M4 Cheese Head Screw (Type A)
M4 Cheese Head Screw (Type A) — carbon steel, for PCB assembly.
| Thread Dia. M (mm) | M4 |
|---|---|
| Overall Length L1 (mm) | 17.5 |
| Pitch P (mm) | 0.7 |
| Head Dia. D (mm) | 6.4 |
| Head Height H (mm) | 2.4 |
| ɸ1 (mm) | 3 |
| ɸ2 (mm) | 3.7 |
| Drive Type A | TORXPLUS 9IP |
Overview
Cheese head tooling screws Type A differ from Type B in head proportion and are used where a slightly lower or differently proportioned cylindrical head is needed to fit an existing counterbore or clearance envelope. The head still provides a flat bearing face, but the height-to-diameter ratio is reduced. This listing: thread M4, overall length l1 (mm) 17.5, pitch 0.7, head dia. 6.4, head height 2.4, drive TORXPLUS 9IP.
What sets this listing apart: Thread Dia. M (mm) M4 — the smallest size in the series (series runs M4 to M8); Drive Depth I (mm) 1.14-1.32.
Advantages
Flat bearing face distributes clamp load and avoids the cone-seat alignment requirement of a countersunk screw.
Defined head diameter lets the screw act as a shoulder or locating element in fixture plate designs.
Shares drive geometry with the rest of the tooling screw range, so tooling stays common across head styles.
Lower head profile than Type B allows use in shallower clearance envelopes without changing the thread size.
Applications
Low-profile fixture plates, modular tooling systems with limited vertical clearance, adapter plates, and retrofits where an existing counterbore limits head height.
Type A and Type B are not interchangeable in a counterbored seat: check head diameter and height against the counterbore before substituting, or the screw will either not seat or not fit.
Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.
Specifications across this series
4 parts in this series
| Part | Thread Dia. M | Overall Length L… | Pitch P | Head Dia. D |
|---|---|---|---|---|
| M4 Cheese Head Screw (Type A) · 17.5 / 0.7 / 6.4 | M4 | 17.5 | 0.7 | 6.4 |
| M5 Cheese Head Screw (Type A) · 21 / 0.8 / 8 | M5 | 21 | 0.8 | 8 |
| M6 Cheese Head Screw (Type A) · 26 / 1 / 10 | M6 | 26 | 1 | 10 |
| M8 Cheese Head Screw (Type A) · 29.5 / 1.25 / 12 | M8 | 29.5 | 1.25 | 12 |
Values are taken from each part’s own attribute set. Changing length, material or finish changes pull-out strength and installation torque, so compare the row that matches your drawing.
Selection and test data: engagement length, standards, salt-spray hours
FAQ
What are the key dimensions of this part?
Thread Dia. M4, Overall Length L1 17.5, Pitch 0.7, Head Dia. 6.4.
What material and finish is it supplied in?
Carbon Steel.
What should I verify before ordering or installing it?
Type A and Type B are not interchangeable in a counterbored seat: check head diameter and height against the counterbore before substituting, or the screw will either not seat or not fit.