M1.6 Miniature Captive Pan-Head Screws are manufactured to Trade series (miniature captive screws) with a coarse thread pitch of 0.35 mm. This page lists the controlling dimensions for the M1.6 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M1.6 Dimensional Row (Trade series (miniature captive screws))
| Thread size | Length options (mm) | Head diameter (mm) | Captive length (mm) | Under-head length (mm) | Maximum torque (N·m) |
|---|---|---|---|---|---|
| M1.6 | 4 / 5 / 6 / 8 / 10 |
Spanner & Drive for M1.6 Miniature Captive Pan-Head Screws
Drive geometry for M1.6 Miniature Captive Pan-Head Screws is given by the row above; match the tool to the listed values.
Hole Sizes for M1.6
| Coarse-thread pitch (ISO 724) | 0.35 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 1.8 mm |
| Tapping drill, coarse thread | 1.25 mm |
Tightening Torque for M1.6
| Class 8.8 (dry, ~µ 0.125) | ≈ 0.2 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 0.3 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 M1.6
| Tensile stress area As (ISO 724) | 1.3 mm² |
|---|---|
| Proof load, class 8.8 | 0.7 kN |
| Proof load, class 12.9 | 1.2 kN |
| Min. ultimate tensile load, class 8.8 | 1 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.
M1.6 Miniature Captive Pan-Head Screws Weight
A steel M1.6 miniature captive pan-head screws at the listed 456,810 mm length weighs approximately 7,210 g each — about 7,210 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 M1.6 Miniature Captive Pan-Head Screws
- Pozidriv (PZ) drivers ride out of Phillips (PH) recesses and vice versa — confirm the recess marking on the head before assembly.
- For automated assembly, an ACR (Anti-Cam-Out Ribs) or torx-equivalent driver gives noticeably longer bit life than plain PH.
- At M1.6 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M1.6
For M1.6, pair with a M1.6 hex nut (ISO 4032 / DIN 934) and, where used, a M1.6 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need miniature captive pan-head screws in a size this table does not list?
This page covers M1.6 miniature captive pan-head screws. Thread size and pitch, length, property class, drive form, head geometry and head marking are all specifiable — the standard part is where it starts, not where it stops. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
