This page covers M48 Hex Head Cap Screws, Fully Threaded, Grade C to ISO 4018: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (ISO 4018 together with ISO 273, ISO 724 and ISO 898-1 where applicable).
M48 Dimensional Row (ISO 4018)
| Size | Pitch P (mm) | a_max (mm) | a_min (mm) | c_max (mm) | d_a_max (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) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M48 | 5 | 15 | 5 | 1 | 56.6 | 69.45 | 82.6 | 30 | 31.05 | 28.95 | 20.27 | 1.6 | 75 | 73.1 | 100~480 | ISO 4018 |
Spanner & Drive for M48 Hex Head Cap Screws, Fully Threaded, Grade C
M48 Hex Head Cap Screws, Fully Threaded, Grade C have a width across flats of 75 mm — fit a 75 mm open-ended spanner or socket. In tight access a 6-point socket on the 75 mm flats gives the most engagement per degree of swing. Where the joint is torqued to a figure, a click wrench is the only way to reproduce it across a batch.
Hole Sizes for M48
| Coarse-thread pitch (ISO 724) | 5 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 52 mm |
| Tapping drill, coarse thread | 43 mm |
Tightening Torque for M48
| Class 8.8 (dry, ~µ 0.125) | ≈ Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 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 M48
| Tensile stress area As (ISO 724) | 1473 mm² |
|---|
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.
M48 Hex Head Cap Screws, Fully Threaded, Grade C Weight
A steel M48 hex head cap screws, fully threaded, grade c at the listed 100,480 mm length weighs approximately 1,428,468 g each — about 1,428,468 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 M48 Hex Head Cap Screws, Fully Threaded, Grade C
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- Serrated flanges need to sit directly on the joint face. A washer between the two removes the bite and leaves an ordinary bolted joint that is believed to be a locking one.
- At M48 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 M48
For M48, pair with a M48 hex nut (ISO 4032 / DIN 934) and, where used, a M48 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need hex head cap screws, fully threaded, grade c in a size this table does not list?
This page covers M48 hex head cap screws, fully threaded, grade c. 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.
