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- 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.
- 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 assure that the specified minimum hardness of 48 HRC at the surface for sizes up to and including 0.372 in., and 45 HRC for sizes over 0.372 in., is met when spline keys are hardened by quenching from the austenitizing temperature and tempered.
- For plated keys, all dimensions are before plating. Because of the high hardness of these products, it is recommended that they not be electroplated.
- Bits are available, but lengths have not been standardized.
- Spline keys shall be furnished as Short Arm Series or Long Arm Series.
- 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
Unit of Measure
Specifications
Product |
N/A Socket Screws |
Unit of Measure |
N/A English |
Nominal Keys and Socket Size |
N/A 0.048 in |
Max. Major Dia. (M) |
N/A 0.0480 in |
Min. Major Dia. (M) |
N/A 0.0470 in |
Max. Minor Dia. (W) |
N/A 0.0370 in |
Min. Minor Dia. (W) |
N/A 0.0360 in |
Number of Splines |
N/A 4 |
Max. Width of Space (N) |
N/A 0.0190 in |
Min. Width of Space (N) |
N/A 0.0180 in |
Max. Length (B) |
N/A 0.438 in |
Min. Length (B) |
N/A 0.250 in |
Max. Short Arm Series Length (C) |
N/A 1.312 in |
Min. Short Arm Series Length (C) |
N/A 1.125 in |
Min. Radius of Bend (R) |
N/A 0.062 in |
Max. Chamfer (K) |
N/A 0.004 in |
