Adit Turntech / Spec sheet
BPE STD fitting specification.
The standards, dimensions, tolerances, materials and surface finishes every fitting we machine is built and inspected against. Dimensional data follows ASME BPE hygienic tubing tables; where a drawing overrides a standard, the drawing governs.
01 — Standards
Built and inspected to
| ASME BPE | Bioprocessing equipment — dimensions, tolerances, surface finish, material joining |
| ASTM A270 S2 | Sanitary welded and seamless stainless steel tubing |
| ASTM A182 / A479 | Forged fittings and bar stock for pressure and hygienic service |
| ASME B16.5 / B16.9 | Flanges and butt-weld fitting geometry where specified |
| DIN 11851 / DIN 32676 | Metric dairy unions and clamp connections |
| SMS 1145 | Swedish standard hygienic unions |
| ISO 2852 / ISO 1127 | Clamp couplings and metric tube dimensions |
| 3-A Sanitary Standards | Crevice-free hygienic design principles |
| EN 10204 3.1 | Material test certificate issued with every heat |
02 — Dimensions
ASME BPE hygienic tube sizes
| Size | Tube OD (mm) | Wall (mm) | OD tol. (mm) | Clamp flange OD (mm) | Bore (mm) |
|---|---|---|---|---|---|
| 1/2" | 12.70 | 1.65 | ±0.20 | 25.0 | 9.4 |
| 3/4" | 19.05 | 1.65 | ±0.20 | 25.0 | 15.7 |
| 1" | 25.40 | 1.65 | ±0.20 | 50.5 | 22.1 |
| 1 1/2" | 38.10 | 1.65 | ±0.25 | 50.5 | 34.8 |
| 2" | 50.80 | 1.65 | ±0.25 | 64.0 | 47.5 |
| 2 1/2" | 63.50 | 1.65 | ±0.30 | 77.5 | 60.2 |
| 3" | 76.20 | 1.65 | ±0.30 | 91.0 | 72.9 |
| 4" | 101.60 | 2.11 | ±0.30 | 119.0 | 97.4 |
| 6" | 152.40 | 2.77 | ±0.38 | 166.7 | 146.9 |
03 — Tolerances
What we hold in-house
| Turned diameters | Per drawing (±10 µm achievable) |
| Tube OD (per ASME BPE DT-2) | ±0.20 to ±0.38 mm by size |
| Wall thickness | ±10 % of nominal |
| Ferrule flange OD | ±0.25 mm |
| Gasket groove depth / width | ±0.05 mm |
| Face-to-face length, fittings | ±0.8 mm |
| Concentricity, bore to flange | 0.10 mm TIR |
| Face squareness to bore axis | 0.10 mm over flange OD |
| Internal surface waviness | Wa ≤ 1.0 µm on polished bores |
| Thread class | BSP / BSPT to IS 554, NPT to ASME B1.20.1 |
04 — Materials
Materials of construction
SS 316L (UNS S31603)
ASTM A270 S2 / A269 tube, ASTM A182 F316L forgings, ASTM A479 bar
C ≤ 0.035 %, Cr 16–18 %, Ni 10–14 %, Mo 2–3 %
Default for all product-contact parts. Delta ferrite and sulphur controlled per ASME BPE MJ for orbital welding.
SS 304L (UNS S30403)
ASTM A270 tube, ASTM A182 F304L forgings, ASTM A479 bar
C ≤ 0.035 %, Cr 18–20 %, Ni 8–12 %
Used for non-product-contact and utility lines on request.
Elastomers (customer supplied or sourced)
USP Class VI / FDA 21 CFR 177
EPDM, silicone, PTFE, PTFE-envelope
Gaskets and seals are supplied loose against your specification.
05 — Finishes
ASME BPE surface finish designations
| Code | Max Ra | Method |
|---|---|---|
| SF1 | ≤ 0.51 µm (20 µin) | Mechanically polished |
| SF2 | ≤ 0.64 µm (25 µin) | Mechanically polished |
| SF3 | ≤ 0.76 µm (30 µin) | Mechanically polished |
| SF4 | ≤ 0.51 µm (20 µin) | Mechanically polished + electropolished |
| SF5 | ≤ 0.64 µm (25 µin) | Mechanically polished + electropolished |
| SF6 | ≤ 0.76 µm (30 µin) | Mechanically polished + electropolished |
06 — Documentation
Supplied with your order
- ISO 9001:2015 certified quality system (certificate DD4F0051, Ranalysis Certification Pvt. Ltd.)
- EN 10204 3.1 material test certificate, heat traceable
- Dimensional inspection report against ASME BPE tables
- Surface roughness (Ra) report on polished bores
- Passivation / electropolishing certificate
- Positive material identification (PMI) on request
- Hydro or pneumatic pressure test report on request
- Boroscope inspection images for orbital-welded assemblies
07 — Commercial
Ordering terms
| Pricing | Price on request |
| Quotation basis | Quoted per drawing, size, material grade, surface finish and quantity — ex-works Bhosari, Pune. GST extra. |
| Minimum order | 25 pieces per size; single pieces accepted for prototypes |
| Lead time | 7–15 working days from drawing approval |
| Payment | 50 % advance, balance against dispatch, or as agreed |
Send your drawing, get a price.
Tell us size, grade, finish and quantity. We quote against this specification and confirm lead time the same week.
