Sems Screws
Sems Screws suppliers
Sems Screws factory

Sems Screws

Sems Screws ship with the screw pre-assembled with spring or flat washers; a single drive completes fastening and washer engagement without on-site loose washer fitting, markedly raising line assembly efficiency. After cold heading the washer assembly is completed; washers turn freely and do not fall off. Used for efficient fastening of automotive parts, electronics, sheet metal and furniture, customizable by screw size and washer combination.

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Product Introduction

Product Parameters

Parameter	Specification
Product Type	Screw with pre-assembled washer (Sems)
Assembly Form	Screw + washer pre-assembled as one
Forming Process	Cold heading + rolling + washer assembly
Inspection Method	Thread gauge check, washer freedom check
Customization	Customized per technical drawings or samples

Product Overview

Core Advantages

Screw and washers are pre-assembled; one drive completes fastening, eliminating on-site washer fitting and sorting for high-speed batch assembly.

Washers and screws are supplied as a set, avoiding missing or wrong washers and ensuring per-unit assembly consistency.

Screw thread, washer type and assembly form can be customized from drawings or samples, suiting different clamping and lock needs.

Application Scenarios Scenario

High-efficiency batch fastening of automotive parts and sheet metal.

One-step assembly of electronics housings and brackets.

Washer-matched fastening of furniture and hardware.

OEM/ODM OEM/ODM and private labeling are provided; screw size, washer type and combination form are set per drawings or samples before confidential production. Washer freedom and thread are confirmed on the pre-production sample before mass production; standard non-standard samples take about one month and special combinations about 2-3 months. Off-the-shelf samples are free with the customer paying freight, and the mold fee is deductible against bulk orders.

Quality Control

Quality Control Certified to ISO 9001, IATF 16949, ISO environmental management system and RoHS. For this model, focus is on thread gauge fit, washer-screw assembly tightness and turning freedom, checking washers do not fall off and are not missing, with intact head and recess; wire and washers are inspected incoming, cold heading, rolling and assembly patrolled in stages; products pass salt-spray testing for rust resistance; assembly and appearance spot-checked before dispatch; custom parts undergo 100% inspection before packing, and key characteristics are controlled under APQP, PPAP, FMEA and SPC.

Packaging & Delivery

Sems screws are rust- and moisture-sealed in fixed-quantity boxes to prevent washers and screws separating, into thickened export cartons with dividers; bulk quantities are stretch-wrapped on pallets; outer cartons carry marks, batch number and quantity. EXW, FOB, CIF and CFR are supported, with progress shared through photos and QC details. Standard orders take about one week and bulk orders about one month; after sample approval, custom parts take 10-15 working days for simple structures and 20-30 working days for complex structures, with urgent orders prioritized.

FAQ

Q1: Can washer combination types be specified?

A: Yes. Flat, spring and other washer combinations are set per drawings or samples, then produced after confirmation.

Q2: Do you accept third-party inspection?

A: Yes. We cooperate with pre-production, in-process and pre-shipment inspection and open process and QC records.

Q3: How is arrival damage handled?

A: Verified by damage photos and logistics proof, we provide free reshipment, replacement or negotiated compensation.

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