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Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

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Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

Brand Name : YB

Model Number : Screws with washer

Certification : ISO9001

Place of Origin : China

MOQ : 10000

Price : Negotiation

Payment Terms : T/T

Supply Ability : 500Tons/month

Delivery Time : 7-25Days

Packaging Details : Carton Box/Pallet/Customized

Standard : DIN,ISO,JIS,ANSI,BS

Material : Stainless Steel,etc.,copper,carbon steel,Brass

Size : M3-M8

Finish : Zinc Plated

Port : NingBo or ShangHai

Surface treatment : Plain,zinc plated,nickel plated,Chrome,passivation

Application : transportation,Electric,military inductry etc,Wooden Products,Cabinet& furniture&hardware

Color : Blue and White

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Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

1.Products Details:

This assembly is a pre-configured fastening solution combining three components:
1. Cross Recessed Hexagon Head Bolt: Features a hexagonal shank for wrench tightening and a cross-shaped recess (Phillips drive) for screwdriver compatibility, offering dual-tool accessibility.
2. Spring Washer: A helical washer that provides tension and vibration resistance, preventing loosening under dynamic loads.
3. Flat Washer: A thin circular washer placed between the bolt head and the surface, distributing pressure evenly and protecting the material from damage.

2.Key Features:

- Saves time by eliminating separate component handling during installation.
- Spring washer reduces loosening in high-vibration environments (e.g., automotive, industrial machinery).
- Flat washer prevents bolt head indentation on soft materials (e.g., wood, aluminum).
- Hex head + cross recess allow flexibility in installation tools.

3.Technical Parameters of Hex Bolt with lock and plain washer

Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

d		M4	M5	M6	M8
a	MAX	1.4	1.6	2	2.5
b	MIN	38	38	38	38
h		0.8	1	1.6	1.6
H		2.75	3.25	4	5
dc		9	10	12	16
d2		6.78	8.75	10.71	13.64

4.Certificate Display

Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

5.Production Process

Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

6.Packaging and shipping Details

Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated Images

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