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| Product – Martin – Sprocket – Catalogue |
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| Standard Keyway Dimensions (Metric) |
| Shaft Diameter |
Key |
Keyway Width |
Keyway Depth |
| Over |
Upto and Inci |
| 6 |
8 |
2x2 |
2 |
1 |
| 8 |
10 |
3x3 |
3 |
1.4 |
| 10 |
12 |
4x4 |
4 |
1.8 |
| 12 |
17 |
5x5 |
5 |
2.3 |
| |
| 17 |
22 |
6x2 |
6 |
2.8 |
| 22 |
30 |
8x7 |
8 |
3.3 |
| 30 |
38 |
10x8 |
10 |
3.3 |
| 38 |
44 |
12x8 |
12 |
3.3 |
| |
| 44 |
50 |
14x9 |
14 |
3.8 |
| 50 |
58 |
16x10 |
16 |
4.3 |
| 58 |
65 |
18x11 |
18 |
4.4 |
| 65 |
75 |
20x12 |
20 |
4.9 |
| |
| 78 |
85 |
22x14 |
22 |
5.4 |
| 85 |
95 |
25x14 |
25 |
5.4 |
| 95 |
110 |
28x16 |
28 |
6.4 |
| 110 |
130 |
32x18 |
32 |
7.4 |
| |
| 130 |
150 |
36x20 |
36 |
8.4 |
| 150 |
170 |
40x22 |
40 |
9.4 |
| 170 |
200 |
45x25 |
45 |
10.4 |
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| Bore Tolerances (Metric) |
| Stock Metric Bores are machined to a minimum H7 Tolerance |
Standard Keyway Dimension (Imperial)
| Shaft Diameter |
Keyway |
Width |
Depth |
| ½‐⁹⁄₁₆ |
⅛ х¹⁄₆ |
⅛ |
¹⁄₁₆ |
| ⁵⁄₈₋⁷⁄₈ |
³⁄₁₆ х ³⁄₁₆ |
³⁄₁₆ |
³⁄₃₂ |
| ¹⁵⁄₁₆⁻1¹⁄₄ |
¼ х ¼ |
¼ |
⅛ |
| 1⁵⁄₁₆₋1³⁄₈ |
⁵⁄₁₆ х ⁵⁄₁₆ |
⁵⁄₁₆ |
⁵⁄₃₂ |
| 1⁷⁄₁₆₋1³⁄₄ |
³⁄₈ х ³⁄₆ |
⅜ |
³⁄₁₆ |
| 1¹³⁄₁₆₋2³⁄₄ |
¹⁄₂ х ¹⁄₂ |
½ |
¼ |
| 2⁵⁄₁₆₋2³⁄₄ |
⁵⁄₈ х ⁵⁄₈ |
⅚ |
⁵⁄₁₆ |
| 2¹³⁄₁₆₋3¹⁄₄ |
¾ х ¾ |
¾ |
⅜ |
| 3⁵⁄₁₆₋3³⁄₄ |
⁷⁄₈ х ⁷⁄₈ |
⅞ |
⁷⁄₁₆ |
| 3¹³⁄₁₆₋4¹⁄₂ |
1 х 1 |
1 |
½ |
| 4⁹⁄₁₆₋5¹⁄₂ |
1¼ х 1¼ |
1¼ |
⅝ |
| 5⁹⁄₁₆₋6¹⁄₂ |
1½ х 1½ |
1½ |
¾ |
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| Bore Tolerances (Imperial) |
| 1 and Less |
+.001-.000 |
| 1 to 2 |
+.002-.000 |
| 2 to 3 |
+.003-.000 |
| 3 & up |
+.004-.000 |
| bores with closer tolerances will be |
| supplied at a slight increase in price |
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