0.7833 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-24-48-30t | ANSI B92.1 30° flat-root external spline shaft section, 24/48 pitch, 30 teeth: pitch Ø31.750 mm (1.25 in), major Ø32.808 mm (1.2917 in), minor (root) Ø30.480 mm (1.2 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-32-64-30t | ANSI B92.1 30° flat-root external spline shaft section, 32/64 pitch, 30 teeth: pitch Ø23.812 mm (0.9375 in), major Ø24.606 mm (0.9688 in), minor (root) Ø22.860 mm (0.9 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-8-16-16t | ANSI B92.1 30° flat-root external spline shaft section, 8/16 pitch, 16 teeth: pitch Ø50.800 mm (2 in), major Ø53.975 mm (2.125 in), minor (root) Ø46.514 mm (1.8313 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-8-16-24t | ANSI B92.1 30° flat-root external spline shaft section, 8/16 pitch, 24 teeth: pitch Ø76.200 mm (3 in), major Ø79.375 mm (3.125 in), minor (root) Ø71.914 mm (2.8312 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-10-20-16t | ANSI B92.1 30° flat-root external spline shaft section, 10/20 pitch, 16 teeth: pitch Ø40.640 mm (1.6 in), major Ø43.180 mm (1.7 in), minor (root) Ø37.211 mm (1.465 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-10-20-20t | ANSI B92.1 30° flat-root external spline shaft section, 10/20 pitch, 20 teeth: pitch Ø50.800 mm (2 in), major Ø53.340 mm (2.1 in), minor (root) Ø47.371 mm (1.865 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
| spline-shaft-ansi-b92-1-6-12-16t | ANSI B92.1 30° flat-root external spline shaft section, 6/12 pitch, 16 teeth: pitch Ø67.733 mm (2.6667 in), major Ø71.967 mm (2.8333 in), minor (root) Ø62.018 mm (2.4417 in); basic tooth (tooth thickness half the circular pitch, no tolerance or effective-variation shift), true involute flank carried down to the root circle (the root fillet is not modelled); the 25.4 mm (1 in) length is an example, no chamfer, no bore | STEP · STL |
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Questions
What is the major diameter of a 16/32 pitch, 24-tooth spline?
External major (N + 1) / P = 25 / 16 = 1.5625 in (39.69 mm); pitch Ø 1.5 in (38.1 mm); external minor (N − 1.2) / P = 1.425 in (36.20 mm).
What do the two numbers in 16/32 mean?
16 is the diametral pitch P (sets pitch diameter N / P and tooth thickness); 32 is the stub pitch Ps = 2 P (sets the shallow tooth depth).
What is the pressure angle of an ANSI B92.1 spline?
30°, 37.5° or 45°; this page is 30° flat root. The file shapes are 30°.