(M7) Hex Head Bolts with Reduced Shank (ISO 4015) are specified by thread size, length and head dimensions. The (M7) row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
(M7) Dimensional Row (ISO 4015)
| Size | Pitch P (mm) | b1 (mm) | b2 (mm) | c_max (mm) | d_a_max (mm) | d_s (mm) | d_w_min (mm) | Width across corners e (mm) | Head height k (mm) | k_max (mm) | k_min (mm) | k_w_min (mm) | r_min (mm) | Width across flats s (mm) | s_min (mm) | x_max (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (M7) | 1 | 20 | 0 | 0.6 | 7.8 | 6.2 | 9.47 | 11.94 | 4.8 | 5.04 | 4.56 | 3.19 | 0.25 | 11 | 10.57 | 2.5 | 30~70 | ISO 4015 |
Spanner & Drive for (M7) Hex Head Bolts with Reduced Shank
(M7) Hex Head Bolts with Reduced Shank have a width across flats of 11 mm — fit a 11 mm open-ended spanner or socket. A 6-point socket grips all six flats of the 11 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.
(M7) Hex Head Bolts with Reduced Shank Weight
A steel (M7) hex head bolts with reduced shank at the listed 3,070 mm length weighs approximately 931 g each — about 931 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 (M7) Hex Head Bolts with Reduced Shank
- 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.
Mating Parts for (M7)
For (M7), pair with a (M7) hex nut (ISO 4032 / DIN 934) and, where used, a (M7) flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need hex head bolts with reduced shank in a size this table does not list?
This page covers (M7) hex head bolts with reduced shank. Where the standard stops, the drawing takes over: fine pitches, left-hand threads, partial threading, and property classes above the catalogued grade where material and heat treatment allow. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
