Hex Flange Nuts for Automotive Structural Joints — Serrated and Flat Flange
Hex Flange Nuts
Hex nuts with integrated flange — the flange replaces a separate washer, distributes clamp load, and anti-rotation serrations (where specified) prevent backing-off under vibration. Paired with hex flange bolts, cold-forged structural bolts, and stud assemblies across automotive Tier 1 / Tier 2 programmes.
Supply across DIN 6923 (serrated), flat-flange variants, JIS B1190, and ISO 4161 specifications. Configurations matched per customer property class (class 6 / 8 / 10), thread pitch (coarse / fine), coating, and flange geometry per programme. Most competitive on programmes requiring PPAP / IMDS / CQI documentation alongside volume pricing — pure commodity-price programmes may find more competitive supply elsewhere.
Why source through Way Fast
We serve Tier 1 and Tier 2 automotive suppliers — primarily to North American OEM programs, including platforms shared with European and Japanese brands — with day-to-day experience handling the documentation and tolerance standards these projects demand.
01 · Multi-source capacity
Working with multiple qualified manufacturing partners — we match each order to the best-fit production line, stabilizing lead times and cost when single-source capacity tightens.
02 · Submission-grade documentation
Full support for PPAP (Levels 1–3), IMDS submission, and RoHS / REACH documentation.
03 · Audited special-process chain
Partners certified to AIAG CQI-9 (heat treat), CQI-11 (plating), and CQI-12 (coating) — covering the full post-processing chain under audited special-process controls.
04 · Multilingual drawing review
Technical drawing review in English, German, Japanese, and Chinese — including ISO 8015 GPS callouts, JIS standards, thread tolerance classes, and coating specifications.
05 · Flange geometry and property class
Flange profile (serrated for anti-vibration, flat for bearing distribution with separate washer), property class (6 / 8 / 10 for pairing with class 6.8 / 8.8 / 10.9 bolts), and coating (zinc flake, Dacromet, Geomet, phosphate) matched per customer torque spec and service environment — drawing-reviewed against bolt pairing and joint requirement.
Family coverage · 3 types
Selecting across hex flange nut types
Serrated Flange (DIN 6923)
Anti-vibration · mainstream
Serrated flange bearing face provides anti-rotation grip. Standard for automotive chassis, suspension, engine, and exhaust joints where continuous vibration requires locking nut function without an additional lock washer. Widely specified across DIN 6923 mainline automotive programmes.
Flat Flange
Bearing distribution · separate washer
Smooth flange bearing face. Used where a separate lock washer, chemical thread-lock, or nylon-insert is preferred over serrated engagement, or where the mating surface must not be marked by serrations.
High-strength · Class 10
Critical joints · paired with class 12.9 bolts
Property class 10 hex flange nut — heat-treated alloy steel for critical-joint applications paired with class 12.9 bolts. Cylinder head, main bearing caps, connecting rods, and other high-stress structural joints.
Sizes
M3 – M30 · #4 – 1-1/4″
Lengths
N/A — nut height per DIN 6923 / ISO 4161 / JIS B1190 specification.
Material
Medium-carbon steel (cold-headed, heat-treated for class 8 / 10), stainless steel (A2 / A4), or brass — per customer specification.
Finishes
Zinc, zinc flake (Dacromet®, Geomet®), zinc-nickel, Delta-Seal®, phosphate-and-oil, black oxide, or to customer specification.
Head types
N/A — nut form per DIN / ISO / JIS standard.
Drive
N/A — installation by standard torque wrench per thread specification.
Lead times
Quotation and production
Quotation
Within 5–7 business days from receipt of drawing and specifications.
Sample & production
Schedules issued per project.
Send your drawing, property class, flange profile (serrated / flat), coating, documentation scope (PPAP / IMDS / CQI), and target volume — specification and manufacturer matched per programme.
Supplied through qualified manufacturing partners to DIN 6923 / JIS B1190 / ISO 4161 specifications. Custom-configured per programme with PPAP / IMDS / RoHS / REACH documentation.
