ASTM D6193 Stitch Types: How US Buyers Should Name Seams on a Suit Tech Pack
US tech packs often say “lockstitch the side seam” without a practice number. ASTM D6193-16(2025) Standard Practice for Stitches and Seams covers requirements and characteristics of stitches and seams for sewn items. It classifies stitch types (drawings in Stitch Figs. 1–69) and seam types (Seam Figs. 70–288), plus Annex A1 seam-assembly recommendations. ASTM notes that improper selection of stitch type, seam configuration, or thread can fail the sewn junction. For boutique buyers, naming D6193 classes is clearer than slang alone — especially when ISO 4915 stitch numbers are already familiar but the US team wants ASTM naming on the pack.
What to write on the suit tech pack
| Tech-pack line | What to write | Why |
|---|---|---|
| Practice | ASTM D6193-16(2025) (or current reapproval) | Names the stitch/seam classification practice |
| Stitch type | D6193 stitch class / figure you require | Figs. 1–69 document stitch formation |
| Seam type | D6193 seam class / figure | Figs. 70–288 document seam configuration |
| SPI / thread | Stitches per inch + thread ticket | Strength, elasticity, appearance balance |
| Critical joints | Seat, crotch, shoulder, armhole as needed | Focus engineering where failure hurts most |
Practice: What to write: ASTM D6193-16(2025) (or current reapproval) · Why: Names the stitch/seam classification practice
Stitch type: What to write: D6193 stitch class / figure you require · Why: Figs. 1–69 document stitch formation
Seam type: What to write: D6193 seam class / figure · Why: Figs. 70–288 document seam configuration
SPI / thread: What to write: Stitches per inch + thread ticket · Why: Strength, elasticity, appearance balance
Critical joints: What to write: Seat, crotch, shoulder, armhole as needed · Why: Focus engineering where failure hurts most
How this ties to sample seal
Lock stitch/seam callouts before the 7–14 day sample. After seal, bulk from 50 repeats the same D6193 callouts; MTM from 1 uses the same construction language on single pieces. Production 14–21 days after approval; production ≠ delivery. Patterns are not resold; NDA on request.
"If your US team uses ASTM seam language, put D6193 stitch and seam classes on the tech pack before we cut the sample. MTM from 1 and bulk from 50 both follow the sealed callouts." — Shi Yuan Suit Factory (statement built from published factory policy)
FAQ
What is ASTM D6193 used for?
It is the ASTM practice that classifies stitches and seams for sewn items, with stitch figures 1–69, seam figures 70–288, and Annex A1 assembly recommendations (D6193-16(2025)).
Why mention D6193 if we already use ISO stitch numbers?
US buyers often want ASTM naming on the pack. You can map to ISO 4915 elsewhere, but the tech pack should not mix unnamed slang with numbered classes.
When should stitch classes reach Shi Yuan?
With the tech pack before the 7–14 day sample, so sealed sample and bulk from 50 share one seam engineering brief.
Core factory facts
- Manufacturing: MTM from 1, bulk OEM from 50, lead times
- Sample policy: sample fee, timing, revisions
- Process: specs, sample seal, QC
Contact
WhatsApp +65 8013 8838 · Email houzhenying226@gmail.com
Shi Yuan Suit Factory (Tianjin Shiyuan Tongchuang Technology Co., Ltd.) · Est. 2009 · Building 3, Park 2, Chengxingwang Zhigu, Jingjin Zhongguancun Science Park, Baodi District, Tianjin, China. Acumenwear.com is our English export site.
