The IEC60061-3 E27 7006-28A-1 is a NOT GO (stop) limit gauge built to sheet 7006-28A-1 of IEC 60061-3. It checks the minimum outside (major) diameter of the cap thread so caps that would sit loose in the holder are rejected. The E27 cap is an Edison screw with 27 mm nominal major thread diameter — the standard mains screw cap in most of the world. Kingpo machines this gauge in-house from hardened tool steel, inspects it against the sheet before despatch and ships it with a calibration certificate, so it can go straight into an incoming-inspection or production-gauging routine.
What this gauge checks
- That the thread or named dimension has not been cut oversize or worn beyond the maximum limit
- That the part is not loose in its mating holder or cap
- The stop limit specified on the sheet, under the gauge weight or force the sheet allows
The dimension that matters on a E27 cap is 27 mm nominal major thread diameter. It is what decides whether the lamp seats correctly and stays safe in the holder, and it is the geometry this gauge is built around.
Specification
| Standard | IEC 60061-3 (lamp caps, lampholders and gauges) |
| Sheet | 7006-28A-1 |
| Cap type | E27 — Edison screw, 27 mm nominal major thread diameter |
| Gauge class | A NOT GO (stop) limit gauge |
| Purpose on the sheet | NOT GO (stop) gauge for caps on finished lamps |
| Material | Hardened tool steel (stainless steel on request) |
| Calibration | Supplied with a calibration certificate; re-calibration available |
| Made by | Kingpo — machined, inspected and calibrated in-house |
How the test is run
- Condition the gauge and the sample together at ambient temperature and make sure both are clean, dry and undamaged.
- Place the gauge on the cap, or screw the gauge into the holder, using only the weight of the gauge. The sheet allows no additional force.
- Read the limit feature named on the sheet. On cap gauges the centre contact must not project beyond the reference surface.
- Record the result. Any additional force invalidates the test, because the gauge is measuring a limit, not a fit.
The verdict is the sample must not accept the gauge beyond the specified limit. Read the gauge, do not force it: a limit gauge that is forced into place tells you nothing about the part and damages the gauge.
GO and NOT GO — why you usually need both
A single limit gauge proves only one side of a tolerance. A GO gauge shows the part is not too small; a NOT GO gauge shows it is not too large. Running both is the only way to demonstrate a cap or a lampholder sits inside the band, and it is what an auditor will expect to see recorded. If you are building a gauge set from scratch, order the two together and keep them in the same case.
This page is the NOT GO gauge. The matching GO gauge for the same series is listed under related products below.
Getting the right sheet
IEC 60061-3 assigns one sheet number per gauge, and the number is what you should order against. Three things decide it: the cap family, whether you are checking a finished lamp or a lampholder, and which feature is being checked — thread, contact-making, protection against accidental contact, insertion torque or a named dimension. Sending us the sheet number avoids the most common error in this category, which is ordering a cap gauge when the test is on the holder, or the other way round.
Frequently asked questions
Is this gauge supplied with a calibration certificate?
Yes. Every Kingpo gauge is inspected against the sheet before despatch and shipped with a calibration certificate. We can also re-calibrate gauges you already hold.
Which lamps does the E27 version cover?
It covers E27 caps — 27 mm nominal major thread diameter. If your lamp uses a different cap family, the sheet number will be different; send us the cap marking and we will identify the sheet you need.
Can you make a gauge to a drawing instead of to a sheet number?
Yes. We machine to customer drawings as well as to IEC 60061-3 sheets, including modified gauges for production gauging where a full standard gauge is impractical.
What wears out on this type of gauge?
The gauging surfaces and any thread. Limit gauges are inspection tools, not production tools: keep them off the production line, store them dry, and re-calibrate on a cycle set by usage rather than by calendar.
Related gauges and equipment
Other E27 gauges in the same cap family:
- E27-7006-22C-1 Gauge I For Checking Side-Contact Resiliency In Lampholders
- E27-7006-21-5 Gauge For Testing Protection Against Bulb-Neck Damage And For Testing Contact-Making In Lampholders
- E27 Lampholder gauges -
- Cutting Edges E27 Lamp Holder Gauge For Detecting Side Contacts
- 7006-28A-1 E27 Lamp Cap Gauge / NOT GO Gauge For E27 Caps On Finished Lamps
- E27 Lamp Cap Gauge For Dimension S1 Of E27 Caps On Finished Lamps 7006-27C-1
Send the standard, figure number and quantity to Kingpo technical sales for a quotation and delivery date.
Technical Specifications:
| Parameter | Specification |
|---|---|
| Standard | IEC60061-3 |
| Base Type | E27 Edison Screw |
| Thread Diameter | 27mm ±0.01mm |
| Material | Hardened Tool Steel |
| Surface Treatment | Anti-wear Coating |
| Compliance | International IEC Standards |