Tel：
+86 13143444311
Email：sst@szsst88.com
Fax：+0086-755-27322278
Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Galvanized Self Tapping Screws
Materials:Carbon Steel
Surface treatment:Blue Zinc Plated
Head Type:Pan Collar Head
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:784
We manufacture carbon steel pan collar head screws in the 11 recorded sizes M1 to M14, cold headed, thread rolled with blue zinc plating applied after rolling, and inspected against the drawing, for sheet-metal chassis, HVAC panels and light-gauge framing. Head diameter, recess depth, thread length and surface finish are made to your drawing, and the driver bit match is reviewed before production.
Shi Shi Tong supplies carbon steel pan collar head screws on a made-to-order basis. For this item the recorded configuration is Blue Zinc Plated finish, , a machine thread, right hand direction and metric measurement. Any requirement outside the recorded configuration is reviewed against the drawing before the batch runs.
The table below is the specification recorded for this screw, not a catalogue of every size the factory can produce. Where a project needs a different head, drive, thread or finish, the part is reviewed as a drawing-based item.
Carbon steel is chosen where the strength and the cost of the part matter more than corrosion resistance. Because the base metal will rust once the surface is broken, the finish becomes part of the specification rather than an optional extra.
A pan head has a slightly domed top and a flat bearing face under the head. It spreads the clamping load over the joint surface instead of sitting flush in a countersink, which suits through-hole assembly where the head is allowed to stand proud.
The recess or drive size is matched to the tool used on your line. State the driver size or the torque target on the drawing so the head and the drive are reviewed together with the head diameter.
A machine thread engages a pre-tapped hole or a nut rather than cutting its own path into the material. The mating thread has to be prepared to the same size and class, so the screw and the tapped hole are specified together.
Zinc plating puts a sacrificial zinc layer over the steel. Where the coating is scratched the zinc corrodes first and the base metal stays intact.
Packing is recorded as plastic bag + carton. Parts are bagged before they go into the carton so the thread and the head are protected in transit.
The joints below are where these screws actually fail when the geometry is loose, so each paragraph names the failure, what it costs and the dimension we hold:
Sheet-metal chassis and brackets. On self-tapping screws forming their own thread in light-gauge steel brackets, the point misses the pilot and the screw tears the sheet instead of forming a thread. The bracket is scrapped and the chassis is re-riveted, because point taper and the first full thread are not formed in one die sequence. We control it at the source: the point taper, the first thread and the thread pitch are formed in one sequence and checked against the sheet thickness.
HVAC and appliance panels. On screws fixing panels that are assembled on a fast line, the screw strips the formed thread when it is driven a second time after service. The panel has to be replaced and the unit is reworked, because thread pitch is coarser than the panel thickness can support. We control it at the source: thread pitch and the thread length are matched to the panel thickness so two full threads engage.
Light-gauge framing and profiles. On fixings driven into thin-wall profiles without a pilot hole, the screw walks on the surface and does not start, so the fixing is skipped. The installer adds time per fixing and the frame is left short of fasteners, because the point is too blunt for the wall thickness and the drive cannot transfer the starting load. We control it at the source: the point angle and the sharpness of the first thread are controlled so the screw starts without a pilot.
The size field recorded for this item is M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14. Sizes inside that range are quoted against the drawing, because the head diameter, the head height and the length are set per part rather than taken from one stock list.
Where a length or a diameter outside the recorded range is needed, the part is treated as a drawing-based item and the tooling is reviewed before quoting.
Wire and bar are bought against the mill certificate: grade, heat number and standard are checked before forming, and the material report is kept with the production record.
Manufacturing since 1998. Parts are produced to your drawing or sample; overall range M0.8-M16 diameter and 0.4-2000 mm length, each subject to material, structure and process review.
A complete production process holds the dimensional tolerances and the appearance of the part; the inspection scope is agreed with the drawing.
Plain and coated finishes are specified per joint so the head and the thread survive repeated driving; where a locking feature is required it is defined on the drawing rather than added at random.
The route is planned from the approved drawing rather than taken from a stock list:
Inspection follows the features that decide whether the screw assembles: the head, the drive, the thread and the surface.
Results are recorded per batch so a repeat order can be compared with the first delivery.
ISO 9001:2015 Quality Management System Certification and an SGS testing report are the two documents stated for this product. Material reports for the raw wire are available with the shipment.
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Fasteners are bought by people who have to make a line run again next quarter, so the order history is part of the specification.
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8,678+
Customers served
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87%
Repeat orders
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56%
Referral orders
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89
Countries and regions
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Other screws produced to drawing at the same plant:
The material recorded for this item is Carbon Steel. The grade is confirmed against the material report kept with the batch.
The recorded surface treatment is Blue Zinc Plated. Where a project specifies a different finish, the finish is agreed on the drawing before the batch runs.
The size field recorded for this item is M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14. Head diameter, head height and length are set per part against the drawing rather than taken from one stock list.
Yes. A part outside the recorded configuration is treated as a drawing-based item: the head, the drive, the thread and the finish are reviewed together before quoting.
Send the drawing with the head, the drive, the thread and the finish you need. The reply covers the feasible route, the inspection scope and the lead time for the batch.
+86 13143444311
sst@szsst88.com
