• 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
Request Information
Unit of Measure
Items
Spline Keys and Bits

Spline Key and Bit, with 0.0330" Major Dia.
Spline Keys and Bits

Spline Key and Bit, with 0.0480" Major Dia.
Spline Keys and Bits

Spline Key and Bit, with 0.0480" Major Dia.
Spline Keys and Bits

Spline Key and Bit, with 0.0600" Major Dia.
Spline Keys and Bits

Spline Key and Bit, with 0.0690" Major Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Socket Screws
Codes and Standards N/A ASME B18.3 2002
Unit of Measure N/A English
Nominal Keys and Socket Size N/A 0.033 in N/A 0.048 in N/A 0.048 in N/A 0.060 in N/A 0.069 in
Max. Major Dia. (M) N/A 0.0330 in N/A 0.0480 in N/A 0.0480 in N/A 0.0600 in N/A 0.0690 in
Min. Major Dia. (M) N/A 0.0320 in N/A 0.0470 in N/A 0.0470 in N/A 0.0590 in N/A 0.0680 in
Max. Minor Dia. (W) N/A 0.0250 in N/A 0.0370 in N/A 0.0390 in N/A 0.0490 in N/A 0.0510 in
Min. Minor Dia. (W) N/A 0.0240 in N/A 0.0360 in N/A 0.0380 in N/A 0.0480 in N/A 0.0500 in
Number of Splines N/A 4 N/A 4 N/A 6 N/A 6 N/A 4
Max. Width of Space (N) N/A 0.0140 in N/A 0.0190 in N/A 0.0130 in N/A 0.0160 in N/A 0.0260 in
Min. Width of Space (N) N/A 0.0130 in N/A 0.0180 in N/A 0.0120 in N/A 0.0150 in N/A 0.0250 in
Max. Length (B) N/A 0.312 in N/A 0.438 in N/A 0.438 in N/A 0.625 in N/A 0.656 in
Min. Length (B) N/A 0.125 in N/A 0.250 in N/A 0.250 in N/A 0.438 in N/A 0.469 in
Max. Short Arm Series Length (C) N/A 1.312 in N/A 1.312 in N/A 1.312 in N/A 1.750 in N/A 1.844 in
Min. Short Arm Series Length (C) N/A 1.125 in N/A 1.125 in N/A 1.125 in N/A 1.562 in N/A 1.656 in
Max. Long Arm Series Length (C) N/A
Min. Long Arm Series Length (C) N/A
Min. Radius of Bend (R) N/A 0.062 in
Max. Chamfer (K) N/A 0.003 in N/A 0.004 in N/A 0.004 in N/A 0.006 in N/A 0.007 in
Search Catalog: GO
Use trailing wildcard (*) for broader results.