SuperNX / Tools / ANSI fit chart
ANSI Fit Chart
How to read the chart
Find the row whose size range contains your basic size: over the first value, up to and including the second. Every number is in thousandths of an inch and is added to the basic size, so +0.8 means +0.0008 in. The hole always starts at the basic size (lower limit 0), which is why US drawings call this the basic-hole system. Clearance columns give the minimum and maximum gap; interference columns give the minimum and maximum overlap. In the transition (LT) tables a minus sign means interference and a plus sign means clearance.
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Running and sliding fits (RC)
Clearance fits for parts that turn or slide, with an allowance for lubrication. RC1 and RC2 locate accurately and slide without play rather than run freely. RC3 and RC4 are precision and close running fits for accurate machinery. RC5 and RC6 suit higher speeds or heavier journal loads, RC7 is free running where accuracy matters less or temperatures vary widely, and RC8 and RC9 are loose running fits for commercial tolerances.
| Size (in)over – to | RC1H5/g4 | RC2H6/g5 | RC3H7/f6 | RC4H8/f7 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | |
| 0.00 – 0.12 | 0.1 – 0.45 | +0.2 / 0 | −0.1 / −0.25 | 0.1 – 0.55 | +0.25 / 0 | −0.1 / −0.3 | 0.3 – 0.95 | +0.4 / 0 | −0.3 / −0.55 | 0.3 – 1.3 | +0.6 / 0 | −0.3 / −0.7 |
| 0.12 – 0.24 | 0.15 – 0.5 | +0.2 / 0 | −0.15 / −0.3 | 0.15 – 0.65 | +0.3 / 0 | −0.15 / −0.35 | 0.4 – 1.2 | +0.5 / 0 | −0.4 / −0.7 | 0.4 – 1.6 | +0.7 / 0 | −0.4 / −0.9 |
| 0.24 – 0.40 | 0.2 – 0.6 | +0.25 / 0 | −0.2 / −0.35 | 0.2 – 0.85 | +0.4 / 0 | −0.2 / −0.45 | 0.5 – 1.5 | +0.6 / 0 | −0.5 / −0.9 | 0.5 – 2.0 | +0.9 / 0 | −0.5 / −1.1 |
| 0.40 – 0.71 | 0.25 – 0.75 | +0.3 / 0 | −0.25 / −0.45 | 0.25 – 0.95 | +0.4 / 0 | −0.25 / −0.55 | 0.6 – 1.7 | +0.7 / 0 | −0.6 / −1.0 | 0.6 – 2.3 | +1.0 / 0 | −0.6 / −1.3 |
| 0.71 – 1.19 | 0.3 – 0.95 | +0.4 / 0 | −0.3 / −0.55 | 0.3 – 1.2 | +0.5 / 0 | −0.3 / −0.7 | 0.8 – 2.1 | +0.8 / 0 | −0.8 / −1.3 | 0.8 – 2.8 | +1.2 / 0 | −0.8 / −1.6 |
| 1.19 – 1.97 | 0.4 – 1.1 | +0.4 / 0 | −0.4 / −0.7 | 0.4 – 1.4 | +0.6 / 0 | −0.4 / −0.8 | 1.0 – 2.6 | +1.0 / 0 | −1.0 / −1.6 | 1.0 – 3.6 | +1.6 / 0 | −1.0 / −2.0 |
| 1.97 – 3.15 | 0.4 – 1.2 | +0.5 / 0 | −0.4 / −0.7 | 0.4 – 1.6 | +0.7 / 0 | −0.4 / −0.9 | 1.2 – 3.1 | +1.2 / 0 | −1.2 / −1.9 | 1.2 – 4.2 | +1.8 / 0 | −1.2 / −2.4 |
| 3.15 – 4.73 | 0.5 – 1.5 | +0.6 / 0 | −0.5 / −0.9 | 0.5 – 2.0 | +0.9 / 0 | −0.5 / −1.1 | 1.4 – 3.7 | +1.4 / 0 | −1.4 / −2.3 | 1.4 – 5.0 | +2.2 / 0 | −1.4 / −2.8 |
| 4.73 – 7.09 | 0.6 – 1.8 | +0.7 / 0 | −0.6 / −1.1 | 0.6 – 2.3 | +1.0 / 0 | −0.6 / −1.3 | 1.6 – 4.2 | +1.6 / 0 | −1.6 / −2.6 | 1.6 – 5.7 | +2.5 / 0 | −1.6 / −3.2 |
| 7.09 – 9.85 | 0.6 – 2.0 | +0.8 / 0 | −0.6 / −1.2 | 0.6 – 2.6 | +1.2 / 0 | −0.6 / −1.4 | 2.0 – 5.0 | +1.8 / 0 | −2.0 / −3.2 | 2.0 – 6.6 | +2.8 / 0 | −2.0 / −3.8 |
| 9.85 – 12.41 | 0.8 – 2.3 | +0.9 / 0 | −0.8 / −1.4 | 0.8 – 2.9 | +1.2 / 0 | −0.8 / −1.7 | 2.5 – 5.7 | +2.0 / 0 | −2.5 / −3.7 | 2.5 – 7.5 | +3.0 / 0 | −2.5 / −4.5 |
| 12.41 – 15.75 | 1.0 – 2.7 | +1.0 / 0 | −1.0 / −1.7 | 1.0 – 3.4 | +1.4 / 0 | −1.0 / −2.0 | 3.0 – 6.6 | +2.2 / 0 | −3.0 / −4.4 | 3.0 – 8.7 | +3.5 / 0 | −3.0 / −5.2 |
| 15.75 – 19.69 | 1.2 – 3.0 | +1.0 / 0 | −1.2 / −2.0 | 1.2 – 3.8 | +1.6 / 0 | −1.2 / −2.2 | 4.0 – 8.1 | +2.5 / 0 | −4.0 / −5.6 | 4.0 – 10.5 | +4.0 / 0 | −4.0 / −6.5 |
| Size (in)over – to | RC5H8/e7 | RC6H9/e8 | RC7H9/d8 | RC8H10/c9 | RC9H11/— | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | |
| 0.00 – 0.12 | 0.6 – 1.6 | +0.6 / 0 | −0.6 / −1.0 | 0.6 – 2.2 | +1.0 / 0 | −0.6 / −1.2 | 1.0 – 2.6 | +1.0 / 0 | −1.0 / −1.6 | 2.5 – 5.1 | +1.6 / 0 | −2.5 / −3.5 | 4.0 – 8.1 | +2.5 / 0 | −4.0 / −5.6 |
| 0.12 – 0.24 | 0.8 – 2.0 | +0.7 / 0 | −0.8 / −1.3 | 0.8 – 2.7 | +1.2 / 0 | −0.8 / −1.5 | 1.2 – 3.1 | +1.2 / 0 | −1.2 / −1.9 | 2.8 – 5.8 | +1.8 / 0 | −2.8 / −4.0 | 4.5 – 9.0 | +3.0 / 0 | −4.5 / −6.0 |
| 0.24 – 0.40 | 1.0 – 2.5 | +0.9 / 0 | −1.0 / −1.6 | 1.0 – 3.3 | +1.4 / 0 | −1.0 / −1.9 | 1.6 – 3.9 | +1.4 / 0 | −1.6 / −2.5 | 3.0 – 6.6 | +2.2 / 0 | −3.0 / −4.4 | 5.0 – 10.7 | +3.5 / 0 | −5.0 / −7.2 |
| 0.40 – 0.71 | 1.2 – 2.9 | +1.0 / 0 | −1.2 / −1.9 | 1.2 – 3.8 | +1.6 / 0 | −1.2 / −2.2 | 2.0 – 4.6 | +1.6 / 0 | −2.0 / −3.0 | 3.5 – 7.9 | +2.8 / 0 | −3.5 / −5.1 | 6.0 – 12.8 | +4.0 / 0 | −6.0 / −8.8 |
| 0.71 – 1.19 | 1.6 – 3.6 | +1.2 / 0 | −1.6 / −2.4 | 1.6 – 4.8 | +2.0 / 0 | −1.6 / −2.8 | 2.5 – 5.7 | +2.0 / 0 | −2.5 / −3.7 | 4.5 – 10.0 | +3.5 / 0 | −4.5 / −6.5 | 7.0 – 15.5 | +5.0 / 0 | −7.0 / −10.5 |
| 1.19 – 1.97 | 2.0 – 4.6 | +1.6 / 0 | −2.0 / −3.0 | 2.0 – 6.1 | +2.5 / 0 | −2.0 / −3.6 | 3.0 – 7.1 | +2.5 / 0 | −3.0 / −4.6 | 5.0 – 11.5 | +4.0 / 0 | −5.0 / −7.5 | 8.0 – 18.0 | +6.0 / 0 | −8.0 / −12.0 |
| 1.97 – 3.15 | 2.5 – 5.5 | +1.8 / 0 | −2.5 / −3.7 | 2.5 – 7.3 | +3.0 / 0 | −2.5 / −4.3 | 4.0 – 8.8 | +3.0 / 0 | −4.0 / −5.8 | 6.0 – 13.5 | +4.5 / 0 | −6.0 / −9.0 | 9.0 – 20.5 | +7.0 / 0 | −9.0 / −13.5 |
| 3.15 – 4.73 | 3.0 – 6.6 | +2.2 / 0 | −3.0 / −4.4 | 3.0 – 8.7 | +3.5 / 0 | −3.0 / −5.2 | 5.0 – 10.7 | +3.5 / 0 | −5.0 / −7.2 | 7.0 – 15.5 | +5.0 / 0 | −7.0 / −10.5 | 10.0 – 24.0 | +9.0 / 0 | −10.0 / −15.0 |
| 4.73 – 7.09 | 3.5 – 7.6 | +2.5 / 0 | −3.5 / −5.1 | 3.5 – 10.0 | +4.0 / 0 | −3.5 / −6.0 | 6.0 – 12.5 | +4.0 / 0 | −6.0 / −8.5 | 8.0 – 18.0 | +6.0 / 0 | −8.0 / −12.0 | 12.0 – 28.0 | +10.0 / 0 | −12.0 / −18.0 |
| 7.09 – 9.85 | 4.0 – 8.6 | +2.8 / 0 | −4.0 / −5.8 | 4.0 – 11.3 | +4.5 / 0 | −4.0 / −6.8 | 7.0 – 14.3 | +4.5 / 0 | −7.0 / −9.8 | 10.0 – 21.5 | +7.0 / 0 | −10.0 / −14.5 | 15.0 – 34.0 | +12.0 / 0 | −15.0 / −22.0 |
| 9.85 – 12.41 | 5.0 – 10.0 | +3.0 / 0 | −5.0 / −7.0 | 5.0 – 13.0 | +5.0 / 0 | −5.0 / −8.0 | 8.0 – 16.0 | +5.0 / 0 | −8.0 / −11.0 | 12.0 – 25.0 | +8.0 / 0 | −12.0 / −17.0 | 18.0 – 38.0 | +12.0 / 0 | −18.0 / −26.0 |
| 12.41 – 15.75 | 6.0 – 11.7 | +3.5 / 0 | −6.0 / −8.2 | 6.0 – 15.5 | +6.0 / 0 | −6.0 / −9.5 | 10.0 – 19.5 | +6.0 / 0 | −10.0 / −13.5 | 14.0 – 29.0 | +9.0 / 0 | −14.0 / −20.0 | 22.0 – 45.0 | +14.0 / 0 | −22.0 / −31.0 |
| 15.75 – 19.69 | 8.0 – 14.5 | +4.0 / 0 | −8.0 / −10.5 | 8.0 – 18.0 | +6.0 / 0 | −8.0 / −12.0 | 12.0 – 22.0 | +6.0 / 0 | −12.0 / −16.0 | 16.0 – 32.0 | +10.0 / 0 | −16.0 / −22.0 | 25.0 – 51.0 | +16.0 / 0 | −25.0 / −35.0 |
Locational clearance fits (LC)
For parts that normally do not move but must assemble and come apart freely. LC1 to LC4 have zero minimum clearance (snug fits for accurate location); from LC5 up the minimum clearance and the tolerances grow, ending with loose fastener fits in LC9 to LC11, where easy assembly matters more than location.
| Size (in)over – to | LC1H6/h5 | LC2H7/h6 | LC3H8/h7 | LC4H10/h9 | LC5H7/g6 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | |
| 0.00 – 0.12 | 0 – 0.45 | +0.25 / 0 | 0 / −0.2 | 0 – 0.65 | +0.4 / 0 | 0 / −0.25 | 0 – 1.0 | +0.6 / 0 | 0 / −0.4 | 0 – 2.6 | +1.6 / 0 | 0 / −1.0 | 0.1 – 0.75 | +0.4 / 0 | −0.1 / −0.35 |
| 0.12 – 0.24 | 0 – 0.5 | +0.3 / 0 | 0 / −0.2 | 0 – 0.8 | +0.5 / 0 | 0 / −0.3 | 0 – 1.2 | +0.7 / 0 | 0 / −0.5 | 0 – 3.0 | +1.8 / 0 | 0 / −1.2 | 0.15 – 0.95 | +0.5 / 0 | −0.15 / −0.45 |
| 0.24 – 0.40 | 0 – 0.65 | +0.4 / 0 | 0 / −0.25 | 0 – 1.0 | +0.6 / 0 | 0 / −0.4 | 0 – 1.5 | +0.9 / 0 | 0 / −0.6 | 0 – 3.6 | +2.2 / 0 | 0 / −1.4 | 0.2 – 1.2 | +0.6 / 0 | −0.2 / −0.6 |
| 0.40 – 0.71 | 0 – 0.7 | +0.4 / 0 | 0 / −0.3 | 0 – 1.1 | +0.7 / 0 | 0 / −0.4 | 0 – 1.7 | +1.0 / 0 | 0 / −0.7 | 0 – 4.4 | +2.8 / 0 | 0 / −1.6 | 0.25 – 1.35 | +0.7 / 0 | −0.25 / −0.65 |
| 0.71 – 1.19 | 0 – 0.9 | +0.5 / 0 | 0 / −0.4 | 0 – 1.3 | +0.8 / 0 | 0 / −0.5 | 0 – 2.0 | +1.2 / 0 | 0 / −0.8 | 0 – 5.5 | +3.5 / 0 | 0 / −2.0 | 0.3 – 1.6 | +0.8 / 0 | −0.3 / −0.8 |
| 1.19 – 1.97 | 0 – 1.0 | +0.6 / 0 | 0 / −0.4 | 0 – 1.6 | +1.0 / 0 | 0 / −0.6 | 0 – 2.6 | +1.6 / 0 | 0 / −1.0 | 0 – 6.5 | +4.0 / 0 | 0 / −2.5 | 0.4 – 2.0 | +1.0 / 0 | −0.4 / −1.0 |
| 1.97 – 3.15 | 0 – 1.2 | +0.7 / 0 | 0 / −0.5 | 0 – 1.9 | +1.2 / 0 | 0 / −0.7 | 0 – 3.0 | +1.8 / 0 | 0 / −1.2 | 0 – 7.5 | +4.5 / 0 | 0 / −3.0 | 0.4 – 2.3 | +1.2 / 0 | −0.4 / −1.1 |
| 3.15 – 4.73 | 0 – 1.5 | +0.9 / 0 | 0 / −0.6 | 0 – 2.3 | +1.4 / 0 | 0 / −0.9 | 0 – 3.6 | +2.2 / 0 | 0 / −1.4 | 0 – 8.5 | +5.0 / 0 | 0 / −3.5 | 0.5 – 2.8 | +1.4 / 0 | −0.5 / −1.4 |
| 4.73 – 7.09 | 0 – 1.7 | +1.0 / 0 | 0 / −0.7 | 0 – 2.6 | +1.6 / 0 | 0 / −1.0 | 0 – 4.1 | +2.5 / 0 | 0 / −1.6 | 0 – 10.0 | +6.0 / 0 | 0 / −4.0 | 0.6 – 3.2 | +1.6 / 0 | −0.6 / −1.6 |
| 7.09 – 9.85 | 0 – 2.0 | +1.2 / 0 | 0 / −0.8 | 0 – 3.0 | +1.8 / 0 | 0 / −1.2 | 0 – 4.6 | +2.8 / 0 | 0 / −1.8 | 0 – 11.5 | +7.0 / 0 | 0 / −4.5 | 0.6 – 3.6 | +1.8 / 0 | −0.6 / −1.8 |
| 9.85 – 12.41 | 0 – 2.1 | +1.2 / 0 | 0 / −0.9 | 0 – 3.2 | +2.0 / 0 | 0 / −1.2 | 0 – 5.0 | +3.0 / 0 | 0 / −2.0 | 0 – 13.0 | +8.0 / 0 | 0 / −5.0 | 0.7 – 3.9 | +2.0 / 0 | −0.7 / −1.9 |
| 12.41 – 15.75 | 0 – 2.4 | +1.4 / 0 | 0 / −1.0 | 0 – 3.6 | +2.2 / 0 | 0 / −1.4 | 0 – 5.7 | +3.5 / 0 | 0 / −2.2 | 0 – 15.0 | +9.0 / 0 | 0 / −6.0 | 0.7 – 4.3 | +2.2 / 0 | −0.7 / −2.1 |
| 15.75 – 19.69 | 0 – 2.6 | +1.6 / 0 | 0 / −1.0 | 0 – 4.1 | +2.5 / 0 | 0 / −1.6 | 0 – 6.5 | +4.0 / 0 | 0 / −2.5 | 0 – 16.0 | +10.0 / 0 | 0 / −6.0 | 0.8 – 4.9 | +2.5 / 0 | −0.8 / −2.4 |
| Size (in)over – to | LC6H9/f8 | LC7H10/e9 | LC8H10/d9 | LC9H11/c10 | LC10H12/— | LC11H13/— | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | Clear. | Hole | Shaft | |
| 0.00 – 0.12 | 0.3 – 1.9 | +1.0 / 0 | −0.3 / −0.9 | 0.6 – 3.2 | +1.6 / 0 | −0.6 / −1.6 | 1.0 – 3.6 | +1.6 / 0 | −1.0 / −2.0 | 2.5 – 6.6 | +2.5 / 0 | −2.5 / −4.1 | 4.0 – 12.0 | +4.0 / 0 | −4.0 / −8.0 | 5.0 – 17.0 | +6.0 / 0 | −5.0 / −11.0 |
| 0.12 – 0.24 | 0.4 – 2.3 | +1.2 / 0 | −0.4 / −1.1 | 0.8 – 3.8 | +1.8 / 0 | −0.8 / −2.0 | 1.2 – 4.2 | +1.8 / 0 | −1.2 / −2.4 | 2.8 – 7.6 | +3.0 / 0 | −2.8 / −4.6 | 4.5 – 14.5 | +5.0 / 0 | −4.5 / −9.5 | 6.0 – 20.0 | +7.0 / 0 | −6.0 / −13.0 |
| 0.24 – 0.40 | 0.5 – 2.8 | +1.4 / 0 | −0.5 / −1.4 | 1.0 – 4.6 | +2.2 / 0 | −1.0 / −2.4 | 1.6 – 5.2 | +2.2 / 0 | −1.6 / −3.0 | 3.0 – 8.7 | +3.5 / 0 | −3.0 / −5.2 | 5.0 – 17.0 | +6.0 / 0 | −5.0 / −11.0 | 7.0 – 25.0 | +9.0 / 0 | −7.0 / −16.0 |
| 0.40 – 0.71 | 0.6 – 3.2 | +1.6 / 0 | −0.6 / −1.6 | 1.2 – 5.6 | +2.8 / 0 | −1.2 / −2.8 | 2.0 – 6.4 | +2.8 / 0 | −2.0 / −3.6 | 3.5 – 10.3 | +4.0 / 0 | −3.5 / −6.3 | 6.0 – 20.0 | +7.0 / 0 | −6.0 / −13.0 | 8.0 – 28.0 | +10.0 / 0 | −8.0 / −18.0 |
| 0.71 – 1.19 | 0.8 – 4.0 | +2.0 / 0 | −0.8 / −2.0 | 1.6 – 7.1 | +3.5 / 0 | −1.6 / −3.6 | 2.5 – 8.0 | +3.5 / 0 | −2.5 / −4.5 | 4.5 – 13.0 | +5.0 / 0 | −4.5 / −8.0 | 7.0 – 23.0 | +8.0 / 0 | −7.0 / −15.0 | 10.0 – 34.0 | +12.0 / 0 | −10.0 / −22.0 |
| 1.19 – 1.97 | 1.0 – 5.1 | +2.5 / 0 | −1.0 / −2.6 | 2.0 – 8.5 | +4.0 / 0 | −2.0 / −4.5 | 3.0 – 9.5 | +4.0 / 0 | −3.0 / −5.5 | 5.0 – 15.0 | +6.0 / 0 | −5.0 / −9.0 | 8.0 – 28.0 | +10.0 / 0 | −8.0 / −18.0 | 12.0 – 44.0 | +16.0 / 0 | −12.0 / −28.0 |
| 1.97 – 3.15 | 1.2 – 6.0 | +3.0 / 0 | −1.2 / −3.0 | 2.5 – 10.0 | +4.5 / 0 | −2.5 / −5.5 | 4.0 – 11.5 | +4.5 / 0 | −4.0 / −7.0 | 6.0 – 17.5 | +7.0 / 0 | −6.0 / −10.5 | 10.0 – 34.0 | +12.0 / 0 | −10.0 / −22.0 | 14.0 – 50.0 | +18.0 / 0 | −14.0 / −32.0 |
| 3.15 – 4.73 | 1.4 – 7.1 | +3.5 / 0 | −1.4 / −3.6 | 3.0 – 11.5 | +5.0 / 0 | −3.0 / −6.5 | 5.0 – 13.5 | +5.0 / 0 | −5.0 / −8.5 | 7.0 – 21.0 | +9.0 / 0 | −7.0 / −12.0 | 11.0 – 39.0 | +14.0 / 0 | −11.0 / −25.0 | 16.0 – 60.0 | +22.0 / 0 | −16.0 / −38.0 |
| 4.73 – 7.09 | 1.6 – 8.1 | +4.0 / 0 | −1.6 / −4.1 | 3.5 – 13.5 | +6.0 / 0 | −3.5 / −7.5 | 6.0 – 16.0 | +6.0 / 0 | −6.0 / −10.0 | 8.0 – 24.0 | +10.0 / 0 | −8.0 / −14.0 | 12.0 – 44.0 | +16.0 / 0 | −12.0 / −28.0 | 18.0 – 68.0 | +25.0 / 0 | −18.0 / −43.0 |
| 7.09 – 9.85 | 2.0 – 9.3 | +4.5 / 0 | −2.0 / −4.8 | 4.0 – 15.5 | +7.0 / 0 | −4.0 / −8.5 | 7.0 – 18.5 | +7.0 / 0 | −7.0 / −11.5 | 10.0 – 29.0 | +12.0 / 0 | −10.0 / −17.0 | 16.0 – 52.0 | +18.0 / 0 | −16.0 / −34.0 | 22.0 – 78.0 | +28.0 / 0 | −22.0 / −50.0 |
| 9.85 – 12.41 | 2.2 – 10.2 | +5.0 / 0 | −2.2 / −5.2 | 4.5 – 17.5 | +8.0 / 0 | −4.5 / −9.5 | 7.0 – 20.0 | +8.0 / 0 | −7.0 / −12.0 | 12.0 – 32.0 | +12.0 / 0 | −12.0 / −20.0 | 20.0 – 60.0 | +20.0 / 0 | −20.0 / −40.0 | 28.0 – 88.0 | +30.0 / 0 | −28.0 / −58.0 |
| 12.41 – 15.75 | 2.5 – 12.0 | +6.0 / 0 | −2.5 / −6.0 | 5.0 – 20.0 | +9.0 / 0 | −5.0 / −11.0 | 8.0 – 23.0 | +9.0 / 0 | −8.0 / −14.0 | 14.0 – 37.0 | +14.0 / 0 | −14.0 / −23.0 | 22.0 – 66.0 | +22.0 / 0 | −22.0 / −44.0 | 30.0 – 100.0 | +35.0 / 0 | −30.0 / −65.0 |
| 15.75 – 19.69 | 2.8 – 12.8 | +6.0 / 0 | −2.8 / −6.8 | 5.0 – 21.0 | +10.0 / 0 | −5.0 / −11.0 | 9.0 – 25.0 | +10.0 / 0 | −9.0 / −15.0 | 16.0 – 42.0 | +16.0 / 0 | −16.0 / −26.0 | 25.0 – 75.0 | +25.0 / 0 | −25.0 / −50.0 | 35.0 – 115.0 | +40.0 / 0 | −35.0 / −75.0 |
Locational transition fits (LT)
A compromise for accurate location where a little clearance or a little interference is acceptable. LT3 and LT4 are not tabulated below 0.24 in.
| Size (in)over – to | LT1H7/js6 | LT2H8/js7 | LT3H7/k6 | LT4H8/k7 | LT5H7/n6 | LT6H7/n7 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fit | Hole | Shaft | Fit | Hole | Shaft | Fit | Hole | Shaft | Fit | Hole | Shaft | Fit | Hole | Shaft | Fit | Hole | Shaft | |
| 0.00 – 0.12 | −0.12 / +0.52 | +0.4 / 0 | +0.12 / −0.12 | −0.2 / +0.8 | +0.6 / 0 | +0.2 / −0.2 | not tabulated | not tabulated | −0.5 / +0.15 | +0.4 / 0 | +0.5 / +0.25 | −0.65 / +0.15 | +0.4 / 0 | +0.65 / +0.25 | ||||
| 0.12 – 0.24 | −0.15 / +0.65 | +0.5 / 0 | +0.15 / −0.15 | −0.25 / +0.95 | +0.7 / 0 | +0.25 / −0.25 | not tabulated | not tabulated | −0.6 / +0.2 | +0.5 / 0 | +0.6 / +0.3 | −0.8 / +0.2 | +0.5 / 0 | +0.8 / +0.3 | ||||
| 0.24 – 0.40 | −0.2 / +0.8 | +0.6 / 0 | +0.2 / −0.2 | −0.3 / +1.2 | +0.9 / 0 | +0.3 / −0.3 | −0.5 / +0.5 | +0.6 / 0 | +0.5 / +0.1 | −0.7 / +0.8 | +0.9 / 0 | +0.7 / +0.1 | −0.8 / +0.2 | +0.6 / 0 | +0.8 / +0.4 | −1.0 / +0.2 | +0.6 / 0 | +1.0 / +0.4 |
| 0.40 – 0.71 | −0.2 / +0.9 | +0.7 / 0 | +0.2 / −0.2 | −0.35 / +1.35 | +1.0 / 0 | +0.35 / −0.35 | −0.5 / +0.6 | +0.7 / 0 | +0.5 / +0.1 | −0.8 / +0.9 | +1.0 / 0 | +0.8 / +0.1 | −0.9 / +0.2 | +0.7 / 0 | +0.9 / +0.5 | −1.2 / +0.2 | +0.7 / 0 | +1.2 / +0.5 |
| 0.71 – 1.19 | −0.25 / +1.05 | +0.8 / 0 | +0.25 / −0.25 | −0.4 / +1.6 | +1.2 / 0 | +0.4 / −0.4 | −0.6 / +0.7 | +0.8 / 0 | +0.6 / +0.1 | −0.9 / +1.1 | +1.2 / 0 | +0.9 / +0.1 | −1.1 / +0.2 | +0.8 / 0 | +1.1 / +0.6 | −1.4 / +0.2 | +0.8 / 0 | +1.4 / +0.6 |
| 1.19 – 1.97 | −0.3 / +1.3 | +1.0 / 0 | +0.3 / −0.3 | −0.5 / +2.1 | +1.6 / 0 | +0.5 / −0.5 | −0.7 / +0.9 | +1.0 / 0 | +0.7 / +0.1 | −1.1 / +1.5 | +1.6 / 0 | +1.1 / +0.1 | −1.3 / +0.3 | +1.0 / 0 | +1.3 / +0.7 | −1.7 / +0.3 | +1.0 / 0 | +1.7 / +0.7 |
| 1.97 – 3.15 | −0.3 / +1.5 | +1.2 / 0 | +0.3 / −0.3 | −0.6 / +2.4 | +1.8 / 0 | +0.6 / −0.6 | −0.8 / +1.1 | +1.2 / 0 | +0.8 / +0.1 | −1.3 / +1.7 | +1.8 / 0 | +1.3 / +0.1 | −1.5 / +0.4 | +1.2 / 0 | +1.5 / +0.8 | −2.0 / +0.4 | +1.2 / 0 | +2.0 / +0.8 |
| 3.15 – 4.73 | −0.4 / +1.8 | +1.4 / 0 | +0.4 / −0.4 | −0.7 / +2.9 | +2.2 / 0 | +0.7 / −0.7 | −1.0 / +1.3 | +1.4 / 0 | +1.0 / +0.1 | −1.5 / +2.1 | +2.2 / 0 | +1.5 / +0.1 | −1.9 / +0.4 | +1.4 / 0 | +1.9 / +1.0 | −2.4 / +0.4 | +1.4 / 0 | +2.4 / +1.0 |
| 4.73 – 7.09 | −0.5 / +2.1 | +1.6 / 0 | +0.5 / −0.5 | −0.8 / +3.3 | +2.5 / 0 | +0.8 / −0.8 | −1.1 / +1.5 | +1.6 / 0 | +1.1 / +0.1 | −1.7 / +2.4 | +2.5 / 0 | +1.7 / +0.1 | −2.2 / +0.4 | +1.6 / 0 | +2.2 / +1.2 | −2.8 / +0.4 | +1.6 / 0 | +2.8 / +1.2 |
| 7.09 – 9.85 | −0.6 / +2.4 | +1.8 / 0 | +0.6 / −0.6 | −0.9 / +3.7 | +2.8 / 0 | +0.9 / −0.9 | −1.4 / +1.6 | +1.8 / 0 | +1.4 / +0.2 | −2.0 / +2.6 | +2.8 / 0 | +2.0 / +0.2 | −2.6 / +0.4 | +1.8 / 0 | +2.6 / +1.4 | −3.2 / +0.4 | +1.8 / 0 | +3.2 / +1.4 |
| 9.85 – 12.41 | −0.6 / +2.6 | +2.0 / 0 | +0.6 / −0.6 | −1.0 / +4.0 | +3.0 / 0 | +1.0 / −1.0 | −1.4 / +1.8 | +2.0 / 0 | +1.4 / +0.2 | −2.2 / +2.8 | +3.0 / 0 | +2.2 / +0.2 | −2.6 / +0.6 | +2.0 / 0 | +2.6 / +1.4 | −3.4 / +0.6 | +2.0 / 0 | +3.4 / +1.4 |
| 12.41 – 15.75 | −0.7 / +2.9 | +2.2 / 0 | +0.7 / −0.7 | −1.0 / +4.5 | +3.5 / 0 | +1.0 / −1.0 | −1.6 / +2.0 | +2.2 / 0 | +1.6 / +0.2 | −2.4 / +3.3 | +3.5 / 0 | +2.4 / +0.2 | −3.0 / +0.6 | +2.2 / 0 | +3.0 / +1.6 | −3.8 / +0.6 | +2.2 / 0 | +3.8 / +1.6 |
| 15.75 – 19.69 | −0.8 / +3.3 | +2.5 / 0 | +0.8 / −0.8 | −1.2 / +5.2 | +4.0 / 0 | +1.2 / −1.2 | −1.8 / +2.3 | +2.5 / 0 | +1.8 / +0.2 | −2.7 / +3.8 | +4.0 / 0 | +2.7 / +0.2 | −3.4 / +0.7 | +2.5 / 0 | +3.4 / +1.8 | −4.3 / +0.7 | +2.5 / 0 | +4.3 / +1.8 |
Locational interference fits (LN)
Interference fits for location, rigidity and alignment. They are not meant to carry load through friction; that is what force fits are for.
| Size (in)over – to | LN1H6/n5 | LN2H7/p6 | LN3H7/r6 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Interf. | Hole | Shaft | Interf. | Hole | Shaft | Interf. | Hole | Shaft | |
| 0.00 – 0.12 | 0 – 0.45 | +0.25 / 0 | +0.45 / +0.25 | 0 – 0.65 | +0.4 / 0 | +0.65 / +0.4 | 0.1 – 0.75 | +0.4 / 0 | +0.75 / +0.5 |
| 0.12 – 0.24 | 0 – 0.5 | +0.3 / 0 | +0.5 / +0.3 | 0 – 0.8 | +0.5 / 0 | +0.8 / +0.5 | 0.1 – 0.9 | +0.5 / 0 | +0.9 / +0.6 |
| 0.24 – 0.40 | 0 – 0.65 | +0.4 / 0 | +0.65 / +0.4 | 0 – 1.0 | +0.6 / 0 | +1.0 / +0.6 | 0.2 – 1.2 | +0.6 / 0 | +1.2 / +0.8 |
| 0.40 – 0.71 | 0 – 0.8 | +0.4 / 0 | +0.8 / +0.4 | 0 – 1.1 | +0.7 / 0 | +1.1 / +0.7 | 0.3 – 1.4 | +0.7 / 0 | +1.4 / +1.0 |
| 0.71 – 1.19 | 0 – 1.0 | +0.5 / 0 | +1.0 / +0.5 | 0 – 1.3 | +0.8 / 0 | +1.3 / +0.8 | 0.4 – 1.7 | +0.8 / 0 | +1.7 / +1.2 |
| 1.19 – 1.97 | 0 – 1.1 | +0.6 / 0 | +1.1 / +0.6 | 0 – 1.6 | +1.0 / 0 | +1.6 / +1.0 | 0.4 – 2.0 | +1.0 / 0 | +2.0 / +1.4 |
| 1.97 – 3.15 | 0.1 – 1.3 | +0.7 / 0 | +1.3 / +0.8 | 0.2 – 2.1 | +1.2 / 0 | +2.1 / +1.4 | 0.4 – 2.3 | +1.2 / 0 | +2.3 / +1.6 |
| 3.15 – 4.73 | 0.1 – 1.6 | +0.9 / 0 | +1.6 / +1.0 | 0.2 – 2.5 | +1.4 / 0 | +2.5 / +1.6 | 0.6 – 2.9 | +1.4 / 0 | +2.9 / +2.0 |
| 4.73 – 7.09 | 0.2 – 1.9 | +1.0 / 0 | +1.9 / +1.2 | 0.2 – 2.8 | +1.6 / 0 | +2.8 / +1.8 | 0.9 – 3.5 | +1.6 / 0 | +3.5 / +2.5 |
| 7.09 – 9.85 | 0.2 – 2.2 | +1.2 / 0 | +2.2 / +1.4 | 0.2 – 3.2 | +1.8 / 0 | +3.2 / +2.0 | 1.2 – 4.2 | +1.8 / 0 | +4.2 / +3.0 |
| 9.85 – 12.41 | 0.2 – 2.3 | +1.2 / 0 | +2.3 / +1.4 | 0.2 – 3.4 | +2.0 / 0 | +3.4 / +2.2 | 1.5 – 4.7 | +2.0 / 0 | +4.7 / +3.5 |
| 12.41 – 15.75 | 0.2 – 2.6 | +1.4 / 0 | +2.6 / +1.6 | 0.3 – 3.9 | +2.2 / 0 | +3.9 / +2.5 | 2.3 – 5.9 | +2.2 / 0 | +5.9 / +4.5 |
| 15.75 – 19.69 | 0.2 – 2.8 | +1.6 / 0 | +2.8 / +1.8 | 0.3 – 4.4 | +2.5 / 0 | +4.4 / +2.8 | 2.5 – 6.6 | +2.5 / 0 | +6.6 / +5.0 |
Force and shrink fits (FN)
Interference fits that hold by bore pressure. FN1 is a light drive fit for thin sections, long fits or cast-iron hubs; FN2 a medium drive fit for ordinary steel parts or shrink fits on light sections; FN3 a heavy drive fit for heavier steel parts; FN4 and FN5 force fits for highly stressed parts or shrink fits where pressing is impractical. FN has finer size steps because the interference grows almost in proportion to diameter. FN3 is not tabulated below 0.95 in.
| Size (in)over – to | FN1H6/— | FN2H7/s6 | FN3H7/t6 | FN4H7/u6 | FN5H8/x7 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Interf. | Hole | Shaft | Interf. | Hole | Shaft | Interf. | Hole | Shaft | Interf. | Hole | Shaft | Interf. | Hole | Shaft | |
| 0.00 – 0.12 | 0.05 – 0.5 | +0.25 / 0 | +0.5 / +0.3 | 0.2 – 0.85 | +0.4 / 0 | +0.85 / +0.6 | not tabulated | 0.3 – 0.95 | +0.4 / 0 | +0.95 / +0.7 | 0.3 – 1.3 | +0.6 / 0 | +1.3 / +0.9 | ||
| 0.12 – 0.24 | 0.1 – 0.6 | +0.3 / 0 | +0.6 / +0.4 | 0.2 – 1.0 | +0.5 / 0 | +1.0 / +0.7 | not tabulated | 0.4 – 1.2 | +0.5 / 0 | +1.2 / +0.9 | 0.5 – 1.7 | +0.7 / 0 | +1.7 / +1.2 | ||
| 0.24 – 0.40 | 0.1 – 0.75 | +0.4 / 0 | +0.75 / +0.5 | 0.4 – 1.4 | +0.6 / 0 | +1.4 / +1.0 | not tabulated | 0.6 – 1.6 | +0.6 / 0 | +1.6 / +1.2 | 0.5 – 2.0 | +0.9 / 0 | +2.0 / +1.4 | ||
| 0.40 – 0.56 | 0.1 – 0.8 | +0.4 / 0 | +0.8 / +0.5 | 0.5 – 1.6 | +0.7 / 0 | +1.6 / +1.2 | not tabulated | 0.7 – 1.8 | +0.7 / 0 | +1.8 / +1.4 | 0.6 – 2.3 | +1.0 / 0 | +2.3 / +1.6 | ||
| 0.56 – 0.71 | 0.2 – 0.9 | +0.4 / 0 | +0.9 / +0.6 | 0.5 – 1.6 | +0.7 / 0 | +1.6 / +1.2 | not tabulated | 0.7 – 1.8 | +0.7 / 0 | +1.8 / +1.4 | 0.8 – 2.5 | +1.0 / 0 | +2.5 / +1.8 | ||
| 0.71 – 0.95 | 0.2 – 1.1 | +0.5 / 0 | +1.1 / +0.7 | 0.6 – 1.9 | +0.8 / 0 | +1.9 / +1.4 | not tabulated | 0.8 – 2.1 | +0.8 / 0 | +2.1 / +1.6 | 1.0 – 3.0 | +1.2 / 0 | +3.0 / +2.2 | ||
| 0.95 – 1.19 | 0.3 – 1.2 | +0.5 / 0 | +1.2 / +0.8 | 0.6 – 1.9 | +0.8 / 0 | +1.9 / +1.4 | 0.8 – 2.1 | +0.8 / 0 | +2.1 / +1.6 | 1.0 – 2.3 | +0.8 / 0 | +2.3 / +1.8 | 1.3 – 3.3 | +1.2 / 0 | +3.3 / +2.5 |
| 1.19 – 1.58 | 0.3 – 1.3 | +0.6 / 0 | +1.3 / +0.9 | 0.8 – 2.4 | +1.0 / 0 | +2.4 / +1.8 | 1.0 – 2.6 | +1.0 / 0 | +2.6 / +2.0 | 1.5 – 3.1 | +1.0 / 0 | +3.1 / +2.5 | 1.4 – 4.0 | +1.6 / 0 | +4.0 / +3.0 |
| 1.58 – 1.97 | 0.4 – 1.4 | +0.6 / 0 | +1.4 / +1.0 | 0.8 – 2.4 | +1.0 / 0 | +2.4 / +1.8 | 1.2 – 2.8 | +1.0 / 0 | +2.8 / +2.2 | 1.8 – 3.4 | +1.0 / 0 | +3.4 / +2.8 | 2.4 – 5.0 | +1.6 / 0 | +5.0 / +4.0 |
| 1.97 – 2.56 | 0.6 – 1.8 | +0.7 / 0 | +1.8 / +1.3 | 0.8 – 2.7 | +1.2 / 0 | +2.7 / +2.0 | 1.3 – 3.2 | +1.2 / 0 | +3.2 / +2.5 | 2.3 – 4.2 | +1.2 / 0 | +4.2 / +3.5 | 3.2 – 6.2 | +1.8 / 0 | +6.2 / +5.0 |
| 2.56 – 3.15 | 0.7 – 1.9 | +0.7 / 0 | +1.9 / +1.4 | 1.0 – 2.9 | +1.2 / 0 | +2.9 / +2.2 | 1.8 – 3.7 | +1.2 / 0 | +3.7 / +3.0 | 2.8 – 4.7 | +1.2 / 0 | +4.7 / +4.0 | 4.2 – 7.2 | +1.8 / 0 | +7.2 / +6.0 |
| 3.15 – 3.94 | 0.9 – 2.4 | +0.9 / 0 | +2.4 / +1.8 | 1.4 – 3.7 | +1.4 / 0 | +3.7 / +2.8 | 2.1 – 4.4 | +1.4 / 0 | +4.4 / +3.5 | 3.6 – 5.9 | +1.4 / 0 | +5.9 / +5.0 | 4.8 – 8.4 | +2.2 / 0 | +8.4 / +7.0 |
| 3.94 – 4.73 | 1.1 – 2.6 | +0.9 / 0 | +2.6 / +2.0 | 1.6 – 3.9 | +1.4 / 0 | +3.9 / +3.0 | 2.6 – 4.9 | +1.4 / 0 | +4.9 / +4.0 | 4.6 – 6.9 | +1.4 / 0 | +6.9 / +6.0 | 5.8 – 9.4 | +2.2 / 0 | +9.4 / +8.0 |
| 4.73 – 5.52 | 1.2 – 2.9 | +1.0 / 0 | +2.9 / +2.2 | 1.9 – 4.5 | +1.6 / 0 | +4.5 / +3.5 | 3.4 – 6.0 | +1.6 / 0 | +6.0 / +5.0 | 5.4 – 8.0 | +1.6 / 0 | +8.0 / +7.0 | 7.5 – 11.6 | +2.5 / 0 | +11.6 / +10.0 |
| 5.52 – 6.30 | 1.5 – 3.2 | +1.0 / 0 | +3.2 / +2.5 | 2.4 – 5.0 | +1.6 / 0 | +5.0 / +4.0 | 3.4 – 6.0 | +1.6 / 0 | +6.0 / +5.0 | 5.4 – 8.0 | +1.6 / 0 | +8.0 / +7.0 | 9.5 – 13.6 | +2.5 / 0 | +13.6 / +12.0 |
| 6.30 – 7.09 | 1.8 – 3.5 | +1.0 / 0 | +3.5 / +2.8 | 2.9 – 5.5 | +1.6 / 0 | +5.5 / +4.5 | 4.4 – 7.0 | +1.6 / 0 | +7.0 / +6.0 | 6.4 – 9.0 | +1.6 / 0 | +9.0 / +8.0 | 9.5 – 13.6 | +2.5 / 0 | +13.6 / +12.0 |
| 7.09 – 7.88 | 1.8 – 3.8 | +1.2 / 0 | +3.8 / +3.0 | 3.2 – 6.2 | +1.8 / 0 | +6.2 / +5.0 | 5.2 – 8.2 | +1.8 / 0 | +8.2 / +7.0 | 7.2 – 10.2 | +1.8 / 0 | +10.2 / +9.0 | 11.2 – 15.8 | +2.8 / 0 | +15.8 / +14.0 |
| 7.88 – 8.86 | 2.3 – 4.3 | +1.2 / 0 | +4.3 / +3.5 | 3.2 – 6.2 | +1.8 / 0 | +6.2 / +5.0 | 5.2 – 8.2 | +1.8 / 0 | +8.2 / +7.0 | 8.2 – 11.2 | +1.8 / 0 | +11.2 / +10.0 | 13.2 – 17.8 | +2.8 / 0 | +17.8 / +16.0 |
| 8.86 – 9.85 | 2.3 – 4.3 | +1.2 / 0 | +4.3 / +3.5 | 4.2 – 7.2 | +1.8 / 0 | +7.2 / +6.0 | 6.2 – 9.2 | +1.8 / 0 | +9.2 / +8.0 | 10.2 – 13.2 | +1.8 / 0 | +13.2 / +12.0 | 13.2 – 17.8 | +2.8 / 0 | +17.8 / +16.0 |
| 9.85 – 11.03 | 2.8 – 4.9 | +1.2 / 0 | +4.9 / +4.0 | 4.0 – 7.2 | +2.0 / 0 | +7.2 / +6.0 | 7.0 – 10.2 | +2.0 / 0 | +10.2 / +9.0 | 10.0 – 13.2 | +2.0 / 0 | +13.2 / +12.0 | 15.0 – 20.0 | +3.0 / 0 | +20.0 / +18.0 |
| 11.03 – 12.41 | 2.8 – 4.9 | +1.2 / 0 | +4.9 / +4.0 | 5.0 – 8.2 | +2.0 / 0 | +8.2 / +7.0 | 7.0 – 10.2 | +2.0 / 0 | +10.2 / +9.0 | 12.0 – 15.2 | +2.0 / 0 | +15.2 / +14.0 | 17.0 – 22.0 | +3.0 / 0 | +22.0 / +20.0 |
| 12.41 – 13.98 | 3.1 – 5.5 | +1.4 / 0 | +5.5 / +4.5 | 5.8 – 9.4 | +2.2 / 0 | +9.4 / +8.0 | 7.8 – 11.4 | +2.2 / 0 | +11.4 / +10.0 | 13.8 – 17.4 | +2.2 / 0 | +17.4 / +16.0 | 18.5 – 24.2 | +3.5 / 0 | +24.2 / +22.0 |
| 13.98 – 15.75 | 3.6 – 6.1 | +1.4 / 0 | +6.1 / +5.0 | 5.8 – 9.4 | +2.2 / 0 | +9.4 / +8.0 | 9.8 – 13.4 | +2.2 / 0 | +13.4 / +12.0 | 15.8 – 19.4 | +2.2 / 0 | +19.4 / +18.0 | 21.5 – 27.2 | +3.5 / 0 | +27.2 / +25.0 |
| 15.75 – 17.72 | 4.4 – 7.0 | +1.6 / 0 | +7.0 / +6.0 | 6.5 – 10.6 | +2.5 / 0 | +10.6 / +9.0 | 9.5 – 13.6 | +2.5 / 0 | +13.6 / +12.0 | 17.5 – 21.6 | +2.5 / 0 | +21.6 / +20.0 | 24.0 – 30.5 | +4.0 / 0 | +30.5 / +28.0 |
| 17.72 – 19.69 | 4.4 – 7.0 | +1.6 / 0 | +7.0 / +6.0 | 7.5 – 11.6 | +2.5 / 0 | +11.6 / +10.0 | 11.5 – 15.6 | +2.5 / 0 | +15.6 / +14.0 | 19.5 – 23.6 | +2.5 / 0 | +23.6 / +22.0 | 26.0 – 32.5 | +4.0 / 0 | +32.5 / +30.0 |
Worked example: a Ø1.500 in shaft
- RC4 close running (H8/f7): hole +1.6 / 0 → 1.5000 to 1.5016 in; shaft −1.0 / −2.0 → 1.4980 to 1.4990 in; clearance 1.0 to 3.6 thousandths.
- LC2 locational clearance (H7/h6): hole +1.0 / 0, shaft 0 / −0.6; clearance 0 to 1.6 thousandths, the zero-play end of the clearance fits.
- LT3 transition (H7/k6): hole +1.0 / 0, shaft +0.7 / +0.1; from 0.7 thousandths interference to 0.9 thousandths clearance.
- FN2 medium drive (H7/s6): hole +1.0 / 0 → 1.5000 to 1.5010 in; shaft +2.4 / +1.8 → 1.5018 to 1.5024 in; interference 0.8 to 2.4 thousandths.
The hole is the same drill-and-ream target in each case; the fit class moves the shaft. To size the press or check the hub of an FN fit, enter the interference in the press fit calculator (manual mode, 1 thousandth = 25.4 µm). Metric drawings use ISO 286 instead: see the H7 tolerance chart and the ISO 286 fit calculator.
Data & provenance
Values are ANSI B4.1-1967 (R1987), the standard now published as ASME B4.1, as reproduced in Machinery’s Handbook (26th edition, Tables 3 to 9), checked row by row against the independent transcription in the Engineers Edge ANSI B4.1 calculators. Clearance and interference are computed from the limits. Where the two disagreed we kept the value that agrees with the handbook’s own clearance column (six cells in the LC tables). Two limits printed the same way in both were corrected: LT1 at 9.85–12.41 in has shaft limits +0.6 / −0.6 (js6 is symmetric; printed −6.6), and LC6 at 1.97–3.15 in has shaft limits −1.2 / −3.0 (matching the printed 1.2 minimum clearance; printed −1.0). Sizes from 19.69 to 200 in are in the standard but not in this chart. Engineering reference values: check the current ASME B4.1 before releasing production drawings.
FAQ
What is an ANSI fit chart?
It lists the hole and shaft limits of the ANSI B4.1 standard fits for inch sizes. For each fit class and nominal size range it gives the hole tolerance, the shaft tolerance and the resulting minimum and maximum clearance or interference, in thousandths of an inch.
What do RC, LC, LT, LN and FN mean?
RC is running and sliding clearance fits, LC locational clearance fits, LT locational transition fits, LN locational interference fits and FN force or shrink fits. The number after the letters grows with the looseness (RC, LC) or the tightness (FN) of the fit.
What is an FN2 fit?
FN2 is the medium drive fit, H7/s6 in ABC symbols, used for ordinary steel parts and for shrink fits on light sections. At a 1 inch nominal size the hole is +0.8 / 0 and the shaft is +1.9 / +1.4 thousandths, so the interference is 0.6 to 1.9 thousandths of an inch.
How do I read the values?
All values are thousandths of an inch added to the basic size. +0.8 means +0.0008 in. A 1.000 in FN2 hole is 1.0000 to 1.0008 in. A size on a range boundary belongs to the lower range: 1.19 in uses 0.95 to 1.19 for FN and 0.71 to 1.19 for the other classes.
Are ANSI B4.1 fits the same as ISO 286 fits?
No. The H7/s6 style symbols are the ABC equivalents, but ANSI B4.1 tabulates its own inch values, rounded to tenths of a thousandth, and the size ranges differ from the metric ones. For millimetre drawings use ISO 286 (see the H7 tolerance chart and the ISO 286 fit calculator).
What size range does this chart cover?
Nominal sizes from 0 to 19.69 in, the range both of our sources tabulate. The standard continues up to 200 in; for larger sizes use the standard itself.