ISO 8734 Parallel pins of hardened steel and martensitic stainless steel (Dowel pins)
Dimensions of Parallel pins of hardened steel and martensitic stainless steel (Dowel pins)
Dimensions in Millimetres
| d m61 | 1 | 1.5 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| c = | 0.2 | 0.3 | 0.35 | 0.4 | 0.5 | 0.63 | 0.8 | 1.2 | 1.6 | 2 | 2.5 | 3 | 3.5 | |||||||||
| l2) | ||||||||||||||||||||||
| nom. | min. | max. | ||||||||||||||||||||
| 3 | 2.75 | 3.25 | ||||||||||||||||||||
| 4 | 3.75 | 4.25 | ||||||||||||||||||||
| 5 | 4.75 | 5.25 | ||||||||||||||||||||
| 6 | 5.75 | 6.25 | ||||||||||||||||||||
| 8 | 7.75 | 8.25 | ||||||||||||||||||||
| 10 | 9.75 | 10.25 | ||||||||||||||||||||
| 12 | 11.5 | 12.5 | ||||||||||||||||||||
| 14 | 13.5 | 14.5 | ||||||||||||||||||||
| 16 | 15.5 | 16.5 | ||||||||||||||||||||
| 20 | 19.5 | 20.5 | Range | |||||||||||||||||||
| 22 | 21.5 | 22.5 | ||||||||||||||||||||
| 24 | 23.5 | 24.5 | of | |||||||||||||||||||
| 26 | 25.5 | 26.5 | ||||||||||||||||||||
| 28 | 27.5 | 28.5 | ||||||||||||||||||||
| 30 | 29.5 | 30.5 | ||||||||||||||||||||
| 32 | 31.5 | 32.5 | commerical | |||||||||||||||||||
| 35 | 34.5 | 35.5 | ||||||||||||||||||||
| 40 | 39.5 | 40.5 | ||||||||||||||||||||
| 45 | 44.5 | 45.5 | lengths | |||||||||||||||||||
| 50 | 49.5 | 50.5 | ||||||||||||||||||||
| 55 | 54.25 | 55.75 | ||||||||||||||||||||
| 60 | 59.25 | 60.75 | ||||||||||||||||||||
| 65 | 64.25 | 65.75 | ||||||||||||||||||||
| 70 | 69.25 | 70.75 | ||||||||||||||||||||
| 75 | 74.25 | 75.75 | ||||||||||||||||||||
| 80 | 79.25 | 80.75 | ||||||||||||||||||||
| 85 | 84.25 | 85.75 | ||||||||||||||||||||
| 90 | 89.25 | 90.75 | ||||||||||||||||||||
| 95 | 94.25 | 95.75 | ||||||||||||||||||||
| 100 | 99.25 | 100.75 | ||||||||||||||||||||
|
1) Other tolerance as agreed between customer and supplier 2) For nominal lengths above 100 mm, steps of 20 mm. |
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Requirements and referenc International Standards
| Material1) | Steel | Martensitic stainless steel | |||
| St | C1 in accordance with ISO 3506-1 | ||||
| Type A pin through hardened |
Type B pin case hardened |
hardened and tempered to a hardness of 460 HV30 to 560 HV30 |
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| Chemical compostin limits (check analysis) % |
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|
C 0.95 to 1.1 Si 0.15 to 0.35 Mn 0.25 to 0.4 P 0.03 max. S 0.025 max. Cr 1.35 to 1.65 |
either C 0.06 to 0.13 Si 0.1 to 0.4 Mn 0.25 to 0.6 P 0.025 max. S 0.05 max. |
or C 0.15 max. Si 0.10 max. Mn 0.9 to 1.3 P 0.07 max. S 0.15 to 0.35 Pb 0.15 to 0.35 |
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| Hardness: 550 HV30 to 650 HV30 |
at the supplier's discretion Surface hardness: 600 HV1 to 700 HV1 Hardness at case depth 0.25 to 0.4 mm: 550 HV1 min. |
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| Surface | Plain, i.e. pins to be supplied in natural finish, treated with a
protective lubricant, unless otherwise specified by agreement between customer and supplier. |
Plain, i.e. pins to be supplied in natural finish |
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| If pins are surface coated appropriate plating or coating processes
should be employed to avoid hydrogen emberittlement. When pins are electro- plated or phospate-coated, they shall be suitably treated immediately after plating or coatings to obviate detrimental hydrogen emberittlement, although freedom from hyfrogen emberittlement ist not absolutely guaran- teed (See ISO 4042.) All tolerance shall apply prior to the application of a plating or coatings. |
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| Surface roughness |
Ra ≤ 0.8 µm | ||||
| Workmanship | Pins shall be free of irregularities or detrimental defects. No burrs shall appear on any part of the pin. |
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| Acceptability | The Acceptance procedure is covered in ISO 3269. | ||||
Designation
Example 1.
A through hardened steel parallel pin type A, with nominal diameter d = 6 mm and nominal length l = 30 mm
is
designated as follow:
Parallel pin ISO 8734 - 6 x 30 - A - St
Example 2
A Martensitic stainless steel parallel pin of grade C1, with nominal diameter d = 6 mm and nominal length
l = 30 mm is designated as follow:
Parallel pin ISO 8734 - 6 x 30 - C1