Sems Screw
Sems Screw01-04
SEMS are bolts, which are called bolts with a dodecagon at the end. The main feature of these the screws is they are equipped with corresponding washers, which is convenient to use. The biggest advantage is that can saves time and does not require any manual adjustment of the flat pad, which can make the production line easily, and quickly to improve work efficiency.
  • Product Properties
  • Why Choice TOPIST
  • How to Make
  • Trading Info
Standard: ISO, DIN, JIS, IFI
Place of Origin: TAIWAN
Size: M2.9~M6.3(#5~#16)
Material: 1. Carbon steel: C1010, C1022
2. Alloy steel: SCM435, 10B21
3. Stainless Steel: SS304
Length: 1/4“~6”(6.35mm~150mm)

Advantages of SEMS:

  • Pre-assembled parts ensure faster assembly speed.
  • Reduce the failures caused by people, improper assembly or forgot to install the lock washer.
  • It is easy to assemble very small size products.
  • It can be maintained and repaired in hard-to-reach or restricted areas.
  • Reduce commodity numbers, optimize inventory and logistics, and save costs.
  • Remove is faster and easier. Loosing lock washers are difficult to remove, especially from the counterbore.


Why you choose Top Green’s SEMS:

  • Economy Price
  • Fast Lead Time
  • Exquisite package, and it can be matched with various labels, small bags, small boxes, elevator cards, printed color boxes, tool boxes, buckets, and can be pasted with customized labels.
  • International enterprises appointed supplier, such as ITW, Würth, FASTENAL (FASTCO), DiversiTech...... etc.
  • The quality inspection conducted in six shifts a day to ensure quality is priority.
  • One-stop service, from quotation, orders to ship the cargo, quality is our priority. We offered the full inspection report according to customer’s demand.
  • Before packaging, we have sorting machine to avoid any foreign parts mixed in.
  • We Obtained German patent certificate and American patent certificate with wing tail screws in 2004 and 2005, and the quality has been recognized internationally.


In Top Green, every manufacturing process is critical. The first step is qualified raw materials to be used. Materials we used all come from CSC or trusted suppliers. After that, the selected materials will be tested by our technicians to check it’s qualified or not. From the beginning of the screw operation, the computer is used for quality control. Once the mold is cracked during the production process, computer will interfere and shut down the power compulsory. Not only that, the quality inspection personnel will conduct inspections in three shifts in the morning and three shifts in the afternoon to ensure the quality is priority. The washer is put into the vibrating plate, the screws are slipped and merged under another vibrating plate, and they are merged into the washer hole one by one, then entering the thread rolling machine. When the outside diameter of the rolled thread expands larger than the inner diameter of the washer, the washer would be stuck at the top of the screw. Once the customer doing construction, there is no need to purchase washer for assemble firstly to save more time and manpower. Before shipment, the quality department will take samples to test the speed of drilling (the thickness of the iron plate is according to the specification / the load is also in the specification). Once it does not meet the requirements, we will discuss with other colleagues internally to clarification the responsibility and solution immediately.

In addition to standard parts, Top Green also provided customized items that meet your needs and preferences. We follow the customer's requirements and OEM, also have capability to provide technical suggestions to improve your products. Our business will support you at any time and ensure that the parts are suitable for your specific application.

Min.Order Quantity : 100M
FOB Price :
  • Currency:USD,EUR,JPY,NTD(domestic market only)
  • Price Level:
  • Quoting Unit: Per1,000pcs(=Mpcs),Per Box(Custom)
Payment Terms : □ L/C
□ D/A
□ D/P
□ T/T
□ Western Union
□ MoneyGram
□ Other
Supply Ability : 500Ton/Month
Delivery Period : Lead Time:60 Days after sample being approved
Package : Bulk packing , Small Box packing , Pail packing , PV plastic box packing , Poly bag/set packing , Or Custom packing
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