Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors) screw size
M4 · 8 to 10 mm long
Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors) takes M4 metric screws in lengths from 8 to 10 mm.
The record covers terminal Screw Torque Specifications table explicitly lists Terminal Screw Size for VFD68 drive terminal blocks including M4 with matching N·m torque values for various kW ratings.
This entry is marked confirmed and comes from docs.johnsoncontrols.com.
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors) screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M4 | 8–10 mm | 0.7 mm | not stated | not stated | Terminal Screw Torque Specifications table explicitly lists Terminal Screw Size for VFD68 drive terminal blocks including M4 with matching N·m torque values for various kW ratings | Confirmed |
Fitment records and sources
Terminal Screw Torque Specifications table explicitly lists Terminal Screw Size for VFD68 drive terminal blocks including M4 with matching N·m torque values for various kW ratings
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Unplug the appliance and discharge any capacitors before removing covers.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 8–10 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- Manual gives torque only, not screw length/drive type — verify physically before sourcing replacements.
- Water heater elements use pipe threads (NPSM/NPT), not metric machine screws.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
More in Appliances & HVAC
The same screw also fits
Devices whose records share a thread with Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors), closest length match first.
- Microwave housing and control panel also M4 × 8–10 mm
- HVAC register and diffuser faceplates also M4 × 10 mm
- Dishwasher control console also M4 × 8–10 mm
- Drip coffee machine housing also M4 × 10 mm
- Espresso machine group head also M4 × 10 mm
- Furrion RV appliance trim kit hardware also M4 × 10 mm
- Dyson vacuum motor housing also M4 × 10 mm
- Washer / dryer top panel also M4 × 10 mm
Questions about Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors) screws
- What size screw does Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors) use?
- M4 × 8–10 mm for terminal Screw Torque Specifications table explicitly lists Terminal Screw Size for VFD68 drive terminal blocks including M4 with matching N·m torque values for various kW ratings.
- How long are the screws in Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors)?
- The records range from 8 to 10 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Johnson Controls PENN VFD68 Variable Frequency Drive (used on pumps, mixers, HVAC/water treatment motors)?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.