Reference charts for M6–M36: bolt torque, strength grade and weight — every value shows its formula and basis and can be recalculated. Use the companion torque/weight calculators for combinations outside the charts. Free; estimates for quotation and evaluation.
One page per size, M6–M36; switch sizes on the page. Same data source as the calculators, free to use.
Mechanical properties of 7 property classes (4.6–12.9 + stainless A2/A4): proof/tensile/hardness and governing standards, sharing torque chart data.
Torque range and target preload matrix by property class × friction state, Nm↔ft-lb toggle, printable.
Tightening torque for stud bolts at three nut factors (K 0.12/0.15/0.20) × six property classes, target preload included, Nm↔ft-lb toggle.
Grams per piece and kg per 1,000 pcs across the full length series, incl. matching nut/washer unit weights.
Unit weight for straight / J-hook / L-bend / with-end-plate configurations across full length range, method fully disclosed.
kg/m plus per-piece weights for 100–3000 mm lengths, with pitch, root diameter and tensile stress area; kg/m↔lb/ft toggle.
Grams per piece and kg per 1,000 pcs on the GB/T 6170 basis, with width across flats and nut height; kg/1000 pcs ↔ lb/100 pcs toggle.
Flat washers (GB/T 97.1) and spring washers (DIN 127) side by side: OD, thickness and unit weight; kg/1000 pcs ↔ lb/100 pcs toggle.
Weld neck (GB/T 9115) + plate slip-on (GB/T 9119) on one page: DN15–DN300 OD/bolt holes/thickness/raised face, unit weights in carbon steel/304/316L, PN10/PN16 toggle.
GB/T 12-2013 round head square neck: head/neck/dome dimensions with under-head vs overall length side by side, M6–M20 unit weight per length, g and lb toggle.
DN15–DN150: inside width, leg length, overall height and matching thread, with a pipe-OD reverse lookup table and per-configuration weight.
Which hex key (Allen wrench) fits a socket head cap screw: GB/T 70.1 head and socket width across flats plus GB/T 5356 key long and short arm lengths, M3–M24 unit weight by length, g and lb toggle.
For combinations outside the charts — a different K-factor, a different preload ratio, custom sizes.
Unit weight, order total weight and freight estimate for bolts, nuts, washers and threaded rod. Metric & imperial, with per-size weight charts.
Tightening torque range and target preload by property class and friction condition (K-factor method), with printable torque chart.
More tools on the way (chloride corrosion assessment, solar payback period and more).