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Lock Nuts

Lock Nuts, Locking Nuts or Jam Nuts come in various forms as shown below, other types include Prevailing Torque Nut and All Metal Locking Nut. Traditionally a Lock Nut is a DIN 439 Half Nut which are used in pairs to create a locking mechanism, but today we have many other options. Lock Nuts containing a nylon collar which elastically deforms when a threaded fastener is inserted, causing a frictional locking action, are very popular. Referred to as Nyloc nuts we have several variants in Metric and Imperial sizes. Also stocked are All Metal Locking Nuts where again a collared section, this time made of metal but slightly smaller in diameter to the rest of the nut, deforms as the nut is tightened. Where vibration to the bolted connection is likely to cause loosening, a lock nut is the simplest and most effective solution.

Material Key
A2	A2 Stainless Steel - also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4	A4 Stainless Steel - also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
BRASS	Brass - offers an attractive, corrosion resistant finish.
BZP	Bright Zinc Plated (BZP) Steel - non-stainless standard steel grade offering a basic level of corrosion resistance.
BZP-10	Bright Zinc Plated (BZP) high tensile steel class 10 - a higher tensile non-stainless grade for nuts, with a basic level of corrosion resistance.
BZP-8	Bright Zinc Plated (BZP) high tensile steel class 8 - the general purpose non-stainless grade for nuts, offering a basic level of corrosion resistance.

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Thin Nyloc Nuts (Type T) ISO 10511 (DIN 985)

Prevailing torque type nut manufactured to DIN 985. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. This is the standard profile variant (Type T), a higher profile option is available under DIN 982 (Type P). Typically fitted with a spanner or ratchet with socket.

BRASS

BZP-10

BZP-8

Thick Nyloc Nuts (Type P) ISO 10512 (DIN 982)

Prevailing torque type nut manufactured to DIN 982. Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. This is the higher profile (Type P) variant with more available thread engagement and is typically fitted with a spanner or ratchet with socket. A lower profile, where perhaps space is at a premium is also available under DIN 985 (Type T).

BZP-8

Half Nuts (Lock Nut) Coarse Pitch ISO 4035 (DIN 439 part 2)

Nut conforming to DIN 439. Also known as a half nut, thin nut, or jam/lock nut. Typically fitted with a spanner or ratchet with socket, often used in pairs or in conjunction with a hexagon full nut in a locking arrangement. A popular nut type, and used for decades on all types of assembly throughout the world. Fine Pitch and Left Hand Thread variants are also available immediately below this item.

BZP

UNC Aerotight All Metal Locking Nuts

Slotted or split beam type hexagon all metal locking nut with UNC Thread form . Manufactured in the UK with the Aerotight trademark. Undersize threaded sections on top portion of nut mean that when tightened into position the undersize section is forced outward creating high friction and a more secure 'locked' fitment. A locking nut for use in higher temperatures where a locking nylon ring nut would be unsuitable.

4-40

6-32

10-24

5/16

Aerotight All Metal Locking Nuts

Slotted or split beam type hexagon all metal locking nut . Manufactured in the UK with the Aerotight trademark. Undersize threaded sections on top portion of nut mean that when tightened into position the undersize section is forced outward creating high friction and a more secure 'locked' fitment. A locking nut for use in higher temperatures where a locking nylon ring nut would be unsuitable.

Square Thin Nuts

A thin or half nut variation of the standard DIN 557 square nut. To DIN 562.

Dome Nyloc Nuts DIN 986

A prevailing torque type locking version sharing the characteristics of the DIN 1587 dome nut. Incorporating a nylon insert to help prevent loosening when fitted. Conforms to DIN 986.

Stover Nuts

An elliptical offset type hexagon locking nut. Of all metal construction, and can be reused indefinitely. A locking nut for use in higher temperatures where a locking nylon ring nut would be unsuitable.

BZP-8

Hex Serrated Flange Nuts with Nylon Insert

A prevailing torque type hexagon nut incorporating a flange and nylon insert to help prevent loosening when fitted. This particular version has serrations on the base of the flange. A non-serrated version is also available. Manufactured to DIN 6926.

Castle Nuts DIN 935

A slotted, castellated or castle nut gets its name from the slot's resemblance to the crenellations of a typical castle. These nuts are usually paired with a split pin or R-clip to form a positive locking device.

Hex Plain (Non-Serrated) Flange Nuts with Nylon Insert

A prevailing torque type hexagon nut incorporating a flange and nylon insert to help prevent loosening when fitted. This particular version is non-serrated on the base of the flange. A serrated version is also available. Manufactured to DIN 6926.

BZP-8

UNC Nylon Insert Hex Nuts IFI-100/107

Prevailing torque type nut manufactured to IFI-100/107. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. Typically fitted with a spanner or ratchet with socket.

BZP

4-40

6-32

8-32

10-24

5/16

7/16

9/16

UNF Nylon Insert Hex Nuts IFI-100/107

BZP

10-32

5/16

7/16

9/16

UNC Half Nuts (Lock Nut) ASME B18. 2.2

Nut conforming to ASME B18.2.2. Also known as a half nut, thin nut, or jam nut. Typically fitted with a spanner or ratchet with socket, often used in pairs in a nut locking arrangement. A popular nut type, and used for decades on all types of assembly throughout the world.

BZP

5/16

7/16

UNF Half Nuts (Lock Nut) ASME B18. 2.2

BZP

5/16

7/16

9/16

UNC Nylon Insert Hex Nuts Thin Type

Prevailing torque nut, thin type. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. Typically fitted with a spanner or ratchet with socket.

BZP

4-40

5-40

6-32

8-32

10-24

12-24

5/16

7/16

UNF Nylon Insert Hex Nuts Thin Type

Prevailing torque nut, thin type. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. Typically fitted with a spanner or ratchet with socket.

BZP

4-48

5-44

6-40

8-36

10-32

12-28

5/16

7/16

UNF Aerotight All Metal Locking Nuts

Slotted or split beam type hexagon locking nut, of all metal construction with UNF thread form. Manufactured in the UK with the Aerotight trademark. Undersize threaded sections on top portion of nut mean that when tightened into position the undersize section is forced outward creating high friction and a more secure 'locked' fitment.

5/16

Half Nuts (Lock Nut) With Left Hand Thread

Hexagon thin, jam, locking or half nut with standard metric coarse pitch, but with a Left Handed Thread. To DIN 439. Only for use in conjunction with Left Handed Thread bolts or screws.