Go gauges for screw threads of lampholders E14 - 7006-25-7

Go gauges for screw threads of lampholders E14 | 7006-25-7

Purpose: to check the minimum dimensions of the lampholder screw thread and dimension X shown on the sheet 7006-20.
Testing: it shall be possible to screw the gauge into the lampholder without using undue force.(for the torque to be applied in case of doubt, see IEC238, subclause 4.4).
when the gauge has been screwed in as far as it will go, the rim of the screw shell of the lampholder shall be co-plannar with, or project beyond, surgace Y1 but it shall not project beyond surface Y2.

RELATED GAUGES:

"go" Gauges For Screw Threads of Lampholders E14, 7006-25-7
"not go" gauges for screw threads of lampholders E14, 7006-26-4
Plug Gauge For E14 Lampholder For Testing Contact Making, 7006-30-2
Gauge For Testing Contact-Making of Lamps In Lampholders E14, 7006-31-4
Plug Gauge for Lampholders E14 with candle shaped shaft for candle lamps for testing contact making, 7006-30A-1

The Go gauges for screw threads of lampholders E14 - 7006-25-7 is a GO (pass) limit gauge built to sheet 7006-25-7 of IEC 60061-3. It checks the minimum dimensions of the lampholder thread and the mechanical compatibility of the holder with lamps having adverse dimensions. The E14 cap is an Edison screw with 14 mm nominal major thread diameter — small Edison screw (SES) caps used on candle, appliance and decorative lamps. 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

• Minimum / maximum limit of the thread or named dimension, as defined on the sheet
• That the part is not cut undersize (a GO gauge that will not enter is a reject)
• Mechanical compatibility with the mating part at the adverse end of the tolerance range

The dimension that matters on a E14 cap is 14 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. Condition the gauge and the sample together at ambient temperature and make sure both are clean, dry and undamaged.
2. Present the gauge to the sample. A GO gauge is assembled using only the weight of the gauge or light finger pressure — never a tool.
3. Read the limit feature named on the sheet. On cap gauges the centre contact must be co-planar with, or project beyond, the reference surface.
4. Record the result. A GO gauge that will not enter is a reject; do not force it to make the test pass.

The verdict is the sample must accept the gauge freely. 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 GO gauge. The matching NOT 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 E14 version cover?

It covers E14 caps — 14 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 E14 gauges in the same cap family:

• E14 lamp cap gauge - Not go gauge for E14 caps on finished lamps - 7006-28B-1
• Gauge for testing contact-making and protection against accidental contact during insertion of lamps in lampholders E14
• IEC60061-3 E14 7006-55-2
• E14 lamp cap gauge - Not go gauge for E14 caps on finished lamps - 7006-28B-1
• E14 lamp cap gauge - Gauge for finished lamps fitted with E14 caps for testing contact making - 7006-54-2
• E14 lamp cap gauge - Gauge for finished lamps fitted with E14 caps for testing protection against accidental contact

Send the standard, figure number and quantity to Kingpo technical sales for a quotation and delivery date.