Tiny Screws For Sunglasses Pan Head

We make tiny screws for sunglasses in nickel plated carbon steel, a pan head with a combined Phillips and slot recess and a half thread, quoted from M1 to M14. Both recess depths, thread length, shank diameter and plating come from your drawing, and the first article is fitted in your hinge.

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ISO 9001:2015 · Manufacturing since 1998 · 8,678+ customers · 89 countries and regions

Made to order – there is no stock catalogue. Each part is produced to your drawing, and production starts after drawing review and first-article approval.

What Tiny Screws for Sunglasses Are

Tiny screws for sunglasses are miniature pan head machine screws used in eyewear hinges, temples and lens mounts, where the head is around a millimetre across and the thread is M1.2 to M1.6. This one is made in carbon steel with a nickel finish, a combined Phillips and slot recess and a half thread, quoted from M1 to M14 with Number 382.

Pan head. A low dome on a small bearing ring, the usual form on an eyewear hinge because it is smooth against the skin and still carries the joint.

Phillips and slot recess. A cross and a straight slot cut into the same head, so the screw can be driven with a PH00 bit or an ordinary flat blade.

Half thread. A threaded length that stops part way down, leaving a plain shank that passes through the first hinge leaf.

Nickel plated steel. A bright, hard deposit over carbon steel, which is the finish eyewear has used for decades because it polishes and takes wear without showing the base metal.

Two Recesses in One Tiny Head

A combined Phillips and slot recess on tiny screws for sunglasses puts two driving shapes into a head that is barely a millimetre deep. The slot is a straight cut across the top; the cross is a pyramid cut into the same face, and where the two intersect the metal between them becomes a set of thin wedges. Those wedges are the part that fails: a flat blade rocks in the slot and breaks the corners of the cross, and once the cross corners are gone the bit has nothing to bite.

The reason the combination exists is the repair kit. Sunglasses are serviced with a jeweller’s screwdriver, and an owner who has lost the PH00 driver can still turn the screw with the blade. The screw gives up a little drive strength to be serviceable with whatever tool is at hand, and on a hinge that is tightened once and left, that is a fair trade.

Depth is the number that decides how the trade comes out on tiny screws for sunglasses. A slot cut to full depth leaves the cross shallow and the blade seats well while the cross does not; a slot cut shallow leaves a cross that works but a blade that skips. Both recesses have to finish inside the head height, so on the smallest sizes the drawing should name the recess depths rather than rely on a standard form.

The half thread is the second half of the design. In a hinge the screw passes through a leaf on one side and threads into the other, so the unthreaded shank acts as a pin in the first hole and the thread only does work in the far leaf. If the thread runs all the way to the head, it cuts into the first leaf as the hinge closes and the joint binds.

Nickel plating is what makes the assembly look right and holds up in service. On a screw this small the deposit is a measurable part of the recess, so the head is cut and the recess gauged with the plating in mind, and the plated part is what the customer’s driver has to fit.

Sizes, Recess and Thread Length

The recorded range is M1 to M14, with M1, M2 and M3 covering the eyewear work. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For tiny screws for sunglasses the quotation carries head diameter, head height, recess depths, thread length and overall length, because on a hinge screw the unthreaded shank length is as important as the thread.

Threaded length should be quoted against the hinge, not against the screw. A half thread that is a fraction long will not let the leaf close, and one that is short leaves too few threads in the far leaf to hold the joint.

Shank diameter is the other number to put on the drawing. It has to be a running fit in the first leaf, and a shank that is oversized turns the hinge into a press fit that binds as soon as it is tightened.

Tiny, Two-Way and Half-Threaded

Three features define tiny screws for sunglasses: the small pan head, the two recesses cut into it and the half thread below. The first makes it an eyewear screw, the second makes it serviceable with a flat blade, and the third lets it act as a hinge pin and a fastener at the same time.

Being serviceable with any tool is the practical value of tiny screws for sunglasses. With tiny screws for sunglasses a single small screwdriver from a repair kit can tighten a hinge or replace a lens screw, and the owner does not need a box of bits for a two-minute job.

The cost is concentrated in the corners of the cross, and it is paid during repair rather than assembly. A flat blade that is too thick for the slot will still go in part way, and the pressure it puts on the cross corners is what strips them.

Nickel over a Hinge Screw

The recorded finish on tiny screws for sunglasses is nickel plating over carbon steel. On an eyewear screw that is the traditional choice: it polishes to a bright finish, it is hard enough to keep the recess sharp through normal use, and it takes the colour of the hinge parts it sits beside. The deposit does add a few microns inside both recesses, and at M1.2 that is a real fraction of the recess depth.

Finish Options for Tiny Sunglasses Screws

Where the frame is worn against skin, nickel release is a consideration in some markets, and the plated parts have to meet the release limit for the grade and the plating specification. That is a conversation worth having before the parts are plated, because it decides the deposit and sometimes the base material.

For sport and marine frames stainless is often the better answer: passivated 304 keeps the recess as cut and does not depend on a coating for corrosion resistance, which matters on a screw that is never looked at until it fails.

Where These Screws Are Used

Three assemblies where tiny screws for sunglasses are the fixing:

Why Shi Shi Tong for Tiny Screws for Sunglasses

Four reasons that matter on an eyewear screw, each tied to what the drawing has to prove:

How These Screws Are Manufactured

Shi Shi Tong forms tiny screws for sunglasses from carbon steel wire on single-die headers that form the pan head and cut the combined recess in one stroke, rolls the half thread to a blunt chamfered end, and nickel plates the finished parts. The first part of every run is measured on head height, both recesses and thread length before the batch continues.

Cutting two recesses into one small head is where the part is decided. The cross is cut first and the slot across it second, and the punch for the slot has to stop before it breaks through the thin metal left by the cross. A punch that is slightly deep leaves a head that looks finished and fails the first time a blade is used.

Inspection: Both Recesses, Shank and Thread

What decides whether tiny screws for sunglasses pass is the head, both recesses, the unthreaded shank, the thread and the plating. The inspection agreement covers those, and the criteria come from the drawing.

Head and recesses on the projector	Thread gauged per batch
Hardness checked on the wire	Coating proved by salt spray

Both recesses are checked for depth and for the metal left between them, the head for diameter and height, and the shank for diameter where it runs in the first leaf. The thread is gauged per batch, and the plating is checked for thickness and appearance against the approved sample.

For tiny screws for sunglasses the first article is also driven with both tools: the PH00 bit at the assembly torque and the flat blade by hand, because the blade is how the screw will be serviced and it is the tool that finds a shallow slot.

Certificates and Material Documentation

Every shipment of tiny screws for sunglasses is traceable to the wire it was made from and to the plating batch. The grade and heat number are recorded on the material certificate supplied with the parts, and the inspection records follow the criteria agreed on the drawing.

ISO 9001:2015	RoHS test report
Registered trademark	Patent: security screw and driver

With each batch we supply the material certificate, the inspection record for the criteria on the drawing and, where it is listed, the third-party report for the coating or the nickel release limit. The documents carry the drawing revision and the batch number, so a repeat order is made to the same recess depths that were approved.

Customers and Projects

More than 8,678 customers in 89 countries and regions have ordered from Shi Shi Tong; 87% of orders come from repeat customers and 56% through referrals. Most projects follow the same route: drawing review, first-article approval, then batches checked against that sample. On an eyewear screw the first article is fitted into the customer hinge, because shank fit and thread length are properties of the pair. Buyers visit during the process to review samples and to see how the heads are formed.

Buyers and quality engineers visit for sample review, process discussion and supplier audits; the visit is arranged around production so the headers and the plating line can be seen on the day the parts run.

Customer group visit – sample review	Customer group visit – process discussion	Customer group visit – factory tour
Customer visit – project kick-off	Danish customer – drawing review	Industry exhibition – meeting customers

Related Products and Guides

Technical Guides

Long Thin Screws: Drawing and Manufacturing Requirements What to put on the drawing for long, thin parts: datum, shank, thread position and handling. Read the guide

How Long Does It Take to Customize Extra-Long Screws? Where the time goes in a custom long-screw order, from drawing review to first article. Read the guide

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Tiny Screws for Sunglasses FAQ

Order Tiny Screws for Sunglasses

How a tiny sunglasses screw project runs from drawing to repeat delivery:

Each step is confirmed with you before the next one starts; the drawing revision from the first article is what repeat orders are checked against.