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Dormer Pramet A125 3/8 Inch x 310 mm HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILL BS 328
SKU:DOR-A1253/8X315
Meet the Dormer Pramet A125 3/8 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built twist drill crafted for deep-hole precision in metalworking. With its extended ...
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Material Compatibility
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Specification
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| Type | Extra Long Series |
| Drill Diameter | 3/8 |
| Flute Length | 250 |
| Overall Length | 310 |
| Shank Diameter | 9.52 |
| Substrate | HSS |
£42.59
Prices shown ex. VAT
2 days estimated lead time
— subject to availability
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Free delivery over £50 ex VAT
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30+ years expertise
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Meet the Dormer Pramet A125 3/8 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built twist drill crafted for deep-hole precision in metalworking. With its extended reach, this bit is ready for the toughest depths while maintaining true alignment in every cut.
- 118° conventional point — delivers a strong, self-centering start that resists wandering and remains easy to re-sharpen in the field.
- Steam oxide finish — helps reduce built-up edge and prevents workpiece material from sticking to the cutting edge, promoting smoother holes and longer edge life.
- Extra-long length (310 mm) — ideal for drilling very deep holes or accessing tight areas, reducing the need to swap to multiple tools for extended reach.
- Premium HSS material — high-speed steel built for durability and heat resistance, capable of drilling through steel, aluminum, and stainless steel with reliable performance.
- Straight shank — compatible with a wide range of drill chucks and machine tools, delivering stable, true alignment and minimal runout.
- BS 328 compliant — designed to meet professional standards for dependable, repeatable results in demanding applications.
Versatile in practice, this drill shines in a variety of scenarios:
- Fabrication and construction tasks that require deep drilling into steel frameworks, brackets, and gussets.
- Automotive and machinery assembly where long reach and consistent hole quality are crucial.
- Machining aluminum or stainless steel components where clean chip formation and edge life matter.
Practical tips for maximum performance:
- Choose the right speed: moderate speeds for steel, slightly higher for aluminum, and use suitable cutting fluid to extend tool life.
- Use measured pecking to clear chips when drilling deep holes, reducing heat buildup and improving hole finish.
- Inspect the tip regularly and re-sharpen as needed to maintain the precise 118° starting point for accurate starts.
The Dormer Pramet A125 3/8 in x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 is a dependable choice for professionals who need depth, rigidity, and consistent performance in demanding drilling tasks. The brand’s logo image below underscores its heritage of quality in metalworking tools.
| Type | Extra Long Series |
| Drill Diameter | 3/8 |
| Flute Length | 250 |
| Overall Length | 310 |
| Shank Diameter | 9.52 |
| Substrate | HSS |
| Coated | Steam Tempered |
What time are Protool open?
We are open Monday to Friday between 8:30am and 5pm.
Do you offer Free Next Day delivery?
Yes! We offer Free Next Day delivery via Royal Mail Tracked 24 on all orders over £50 ex VAT*. We also offer Free DPD Local Next Day delivery on all orders over £100 ex VAT*.
We also offer the following:
- Royal Mail Tracked 24 — £5.90 (FREE on orders over £50 ex VAT*). Order before 4:30pm for next day delivery. No signature required.
- DPD Local Next Day — £8.00 (FREE on orders over £100 ex VAT*). Standard next day delivery to UK mainland addresses.
- Royal Mail Special Delivery — £12.50. Guaranteed delivery before 1pm the next working day.
- DPD Saturday Delivery — £25.00. Must be ordered on Friday before 4pm. Pre-12pm delivery.
For delivery to Scottish Highlands & Islands, Northern Ireland, Republic of Ireland, or overseas locations, additional charges apply. Please see our delivery page for full details, or call us on 01732 887 334.
*T's & C's and exclusions apply. Please see our delivery page for more information on all our services.
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Full Range: Dormer Pramet A125 HSS ST STRAIGHT SHANK EXTRA LONG SERIES DRILLS BS 328
View full collection →You are viewing DOR-A1253/8X315. Click any other SKU to view its full details.
| Product SKU | Drill Diameter | Flute Length | Overall Length | Shank Diameter | Price | Stock | Order |
|---|---|---|---|---|---|---|---|
| DOR-A1251.4X160 | 1.40 | 100 | 160 | 1.4 | £18.83 | 2 days | |
| DOR-A1251.5X125 | 1.50 | 80 | 125 | 1.5 | £10.72 | 2 days | |
| DOR-A1251.5X160 | 1.50 | 100 | 160 | 1.5 | £12.72 | 2 days | |
| DOR-A1251/16X125 | 1/16 | 80 | 125 | 1.59 | £13.07 | 2 days | |
| DOR-A1251/16X160 | 1/16 | 100 | 160 | 1.59 | £15.64 | 2 days | |
| DOR-A1251.8X160 | 1.80 | 100 | 160 | 1.8 | £16.45 | 2 days | |
| DOR-A1255/64X160 | 5/64 | 100 | 160 | 1.98 | £16.14 | 2 days | |
| DOR-A1255/64X125 | 5/64 | 80 | 125 | 1.98 | £15.49 | 2 days | |
| DOR-A1252.0X125 | 2.00 | 80 | 125 | 2 | £8.30 | 2 days | |
| DOR-A1252.0X160 | 2.00 | 100 | 160 | 2 | £9.76 | 2 days | |
| DOR-A1252.2X160 | 2.20 | 100 | 160 | 2.2 | £10.11 | 2 days | |
| DOR-A1253/32X160 | 3/32 | 100 | 160 | 2.38 | £9.79 | 2 days | |
| DOR-A1253/32X125 | 3/32 | 80 | 125 | 2.38 | £8.94 | 2 days | |
| DOR-A1252.5X125 | 2.50 | 80 | 125 | 2.5 | £7.84 | 2 days | |
| DOR-A1252.5X160 | 2.50 | 100 | 160 | 2.5 | £9.65 | 2 days | |
| DOR-A1257/64X125 | 7/64 | 80 | 125 | 2.78 | £9.47 | 2 days | |
| DOR-A1257/64X160 | 7/64 | 100 | 160 | 2.78 | £14.50 | 2 days | |
| DOR-A1253.0X160 | 3.00 | 100 | 160 | 3 | £9.17 | 2 days | |
| DOR-A1253.0X200 | 3.00 | 150 | 200 | 3 | £12.25 | 2 days | |
| DOR-A1253.0X250 | 3.00 | 200 | 250 | 3 | £15.53 | 2 days | |
| DOR-A1251/8X160 | 1/8 | 100 | 160 | 3.18 | £11.26 | 2 days | |
| DOR-A1251/8X200 | 1/8 | 150 | 200 | 3.18 | £11.45 | 2 days | |
| DOR-A1251/8X250 | 1/8 | 200 | 250 | 3.18 | £22.28 | 2 days | |
| DOR-A1251/8X315 | 1/8 | 250 | 310 | 3.18 | £25.63 | 2 days | |
| DOR-A1253.3X160 | 3.30 | 100 | 160 | 3.3 | £13.22 | 2 days | |
| DOR-A1253.5X160 | 3.50 | 100 | 160 | 3.5 | £9.30 | 2 days | |
| DOR-A1253.5X200 | 3.50 | 150 | 200 | 3.5 | £11.48 | 2 days | |
| DOR-A1253.5X250 | 3.50 | 200 | 250 | 3.5 | £16.17 | 2 days | |
| DOR-A1259/64X160 | 9/64 | 100 | 160 | 3.57 | £16.32 | 2 days | |
| DOR-A1259/64X200 | 9/64 | 150 | 200 | 3.57 | £16.42 | 2 days | |
| DOR-A1259/64X315 | 9/64 | 250 | 310 | 3.57 | £23.76 | 2 days | |
| DOR-A1255/32X160 | 5/32 | 100 | 160 | 3.97 | £11.43 | 2 days | |
| DOR-A1255/32X200 | 5/32 | 150 | 200 | 3.97 | £13.53 | 2 days | |
| DOR-A1255/32X250 | 5/32 | 200 | 250 | 3.97 | £26.08 | 2 days | |
| DOR-A1255/32X315 | 5/32 | 250 | 310 | 3.97 | £33.11 | 2 days | |
| DOR-A1254.0X160 | 4.00 | 100 | 160 | 4 | £9.33 | 2 days | |
| DOR-A1254.0X200 | 4.00 | 150 | 200 | 4 | £12.04 | 2 days | |
| DOR-A1254.0X250 | 4.00 | 200 | 250 | 4 | £16.13 | 2 days | |
| DOR-A1254.0X315 | 4.00 | 250 | 310 | 4 | £20.00 | 2 days | |
| DOR-A12511/64X160 | 11/64 | 100 | 160 | 4.37 | £15.03 | 2 days | |
| DOR-A12511/64X200 | 11/64 | 150 | 200 | 4.37 | £18.10 | 2 days | |
| DOR-A12511/64X315 | 11/64 | 250 | 310 | 4.37 | £26.08 | 2 days | |
| DOR-A1254.5X160 | 4.50 | 100 | 160 | 4.5 | £10.84 | 2 days | |
| DOR-A1254.5X200 | 4.50 | 150 | 200 | 4.5 | £14.21 | 2 days | |
| DOR-A1254.5X250 | 4.50 | 200 | 250 | 4.5 | £21.78 | 2 days | |
| DOR-A1254.5X315 | 4.50 | 250 | 310 | 4.5 | £23.80 | 2 days | |
| DOR-A1253/16X160 | 3/16 | 100 | 160 | 4.76 | £10.99 | 2 days | |
| DOR-A1253/16X200 | 3/16 | 150 | 200 | 4.76 | £12.52 | 2 days | |
| DOR-A1253/16X250 | 3/16 | 200 | 250 | 4.76 | £15.94 | 2 days | |
| DOR-A1253/16X315 | 3/16 | 250 | 310 | 4.76 | £23.30 | 2 days | |
| DOR-A1253/16X400 | 3/16 | 300 | 400 | 4.76 | £44.05 | 2 days | |
| DOR-A1255.0X160 | 5.00 | 100 | 160 | 5 | £10.53 | 2 days | |
| DOR-A1255.0X200 | 5.00 | 150 | 200 | 5 | £13.86 | 2 days | |
| DOR-A1255.0X250 | 5.00 | 200 | 250 | 5 | £17.24 | 2 days | |
| DOR-A1255.0X315 | 5.00 | 250 | 310 | 5 | £23.89 | 2 days | |
| DOR-A1255.0X400 | 5.00 | 300 | 400 | 5 | £30.42 | 2 days | |
| DOR-A12513/64X200 | 13/64 | 150 | 200 | 5.16 | £21.57 | 2 days | |
| DOR-A12513/64X250 | 13/64 | 200 | 250 | 5.16 | £27.95 | 2 days | |
| DOR-A12513/64X315 | 13/64 | 250 | 310 | 5.16 | £36.71 | 2 days | |
| DOR-A1255.5X200 | 5.50 | 150 | 200 | 5.5 | £12.84 | 2 days | |
| DOR-A1255.5X250 | 5.50 | 200 | 250 | 5.5 | £20.75 | 2 days | |
| DOR-A1255.5X315 | 5.50 | 250 | 310 | 5.5 | £32.83 | 2 days | |
| DOR-A1257/32X200 | 7/32 | 150 | 200 | 5.56 | £16.69 | 2 days | |
| DOR-A1257/32X250 | 7/32 | 200 | 250 | 5.56 | £21.33 | 2 days | |
| DOR-A12515/64X200 | 15/64 | 150 | 200 | 5.95 | £25.86 | 2 days | |
| DOR-A12515/64X315 | 15/64 | 250 | 310 | 5.95 | £24.81 | 2 days | |
| DOR-A1256.0X200 | 6.00 | 150 | 200 | 6 | £14.91 | 2 days | |
| DOR-A1256.0X250 | 6.00 | 200 | 250 | 6 | £19.96 | 2 days | |
| DOR-A1256.0X315 | 6.00 | 250 | 310 | 6 | £24.85 | 2 days | |
| DOR-A1256.0X400 | 6.00 | 300 | 400 | 6 | £36.16 | 2 days | |
| DOR-A1251/4X200 | 1/4 | 150 | 200 | 6.35 | £16.32 | 2 days | |
| DOR-A1251/4X250 | 1/4 | 200 | 250 | 6.35 | £20.69 | 2 days | |
| DOR-A1251/4X315 | 1/4 | 250 | 310 | 6.35 | £25.63 | 2 days | |
| DOR-A1251/4X400 | 1/4 | 300 | 400 | 6.35 | £52.44 | 2 days | |
| DOR-A1251/4X500 | 1/4 | 400 | 460 | 6.35 | £72.96 | 2 days | |
| DOR-A1256.5X200 | 6.50 | 150 | 200 | 6.5 | £17.10 | 2 days | |
| DOR-A1256.5X250 | 6.50 | 200 | 250 | 6.5 | £21.20 | 2 days | |
| DOR-A1256.5X315 | 6.50 | 250 | 310 | 6.5 | £30.64 | 2 days | |
| DOR-A12517/64X200 | 17/64 | 150 | 200 | 6.75 | £21.11 | 2 days | |
| DOR-A12517/64X250 | 17/64 | 200 | 250 | 6.75 | £28.41 | 2 days | |
| DOR-A12517/64X500 | 17/64 | 400 | 460 | 6.75 | £72.96 | 2 days | |
| DOR-A1257.0X200 | 7.00 | 150 | 200 | 7 | £18.45 | 2 days | |
| DOR-A1257.0X250 | 7.00 | 200 | 250 | 7 | £23.58 | 2 days | |
| DOR-A1257.0X315 | 7.00 | 250 | 310 | 7 | £33.24 | 2 days | |
| DOR-A1257.5X200 | 7.50 | 150 | 200 | 7.5 | £22.12 | 2 days | |
| DOR-A1257.5X250 | 7.50 | 200 | 250 | 7.5 | £26.68 | 2 days | |
| DOR-A1257.5X315 | 7.50 | 250 | 310 | 7.5 | £34.56 | 2 days | |
| DOR-A1255/16X200 | 5/16 | 150 | 200 | 7.94 | £20.93 | 2 days | |
| DOR-A1255/16X250 | 5/16 | 200 | 250 | 7.94 | £26.36 | 2 days | |
| DOR-A1255/16X315 | 5/16 | 250 | 310 | 7.94 | £34.88 | 2 days | |
| DOR-A1255/16X500 | 5/16 | 400 | 460 | 7.94 | £86.18 | 2 days | |
| DOR-A1258.0X250 | 8.00 | 200 | 250 | 8 | £26.04 | 2 days | |
| DOR-A1258.0X315 | 8.00 | 250 | 310 | 8 | £35.07 | 2 days | |
| DOR-A1258.0X400 | 8.00 | 300 | 400 | 8 | £44.23 | 2 days | |
| DOR-A12521/64X315 | 21/64 | 250 | 310 | 8.33 | £64.30 | 2 days | |
| DOR-A1258.5X250 | 8.50 | 200 | 250 | 8.5 | £35.66 | 2 days | |
| DOR-A1258.5X315 | 8.50 | 250 | 310 | 8.5 | £47.88 | 2 days | |
| DOR-A12511/32X250 | 11/32 | 200 | 250 | 8.73 | £34.06 | 2 days | |
| DOR-A12511/32X315 | 11/32 | 250 | 310 | 8.73 | £58.37 | 2 days | |
| DOR-A12511/32X400 | 11/32 | 300 | 400 | 8.73 | £72.05 | 2 days | |
| DOR-A12511/32X500 | 11/32 | 400 | 460 | 8.73 | £86.18 | 2 days | |
| DOR-A1259.0X250 | 9.00 | 200 | 250 | 9 | £30.87 | 2 days | |
| DOR-A1259.0X315 | 9.00 | 250 | 310 | 9 | £39.31 | 2 days | |
| DOR-A1259.0X400 | 9.00 | 300 | 400 | 9 | £56.54 | 2 days | |
| DOR-A1259.5X250 | 9.50 | 200 | 250 | 9.5 | £36.98 | 2 days | |
| DOR-A1259.5X315 | 9.50 | 250 | 310 | 9.5 | £49.70 | 2 days | |
| DOR-A1253/8X250 | 3/8 | 200 | 250 | 9.52 | £33.61 | 2 days | |
| DOR-A1253/8X315 Viewing | 3/8 | 250 | 310 | 9.52 | £42.59 | 2 days | |
| DOR-A1253/8X400 | 3/8 | 300 | 400 | 9.52 | £53.81 | 2 days | |
| DOR-A1253/8X500 | 3/8 | 400 | 460 | 9.52 | £74.33 | 2 days | |
| DOR-A12510.0X250 | 10.00 | 200 | 250 | 10 | £35.52 | 2 days | |
| DOR-A12510.0X315 | 10.00 | 250 | 310 | 10 | £44.19 | 2 days | |
| DOR-A12510.0X400 | 10.00 | 300 | 400 | 10 | £65.21 | 2 days | |
| DOR-A12513/32X250 | 13/32 | 200 | 250 | 10.32 | £44.32 | 2 days | |
| DOR-A12513/32X315 | 13/32 | 250 | 310 | 10.32 | £54.72 | 2 days | |
| DOR-A12510.5X250 | 10.50 | 200 | 250 | 10.5 | £44.28 | 2 days | |
| DOR-A12510.5X315 | 10.50 | 250 | 310 | 10.5 | £57.46 | 2 days | |
| DOR-A12510.5X400 | 10.50 | 300 | 400 | 10.5 | £68.86 | 2 days | |
| DOR-A12511.0X250 | 11.00 | 200 | 250 | 11 | £40.04 | 2 days | |
| DOR-A12511.0X315 | 11.00 | 250 | 310 | 11 | £51.07 | 2 days | |
| DOR-A12511.0X400 | 11.00 | 300 | 400 | 11 | £63.38 | 2 days | |
| DOR-A1257/16X250 | 7/16 | 200 | 250 | 11.11 | £49.25 | 2 days | |
| DOR-A1257/16X315 | 7/16 | 250 | 310 | 11.11 | £62.02 | 2 days | |
| DOR-A1257/16X400 | 7/16 | 300 | 400 | 11.11 | £129.05 | 2 days | |
| DOR-A12529/64X315 | 29/64 | 250 | 310 | 11.51 | £57.46 | 2 days | |
| DOR-A12512.0X250 | 12.00 | 200 | 250 | 12 | £46.97 | 2 days | |
| DOR-A12512.0X315 | 12.00 | 250 | 310 | 12 | £54.72 | 2 days | |
| DOR-A12512.0X400 | 12.00 | 300 | 400 | 12 | £73.42 | 2 days | |
| DOR-A12531/64X315 | 31/64 | 250 | 310 | 12.3 | £57.46 | 2 days | |
| DOR-A1251/2X250 | 1/2 | 200 | 250 | 12.7 | £57.00 | 2 days | |
| DOR-A1251/2X315 | 1/2 | 250 | 310 | 12.7 | £72.96 | 2 days | |
| DOR-A1251/2X400 | 1/2 | 300 | 400 | 12.7 | £95.76 | 2 days | |
| DOR-A12513.0X315 | 13.00 | 250 | 310 | 13 | £58.37 | 2 days | |
| DOR-A12513.0X400 | 13.00 | 300 | 400 | 13 | £74.33 | 2 days | |
| DOR-A12517/32X315 | 17/32 | 250 | 310 | 13.49 | £58.37 | 2 days | |
| DOR-A12514.0X315 | 14.00 | 250 | 310 | 14 | £69.31 | 2 days | |
| DOR-A12514.0X400 | 14.00 | 300 | 400 | 14 | £81.17 | 2 days | |
| DOR-A1259/16X315 | 9/16 | 250 | 310 | 14.29 | £69.31 | 2 days | |
| DOR-A12537/64X315 | 37/64 | 250 | 310 | 14.68 | £69.31 | 2 days | |
| DOR-A12519/32X315 | 19/32 | 250 | 310 | 15.08 | £69.31 | 2 days | |
| DOR-A12519/32X500 | 19/32 | 400 | 460 | 15.08 | £93.02 | 2 days | |
| DOR-A1255/8X315 | 5/8 | 250 | 310 | 15.88 | £69.31 | 2 days | |
| DOR-A1255/8X500 | 5/8 | 400 | 460 | 15.88 | £93.02 | 2 days | |
| DOR-A12511/16X315 | 11/16 | 250 | 310 | 17.46 | £69.31 | 2 days | |
| DOR-A1253/4X315 | 3/4 | 250 | 310 | 19.05 | £70.68 | 2 days | |
| DOR-A1253/4X500 | 3/4 | 400 | 460 | 19.05 | £95.30 | 2 days |
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