Alpha
Alpha Self-Tapping Screw 1.021974
Alpha M4.2 x 50mm crosshead self-tapping screw, part number 1.021974, for use on Alpha gas boilers.
At a glance
- Also known as SELF-TAPPING-SCREW, 42X50-SELF-TAPPING-SCREW-CROSSHEAD, 1258069
£0.53
£0.44 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Alpha 1.021974 is a crosshead self-tapping screw measuring M4.2 x 50mm. It is a fixing used on Alpha gas boiler appliances to secure components and casing panels. Self-tapping screws cut their own thread as they are driven, so they are used where a fixing point is formed in sheet metal or a pre-drilled hole.
Signs this part needs replacing
- The crosshead is rounded or chewed, so the driver slips when turning
- The screw shank is corroded or rusted
- The thread no longer bites and the screw spins without tightening
- The screw is missing after a service or repair, leaving a panel or component unsecured
Before you order
- Check your boiler model against the fit list above
- Confirm the screw size and head type match the fixing point you are replacing
- Check how many fixings are needed before ordering
Compliance
| Alternative numbers | SELF-TAPPING-SCREW, 1021974, 42X50-SELF-TAPPING-SCREW-CROSSHEAD, 1258069 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA HE CB25 | 47-532-25 | 47-532-25 | — | — |
| ALPHA HE CB25 (LPG) | 47-532-27 | 47-532-27 | — | — |
| ALPHA HE CB33 | 47-532-26 | 47-532-26 | — | — |
| ALPHA HE CB33 (LPG) | 47-532-44 | 47-532-44 | — | — |
| ALPHA HE SY25 | 41-532-07 | 41-532-07 | — | — |
| ALPHA HE SY25 (LPG) | 41-532-12 | 41-532-12 | — | — |
| ALPHA HE25 | 47-532-41 | 47-532-41 | — | — |
| ALPHA HE25 (LPG) | 47-532-42 | 47-532-42 | — | — |
| ALPHA HE33 | 47-532-43 | 47-532-43 | — | — |
| ALPHA HE33 (LPG) | 47-532-44 | 47-532-44 | — | — |
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
ALPHA appliance manual — HE CB25 (GC 47-532-25), HE CB25 (LPG) (GC 47-532-27), HE CB33 (GC 47-532-26), HE CB33 (LPG) (GC 47-532-44), HE SY25 (GC 41-532-07), HE SY25 (LPG) (GC 41-532-12)
manualmanualALPHA appliance manual — HE25 (GC 47-532-41), HE25 (LPG) (GC 47-532-42), HE33 (GC 47-532-43), HE33 (LPG) (GC 47-532-44)
manualNo technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.