GB6172 316 A4-70 Stainless Steel Hex Wafer Thin Jam Nut M3–M16

GB6172 316 A4-70 Stainless Steel Hex Wafer Thin Jam Nut — M3–M16

GB6172 316 A4-70 stainless steel hex wafer thin jam nuts are the marine-grade choice for jam locking, position adjustment, and height-restricted fastening in corrosive environments. The 316 (A4) stainless steel with molybdenum addition provides superior resistance to chloride pitting and crevice corrosion compared to 304 (A2), making these the correct specification for marine, coastal, food processing, and chemical plant applications.

Key Specifications

Why Choose 316 A4-70 Thin Jam Nuts?

• 316 marine-grade stainless — molybdenum content resists chloride pitting and crevice corrosion; correct specification for marine, coastal, and chemical environments
• A4-70 grade — minimum tensile strength 700 MPa; suitable for structural jam locking and load-bearing applications
• Thin wafer profile — approximately half the height of a standard hex nut; fits restricted height applications and reduces assembly stack height
• GB6172 standard — Chinese national standard equivalent to ISO 4035; widely specified in marine and industrial applications
• M3–M16 range — covers electronics (M3–M6) through structural marine and architectural assembly (M10–M16)

Typical Applications

• Marine hardware and boat fitting jam locking (M6–M16)
• Coastal and offshore equipment threaded rod adjustment (M8–M16)
• Food processing and pharmaceutical machinery height adjustment (M6–M12)
• Chemical plant and process equipment fastening (M8–M16)
• Swimming pool and water treatment equipment (M6–M12)
• Outdoor architectural threaded rod and tension rod assemblies (M10–M16)

Compatible With

• Standard metric coarse thread bolts, studs, and threaded rod M3–M16
• 316 A4 stainless steel hex nuts (DIN934) for jam locking pairs
• Spanner / socket: M3=5.5mm, M4=7mm, M5=8mm, M6=10mm, M8=13mm, M10=17mm, M12=19mm, M16=24mm AF

Package Contents

• GB6172 316 A4-70 hex wafer thin jam nuts in selected size and quantity (per variant)

Frequently Asked Questions

Q: What is the difference between 304 A2 and 316 A4 thin jam nuts?

A: 316 (A4) stainless steel contains 2–3% molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion. 316 is the correct choice for marine, coastal, food processing, and chemical environments. 304 (A2) is suitable for indoor and general mechanical use. For outdoor or marine applications, always specify 316 A4.

Q: What does A4-70 mean?

A: A4 designates 316 austenitic stainless steel. 70 designates the minimum tensile strength class of 700 MPa. A4-70 is the standard grade for 316 stainless steel fasteners in general and marine applications.

Q: Can I use 316 jam nuts with 304 bolts?

A: Yes. 316 and 304 stainless steel fasteners are dimensionally compatible and can be mixed. However, for maximum corrosion resistance in marine environments, it is best practice to use matching 316 A4 bolts and nuts throughout the assembly.