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SOCKET CAP, SHOULDER, AND SET SCREWS, ASME B18.3-2003 |
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| Nominal Key and Socket Size |
M | W | Number of Spline |
N | B | C | R | K | |||||||
| Major Diameter | Minor Diameter | Width of Space | Length | Length | Radius of Bend |
Chamfer | |||||||||
| Short Series | Long Series | ||||||||||||||
| Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Min. | Max. | ||
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| 0.033 0.048 0.048 0.060 |
0.0330 0.0480 0.0480 0.0600 |
0.0320 0.0470 0.0470 0.0590 |
0.0250 0.0370 0.0390 0,0490 |
0.0240 0.0360 0.0380 0.0480 |
4 4 6 6 |
0.0140 0.0190 0.0130 0.0160 |
0.0130 0.0180 0.0120 0.0150 |
0.312 0.438 0.438 0.625 |
0.125 0.250 0.250 0.438 |
1.312 1.312 1.312 1.750 |
1.125 1.125 1.125 1.562 |
... ... ... ... |
... ... ... ... |
0.062 0.062 0.062 0.062 |
0.003 0.004 0.004 0.006 |
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| 0.069 0.072 0.076 0.096 |
0.0690 0.0720 0.0760 0.0960 |
0.0680 0.0710 0.0750 0.0950 |
0.0510 0.0620 0.0530 0.0790 |
0.0500 0.0610 0.0520 0.0775 |
4 6 4 6 |
0.0260 0.0190 0.0280 00240 |
0.0250 0.0180 0.0270 00230 |
0.656 0.656 0.656 0703 |
0.469 0.469 0.469 0516 |
1.844 1.844 1.844 1.969 |
1.656 1.656 1.656 1,781 |
... ... ... ... |
... ... ... ... |
0.062 0.062 0.062 0.078 |
0.007 0.008 0.008 0.008 |
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| 0.111 0.133 0.145 |
0.1110 0.1330 0.1450 |
0.1100 0.1310 0.1435 |
0.0940 0.1140 0.1240 |
00925 0.1120 0.1225 |
6 6 6 |
0.0280 0.0340 0.0355 |
0.0270 0.0320 0.0340 |
0.750 0.797 0.844 |
0.562 0.609 0.656 |
2.094 2.219 2.344 |
1.906 2.031 2.156 |
... 3.656 3.844 |
... 3.469 3.656 |
0.094 0.125 0.125 |
0.009 0.014 0.015 |
| See Notes | 1 | ||||||||||||||
GENERAL NOTE: For additional requirements, refer to Notes (3) through (5) below.
NOTES:
(1) Bits are available, but lengths have not been standardized.
(2) Spline Keys are furnished as Short Arm Series or Long Arm Series.
(3) Each end shall be square with the axis of each arm within 4 deg, and edges may be sharp or chamfered at the option of the manufacturer. The chamfer shall not exceed the values listed.
(4) Material (Steel Alloy). The spline keys shall be fabricated from an alloy steel having two or more of the following
alloying elements: chromium, nickel, molybdenum, or vanadium, in sufficient quantity to ensure that the specified
minimum hardness of 48 HRC at the surface for nominal sizes up to and including 0.372 in., and 45 HRC for nominal
sizes over 0.372 in., is met when spline keys are hardened by quenching from the austenitizing temperature and
tempered.
For plated keys, att dimensions are before plating. Because of the high hardness of these products, it is recommended
that they not be electroplated.
(6) For applicability of keys to various socket screw types and sizes, see Nonmandatory Appendix B, Table B-2.
(7) Designation. To promote uniformity and understanding in communications relating to products conforming to this
Standard, it is recommended that Spline Keys be designated in accordance with the following data, preferably in the
sequence shown:
(a) product name
(b) designation of the standard
(c) nominal key size
(d) series
(e) protective finish, if required
EXAMPLES:
Spline Key, ASME B18.3, 0.111 Short Arm Series
Spline Key, ASME B18.3, 0.372 Long Arm Series, Nickel Plated. [See Note (5).]
Reprinted from ASME B18.3-2003, by permission of The American Society of Mechanical Engineers. All rights reserved.
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