DIN 7977 Taper Pins with External Thread
DIN 7977 taper pins with external thread (ISO 8737), nominal d 5–20 mm — the taper pin with a male stud thread cut directly onto the large end, for assemblies released by nut rather than drift, with the collected b/d2 ladder per size.
Last updated: 2026-11
Specifications
DIN 7977 is the taper pin whose large end is cut with a male stud thread — no separate shoulder ladder like DIN 258, just the taper series d = 5 to 20 mm each ending in a thread: M 5 at the 5 mm pin stepping up to M 16 at 16 and 20 mm, with the thread length b running 14 mm at the small end of the series to 35 mm at the large. The source cross-references ISO 8737, the internationally maintained successor designation, so a drawing marked either number seats on this ladder. Assembly logic is the plain taper pin's up to the release: ream the seat to the nominal taper, fit by depth and hand pressure, then use the stud thread with a nut (or a threaded puller) instead of a drift for removal — the reason this series exists is assemblies where a drift blow is unacceptable. Pick the size off the drawing's nominal d; the collected table then fixes b and the thread designation per size. Where the drawing wants the pin nutted against a machined shoulder, that is the DIN 258 page on this catalog; where the thread is internal and the pin is pulled with a bolt, it is DIN 7978. Materials, finishes and shear ratings are not tabulated by the collected specification — per RFQ.
| Standard | DIN 7977 — taper pins with external thread; source cross-references ISO 8737 (successor designation) |
|---|---|
| Size range | Nominal taper d 5 – 20 mm, eight sizes in the collected ladder (5, 6, 8, 10, 12, 14, 16, 20) |
| Stud thread | d2: M 5 / M 6 / M 8 / M 10 / M 12 / M 12 / M 16 / M 16 (M 12 repeated at d 12 and 14, M 16 at d 16 and 20 per the source ladder) |
| Thread length | b: 14 / 18 / 22 / 24 / 27 / 30 / 35 / 35 mm across the ladder |
| Release | Nut or threaded puller on the male stud end — replaces drift removal where a blow would damage the assembly |
| Materials / finishes / ratings | Not tabulated by the collected specification — per RFQ (state material, joint load and environment at quotation) |
| Nominal d | Thread Length (b) | Thread (d2) |
|---|---|---|
| 5 | 14 | M 5 |
| 6 | 18 | M 6 |
| 8 | 22 | M 8 |
| 10 | 24 | M 10 |
| 12 | 27 | M 12 |
| 14 | 30 | M 12 |
| 16 | 35 | M 16 |
| 20 | 35 | M 16 |
Materials
- Material and finish specified per RFQ — state the shear load, the clamped stack and the environment; tapered fits are size-critical and confirmed 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 7977 Taper Pins with External Thread) 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
DIN 7977 or DIN 258 — which threaded taper pin does my drawing mean, and what changes at assembly?
Both put a male thread on the large end of the same taper series, and both release with a nut instead of a drift — the collected table carries DIN 7977's cross-reference to ISO 8737, and the two standards differ in the end geometry: DIN 258 machines a shoulder (d2 in its table, 5,5–21,7 mm) that the nut seats against, while DIN 7977 cuts the thread directly onto the taper end with no shoulder ladder — its table is just thread length b (14–35 mm) and thread designation per size. If the drawing dimensions a shoulder, it is DIN 258; if it only calls the thread, DIN 7977. Three readings off the collected DIN 7977 ladder: first, the thread does not step at every size — M 12 covers both d 12 and d 14, and M 16 covers both d 16 and d 20 — so a bigger pin does not automatically mean a bigger stud thread. Second, the ladder includes d 14, which the DIN 258 table does not; a d 14 threaded taper pin points at 7977. Third, b is the thread you have to work with — at the 20 mm pin that is 35 mm of M 16, so the nut plus any puller stack must fit inside that. Taper seat sizing, materials, finishes and shear ratings are all RFQ lines — they are not in the collected table.
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