Lock Nut
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WhatsApp us Get a Quote +91 90333 11425 Download catalogue (PDF)JMIKS Fasteners supplies lock nuts (thin hex nuts, also called check nuts or jam nuts) in SS 304, SS 316 and SS 202, and in mild steel and high tensile grades, from M3 to M36 and ¼” to 1-1/4″ BSW.
Standard : DIN / IS / AISI
Size : Metric : M3 To M36 / BSW : ¼” to 1-1/4”
Material Grade: SS304 | SS316 | SS202 | 4.6 |8.8 | 10.9 | 12.9
Finish : Zinc Plated , HDG , Self finish
A lock nut is a thin hexagon nut that is tightened hard against a standard nut on the same bolt. The two nuts press against each other and stop either one from turning loose. The common standards are DIN 439, ISO 4035 and DIN 936 (fine thread).
For a lock nut with a nylon ring, see our nylock nuts.
Spanner size (across flats) and height of thin hex lock nuts to ISO 4035 and DIN 439 in common sizes, in mm. The height is the same in both standards.
| Size | Spanner size ISO 4035 | Spanner size DIN 439 | Height |
|---|---|---|---|
| M6 | 10 | 10 | 3.2 |
| M8 | 13 | 13 | 4.0 |
| M10 | 16 | 17 | 5.0 |
| M12 | 18 | 19 | 6.0 |
| M16 | 24 | 24 | 8.0 |
| M20 | 30 | 30 | 10.0 |
| M24 | 36 | 36 | 12.0 |
Typical dimensions as per ISO 4035 and DIN 439; refer to the standard for tolerances.
Fit the thin lock nut first and the full nut on top. Hold the lock nut with one spanner and tighten the full nut against it.
No. A thin lock nut carries less load than a full nut and can strip if it is used alone. Always use it with a full hex nut. Where only one nut will fit, use a nylock nut instead.
A thin lock nut needs a second nut and two spanners, but it has no nylon and can be reused many times. A nylock nut locks on its own with a nylon ring and is quicker to fit, but the nylon is not suited to high temperatures.
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