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BS1804 Extractable Dowel Pins

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Hardened & Ground Extractable Dowels produced in line with BS1804 are offered in both inch and metric sizes to a precise interference fit.

Metric sizes are produced to BS1804 Part 3 Type B with an air release flat as standard. Inch sizes are offered across the range with a diameter tolerance of +0.0001"" to +0.0003"". We do not automatically apply a provision for air release flats on inch sizes, this needs to be requested at the point of enquiry.

Our metric size range is from 3mm up to 25mm diameter and are produced to an interference fit ‘m6’ tolerance band which is explained more clearly in the chart below.

Diameter Range Tolerance Band
From 3 to 6mm +0.004 / +0.012mm
From 6 to 10mm +0.006 / +0.015mm
From 10 to 18mm +0.007 / +0.018mm
From 18 to 30mm +0.008 / +0.021mm

The standard tapping specifcations for Extractable Dowels to BS1804 Part 3 Type B as follows:

 Diameter  Internal Thread
3mm M2 x 3.5 deep
4mm M2.5 x 4 deep
5mm M3 x 5 deep
6mm M4 x 6 deep
8mm M5 x 8 deep
10mm M6 x 10 deep
12mm M8 x 12 deep
16mm M10 x 16 deep
20mm M12 x 18 deep
25mm M16 x 24 deep

Our standard inch size range is from 1/4"" up to 3/4"" diameter and our preferred material is Case Hardened Mild Steel.

The chart below indicates the standard tapping range for inch Extractable Dowels.

Diameter Internal Thread
1/4"" 4BA x 1/4"" deep
5/16"" 3BA x 1/4"" deep
3/8"" 2BA x 5/16"" deep
1/2"" 1/4BSF x 3/8"" deep
5/8"" 1/4BSF x 3/8"" deep
3/4"" 1/4BSF x 3/8"" deep

Our preferred material for Metric Extractable Dowels has more recently moved towards a Through Hardened Alloy 1.3505 (100Cr6) hardened to HRC58-64 rather than Case Hardened Mild Steel simply due to customer demand.

If you require alternative tapping sizes please refer to our specification series T05 & D05.

Sizes outside of this range can be produced to order, please enquire.

Product Standard descriptionDowel, Extractable, BS1804
Pinco Part NumberA05
British (BS)1804 Part 3 Type B
DIN7977 & 258
Standard Stock rangeBS 1804 Part 3 Type B

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