IEC60061-3 E27 7006-51A-2

The IEC60061-3 E27 7006-51A-2 is a standardized lamp gauge designed for E27 screw base bulbs, ensuring precise compatibility and secure electrical connections in a wide range of lighting fixtures. As part of the IEC 60061-3 international standard, this specification defines the exact dimensions, tolerances, and technical requirements for lamp caps and holders, guaranteeing safety and performance.

The E27 7006-51A-2 designation refers to a 27mm Edison screw base, one of the most widely used bulb sockets globally. This lamp gauge is essential for manufacturers, quality control teams, and engineers to verify thread pitch, diameter, and electrical contact points, ensuring compliance with international lighting standards.

Key Features:

Global Standard Compliance – Meets IEC60061-3 requirements for safety and interchangeability.

Universal E27 Screw Base – Compatible with LED, CFL, incandescent, and smart bulbs.

Precision Engineering – Ensures proper fit, electrical conductivity, and mechanical stability.

Wide Applications – Used in household lighting, commercial fixtures, industrial lamps, and outdoor lighting.

Durable & Reliable – Manufactured to strict tolerances for long-term performance.

The IEC60061-3 E27 7006-51A-2 is a protection-against-accidental-contact gauge built to sheet 7006-51A-2 of IEC 60061-3. It verifies that live parts of the cap cannot be touched when the lamp is inserted into a holder. 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 no live part of the cap can be touched during insertion of the lamp
• The gauge planes specified on the sheet, read visually or with the specified feeler

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

How the test is run

1. Bring the gauge and the lamp to ambient temperature.
2. Push the lamp into the gauge as far as it will go.
3. Read the gauge planes: the lamp plane must not protrude beyond the gauge plane.
4. Record the result. This is a shape check, not a force check — no torque is applied.

The verdict is live parts must not be reachable when the lamp is inserted. 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 gauge is not a GO / NOT GO pair on its own — it reads a specific feature. Pair it with the GO and NOT GO gauges of the same series when you need full dimensional coverage.

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.