DIN 103 Trapezoidal Thread Rods (Tr)
DIN 103 trapezoidal thread rod, Tr 10 to Tr 60 — the multi-start-capable Tr profile bar that turns rotation into controlled linear motion, mating with the DIN 103 trapezoidal nuts in the nuts family — with the collected 16-size pitch table.
Last updated: 2026-11
Specifications
DIN 103 defines the trapezoidal (Tr) screw thread — the 30°-included-angle profile that power transmission screws use — and the collected page tabulates the rod side of it: Tr 10 through Tr 60 with the pitch printed for each diameter. Trapezoidal rod is the bar stock of lead screws and adjusting spindles: valve and gate stems, machine-table traverses, presses, mould-set screws and linear actuators, running against a trapezoidal nut (the DIN 103 hex and round nuts on this site are the collected mating parts). Unlike a fastener thread it is judged on running fit and wear, not preload — the flank angle carries load on the flanks so the screw converts torque to axial travel smoothly and resists back-driving better than an acme-style shallow form. The collected table is pitch-only: it prints P for each nominal Tr size from Tr 10 (P 3) to Tr 60 (P 9) and stops there — multi-start options, diameter tolerances, thread-fit classes, lengths and materials are not printed by the collected specification and stay per RFQ. For the mating nuts see the DIN 103 trapezoidal hex nut and round nut pages in the nuts family.
| Standard | DIN 103 — trapezoidal (Tr) screw thread, 30° included flank angle, ISO-metric-derived diameter/pitch series |
|---|---|
| Series | Tr 10 – Tr 60 (16 nominal sizes tabulated: Tr 10/12/14/16/18/20/22/24/26/28/30/36/40/44/50/60) |
| Tabulated data | Pitch P per nominal diameter — Tr 10/12: 3 mm; Tr 14–20: 3–4 mm; Tr 22–30: 5–6 mm; Tr 36–60: 6–9 mm (full table below) |
| Function | Lead-screw bar stock converting torque to linear travel; mates with DIN 103 trapezoidal nuts |
| Starts, fit class, length | Not tabulated by the collected specification — per RFQ |
| Materials | Not tabulated by the collected specification — per RFQ (steel bar, machined or rolled thread) |
| Size | P — Thread Pitch |
|---|---|
| Tr 10 | 3 |
| Tr 12 | 3 |
| Tr 14 | 4 |
| Tr 16 | 4 |
| Tr 18 | 4 |
| Tr 20 | 4 |
| Tr 22 | 5 |
| Tr 24 | 5 |
| Tr 26 | 5 |
| Tr 28 | 5 |
| Tr 30 | 6 |
| Tr 36 | 6 |
| Tr 40 | 7 |
| Tr 44 | 7 |
| Tr 50 | 8 |
| Tr 60 | 9 |
Materials
- Material and thread form (machined or rolled) specified per RFQ — confirm running-fit class at quotation
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 103 Trapezoidal Thread Rods (Tr)) 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 quantity is 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 days. Quantities or variants outside the standard range are confirmed at 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
How do I pick the Tr size and pitch for a lead screw?
Work from the load and the travel ratio. The pitch sets how far the nut moves per revolution — a Tr 14 × 4 advances twice as fast as a Tr 14 × 3 — so your motor or handwheel speed and the required travel fix the pitch first, then the nominal diameter is sized on the flank (and core) area against the axial load with the trapezoidal form's low efficiency in mind: these screws hold position well precisely because they do not back-drive easily, but that friction is lost motion under load. The collected table prints the standard diameter/pitch pairings from Tr 10 upward — larger diameters pair with coarser pitches, which is the wear- and strength-driven series. Confirm the mating nut (hex for through-supports, round for flanged or machined-in housings), state the fit class and starts at RFQ, and remember the thread is running, not clamped: specify lubrication and expected duty cycle.
What is the MOQ and lead time for this bolt type?
The minimum order quantity is 1,000–10,000 pieces depending on size. Stock items ship in 3–7 days; high-strength and custom parts in 15–25 days. Common diameters in this bolt type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- What Bolt Property Classes 8.8, 10.9 and 12.9 Encode — and When High Strength Stops Being the Right Choice
- Bolt Grade Selection: ISO 898-1 8.8/10.9/12.9 vs ASTM A307 and A325
- 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
- Calculating Bolt Preload and Clamp Force: Torque, Friction and Tightening Method
- How to Determine Tightening Torque and Choose a Tightening Method for a Bolted Joint
- Fastener Failure Modes: Which Fatigue, Creep and SCC Controls the Evidence Supports
- Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ
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