Stainless T-Bolts
| Standard | DIN 186 / 188 ref · OEM |
|---|---|
| Material | SS304 / SS316 |
| Strength Grade | A2-70 / A4-80 |
| Size Range | M6-M16 / OEM T-slot range |
| Surface Treatment | Passivated |
01
Product Description
Product Description & Key Specifications
Stainless T-bolts are supplied in SS304 / SS316 with A2-70 / A4-80 grade options for T-slot rails, channel profiles, solar mounting rails and adjustable bracket systems. Common range is M6-M16, with DIN 186 / DIN 188 references or OEM head geometry and passivated finish.
The T-head is designed to slide into a slot or channel and resist rotation during tightening. Accurate specification requires the thread size, total length, head width, head thickness, neck geometry, slot width and installation direction, because T-slot systems often use proprietary rail dimensions.
SS304 / A2 suits general outdoor mounting systems, while SS316 / A4 is preferred for coastal solar, marine hardware and chloride-exposed service. A4-80 can be requested when higher stainless strength is needed and the selected head geometry is manufacturable.
| Product type | Stainless T-bolts / T-slot bolts |
|---|---|
| Standards | DIN 186 / DIN 188 reference / OEM drawing |
| Material | SS304 / SS316 |
| Strength grade | A2-70 / A4-70 / A4-80 |
| Size range | M6-M16 / OEM T-slot range |
| Common models | M6 x 20, M8 x 25, M8 x 30, M10 x 30, M12 x 40 |
| Head geometry | T-head width, thickness and neck size confirmed by rail slot |
| Surface finish | Passivated stainless surface |
| Documentation | CoC, material certificate and dimensional report on request |
Dimensions & SpecificationsDIN 186
Technical Drawing
Dimensional Table
| Parameter | M6 | M8 | M10 | M12 | M16 | M20 | M24 | M30 | M36 | M42 | M48 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| P | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 |
| ds/max | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 | 24.84 | 30.84 | 37 | 43 | 49 |
| ds/min | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | 23.16 | 29.16 | 35 | 41 | 47 |
| k/max | 4.9 | 5.9 | 7.5 | 8.75 | 11.4 | 13.9 | 15.9 | 20 | 24 | 27 | 31 |
| k/min | 4.1 | 5.1 | 6.5 | 7.75 | 9.6 | 12.1 | 14.1 | 18 | 22 | 25 | 29 |
| s2/max | 6.6 | 8.75 | 10.75 | 12.9 | 16.9 | 21 | 25 | 31 | 37.25 | 43.25 | 49.25 |
| s2/min | 5.4 | 7.25 | 9.25 | 11.1 | 15.1 | 19 | 23 | 29 | 34.75 | 40.75 | 46.75 |
| s1/max | 16.9 | 18.9 | 22 | 27 | 31 | 37.25 | 44.25 | 55.5 | 67.5 | 81.5 | 89.75 |
| s1/min | 15.1 | 17.1 | 20 | 25 | 29 | 34.75 | 41.75 | 52.5 | 64.5 | 78.5 | 86.25 |
| r | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 | 1.6 | 1.6 | 2 | 2 | 2 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Solar PV Mounting Rails
M8 stainless T-bolts are commonly used in PV rails, mid clamps, end clamps and adjustable roof brackets. SS304 / A2 suits general outdoor systems; SS316 / A4 is preferred near coastal exposure.
Renewable energy fastenersChannel Profiles & Strut Assemblies
M6, M8, M10 and M12 T-slot bolts support slotted channels, equipment rails and adjustable frames. Confirm slot width and head geometry before ordering because channel systems vary.
Construction fastenersMarine Adjustable Hardware
SS316 / A4 T-bolts can be used for selected marine rails, covers and adjustable brackets where slot geometry is defined and chloride resistance is required.
Marine fastenersEquipment Frames & Modular Fixtures
Passivated stainless T-bolts help with repeated adjustment in modular equipment frames, test fixtures and stainless guide rails. M6 x 20, M8 x 25 and M10 x 30 are common RFQ starting points.
Equipment fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cold forming, hot forging or machining selected by T-head geometryIncoming SS304 / SS316 material verification
Thread rolling and custom head forming by slot requirementThread gauge plus head width, thickness and neck dimension inspection
Passivation and stainless surface finishingTrial fit review against supplied rail or drawing when specified
OEM rail-system bolt productionTensile, hardness or salt-spray tests arranged when specified
Kit packaging with nuts or clamps by orderCoC, MTC and dimensional report prepared on request
05
FAQ
Common Questions Before RFQ
What dimensions are needed for a stainless T-bolt RFQ?
Confirm thread size, length, head width, head thickness, neck size, slot width, material, grade, finish and quantity. For proprietary rails, a drawing or sample is strongly recommended.
Are DIN 186 and DIN 188 T-bolts always interchangeable?
No. DIN references help define T-head bolt styles, but many rail systems use OEM head geometry. Confirm the exact slot and head dimensions before ordering.
Should I choose SS304 or SS316 T-bolts?
SS304 / A2 is suitable for general outdoor assemblies. SS316 / A4 is preferred for coastal solar, marine, washdown or chloride-exposed environments.
What sizes are commonly requested?
Common RFQ models include M6 x 20, M8 x 25, M8 x 30, M10 x 30 and M12 x 40 stainless T-bolts. Head geometry must match the rail slot.
Can T-bolts be supplied with nuts and washers?
Yes. Stainless T-bolts can be supplied alone or with matching stainless nuts, washers or project kits when the assembly requirement is confirmed.
Need stainless T-bolts for rails or channel profiles?
Send your thread size, length, material, grade, rail slot dimensions, head drawing, finish and quantity. Our team can confirm whether standard or OEM stainless T-bolts are suitable.
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