ISO 7380 Button Head Socket Cap Screw Grade 10.9 Nickel Plated

FULLERKREG ISO 7380-1 / GB70.2 Grade 10.9 Nickel Plated Button Head Socket Cap Screws

FULLERKREG ISO 7380-1 / GB70.2 Grade 10.9 Nickel Plated Button Head Socket Cap Screws are high-strength fasteners featuring a low-profile dome-shaped button head with a hexagon socket drive. Manufactured from 10B21 boron-alloyed steel with an electroplated nickel (Ni) surface finish, these screws deliver Grade 10.9 tensile strength (min. 1,040 MPa) with a bright silver appearance that closely resembles passivated stainless steel. The nickel plating provides excellent corrosion resistance, a clean professional finish, and is widely preferred in the automation, robotics, and precision equipment industries where both high strength and a stainless-like appearance are required without the cost of stainless steel fasteners.

Product Specifications

• Standards: ISO 7380-1 / GB 70.2
• Strength Grade: 10.9 (heat treated)
• Material: 10B21 boron-alloyed steel
• Tensile Strength: Min. 1,040 MPa
• Yield Strength: Min. 940 MPa
• Hardness: HRC 32–39
• Head Type: Button head (low-profile dome)
• Surface Treatment: Electroplated nickel (Ni)
• Plating Thickness: Typically 5–15 μm nickel
• Appearance: Bright silver — similar to passivated stainless steel
• Thread Type: Metric coarse, full thread
• Thread Tolerance: 6g
• Drive Type: Hexagon socket (Allen key / hex key)
• Sizes Available: M3 – M16

Nickel Plating — Why It’s Preferred in Automation & Robotics

Nickel-plated Grade 10.9 button head screws occupy a unique position in the fastener market — combining the high strength of alloy steel with the clean silver appearance of stainless steel. This makes them the preferred choice in automation and precision equipment industries for several reasons:

• Stainless-like appearance — bright silver finish is visually indistinguishable from passivated A2/A4 stainless steel in most applications
• Higher strength than stainless — Grade 10.9 (1,040 MPa) significantly exceeds A2-70 stainless (700 MPa), enabling smaller fastener sizes for the same clamping force
• Better corrosion resistance than black oxide — nickel plating provides a dense, uniform barrier coating superior to black oxide
• Non-galling — nickel surface reduces friction and galling risk during assembly in precision equipment
• Clean room compatible — smooth nickel surface does not shed particles, suitable for semiconductor and precision manufacturing environments
• Cost-effective vs. stainless — achieves stainless appearance at lower material cost with superior mechanical properties

Surface Finish Comparison — Nickel vs Other Common Finishes

Property	Nickel (Ni) — This Page	Zinc CR3	Black Oxide	A2 Stainless (ref.)
Appearance	Bright silver	Bright silver	Matte black	Natural silver
Coating thickness	5–15 μm	5–12 μm	1–2 μm	N/A (base material)
Corrosion resistance	Very good	Good	Moderate	Excellent
Salt spray resistance	120–200+ hrs	72–120 hrs	Low (without oil)	Excellent
Tensile strength (Grade 10.9)	1,040 MPa	1,040 MPa	1,040 MPa	700 MPa (A2-70)
Appearance vs stainless	Very similar	Similar	Different	Identical
Preferred industry	Automation, robotics, precision equipment	Electronics, automotive	General industrial	Food, marine, medical
RoHS compliance	✅ Compliant	✅ Compliant	✅ Compliant	✅ Compliant

Material — 10B21 Boron Steel Chemical Composition (%)

FULLERKREG ISO 7380-1 Grade 10.9 Nickel Plated button head screws are manufactured from 10B21 boron-alloyed steel. The addition of boron (B) significantly improves hardenability, enabling Grade 10.9 mechanical properties with a leaner alloy composition. All values are maximum unless a range is indicated.

Grade	C	Si (max)	Mn	P (max)	S (max)	B
10B21	0.18–0.23	≤0.30	0.80–1.10	≤0.030	≤0.030	0.0005–0.003

Mechanical Properties — Grade 10.9 (ISO 898-1)

Property	Requirement	Unit
Tensile Strength (Rm)	Min. 1,040	MPa
Yield Strength / Proof Load Stress (Rp0.2)	Min. 940	MPa
Core Hardness	32–39	HRC
Surface Hardness (max)	≤44	HRC
Elongation after fracture (A)	Min. 9	%
Reduction of area (Z)	Min. 48	%
Impact energy (KV) at room temp.	Min. 37	J
Thread Tolerance Class	6g	—
Surface Treatment	Electroplated nickel (Ni)	—

Key Features

• Stainless-like silver appearance — bright nickel finish closely resembles passivated stainless steel, preferred in automation and precision equipment for aesthetic consistency
• Grade 10.9 high strength — 1,040 MPa tensile strength, 49% stronger than A2-70 stainless steel (700 MPa)
• Low-profile button head — smooth dome design, approximately 50% lower than standard socket cap screws (DIN 912)
• Superior corrosion resistance — nickel plating provides 120–200+ hours salt spray resistance, better than zinc or black oxide
• Non-galling surface — smooth nickel reduces friction during assembly in precision equipment
• 10B21 boron steel — excellent hardenability and consistent mechanical properties through heat treatment
• RoHS & REACH compliant — nickel plating process free from restricted hazardous substances
• ISO 7380-1 / GB 70.2 dual standard — suitable for both international and Chinese domestic supply chains

Applications

FULLERKREG ISO 7380-1 Grade 10.9 Nickel Plated button head socket cap screws are the preferred choice in:

• Industrial automation and robotics — high strength + stainless appearance for professional equipment builds
• Semiconductor and precision manufacturing equipment — clean, non-particle-shedding surface
• CNC machines and machining centers
• Medical device manufacturing equipment — clean silver appearance meets aesthetic requirements
• Optical and photonics equipment
• Laboratory instruments and scientific equipment
• High-end consumer electronics assembly equipment
• Any application requiring Grade 10.9 strength with a stainless-like silver appearance

Dimensional Specifications — ISO 7380-1 (Unit: mm)

Thread (d)	Pitch (p)	Head Dia. dk Max.	Head Dia. dk Min.	Head Height k Max.	Head Height k Min.	Key Size s	Key Depth t Min.	Body Dia. ds Max.	Body Dia. ds Min.
M3	0.5	5.70	5.50	1.65	1.35	2.0	0.74	3.00	2.86
M4	0.7	7.60	7.36	2.20	1.80	2.5	1.05	4.00	3.82
M5	0.8	9.50	9.22	2.75	2.25	3.0	1.35	5.00	4.82
M6	1.0	10.50	10.22	3.30	2.70	4.0	1.60	6.00	5.82
M8	1.25	14.00	13.57	4.40	3.60	5.0	2.20	8.00	7.78
M10	1.5	17.50	17.05	5.50	4.50	6.0	2.75	10.00	9.78
M12	1.75	21.00	20.48	6.60	5.40	8.0	3.30	12.00	11.73
M16	2.0	28.00	27.48	8.80	7.20	10.0	4.40	16.00	15.73

Frequently Asked Questions

Q: How does nickel plating compare to passivated stainless steel in appearance?
Nickel plating produces a bright, uniform silver finish that is visually very similar to passivated A2 or A4 stainless steel. In most automation and equipment applications, the two are visually indistinguishable, making nickel-plated Grade 10.9 screws an ideal substitute where stainless steel strength is insufficient.

Q: Is nickel plating RoHS compliant?
Yes. Standard electroplated nickel does not contain hexavalent chromium (Cr6+), lead, mercury, cadmium, or other RoHS restricted substances. FULLERKREG nickel-plated fasteners are RoHS and REACH compliant.

Q: Can Grade 10.9 button head screws handle the same torque as Grade 10.9 socket cap screws?
No. Due to the shallower socket depth in the button head design, the maximum recommended tightening torque is lower than for standard socket cap screws (DIN 912) of the same grade. Always use ISO 7380-1 specific torque values.

Q: What is GB 70.2?
GB 70.2 is the Chinese national standard for button head socket cap screws, equivalent to ISO 7380-1. These screws comply with both standards and are interchangeable in most applications.

Q: Can I get material certificates and test reports?
Yes. PPAP reports, material certificates, hardness test reports, tensile test reports, and plating thickness reports are available upon request for all FULLERKREG products.

Packaging & Availability

• Standard sizes M3 – M16 available in stock
• Bulk carton packaging; small box and custom packaging available
• Material certificates, plating reports, and RoHS declarations available on request
• PPAP report available on request
• Custom lengths accepted for large orders

Download Specification

• ISO 7380-1 — Full Dimensional Specification (PDF)
• ISO 898-1 — Mechanical Properties of Fasteners (PDF)

Quality Assurance

All FULLERKREG ISO 7380-1 Grade 10.9 Nickel Plated button head socket cap screws are manufactured under strict quality control procedures including:

• Rockwell hardness test (HRC 32–39)
• Tensile strength test (min. 1,040 MPa)
• Salt spray corrosion test (nickel plating)
• Plating thickness inspection (5–15 μm)
• Dimensional inspection per ISO 7380-1
• Chemical composition analysis (10B21, B content verified)
• PPAP documentation available upon request

For wholesale pricing, bulk orders, or technical inquiries, please contact our sales team.