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| Customization: | Available |
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| Material: | Stainless Steel |
| Type: | Round Head |
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| Stainless Steel Slotted Head Knurled Thumb Screw | |
| Material: | Carbon Steel, Stainless Steel, Brass etc. |
| Standards: | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC |
| Size: | M1-M10 or non-standard as request & design |
| Finish: | Plain, Black, Zinc, Yellow Zinc, HDG, Geomet, Dacromet, etc. |
| Thread Size d |
M1 | M1.2 | M1.4 | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | |
| P | Pitch | 0.25 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| a | max | 0.75 | 0.75 | 0.9 | 1.05 | 1.2 | 1.35 | 1.5 | 2.1 | 2.4 | 3 | 3.75 | 4.5 |
| c | - | - | - | - | - | 0.3 | 0.3 | 0.4 | 0.4 | 0.5 | 0.6 | 0.8 | |
| dk | Nominal Size | 5.5 | 6 | 7 | 7.5 | 9 | 11 | 12 | 16 | 20 | 24 | 30 | 36 |
| max | 5.74 | 6.24 | 7.29 | 7.79 | 9.29 | 11.35 | 12.35 | 16.35 | 20.42 | 24.42 | 30.42 | 36.5 | |
| min | 5.26 | 5.76 | 6.71 | 7.29 | 8.71 | 10.65 | 11.65 | 15.65 | 19.58 | 23.58 | 29.58 | 35.5 | |
| ds | max=nominal size | - | - | - | - | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| min | - | - | - | - | 1.86 | 2.36 | 2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | |
| e | - | - | - | - | 1.5 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | |
| k | max | 1.5 | 1.5 | 2 | 2 | 2 | 2.5 | 2.5 | 3.5 | 4 | 5 | 6 | 8 |
| min | 1.25 | 1.25 | 1.75 | 1.75 | 1.75 | 2.25 | 2.25 | 3.2 | 3.7 | 4.7 | 5.7 | 7.64 | |
| r | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 2 | 2 | |
| Knurled pitch | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | |
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| Q1: What types of screws do you manufacture? |
| A1: We produce a full range of industrial screws including self-tapping screws, self-drilling screws, machine screws, wood screws, drywall screws, concrete screws, and customized non-standard screws. |
| Q2: What materials are available for your screws? |
| A2: Our screws are available in carbon steel (C1022, C1018), stainless steel (A2/304, A4/316), hardened steel, alloy steel, and brass. Material selection depends on tensile strength and corrosion-resistance requirements. |
| Q3: Do you provide samples before mass production? |
| A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order. |
| Q4: How do you control product quality? |
| A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards. |
| Q5: Do you offer OEM or customized production? |
| A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling. |
| Q6: What is the tolerance and precision level of your threads? |
| A6: We use automated thread rolling with precision tooling. Thread tolerance typically meets 6g / 6H and can be customized for special fitting requirements. |
| Q7: Will stainless steel bolts rust over time? |
| A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection. |
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