GB818 Pan Head Cross Recessed Machine Screw

The GB818 Pan Head Cross Recessed Machine Screw manufactured by Wanluo's suppliers is a standard general-purpose precision matching fastener that is specifically designed for medium and light industrial standardized assembly. It is suitable for various scenarios where pre-set threaded holes and nuts are used for locking. Unlike the self-locking structure of pointed self-tapping screws and coarse-threaded wood screws, this product adopts a standard metric fine-tooth design without cutting pointed tips. It achieves stable locking through precise thread engagement and features three core advantages: precise matching, repeated disassembly, and smooth assembly.

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Product Description

The GB818 Pan Head Cross Recessed Machine Screw manufactured by Wanluo Factory is produced through an integrated cold forging process, combined with a secondary precision rolling thread process. The entire tooth profile is regular and the tolerance is precise, effectively resolving common assembly problems such as misaligned threads, assembly jams, uneven board surfaces, and rough appearance of ordinary counterfeit screws. The rounded arc-shaped head has no sharp edges, and after installation, it is neat and beautiful, suitable for batch standardized assembly of electronic devices, household appliances, precision instruments, and daily industrial equipment. It is the most versatile basic machine screw for light industrial assembly scenarios.

Material Advantages

1. Uniform overall hardness, suitable for repeated assembly and disassembly conditions.

2. Excellent tensile and fatigue resistance,不易 loosen or deform.

3. Corrosion-resistant and rust-proof， suitable for various common working conditions.

4. Fine surface treatment, higher assembly appearance quality.

5. Standard material ratio, full compatibility and versatility.

Maintenance and Care Instructions

1. Daily Visual Inspection

Regularly inspect the surface condition of GB818 Pan Head Cross Recessed Machine Screw. Focus on checking for issues such as accumulated dirt, slight oxidation, and dust accumulation on the threads. Clean the surface impurities promptly to prevent foreign substances from adhering and wearing down the thread profile over time, ensuring the accuracy of engagement.

2. Standard Assembly and Disassembly, Avoid Violent Operations

When disassembling or assembling, use matching cross tools of the corresponding specifications. Apply force evenly and steadily. Avoid violent twisting or forced pulling. Prevent the tool from slipping and wearing the cross slot or damaging the threads. Avoid causing the screws to become stuck or fail to disassemble due to human factors.

3. Environmental Condition Division for Maintenance

In humid and poorly ventilated working conditions, perform simple rust prevention maintenance regularly. Simply wipe with protective oil to isolate moisture. In dry indoor environments, no complex maintenance is required. Just keep the assembly clean. This is suitable for long-term stable use.

4. Regular Tightening and Re-inspection

For assembly points of equipment with slight vibrations, re-inspect the locking status at regular intervals. Make timely adjustments and reinforcement to prevent long-term minor vibrations from causing slight loosening of the screws, ensuring the stability of the equipment assembly.

5. Classification Storage of Spare Parts

Spare screws should be stored in a dry and ventilated environment. Avoid long-term exposure to the elements, contact with acidic or alkaline media, and prevent premature oxidation and rusting. Ensure the assembly accuracy and performance of the spare screws.

Product Parameter

Parameter Item	Detailed Specification
Product Name	GB818 Pan Head Cross Recessed Machine Screw, Metric Round Head Machine Bolt
Executive Standard	GB818, ISO Standard, Cross Reference DIN/ANSI Standard
Available Material	304, 316, 316L Stainless Steel, Carbon Steel Zinc-plated
Size Range	M1.6-M12 full standard metric sizes, custom non-standard length available
Head Type	Smooth round pan head, low-profile decorative fastening head
Drive Type	Standard cross recess, compatible with universal assembly tools
Thread Feature	Fine and uniform full metric thread, high matching precision
Surface Treatment	Pickling & passivation, polished burr-free surface, anti-rust and anti-corrosion
Mechanical Properties	High tensile strength, stable locking force, anti-fatigue and reusable
Packaging Method	Moisture-proof inner packaging + export carton, pallet packing for bulk orders
Supply Service	Spot bulk supply, non-standard customization, mixed fastener one-stop procurement

Gb818 Pan Head Cross Recessed Machine Screw

Thread Size d			M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	M8	M10
P	Pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1.25	1.5
a	max		0.7	0.8	0.9	1	1.2	1.4	1.6	2	2.5	3
d_a	Penetration depth		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	9.2	11.2
d_k	max=nominal size		3.2	4.0	5.0	5.6	7.00	8.00	9.50	12.00	16.00	20.00
d_k	min		2.9	3.7	4.7	5.3	6.64	7.64	9.14	11.57	15.57	19.48
k	max=nominal size		1.30	1.60	2.10	2.40	2.60	3.10	3.70	4.6	6.0	7.50
k	min		1.16	1.46	1.96	2.26	2.46	2.92	3.52	4.3	5.7	7.14
r	min		0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.4	0.4
R	≈		2.5	3.2	4	5	6	6.5	8	10	13	16
x	max		0.9	1	1.1	1.25	1.5	1.75	2	2.5	3.2	3.8
Socket No.			0	0	1	1	2	2	2	3	4	4
M₁	Type H	Ref.	1.7	1.9	2.7	3	3.9	4.4	4.9	6.9	9	10.1
Penetration depth		max	0.95	1.2	1.55	1.8	1.9	2.4	2.9	3.6	4.6	5.8
Penetration depth		min	0.7	0.9	1.15	1.4	1.4	1.9	2.4	3.1	4	5.2
M₂	Type Z	Ref.	1.6	2.1	2.6	2.8	3.9	4.3	4.7	6.7	8.8	9.9
Penetration depth		max	0.9	1.42	1.5	1.75	1.93	2.34	2.74	3.46	4.5	5.69
Penetration depth		min	0.65	1.17	1.25	1.5	1.48	1.89	2.29	3.03	4.05	5.24