Dimensional and assembly data for M8X1 Fine-Thread Hex Flange Bolts, Small Series to ISO 15072. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M8X1 Dimensional Row (ISO 15072)
| Size | Pitch P (mm) | a_max (mm) | a_min (mm) | b_0 (mm) | b_1 (mm) | b_2 (mm) | b_3 (mm) | c_min (mm) | d_a_max_F (mm) | d_a_max_U (mm) | d_c_max (mm) | d_s_max (mm) | d_s_min (mm) | d_v_max (mm) | d_w_min (mm) | Width across corners e (mm) | Head height k (mm) | k_w_min (mm) | l_f_max (mm) | r_1_min (mm) | r_2_max (mm) | r_3_max (mm) | r_3_min (mm) | r_4_ref (mm) | Width across flats s (mm) | s_min (mm) | v_max (mm) | v_min (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1 | 3 | 1 | 35 | 22 | 28 | 0 | 1.2 | 9.2 | 10 | 17 | 8 | 7.78 | 8.8 | 14.9 | 10.95 | 8.5 | 3.8 | 2.1 | 0.4 | 0.5 | 0.36 | 0.16 | 5.7 | 10 | 9.78 | 0.25 | 0.1 | 16~80 | ISO 15072 |
Spanner & Drive for M8X1 Fine-Thread Hex Flange Bolts, Small Series
M8X1 Fine-Thread Hex Flange Bolts, Small Series have a width across flats of 10 mm — fit a 10 mm open-ended spanner or socket. A 6-point socket grips all six flats of the 10 mm hex and is what to reach for once a fastener has been on and off a few times; a 12-point ring spanner starts rounding a worn head. For repeatable preload, torque rather than feel.
Hole Sizes for M8X1
| Coarse-thread pitch (ISO 724) | 1 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 9 mm |
| Tapping drill, coarse thread | 7 mm |
Tightening Torque for M8X1
| Class 8.8 (dry, ~µ 0.125) | ≈ 26 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 38 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 45 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M8X1
| Tensile stress area As (ISO 724) | 39.2 mm² |
|---|---|
| Proof load, class 8.8 | 23 kN |
| Proof load, class 10.9 | 33 kN |
| Proof load, class 12.9 | 38 kN |
| Min. ultimate tensile load, class 8.8 | 31 kN |
Proof load = tensile stress area × the proof stress Sp of the class, per ISO 898-1 — Sp is a lower figure than the yield stress Rp0.2 and the two are not interchangeable. The stress area is computed from this size's own diameter and pitch, so a fine-pitch designation gives the fine-pitch figure. Design the joint so the working preload stays below the proof load of the class selected.
M8X1 Fine-Thread Hex Flange Bolts, Small Series Weight
A steel M8X1 fine-thread hex flange bolts, small series at the listed 1,680 mm length weighs approximately 67,964 g each — about 67,964 kg per 1,000 pieces. Stainless A2/A4 weighs roughly the same (density 7.9–8.0 g/cm³).
Actual weight varies slightly with head form, thread and finish; use this figure for freight estimation only.
Installation Tips for M8X1 Fine-Thread Hex Flange Bolts, Small Series
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- On flanged or serrated variants, do NOT add a separate flat washer — the flange already spreads the load and the washer can defeat the locking serrations.
- At M8X1 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M8X1
For M8X1, pair with a M8X1 hex nut (ISO 4032 / DIN 934) and, where used, a M8X1 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need fine-thread hex flange bolts, small series in a size this table does not list?
This page covers M8X1 fine-thread hex flange bolts, small series. Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
