DIN 7 / ISO 2338 Parallel Dowel Pins
Parallel dowel pins per DIN 7 / ISO 2338 — solid cylindrical pins with chamfered ends, d m6 nominal series 1–20 mm, tolerance classes m6 and h6, steel property classes 4.6–12.9 and stainless A1/A2/A4 to ISO 3506. The friction-fit locating pin for aligned, rigid joints.
Last updated: 2026-11
Specifications
A parallel dowel pin is a solid cylindrical pin with chamfered ends used to locate and join parts by friction: the pin presses into pre-drilled holes and holds alignment through the frictional fit between pin and material, so the joint stays rigid and the assembled parts stay aligned. DIN 7 is the German standard for these pins and its ISO equivalent is ISO 2338. The collected specification table runs the nominal diameter series d m6 from 1 to 20 mm (1, 1.2, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 20), each with its matching chamfer values r (1.0–20.0) and c (0.15–3.00). Dowel pins are ordered by tolerance class as well as size — m6 for press fits, h6 for clearance fits — and the collected sheet carries band ladders for both classes across the length ranges. Where the joint must come apart repeatedly or carry shock loads, a slotted spring pin (DIN 1481 / ISO 8752) is the complementary choice; where alignment must never slip, the solid dowel pin is.
| Standard | DIN 7 — ISO equivalent ISO 2338 (parallel dowel pins) |
|---|---|
| Nominal diameter series (d, m6) | 1, 1.2, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 20 mm |
| Chamfer r (by diameter) | 1.0, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0, 20.0 mm |
| Chamfer c (by diameter) | 0.15, 0.18, 0.23, 0.30, 0.40, 0.45, 0.60, 0.75, 0.90, 1.20, 1.50, 1.80, 2.50, 3.00 mm |
| Tolerance classes | m6 and h6, with band ladders by diameter across length ranges (l = 2–10 mm and l = 12–32 mm in the collected table); state the class your drawing names — m6 press fit, h6 clearance fit |
| Steel property classes | 4.6, 4.8, 5.8, 6.8 (low or medium carbon steel); 8.8, 9.8 (medium carbon steel, quenched and tempered, tempering min 425 °C); 10.9 (medium carbon with additives, e.g. boron, Mn, Cr, or alloy steel, tempered min 425 °C); 12.9 (alloy steel, quenched and tempered, tempering min 380 °C) |
| Steel chemistry limits | 4.6–6.8: C max 0.55 %, P max 0.05 %, S max 0.06 %; 8.8/9.8: C 0.25–0.55 %, P max 0.04 %, S max 0.05 %; 10.9: C 0.20–0.55 %, P max 0.04 %, S max 0.05 %; 12.9: C 0.20–0.50 %, P max 0.035 %, S max 0.035 % |
| Stainless strength (ISO 3506) | Austenitic A1, A2 and A4 in strength classes 50 / 70 / 80 → tensile strength 500 / 700 / 800 N/mm² (70,000 / 100,000 / 118,000 PSI); diameter range ≤ M39 for class 50, ≤ M20 for classes 70 and 80 (per DIN EN ISO 3506) |
| MOQ / lead time | Not owner-confirmed for this family — confirmed at quotation |
Materials
- Steel: property classes 4.6, 4.8, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9
- Stainless A1 (grade 303, 1.4305)
- Stainless A2 (grade 304: 1.4301, 1.4306, 1.4303)
- Stainless A4 (grade 316: 1.4401, 1.4404)
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (DIN 7 / ISO 2338 Parallel Dowel Pins) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantities and lead times for this family are confirmed at quotation — send your sizes, grades and quantities on the RFQ and the quote will carry a firm schedule. Sample availability is confirmed with the quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
Dowel pin or slotted spring pin — which do I need?
A parallel dowel pin (DIN 7 / ISO 2338) is a solid pin that locates by friction fit in pre-drilled holes — the rigid choice where parts must stay precisely aligned and the joint is not meant to flex. A slotted spring pin (DIN 1481 / ISO 8752) is hollow and split along its full length: it compresses to enter the hole and springs outward against the hole wall, which holds the joint against shock and vibration. If your drawing names the standard, quote against that; if it names only "pin" and the hole size, say so on the RFQ and confirm the type before ordering.
What is the difference between m6 and h6 tolerance on DIN 7 pins?
Both are diameter tolerance classes for the pin; m6 leaves interference (press fit) with a matched hole, h6 leaves clearance. The collected specification sheet carries band ladders for both classes across the length ranges. Match the class to the drawing; where the drawing is silent, the fit intent (press vs removable) decides — confirm before ordering rather than defaulting.
What should an RFQ for these pins state?
State the pin type (parallel dowel pin or slotted spring pin), the standard designation (DIN 7 / ISO 2338 or DIN 1481 / ISO 8752), nominal diameter and length, tolerance class where the drawing names one (m6 or h6 for dowel pins), material (steel property class or stainless grade), and quantity per size — plus destination country. Commercial terms are confirmed at quotation.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support