Cold Heading Square Weld Nuts – DIN 928, 4 Projection Boss, for Automotive

Product Content:

The Cold Heading Square Weld Nuts – DIN 928, 4 Projection Boss, for Automotive from Qimao Metal Manufacturer produced to DIN 928 specifications. The cold heading process forms the nut shape and the four projection bosses in one operation, so the material grain stays continuous through the boss area. That matters for weld consistency—the four projections contact the sheet metal simultaneously and collapse evenly during resistance welding, giving you a uniform weld nugget around each boss. The square body resists rotation after welding, so torque loads don’t break the weld loose. We run these in carbon steel for general automotive applications and stainless 304 or 410 where corrosion resistance matters. Thread sizes range from M4 to M16, coarse and fine pitch. These come off our heading presses as finished nuts—no secondary machining required unless your spec calls for specific surface treatment.

Product Specification:

Technical Details:

Product Cold Heading Square Weld Nuts – DIN 928, 4 Projection Boss, for Automotive Material options: low carbon steel (C10C, 10B21), SCM435 alloy, and stainless grades 304 or 410. Thread sizes available from M4 through M16, both coarse and fine pitch—standard DIN 928 covers this range. Base dimensions follow DIN 928 specifications: square body width and height vary by thread size, with the four projection bosses positioned symmetrically on the underside. Projection height is controlled to within ±0.05mm across all four bosses, which is critical for simultaneous contact during welding. As-formed threads fall within 6H tolerance class. Surface condition is as-formed with light oil film from the heading lubricant. We don’t wash it off unless specified—some customers prefer it for their handling operations. Zinc plating, phosphate, or black oxide available on request. Parts are washed and oiled before packaging. Thread gauging done on every batch, not spot checks. Test reports kept on file if your quality system needs them.

Core Advantages:

• Cold Heading Square Weld Nuts – DIN 928, 4 Projection Boss, for Automotive four projection bosses collapse simultaneously during welding, giving you consistent weld nugget formation around each contact point

• Cold heading preserves grain structure through the boss area—no stress risers from cutting operations, which means the weld zone holds up better under fatigue

• Square body geometry prevents rotation after welding, so the threaded connection stays secure under torque load

• Boss height held to ±0.05mm across all four projections—critical for proper resistance welding

• Threads formed in the heading process, not cut—better thread strength and no chips to clean up

Wide Usage:

• Cold Heading Square Weld Nuts – DIN 928, 4 Projection Boss, for Automotive the automotive body-in-white assemblies where permanent threaded attachment points are required in sheet metal panels

• Exhaust system mounting brackets that see vibration and thermal cycling

• Seat frame structures where weld nuts provide accessible thread points for assembly

• Appliance housings and control boxes with sheet metal enclosures

• Agricultural equipment panels where weather resistance is a concern and stainless grades become necessary