N Type Neck Hex Bolts
Product: ROOF HEAD BOLTS
Standard: NON STANDARD
Raw material: Q 235 .
Surface: Plain,zinc plated,black oxide,H.D.G,etc.
Specification Range: DIA M16-M20,LENGTH 90MM-100MM
Property Class: 4.8
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Product Introduction
Product: ROOF HEAD N neck bolts
Standard: according to drawing
Raw material: Q 235 SWRCH35K
Surface: Plain,zinc plated,black oxide,etc.
Specification Range: M16*95 M16*90,LENGTH 90-95MM
Property Class: 4.8 etc
OTHERS ACCRODING TO DIN 931/933
Core Production Standard
Base Standard:
DIMENSIONS ACCORDING TO CUSTOMER'S DRAWINGS
Product Grades:
class 4.8
Key Manufacturing Process Points
Raw Material and Forming:
Materials:
Carbon steel (SWRCH Q235#,),
Forming: Cold forging for the ROOF head. Thread rolling for the threads. For partial shank bolts, strict control over the length and diameter tolerance .
Heat Treatment:
Carbon steel grades 4.8, . minimum tensile strength of ≥480MPa. No need heat treatment
Surface Treatment:
Carbon steel: Common treatments include black oxide, zinc plating
Inspection and Quality Control:
Tensile Strength, Yield Strength, Hardness Test
Property Classes and Mechanical Properties
Application Fields
ROOF HEX BOLTS WERE USED IN General Machinery:
Machine tools, pumps, motors. Used for fastening, Class 4.8 is the most common.
01
Machinery:
Chassis, transmissions, engine accessories, crane booms.
02
Selection and Matching:
Choose the appropriate class based on load requirements ( Class 4.8).
Select bolt length such that 1–2 threads are visible beyond the nut after tightening. Avoid lengths that are too long or too short, which can lead to insufficient preload or interference.
Packaging and Logistics
Main Packaging Materials: Small bags, small boxes, cartons, pallets, and iron drums
Customized packaging can be provided
Certification and Guarantee
We are certified by ISO9001:2015, IATF16949:2016, and other international quality standard certifications.
Long-term quality assurance and comprehensive after-sales service are provided.
Founded in 2005, With more than 100 employees, covers 15000 M² workshop.Our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide
factory & quipment
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