Self-Clinching Nuts

Product detail · Updated 10 October 2026

Product and application brief

A self-clinching nut adds a female mating thread to a metal sheet through a pressed-in retaining feature. For the ordinary profile, displaced sheet material enters an undercut and a serrated ring resists rotation in the panel. Identify the receiving sheet and installation geometry as well as the screw thread: a thread size alone does not define a compatible nut. This page compares structures for procurement enquiries, not a promise of tested joint performance.

Product forms and reference names

Choice or field	What to identify
Standard-profile through-thread nut	PennEngineering S/SS/CLS/CLSS/SP catalogue examples use an undercut and serrated clinching ring. Body material and intended receiving-sheet conditions differ between codes; they are not interchangeable solely because the threads match.
Blind-thread nut	B/BS catalogue examples have a closed thread end, separating the screw from the space behind it. Specify usable thread depth and screw intrusion allowance; a closed end is not a certified fluid seal.
Flush nut	F/F4 reference families address a smooth sheet surface. The F4 description identifies a hexagonal head and round receiving hole, with both faces flat after correct installation. This is different from merely calling an ordinary round nut low-profile.
Floating nut	AS/AC/A4 reference families retain a nut with controlled lateral movement for mating-hole misalignment. The retainer is fixed to the sheet; the threaded element has the specified float. Locking and non-locking versions must be distinguished.
Thread-locking clinch nut	LK/LKS/LKA are all-metal flexing-jaw reference examples; other locking families use different features. Choose the mating-thread locking mechanism separately from the clinching retention. No generic prevailing torque or reuse guarantee follows from this name.

Clinch retention is not screw locking

The sheet-retention interface and the screw-thread interface do different jobs. An ordinary serrated clinching ring restrains the nut body in the sheet; it does not by itself make the mating thread a prevailing-torque locknut. PennEngineering separately describes all-metal, nylon-insert and free-running locking designs. Ask for the specified locking construction and acceptance method instead of treating every press nut as an anti-loosening device.

Blind, flush and floating describe different interfaces

Blind describes the closed thread end, not one-sided installation like a blind rivet nut. Confirm screw length against usable thread depth without bottoming. Flush describes the installed surface requirement: specify which sheet faces must remain clear, then check the selected code's profile and thickness range. Floating describes alignment movement inside a retainer, not permission to use an oversized mounting hole. These names should be read as separate selection criteria, not assumed to be available in every combination.

Receiving sheet and installation must be selected together

Manufacturer records pair individual codes with receiving-sheet hardness, sheet thickness, hole size and edge distance. Specify the sheet alloy/grade and actual condition, not just 'steel' or 'stainless'. The nut's material label alone does not establish suitability for a stainless receiving panel. Installation requires the selected prepared hole, orientation and supported squeeze tooling. Obtain the exact maker drawing and method before defining punch/anvil geometry or press settings; no universal hole tolerance or installation force is stated here.

Reference codes are not a universal standard

The S, CLS, SP, B, F4, AS and LK names above identify specific manufacturer families for structure comparison. This page does not establish a universal DIN/ISO interchange standard, brand affiliation or FastenerBridge compliance with those codes. Any catalogue NASM correspondence, thread class, coating or test result belongs to its exact referenced product and conditions. For an enquiry, provide a required original part number or a controlled drawing with its revision and expressly allowed substitutions.

Specification fields

Choice or field	What to identify
Requested structure and interface	Standard profile, closed end, flush faces, float directions/range and separately specified screw-locking mechanism; identify which features are essential.
Mating thread and screw	Thread system, diameter/pitch, fit requirement, screw length and engagement; closed-end usable depth and bottoming clearance where relevant.
Receiving panel	Sheet grade/alloy, hardness/condition, thickness, coating and process stage, hole position and clearance to edges or bends; selected code's limits require confirmation.
Receiving-hole drawing	Diameter/tolerance and permitted edge preparation from the selected specification, manufacturing method, orientation and positional requirements; do not infer hole size from thread diameter.
Part definition	Original maker code or controlled drawing/revision, shank/profile and material/finish requirements; no automatic interchange or availability claim.
Installation access and support	Press access to both sides, tooling support and seating direction, selected procedure and inspection access; qualify the actual panel/fastener/tool combination.
Installed acceptance	Specified seating/flushness, thread gauge and screw fit, panel distortion, and agreed pushout/torque-out or locking tests when required. Test method, values and sample conditions must be separately agreed.
Procurement information	Quantity, packaging, traceability and requested documents; actual manufacture, conformity, stock and delivery require confirmation.

Common product questions

Is a blind clinch nut installed from one side?

Blind here means a closed thread end. The referenced B/BS method uses squeezing between parallel surfaces. Do not substitute it for a blind rivet nut merely because both names contain 'blind'; check actual installation access.

Does a floating nut automatically lock the screw?

No. The referenced floating family distinguishes locking and non-locking versions. Lateral alignment movement and mating-thread locking are separate requirements.

Can one hole drawing serve every nut with the same thread?

Not assumed. Compare the selected code's shank, sheet thickness/hardness and receiving-hole requirements. Confirm a replacement against the controlled panel and installation method.

What must be confirmed before ordering?

The exact code or drawing, receiving-sheet data, essential structure, mating thread/screw, hole and edge requirements, installation access and acceptance criteria. Loads, torque, approvals, reuse, temperature, production capability, stock and delivery remain unverified until separately confirmed.

Product references

References checked 10 October 2026 identify structures, not FastenerBridge stock, certification or brand affiliation. Final requirements follow the selected specification. No universal dimensions, load rating or tightening torque is stated.