Metric Thread Stress and Shear Areas
Per metric thread size M 5 to M 100: the bolt's tensile stress area, and the bolt and nut thread strip (shear) areas per one diameter of engagement under the 6H/6g and 6H/4g6g fits — the areas behind thread-strength and thread-stripping checks.
Last updated: 2026-11
Specifications
Two failure modes live in a threaded connection, and each is checked against its own area. Tension fails the bolt across its tensile stress area — the effective section blending pitch and minor diameter (M 10 x 1.5: 57.990). Shear strips the threads, and that check runs over the thread strip area: the load-bearing helical flank area generated per one diameter of thread engagement, tabulated here separately for the bolt and the nut, and separately for the 6H/6g and 6H/4g6g fit combinations — the nut side carries the larger area (M 16 x 2: bolt 417.55 / 429.92, nut 569.12). The ladder runs M 5 x 0.8 through M 100 x 6. Read it as a set: tensile stress area for the bolt-strength check, strip areas for the engagement check — a common design step is dividing the bolt's tensile load by the strip area to get the bearing pressure on the flanks and sizing engagement length so that the threads, not the bolt, are not the weak link (stripping is sudden; bolt fracture gives warning). Note the source's own quirks, carried verbatim and flagged: the M 8 row's tensile cell prints "5 36.609" with a stray leading 5, and its designation column prints "M12 x 1" against the M 12 coarse pitch of 1.75. Thread tolerances and shear strengths are per RFQ against the governing standards.
| Size range | M 5 x 0.8 to M 100 x 6, 21 thread sizes as the source designates them |
|---|---|
| Tensile stress area | Per size, e.g. M 6 x 1: 20.123; M 20 x 2.5: 244.79; M 48 x 5: 1,473.2; M 100 x 6: 6,994.7 |
| Bolt thread strip area (L e = 1 diameter) | Under 6H/6g and under 6H/4g6g, e.g. M 12: 227.72 / 234.86; em-dash cells at M 22 and M 27 in the 6H/4g6g column as printed |
| Nut thread strip area (L e = 1 diameter) | Under the "6H6g and H/4g6g" header as printed, e.g. M 12: 313.41; M 36 x 4: 3,026.2 |
| Reading | Areas in mm 2 (per the values' magnitude and use); engagement basis is one nominal diameter L e |
| Not tabulated | Shear strengths, thread tolerance classes, required engagement lengths, torque values — per RFQ |
| Thread | Tensile Stress Area | Bolt Thread Strip Area, Le = 1 Diameter | Nut Thread Strip Area, Le = 1 Diameter | |
|---|---|---|---|---|
| 6H/6g | 6H/4g6g | 6H6g and H/4g6g | ||
| M5 x 0.8 | 14.183 | 35.366 | 37.085 | 49.994 |
| M6 x 1 | 20.123 | 51.875 | 54.174 | 73.145 |
| M8 x 1.2 | 5 36.609 | 97.290 | 100.74 | 134.63 |
| M10 x 1.5 | 57.990 | 155.80 | 160.73 | 214.77 |
| M12 x 1 | 84.267 | 227.72 | 234.86 | 313.41 |
| M14 x 2 | 115.44 | 313.94 | 323.24 | 434.47 |
| M16 x 2 | 156.67 | 417.55 | 429.92 | 569.12 |
| M20 x 2.5 | 244.79 | 665.58 | 682.06 | 907.76 |
| M22 x 2.5 | 303.40 | 814.67 | — | 1,100.3 |
| M24 x 3 | 352.50 | 971.10 | 994.23 | 1,320.2 |
| M27 x 3 | 459.41 | 1,246.7 | — | 1,674.3 |
| M30 x 3.5 | 560.59 | 1,549.2 | 1,582.5 | 2,086.5 |
| M36 x 4 | 816.72 | 2,271.5 | 2,315.8 | 3,026.2 |
| M42 x 4.5 | 1,120.9 | 3,120.2 | 3,175.2 | 4,168.3 |
| M48 x 5 | 1,473.2 | 4,119.5 | 4,187.3 | 5,482.0 |
| M56 x 5.5 | 2,030.0 | 5,680.3 | 5,769.4 | 7,510.2 |
| M64 x 6 | 2,676.0 | 7,483.6 | 7,596.4 | 9,847.3 |
| M72 x 6 | 3,459.8 | 9,574.2 | 9,718.5 | 12,478 |
| M80 x 6 | 4,344.1 | 11,922 | 12,101 | 15,419 |
| M90 x 6 | 5,590.8 | 15,217 | 15,446 | 19,534 |
| M100 x 6 | 6,994.7 | 18,856 | 19,170 | 24,059 |
- Row 4 (M8 x 1.2): M8 tensile cell prints "5 36.609" with a stray leading "5" — verified present on the live page itself 2026-11-01; carried verbatim, not normalized (the plausible M 8 coarse-series tensile stress area is 36.609)
- Row 6 (M12 x 1): designation prints "M12 x 1" (ISO metric coarse pitch at M 12 is 1.75) — the source's own designation column, carried verbatim
- Row 4 (M8 x 1.2): designation prints "M8 x 1.2" (ISO coarse pitch at M 8 is 1.25) — carried verbatim
- Row 1 (): nut-column header prints "6H6g and H/4g6g" (vs the bolt columns' "6H/6g", "6H/4g6g" forms) — the source's own header labels, carried verbatim
- Row 10 (M22 x 2.5): em-dash cells at M 22 and M 27 in the 6H/4g6g bolt column: values not tabulated by the source for that combination — carried verbatim
Materials
- Stress and strip areas are thread geometry — they pair with the material strengths of the bolt grade and nut class to decide whether the thread or the bolt fails first. When you RFQ threaded fasteners, give size, pitch, grade/class and engagement available in the joint; where engagement is short we flag the stripping check explicitly and quote against the geometry on this table
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 (Metric Thread Stress and Shear Areas) 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
When do I use the tensile stress area versus the thread strip areas on this table?
Different failure, different area. The tensile stress area answers "will the bolt break in tension?" — divide the tensile load by it to get the stress you compare against the grade's strength (this is the same area the clamp-load and torque calculations use). The thread strip areas answer "will the threads shear off?" — they give the helical flank area engaged per one diameter of engagement, so the check is: bolt or nut load, divided by strip area, compared against the shear strength of the weaker member (usually the nut, if materials are mismatched). Note the nut strip area is consistently the largest column — the internal thread carries more flank area per diameter of engagement. If the engagement your joint allows is shorter or longer than one diameter, scale the strip area linearly with engagement; the check then tells you the minimum engagement before the threads strip before the bolt yields.
What is the difference between the 6H/6g and 6H/4g6g columns, and why do two cells print an em dash?
They are two fit combinations between the nut (6H tolerance position) and the bolt plating/thread tolerance: 6g is the standard external thread fit, while 4g6g is a tighter external tolerance used where plating allowance or fit consistency matters — the tighter external fit leaves slightly more usable thread overlap, which is why the 6H/4g6g strip areas print a few percent larger (M 24 x 3: 971.10 vs 994.23). The table carries the combination the source tabulates on the nut side under a single merged header ("6H6g and H/4g6g"), carried verbatim. The em-dash cells at M 22 x 2.5 and M 27 x 3 mark values the source does not tabulate for the 6H/4g6g combination — read those rows from the 6H/6g column and treat the gap as a source gap, not a zero: for those two sizes, confirm the fit basis on the RFQ.
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