M3 Cheese Head Screw (Type B)
This is a 15IP Torx B-type fully threaded precision cheese head screw, size M3×7.9 mm, with a TORXPLUS drive recess for high-torque locking without cam-out or recess damage.
| Thread Dia. M (mm) | M3 |
|---|---|
| Thread Length L1 (mm) | 7.9 |
| Pitch P (mm) | 0.5 |
| Head Dia. D (mm) | 4.9 |
| Head Height H (mm) | 2.5 |
| Drive Type A | TORXPLUS 15IP |
| Drive Depth I (mm) | 1.30-1.50 |
| Part No. | 100118000232 |
Overview
A cheese head tooling screw (Type B) has a cylindrical head with a flat top and a defined head diameter, giving a larger bearing face than a countersunk screw of the same thread. It is used where the screw must clamp against a flat seat rather than sit flush, typically on tool clamping plates and fixture bodies. This listing: thread M3, thread length 7.9, pitch 0.5, head dia. 4.9, head height 2.5, drive TORXPLUS 15IP.
What sets this listing apart: Thread Dia. M (mm) M3 (series runs M2.2 to M4.5); Drive Depth I (mm) 1.30-1.50.
Advantages
Type B geometry has a defined head height and diameter, so the screw can be used as a locating feature as well as a clamp.
The larger bearing area reduces surface pressure on soft fixture plates, preventing the indentation that makes a fixture lose accuracy over time.
Available with the same TORX PLUS drives as countersunk tooling screws, so the same driver set covers both head styles.
The cylindrical head provides a flat bearing face perpendicular to the screw axis, so clamp load is distributed over an area rather than concentrated at a cone.
Applications
Tool clamping plates, fixture body assembly, die and mould clamping, modular fixture systems, and any joint that needs a flat bearing face rather than a flush head.
Cheese head screws protrude above the surface by the head height. Check the clearance envelope before substituting for a countersunk screw — the swap changes stack height by the full head height.
Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.
Specifications across this series
10 parts in this series
| Part | Thread Dia. M | Thread Length L1 | Pitch P | Head Dia. D |
|---|---|---|---|---|
| M2.2 Cheese Head Screw (Type B) · 5.7 / 0.45 / 3.5 | M2.2 | 5.7 | 0.45 | 3.5 |
| M2.5 Cheese Head Screw (Type B) · 7 / 0.45 / 4.1 | M2.5 | 7 | 0.45 | 4.1 |
| M3 Cheese Head Screw (Type B) · 7.9 / 0.5 / 4.9 | M3 | 7.9 | 0.5 | 4.9 |
| M3-1 Cheese Head Screw (Type B) · 10 / 0.5 / 5.5 | M3 | 10 | 0.5 | 5.5 |
| M3.5 Cheese Head Screw (Type B) · 8.75 / 0.6 / 5.5 | M3.5 | 8.75 | 0.6 | 5.5 |
| M3.5-1 Cheese Head Screw (Type B) · 10 / 0.6 / 5.9 | M3.5 | 10 | 0.6 | 5.9 |
| M4 Cheese Head Screw (Type B) · 9.45 / 0.7 / 6 | M4 | 9.45 | 0.7 | 6 |
| M4.5 Cheese Head Screw (Type B) · 10.75 / 0.75 / 6.8 | M4.5 | 10.75 | 0.75 | 6.8 |
| M4.5-1 Cheese Head Screw (Type B) · 14 / 0.75 / 6.4 | M4.5 | 14 | 0.75 | 6.4 |
| M4.5-2 Cheese Head Screw (Type B) · 14 / 0.75 / 6.4 | M4.5 | 14 | 0.75 | 6.4 |
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. M3, Thread Length L1 7.9, Pitch 0.5, Head Dia. 4.9.
What material and finish is it supplied in?
Carbon Steel.
What should I verify before ordering or installing it?
Cheese head screws protrude above the surface by the head height. Check the clearance envelope before substituting for a countersunk screw — the swap changes stack height by the full head height.