DIN 7984 Hexagon Socket Head Cap Screws with Low Head
DIN 7984 low-head hexagon socket cap screws M3 to M24 — the reduced-height member of the socket cap screw line for confined heads — with the full collected per-size table: thread pitch, thread length b per length class, head and shank tolerances, socket sizing and across-corners minimums.
Last updated: 2026-11
Specifications
DIN 7984 answers a single constraint: the joint has headroom for a socket drive but not for a full DIN 912 head. The low head keeps the hexagon socket and the cylindrical bearing face of the cap-screw family, drops the head height, and accepts the consequences — a smaller socket, a shorter wrench engagement and a bearing diameter that stays close to the standard head so seating pressure does not spike. The series is wide for a low-head screw: M3 through M24, with the non-preferred (M14), (M18) and (M22) stepping the coarse ladder. The collected table carries, per size: pitch P; thread length b in three length classes (L ≤ 125, 125 < L ≤ 200 and L > 200 mm — slash cells reproduce the source, which leaves the longer classes untabulated at the smaller sizes); head diameter d k and shank d s with max (= nominal) and min values; head height k max/min; socket across-flats s nominal with tolerances; socket depth t nominal/max/min; and across-corners e min. Choosing within the family is a height-versus-strength decision like the button head, but with a cap-style bearing face: DIN 7984 keeps cylindrical seating and a hex socket sized for a proper wrench fit, so it is the low-profile choice where the joint still sees real clamp load — fixture builds, machine covers, tooling plates. Where even this height is too much and load is secondary, the ISO 7380-1 button head is the lower and weaker neighbour; where full height fits, DIN 912 / ISO 4762 remains the stronger default.
| Standard | DIN 7984 — hexagon socket head cap screws with low head |
|---|---|
| Series | M3, M4, M5, M6, M8, M10, M12, (M14), M16, (M18), M20, (M22), M24 — parenthesized sizes are non-preferred |
| Tabulated geometry | Per size: pitch P, thread length b per length class (L ≤ 125 / 125 < L ≤ 200 / L > 200 mm, "/" where the source stops tabulating), head dia d k max/min, shank d s max/min, head height k max/min, socket s nominal/max/min, socket depth t nominal/max/min, across-corners e min |
| Family positioning | Low-head member of the socket cap screw line — DIN 912 / ISO 4762 is the full-height default; ISO 7380-1 button head is the lower, lower-strength neighbour |
| Materials / strength | Not tabulated by the collected specification — per RFQ (property class and stainless grade per drawing callout) |
| Nominal thread | P — pitch (mm) | b, L ≤ 125 (mm) | b, 125 < L ≤ 200 (mm) | b, L > 200 (mm) | d k max (= nominal) (mm) | d k min (mm) | d s max (= nominal) (mm) | d s min (mm) | k max (= nominal) (mm) | k min (mm) | s nominal (mm) | s max (mm) | s min (mm) | t nominal (mm) | t max (mm) | t min (mm) | e min (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 12 | / | / | 5.5 | 5.32 | 3 | 2.86 | 2 | 1.86 | 2 | 2.1 | 2.02 | 1.5 | 1.62 | 1.38 | 2.3 |
| M4 | 0.7 | 14 | / | / | 7 | 6.78 | 4 | 3.82 | 2.8 | 2.66 | 2.5 | 2.6 | 2.52 | 2.3 | 2.42 | 2.18 | 2.87 |
| M5 | 0.8 | 16 | / | / | 8.5 | 8.28 | 5 | 4.82 | 3.5 | 3.32 | 3 | 3.1 | 3.02 | 2.7 | 2.82 | 2.58 | 3.44 |
| M6 | 1 | 18 | / | / | 10 | 9.78 | 6 | 5.82 | 4 | 3.82 | 4 | 4.12 | 4.02 | 3 | 3.12 | 2.88 | 4.58 |
| M8 | 1.25 | 22 | 28 | / | 13 | 12.73 | 8 | 7.78 | 5 | 4.82 | 5 | 5.14 | 5.02 | 3.8 | 3.95 | 3.65 | 5.72 |
| M10 | 1.5 | 26 | 32 | / | 16 | 15.73 | 10 | 9.78 | 6 | 5.82 | 7 | 7.175 | 7.025 | 4.5 | 4.65 | 4.35 | 8.01 |
| M12 | 1.75 | 30 | 36 | / | 18 | 17.73 | 12 | 11.73 | 7 | 6.78 | 8 | 8.175 | 8.025 | 5 | 5.15 | 4.85 | 9.15 |
| (M14) | 2 | 34 | 40 | / | 21 | 20.67 | 14 | 13.73 | 8 | 7.78 | 10 | 10.175 | 10.025 | 5.3 | 5.45 | 5.15 | 11.43 |
| M16 | 2 | 38 | 44 | 57 | 24 | 23.67 | 16 | 15.73 | 9 | 8.78 | 12 | 12.212 | 12.032 | 5.5 | 5.65 | 5.35 | 13.72 |
| (M18) | 2.5 | 42 | 48 | 61 | 27 | 26.67 | 18 | 17.73 | 10 | 9.78 | 12 | 12.212 | 12.032 | 6.5 | 6.68 | 6.32 | 13.72 |
| M20 | 2.5 | 46 | 52 | 65 | 30 | 29.67 | 20 | 19.67 | 11 | 10.73 | 14 | 14.212 | 14.032 | 7.5 | 7.68 | 7.32 | 16 |
| (M22) | 2.5 | 50 | 56 | 69 | 33 | 32.61 | 22 | 21.67 | 12 | 11.73 | 14 | 14.212 | 14.032 | 8 | 8.18 | 7.82 | 16 |
| M24 | 3 | 54 | 60 | 73 | 36 | 35.61 | 24 | 23.67 | 13 | 12.73 | 17 | 17.23 | 17.05 | 8 | 8.18 | 7.82 | 19.44 |
| Length (mm) | Weight kg/1000 pcs — M4 | Weight kg/1000 pcs — M5 | Weight kg/1000 pcs — M6 | Weight kg/1000 pcs — M8 | Weight kg/1000 pcs — M10 | Weight kg/1000 pcs — M12 | Weight kg/1000 pcs — M14 | Weight kg/1000 pcs — M16 | Weight kg/1000 pcs — M18 | Weight kg/1000 pcs — M20 | Weight kg/1000 pcs — M22 | Weight kg/1000 pcs — M24 | Weight kg/1000 pcs — M27 | Weight kg/1000 pcs — M30 | Weight kg/1000 pcs — M33 | Weight kg/1000 pcs — M36 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 1.3 | 2.2 | 3.6 | |||||||||||||
| 12 | 1.5 | 2.5 | 3.9 | 7.7 | ||||||||||||
| 16 | 1.9 | 3.1 | 4.5 | 8.8 | 15.5 | 22.3 | ||||||||||
| 20 | 2.3 | 3.7 | 5.2 | 10.2 | 17.9 | 25.5 | 37.9 | 52.5 | ||||||||
| 25 | 2.7 | 4.4 | 6.2 | 12.5 | 20.2 | 29.5 | 42.5 | 56.5 | 77.0 | |||||||
| 30 | 3.2 | 5.1 | 7.3 | 14.0 | 22.0 | 32.5 | 48.0 | 63.0 | 84.6 | 108 | ||||||
| 35 | 3.4 | 5.8 | 8.3 | 15.7 | 25.5 | 36.5 | 53.0 | 69.7 | 93.3 | 118 | ||||||
| 40 | 4.2 | 6.6 | 9.5 | 17.5 | 28.5 | 40 | 58.0 | 78.7 | 102 | 128 | 185 | |||||
| 50 | 5.2 | 7.3 | 11.5 | 21.5 | 34.8 | 48 | 69.5 | 91.5 | 119 | 150 | 215 | |||||
| 60 | 9.0 | 13.6 | 25.3 | 40.3 | 57 | 82.0 | 107 | 138 | 172 | 245 | 263 | |||||
| 70 | 15.7 | 29.1 | 46.0 | 65 | 92.5 | 122 | 157 | 196 | 275 | 298 | 445 | 498 | ||||
| 80 | 32.8 | 52.5 | 72 | 104 | 140 | 178 | 222 | 305 | 333 | 490 | 552 | 793 | ||||
| 90 | 57.8 | 80 | 116 | 154 | 196 | 245 | 335 | 369 | 535 | 607 | 860 | 1000 | ||||
| 100 | 88 | 127 | 169 | 215 | 269 | 365 | 407 | 580 | 662 | 927 | 1080 | |||||
| 110 | 139 | 183 | 235 | 292 | 395 | 439 | 625 | 717 | 994 | 1160 | ||||||
| 120 | 151 | 198 | 255 | 316 | 425 | 474 | 670 | 772 | 1060 | 1240 | ||||||
| 130 | 212 | 275 | 342 | 455 | 510 | 715 | 827 | 1130 | 1320 | |||||||
| 140 | 226 | 295 | 368 | 485 | 545 | 760 | 880 | 1190 | 1400 | |||||||
| 150 | 315 | 394 | 515 | 580 | 805 | 940 | 1250 | 1470 | ||||||||
| 160 | 422 | 545 | 616 | 850 | 990 | 1320 | 1550 | |||||||||
| 170 | 448 | 575 | 651 | 895 | 1050 | 1380 | 1630 | |||||||||
| 180 | 474 | 605 | 687 | 940 | 1100 | 1450 | 1710 | |||||||||
| 190 | 635 | 722 | 995 | 1160 | 1510 | 1790 | ||||||||||
| 200 | 665 | 758 | 1030 | 1210 | 1580 | 1870 |
- Row 1 (10): Column alignment note (batch-level, anchored here): the 16 weight columns align one-to-one to the source header sizes (M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36); verified against the rendered grid (rowspan/colspan expanded) and the monotone per-size weight progressions, not inferred from the flattened markup alone. The first grid row is a lone "Length" section label, carried as the first-column semantics.
Materials
- Material, property class and finish specified per RFQ — the collected specification table covers geometry only
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 7984 Hexagon Socket Head Cap Screws with Low Head) 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 10,000 pieces. Stock items run 3–7 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
Why choose DIN 7984 over the ISO 7380-1 button head for a low-profile joint?
Bearing face and drive fit. DIN 7984 keeps the cylindrical bearing face and the fully seated hex socket of the cap-screw family, so it behaves like a cap screw under clamp load and torques predictably; the button head is lower still but spreads its load under a dome and is rated lower per the tensile rows on its page. The collected DIN 7984 table runs to M24, well past the button-head series, so it also covers heavy low-head applications the button line never reaches.
What should an RFQ for DIN 7984 screws state?
The designation, thread size and length (state which length class applies — the b rows on this page are tabulated per L ≤ 125 / 125 < L ≤ 200 / L > 200 mm), property class or stainless grade, finish, any certificate requirement such as a mill test report per EN 10204 3.1, and quantity per size. Head and socket tolerances are in the table on this page; commercial terms follow the quotation.
What is the MOQ and lead time for these screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock diameters, lengths or finishes are quoted with a confirmed schedule. Common sizes in this designation are widely stocked — confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
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