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+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:Hi Low Thread Screws
Materials:Carbon Steel
Surface treatment:Nickel Plated, White Zinc Plated
Head Type:Hex Washer Head
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:497
These hi low thread screws combine a carbon steel body with a non-slotted hex washer head. The right-hand thread runs along the shank with alternating high and low crests. White zinc plating and nickel plating are listed finish options; the required finish must be selected for the order.
Define the thread profile, spacing and entry shape rather than selecting only an outside diameter. Supply the receiving material and its hole dimensions. The performance of a hi-low joint depends on how those features interact, so compatibility should be checked in representative components.
The wider bearing portion beneath the hex provides a seating footprint that needs to fit the mounting surface. Show its diameter and thickness, along with the hole opening and nearby edges. Do not assume that the head includes a separate washer or a sealing element.
Specify the across-flats size and head height. Check socket wall clearance and the room needed to withdraw the tool after seating. This version has no screwdriver slot, so the assembly layout should support access to the external hex.
Identify the coating on the purchase drawing and define any appearance reference. White zinc and nickel are distinct options, not a combined specification. Where corrosion testing or restricted-substance documentation is needed, provide the test method and acceptance requirements for review.
Measure the screw length from its bearing face and include the tip geometry. The point and entry region are not equivalent to complete working threads. Review the available engagement after passing through covers, washers or other layers in the assembled stack.
The inspection plan can address both thread heights, the tip, washer-head dimensions and hex tool fit. Finished samples should also be tried in the intended hole. Record substrate and hole tolerances during evaluation so changes in the receiving part are visible.
Is the washer head a waterproof seal?
No sealing function is specified. Any gasket or sealing requirement needs its own design and validation.
Can the thread be used in all plastics?
No universal compatibility is established. Provide the exact substrate and boss or sheet geometry for evaluation.
Can the finish be changed without reviewing fit?
Review the finished dimensions and application requirements when selecting a different coating.
Assess driving behavior, full seating and the required retention in production-representative parts. Include the actual socket or wrench in the trial when access is limited. Approve the thread, head and finish as one defined part specification before ordering.
Send the thread detail, length, tip form, washer diameter, hex size, finish selection and quantity. Include the receiving-material specification and a section through the fastening location so engagement and bearing contact can be reviewed together.
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