Product Overview
Koike 102-D7-4 Acetylene Cutting Tip, Size 4 - Sealed in the Original Japanese Blister Pack
Condition
New and unused, still sealed in the original Koike blister card. The card is printed GAS CUTTING TIP, carries the Koike logo, www.koikegroup.com and MADE IN JAPAN, and the white strip along the top is stamped with a circled A followed by 102-D7-4 - the acetylene designation and the tip number. Through the clear blister the copper body shows bright unoxidized machining with no torch heat color, no nicks and no seating wear, and the brass seat and gland at the back end are clean with the gas ports open. The photographed piece is a representative unit from the shelf.
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Product Overview
This is a Koike 102-D7 series gas cutting tip in size 4, built for acetylene service. It is a copper nozzle body with a stepped brass seat and gland at the back end: preheat flames ring the face in a circle of small ports around a single central cutting-oxygen bore, which is exactly what the end-on photo shows. The body itself is stamped 102-D7, a 7bar pressure figure, the size number 4, and a millimetre thickness range whose trailing characters read 50mm in the photograph. The listing's published performance figures for this design cite a cutting speed increase of up to 28 percent and a gas consumption reduction of about 26 percent against a standard tip, along with a stainless steel liner credited with several times the service life; treat those as the manufacturer's published claims and check Koike's current data sheet for the pressures and speeds that apply to your torch and plate. Sold as a single tip, size 4, acetylene, part number 102-D7-4.
Key Features
- Part number: Koike 102-D7-4, from the 102-D7 tip series
- Size: 4
- Fuel gas: acetylene, marked with the circled A on the pack
- Construction: copper nozzle body with brass seat and gland
- Face: ring of preheat ports around a central cutting-oxygen bore
- Body markings visible in the photos: 102-D7, 7bar, 4, and a millimetre range ending in 50mm
- Origin: made in Japan, per the printing on the card
- Packaging: sealed original Koike blister card, unopened
- Plate thickness range and working pressures: not confirmed here - verify against Koike's tip chart for your torch before use
Applications
- A fabrication shop welder keeping a matched set of 102-D7 tips on the cart so a worn nozzle never stops a cut mid-shift
- A structural steel crew burning plate on site and wanting a fresh size 4 tip in the tool box rather than a re-tipped, hand-cleaned spare
- A maintenance technician servicing an older Koike-fitted cutting torch that the current parts counter no longer stocks tips for
- A scrap and demolition operator who cuts steel daily and treats cutting tips as a consumable to be replaced, not reamed
Frequently Asked Questions
Is this tip for acetylene, or can I run it on propane or propylene?
Acetylene. The card is stamped with a circled A ahead of 102-D7-4, and the listing has always described it as an acetylene tip. Fuel gases are not interchangeable in cutting tips - the preheat passages are sized for the flame chemistry they were cut for - so match the tip to the gas you are actually running.
Will it fit my cutting torch?
Not confirmed, and it depends entirely on your torch head. The 102-D7 is a Koike tip series with its own seat geometry, so check the tip series your torch is built to accept before ordering. The photos show the full seat, gland and taper from several angles so you can compare against the tip currently in your head.
What is actually stamped on the tip itself?
The copper body carries 102-D7, a 7bar figure, the size number 4, and a millimetre thickness range whose visible characters end in 50mm. The leading digit of that range is not fully legible in the photograph, so treat the range as a figure to confirm on Koike's chart rather than a number we are quoting you.
Has the pack been opened or the tip tried?
No. The blister is intact and the tip has never been in a torch - no heat discoloration on the copper, no scoring on the seat, and the ports are clear and unreamed. Everything described here was read through the sealed packaging, which is why the description sticks to markings and surfaces rather than measured flow or pressure figures.
Why buy one or two tips here instead of a full box from a welding supplier?
Because a cutting tip is a consumable and most people need the size they are burning today, not ten of them. Here you buy the exact count you want - one to get a job finished, two if you like a spare in the cart - rather than a case quantity of size 4 acetylene tips you will still be working through in five years. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A cutting tip is the one part of a torch that gets used up doing its job, and a fresh one turns a ragged, dragging cut back into a clean kerf you can weld to. Put this one in the head, set your pressures, and let the steel fall where you drew the line.
